CN1842681A - Refrigeration unit - Google Patents

Abstract

Disclosed is a refrigeration unit comprising an outside air temperature sensor (231) for sensing the outside air temperature and a control means (240) for controlling the operating capacity of a compressor (221) for supercooling. The control means (240) controls the operation of the compressor (221) for supercooling basing on the state of a refrigerant flowing through a refrigerant circuit (20) in a heat exchanger (210) for supercooling and the outside air temperature sensed by the outside air temperature sensor (231).

Description

Refrigerating plant

Technical field

The present invention relates to a kind of refrigerating plant with apparatus for supercooling, this apparatus for supercooling will be delivered to the cold-producing medium supercooling that utilizes the side machine from the heat source side machine.

Background technology

In the past, for example, open shown in the flat 10-185333 communique as the spy, comprise: have supercooling with the 1st refrigerant loop of heat exchanger with have the 2nd refrigerant loop that utilizes side heat exchanger and heat source side compressor, with the 2nd cold-producing medium supercooling of heat exchanger with the 2nd refrigerant loop, the refrigerating plant of seeking to increase refrigerating capacity is well-known by supercooling.

Be the air conditioner of this refrigerating plant, comprise outdoor unit, indoor units and supercooling unit.Specifically, this supercooling unit is set in the way of hydraulic fluid side connecting pipe of outer unit of junction chamber and indoor units, simultaneously, comprises the 1st refrigerant loop (cooling fluid circuit).This supercooling unit constitutes and allows the 1st cold-producing medium circulate in the 1st refrigerant loop to carry out kind of refrigeration cycle, the 2nd refrigerant cools of the air conditioner that will send into from the hydraulic fluid side connecting pipe in heat exchanger in the supercooling of the 1st refrigerant loop.And this supercooling unit hangs down the cold air ability that improves by the enthalpy drop that will deliver to the liquid refrigerant cooling of indoor units from the outdoor unit of air conditioner, and allow the liquid refrigerant of delivering to indoor units.

As mentioned above, above-mentioned supercooling unit is to be used for refrigerating plants such as auxiliary air conditioner machine, increases its refrigerating capacity.Therefore, not in the stopping of refrigerating plant, only do not make the situation of supercooling unit running.And, not having as the heating installation running of air conditioner yet, refrigerating plant makes the situation of supercooling unit running under the state as the heat pump action.Therefore, whether decision should make supercooling unit running, is to wait according to the operating condition of the refrigerating plant that the supercooling unit has been installed and outer temperature degree to judge.

So in above-mentioned air conditioner, the control part of the control part of supercooling unit and air conditioner linked together constitutes a control system.Signal from the control part of air conditioner to the control part input of this supercooling unit that represent the operating condition of air conditioner from.And, in this supercooling unit, carry out its running control according to the signal of importing from the control part of air conditioner.

But, in above-mentioned air conditioner (refrigerating plant) in the past, when load because of outside the rising etc. of temperature degree when increasing, allow the compressor operation capacity increase of the 2nd refrigerant loop usually, guarantee the cold air ability.

But if only allow circulating mass of refrigerant increase in the 2nd bigger refrigerant loop of the height pressure reduction of kind of refrigeration cycle, then the input for compressor increases the phenomenon that causes the coefficient of performance to reduce sometimes.Its result has the problem that the power consumption of whole device obviously increases.

And, when to contract demand when restricted, particularly from summer electrification excessive, want to be limited in very much the total of electric power that uses in the 1st refrigerant loop and the electric power that in the 2nd refrigerant loop, uses.

Summary of the invention

In view of the premises, the objective of the invention is to: by being adjusted in heat source side loop and supercooling balance, allow the whole freezing device more effectively turn round, suppress the power consumption of whole device with running capacity in the loop.

The solution that the present invention studied is as follows.

Specifically, the 1st solution is to be prerequisite with such refrigerating plant, comprise: have the side of utilization heat exchanger (101,111,131) and heat source side compressor (41,42,43), allow cold-producing medium circulate and carry out the refrigerant loop (20) that steam compression type refrigerating circulates; And has supercooling with heat exchanger (210) with will cool off with the fluid conveyance to the cooling fluid circuit (220) of this supercooling with the pump machanism (221) of heat exchanger (210).This refrigerating plant utilization cooling will offer the above-mentioned cold-producing medium of side heat exchanger (101,111,131) that utilizes in above-mentioned supercooling supercooling in the heat exchanger (210) with fluid.

And, comprise controller (240), according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in above-mentioned supercooling or cooling with the cooling of fluid circuit (220) with fluid state and outside the temperature degree reduce the power consumption of said pump mechanism (221).

In above-mentioned solution, cooling with fluid circuit (220) in, utilize pump machanism (221) to offer supercooling usefulness heat exchanger (210) with fluid in order to coolings such as the cold-producing medium of the cold-producing medium of supercooling refrigerant loop (20) and water.Use in the heat exchanger (210) in supercooling, the cold-producing medium of refrigerant loop (20) exchanges with fluid thermal with cooling.And, to use in the heat exchanger (210) in supercooling, cooling is with the cold-producing medium heat absorption of fluid from refrigerant loop (20), with the refrigerant cools of refrigerant loop (20).

In this refrigerating plant (10), controller (240), according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in supercooling or cooling with the cooling of fluid circuit (220) with fluid state and outside the temperature degree, reduce the power consumption of pump machanism (221).That is to say, only carry out the running control of pump machanism (221) according to the information that in cooling off, obtains with fluid circuit (220).Therefore, controller (240) can reduce the power consumption of pump machanism (221) not under the situation of refrigerant loop (20) acceptance about the signal of the operating condition of refrigerant loop (20).

The 2nd solution is on the basis of above-mentioned the 1st solution, above-mentioned controller (240), constitute according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in supercooling or cooling with the cooling of fluid circuit (220) with fluid state and outside the temperature degree, infer power consumption, reduce the power consumption of said pump mechanism (221) about refrigerant loop (20).

In above-mentioned solution, controller (240), according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in supercooling or cooling with the cooling of fluid circuit (220) with fluid state and outside the temperature degree, roughly dope the operating condition of refrigerant loop (20), infer its power consumption.Controller (240) reduces the power consumption of pump machanism (221), so that the power consumption of the refrigerant loop that this quilt is inferred (20) and the total cooled off with the power consumption of the pump machanism (221) of fluid circuit (220) are no more than setting.

The 3rd solution is on the basis of above-mentioned the 1st solution, above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates.

And, above-mentioned controller (240), constitute according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in above-mentioned supercooling or supercooling with the supercooling of refrigerant loop (220) with refrigerant condition and outside the temperature degree, reduce the operating frequency of above-mentioned supercooling, reduce the power consumption of this supercooling with compressor (221) with compressor (221).

In above-mentioned solution, use in the refrigerant loop (220) in supercooling, repeat such circulation: from supercooling with compressor (221) ejection supercooling with cold-producing medium heat source side heat exchanger (222) for example with air heat exchange, then, supercooling with heat exchanger (210) in the cold-producing medium heat exchange of refrigerant loop (20), turn back to supercooling again with compressor (221).Use in the heat exchanger (210) in supercooling, supercooling is with cold-producing medium heat absorption and the evaporation of cold-producing medium from refrigerant loop (20), with the refrigerant cools of refrigerant loop (20).

And, controller (240), be not subjected to the signal of relevant operating condition from refrigerant loop (20) side joint, according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in supercooling or supercooling with the supercooling of refrigerant loop (220) with refrigerant condition and outside the temperature degree, reduce the operating frequency of supercooling, allow running capacity reduce with compressor (221).

The 4th solution is on the basis of above-mentioned the 1st solution, above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates.

And, above-mentioned controller (240), constitute according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in above-mentioned supercooling or supercooling with the supercooling of refrigerant loop (220) with refrigerant condition and outside the temperature degree, increase the operating frequency of the fan (230) of above-mentioned heat source side heat exchanger (222), reduce the power consumption of above-mentioned supercooling with compressor (221).

In above-mentioned solution, use in the refrigerant loop (220) in supercooling, repeat such circulation: the air heat exchange that heat source side heat exchanger (222) and by fan (230), is taken into cold-producing medium with the supercooling of compressor (221) ejection from supercooling, then, supercooling with heat exchanger (210) in the cold-producing medium heat exchange of refrigerant loop (20), turn back to supercooling again with compressor (221).

And, controller (240), according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in supercooling or supercooling with the supercooling of refrigerant loop (220) with refrigerant condition and outside the temperature degree, increase the operating frequency of the fan (230) of heat source side heat exchanger (222), allow air quantity increase.At that time, do not allow supercooling change with the running capacity of compressor (221).So, because supercooling uses the supercooling in the refrigerant loop (220) to use the high-pressure of cold-producing medium to descend, so supercooling reduces this supercooling power consumption reduction of compressor (221) with the compression load in the compressor (221).That is to say, use in the compressor (221), by reducing the workload that ejection pressure reduces compression in supercooling.

The 5th solution be the above-mentioned the 1st or the basis of the 2nd solution on, the refrigerant condition of the refrigerant loop (20) that flows in above-mentioned supercooling usefulness heat exchanger (210) is the supercooling degree of supercooling with the cold-producing medium of the refrigerant loop (20) in the heat exchanger (210).

In above-mentioned solution, will detect as the supercooling degree by the refrigerant temperature of the refrigerant loop (20) before the supercooling with by the difference of the refrigerant temperature of the refrigerant loop (20) after the supercooling in heat exchanger (210) in supercooling.And, infer the refrigerant condition of using the refrigerant loop (20) that flows the heat exchanger (210) in supercooling from this supercooling degree.

Specifically, when the supercooling degree is big, from use the sufficiently cooled phenomenon of cold-producing medium of refrigerant loop (20) the heat exchanger (210) in supercooling, can judge from refrigerant loop (20) inflow supercooling less with the refrigerant flow of the refrigerant loop (20) of heat exchanger (210).Controller (240) can be less from inferring the power consumption that about refrigerant loop (20) here.At this moment, do not reduce the power consumption of pump machanism (221).And at the supercooling degree hour, from supercooling with heat exchanger (210) the cold-producing medium of refrigerant loop (20) do not have sufficiently cooled phenomenon, can judge that to flow into supercooling from refrigerant loop (20) more with the refrigerant flow of the refrigerant loop (20) of heat exchanger (210).Can be bigger from inferring the power consumption that about refrigerant loop (20) here.At this moment, controller (240) reduces the power consumption of pump machanism (221), is suppressed in the setting with the power consumption of pump machanism (221) with about the total of the power consumption of refrigerant loop (20).

The 6th solution be the above-mentioned the 1st or the basis of the 2nd solution on, the refrigerant condition of the refrigerant loop (20) that flows in above-mentioned supercooling usefulness heat exchanger (210) is for using the refrigerant flow of the refrigerant loop (20) that flows in the heat exchanger (210) in supercooling.

In above-mentioned solution, directly will detect at the refrigerant flow that supercooling is flowed in heat exchanger (210).Infer the refrigerant condition that the refrigerant loop (20) that supercooling usefulness heat exchanger (210), flows from this refrigerant flow.And controller (240) according to this refrigerant flow and outer temperature degree, reduces the power consumption of pump machanism (221), is suppressed in the setting with the power consumption of pump machanism (221) with about the total of the power consumption of refrigerant loop (20).

The 7th solution be the above-mentioned the 1st or the basis of the 2nd solution on, above-mentioned cooling is with the cooling fluid state of fluid circuit (220), for supercooling with heat exchanger (210) in the cold-producing medium supercooling of refrigerant loop (20) before and the supercooling cooling afterwards temperature difference of fluid.

In above-mentioned solution, detect cooling with fluid circuit (220) in before the supercooling and the supercooling cooling afterwards temperature difference of fluid.Infer the refrigerant condition that the refrigerant loop (20) that supercooling usefulness heat exchanger (210), flows with the temperature difference of fluid from this cooling.

Specifically, when the temperature difference of cooling off the usefulness fluid is big, from use the sufficiently cooled phenomenon of cold-producing medium of refrigerant loop (20) the heat exchanger (210) in supercooling, can judge in supercooling and use the refrigerant flow of the refrigerant loop (20) that flows in the heat exchanger (210) less.Therefore, controller (240) infers that the power consumption that about refrigerant loop (20) is less, does not reduce the power consumption of pump machanism (221).And in cooling with the temperature difference of fluid hour, from supercooling with heat exchanger (210) the cold-producing medium of refrigerant loop (20) do not have sufficiently cooled phenomenon, the refrigerant flow that can judge the refrigerant loop (20) that flows in heat exchanger (210) in supercooling is more.Therefore, controller (240) infers that the power consumption that about refrigerant loop (20) is bigger, reduce the power consumption of pump machanism (221), be suppressed in the setting with the power consumption of pump machanism (221) with about the total of the power consumption of refrigerant loop (20).

The 8th solution be the above-mentioned the 1st or the basis of the 2nd solution on, above-mentioned cooling is with the cooling fluid state of fluid circuit (220), is the cooling of flowing in heat exchanger (210) in the supercooling flow with fluid.

In above-mentioned solution, the refrigerant condition of using the refrigerant loop (20) that flows in the heat exchanger (210) in supercooling from using the cooling of flowing the heat exchanger (210) flow of fluid in supercooling, inferring.Specifically, when cooling with the flow of fluid more after a little while, it is also less to judge the refrigerant flow that flows in heat exchanger (210) in supercooling.At this moment, controller (240) infers that the power consumption that about refrigerant loop (20) is less, does not reduce the power consumption of pump machanism (221).And when cooling with the flow of fluid more for a long time, it is also more to judge the refrigerant flow that flows in heat exchanger (210) in supercooling.At this moment, controller (240), infer that the power consumption that about refrigerant loop (20) is bigger, reduce the power consumption of pump machanism (221), be suppressed in the setting with the power consumption of pump machanism (221) with about the total of the power consumption of refrigerant loop (20).

The 9th solution be the above-mentioned the 1st or the basis of the 2nd solution on, above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates.And the supercooling refrigerant condition of above-mentioned supercooling usefulness refrigerant loop (220) is the high-pressure of supercooling with the usefulness of the supercooling in the refrigerant loop (220) cold-producing medium.

In above-mentioned solution, infer the refrigerant condition that the refrigerant loop (20) that supercooling usefulness heat exchanger (210), flows with the high-pressure of cold-producing medium from supercooling.That is to say that when its high-pressure is low, judges supercooling and tail off with the heat exchange amount in the heat exchanger (210), the refrigerant flow of refrigerant loop (20) is less, infers that the power consumption that about refrigerant loop (20) is less.And, when high-pressure is higher, controller (240), it is many with the heat exchange quantitative change in the heat exchanger (210) to judge supercooling, and the refrigerant flow of refrigerant loop (20) is more, infers that the power consumption that about refrigerant loop (20) is bigger.Therefore, reduce the power consumption of supercooling with compressor (221).

The 10th solution be the above-mentioned the 1st or the basis of the 2nd solution on, above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates.And the supercooling refrigerant condition of above-mentioned supercooling usefulness refrigerant loop (220) is the supercooling high-pressure of the supercooling usefulness cold-producing medium in the refrigerant loop (220) and the pressure differential of low pressure.

In above-mentioned solution, infer the refrigerant condition that the refrigerant loop (20) that supercooling usefulness heat exchanger (210), flows with the high-pressure of cold-producing medium and the pressure differential of low pressure from supercooling.Specifically, when its pressure differential hour, because low pressure almost is maintained by expansion valve etc. and immobilizes, it is low when general therefore to judge high-pressure, and the refrigerant flow of judging the refrigerant loop (20) that flows in heat exchanger (210) in supercooling is less.Therefore, infer that the power consumption that about refrigerant loop (20) is less.And, when pressure differential is big, judge high-pressure height when general, the refrigerant flow of judging the refrigerant loop (20) that flows in heat exchanger (210) in supercooling is more.And, infer that the power consumption that about refrigerant loop (20) is bigger, supercooling reduces with the power consumption of compressor (221).

The 11st solution is to be prerequisite with such refrigerating plant, comprise: have the side of utilization heat exchanger (101,111,131) and heat source side compressor (41,42,43), allow cold-producing medium circulate and carry out the refrigerant loop (20) that steam compression type refrigerating circulates; And has supercooling with heat exchanger (210) with will cool off with the fluid conveyance to the cooling fluid circuit (220) of this supercooling with the pump machanism (221) of heat exchanger (210).This refrigerating plant utilization cooling will offer the above-mentioned cold-producing medium of side heat exchanger (101,111,131) that utilizes in above-mentioned supercooling supercooling in the heat exchanger (210) with fluid.

And, comprising controller (240), control is about the power consumption of above-mentioned refrigerant loop (20) with about the power consumption of above-mentioned cooling with fluid circuit (220).And above-mentioned controller (240) when load increases, with respect to above-mentioned refrigerant loop (20), preferentially allows increase about the power consumption of above-mentioned cooling with fluid circuit (220).

In above-mentioned solution, cooling with fluid circuit (220) in, will offer supercooling usefulness heat exchanger (210) with fluid in order to coolings such as the cold-producing medium of the cold-producing medium of supercooling refrigerant loop (20) and water by pump machanism (221).Use in the heat exchanger (210) in supercooling, the cold-producing medium of refrigerant loop (20) and cooling exchange with fluid thermal.And, to use in the heat exchanger (210) in supercooling, cooling is with the cold-producing medium heat absorption of fluid from refrigerant loop (20), with the refrigerant cools of refrigerant loop (20).

In this refrigerating plant, when increasing when loading, controller (240) carries out preferentially allowing cooling control with the running of the power consumption increase of fluid circuit (220) with respect to refrigerant loop (20).For example, allow the running capacity of pump machanism (221) increase, make about the power consumption of cooling to increase with fluid circuit (220).That is to say, use in the fluid circuit (220),, increase refrigerating capacity by allowing the workload of pump machanism electrical equipment such as (221) increase in cooling.So, even do not allow the power consumption (that is, workload) of the heat source side compressor electrical equipment such as (41,42,43) in the refrigerant loop (20) increase, supercooling also increases with the refrigerating capacity of heat exchanger (210).Therefore, even when the load of refrigerating plant increases, enthalpy towards the cold-producing medium of the refrigerant loop (20) that utilizes side heat exchanger (101,111,131) also is held lower, has guaranteed in the refrigerating capacity of utilizing side heat exchanger (101,111,131).

The 12nd solution is on the basis of above-mentioned the 11st solution, above-mentioned controller (240), constitute control about the power consumption of above-mentioned cooling with fluid circuit (220), so that above-mentioned supercooling becomes desired value with the refrigerant temperature in the outlet of heat exchanger (210), and set above-mentioned desired value with the ambient conditions of heat exchanger (210) according to supercooling, so that when load increases, preferentially allow increase about the power consumption of above-mentioned cooling with fluid circuit (220).

In above-mentioned solution, controller (240) is regulated the desired value of supercooling with the refrigerant outlet temperature of heat exchanger (210) according to the supercooling such as refrigerant flow of outer temperature degree and refrigerant loop (20) with the ambient conditions of heat exchanger (210).That is to say that controller (240) is held the load condition of refrigerating plant from supercooling with the ambient conditions of heat exchanger (210), sets above-mentioned desired value according to its load condition.Therefore, corresponding with its load when load increases, with respect to refrigerant loop (20), allow cooling preferentially increase with the power consumption of fluid circuit (220).

The 13rd solution is on the basis of above-mentioned the 11st solution, and above-mentioned controller (240) constitutes by allowing the power consumption of pump machanism (221) increase, and allows preferentially increase about the power consumption of cooling off with fluid circuit (220).

In above-mentioned solution, controller (240) allows the running capacity of pump machanism (221) increase, and the power consumption of this pump machanism (221) is increased.That is to say, use in the fluid circuit (220), allow offer the supercooling quantity delivered increase of the cooling of heat exchanger (210), increase the refrigerating capacity of supercooling with heat exchanger (210) with fluid in cooling.

The 14th solution is on the basis of above-mentioned the 13rd solution, above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates.And above-mentioned controller (240) constitutes by allowing above-mentioned supercooling increase with the operating frequency of compressor (221), allows this supercooling increase with the power consumption of compressor (221).

In above-mentioned solution, use in the refrigerant loop (220) in supercooling, repeat such circulation: from supercooling with compressor (221) ejection supercooling with cold-producing medium heat source side heat exchanger (222) for example with air heat exchange, then, supercooling with heat exchanger (210) in the cold-producing medium heat exchange of refrigerant loop (20), turn back to supercooling again with compressor (221).Supercooling is with cold-producing medium heat absorption and the evaporation of cold-producing medium from refrigerant loop (20), with the refrigerant cools of refrigerant loop (20) in supercooling usefulness heat exchanger (210).

In this refrigerating plant, when load increases, allow supercooling increase with the operating frequency (that is running capacity) of compressor (221), allow this supercooling increase, so that supercooling becomes desired value with the outlet refrigerant temperature of heat exchanger (210) with the power consumption of compressor (221).That is to say that use in the heat exchanger (210) in supercooling, supercooling increases with the flow of cold-producing medium, refrigerating capacity improves.

The 15th solution is on the basis of above-mentioned the 11st solution, above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates.And above-mentioned controller (240) constitutes by allowing the operating frequency of fan (230) of above-mentioned heat source side heat exchanger (222) increase, and allows preferentially increase about the power consumption of above-mentioned supercooling with refrigerant loop (220).

In above-mentioned solution, use in the refrigerant loop (220) in supercooling, repeat such circulation: the air heat exchange that heat source side heat exchanger (222) and by fan (230), is taken into cold-producing medium with the supercooling of compressor (221) ejection from supercooling, then, supercooling with heat exchanger (210) in the cold-producing medium heat exchange of refrigerant loop (20), turn back to supercooling again with compressor (221).

In this refrigerating plant, when load increases, allow the operating frequency of fan (230) of heat source side heat exchanger (222) increase, increase the power consumption of this fan (230).At that time, do not allow supercooling change with the running capacity of compressor (221).Here, after allowing the operating frequency of fan (230) increase, supercooling reduces with the high-pressure of the supercooling in the refrigerant loop (220) with cold-producing medium, supercooling is risen with the volume efficiency of compressor (221), uses the supercooling of flowing in the heat exchanger (210) to use the flow of cold-producing medium to increase in supercooling.So, supercooling increases with the refrigerating capacity of heat exchanger (210).That is to say, allow the workload of fan (230) increase, improve refrigerating capacity.

The 16th solution is on the basis of above-mentioned the 12nd solution, and above-mentioned supercooling is outer temperature degree with the ambient conditions of heat exchanger (210).

In above-mentioned solution, set the desired value of supercooling with the outlet refrigerant temperature of heat exchanger (210) according to outer temperature degree.That is to say that controller (240) is inferred the load condition of refrigerating plant according to outer temperature degree, after the temperature degree uprises outside it, judges load and increases.

The 17th solution is on the basis of above-mentioned the 12nd solution, and above-mentioned supercooling is the supercooling degree of this supercooling with the cold-producing medium of the refrigerant loop (20) in the heat exchanger (210) with the ambient conditions of heat exchanger (210).

In above-mentioned solution, set the desired value of supercooling with the outlet refrigerant temperature of heat exchanger (210) according to the supercooling degree of the cold-producing medium of refrigerant loop (20).That is to say that controller (240) is inferred the load condition of refrigerating plant according to the supercooling degree of cold-producing medium, after its supercooling degree diminishes, judges load and increases.At this moment, for example, set desired value lower.

The 18th solution is on the basis of above-mentioned the 12nd solution, and above-mentioned supercooling is with the ambient conditions of heat exchanger (210), for use the refrigerant flow of the refrigerant loop (20) that flows in the heat exchanger (210) in this supercooling.

In above-mentioned solution, set the desired value of supercooling with the refrigerant flow of heat exchanger (210) with the outlet refrigerant temperature of heat exchanger (210) according to supercooling.That is to say that controller (240) is inferred the load condition of refrigerating plant according to supercooling with the refrigerant flow of heat exchanger (210), after how its refrigerant flow becomes, judge load and increase.At that time, for example, set desired value lower.

The 19th solution is on the basis of above-mentioned the 12nd solution, above-mentioned supercooling is with the ambient conditions of heat exchanger (210), for this supercooling with heat exchanger (210) in the cold-producing medium supercooling of refrigerant loop (20) before and cooling after the supercooling use the temperature difference of fluid with the cooling of fluid circuit (220).

In above-mentioned solution, set the desired value of supercooling with the temperature difference before and after the supercooling of fluid with the outlet refrigerant temperature of heat exchanger (210) according to cooling.That is to say that controller (240) is inferred the load condition of refrigerating plant according to the temperature difference before and after the supercooling of cooling fluid, after its temperature difference diminishes, judges load and increases.At that time, for example, set desired value lower.

The 20th solution is on the basis of above-mentioned the 12nd solution, and above-mentioned supercooling is used the flow of fluid with the ambient conditions of heat exchanger (210) for use the cooling of flowing in the heat exchanger (210) in this supercooling with the cooling of fluid circuit (220).

In above-mentioned solution, set the desired value of supercooling with the cooling of heat exchanger (210) with the flow of fluid with the outlet refrigerant temperature of heat exchanger (210) according to supercooling.That is to say that controller (240) according to cooling off the load condition of inferring refrigerating plant with the flow of fluid, after how its flow becomes, is judged load and increased.At that time, for example, set desired value lower.

The 21st solution is on the basis of above-mentioned the 12nd solution, above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates.And the ambient conditions of above-mentioned supercooling usefulness heat exchanger (210) is the high-pressure of supercooling with the usefulness of the supercooling in the refrigerant loop (220) cold-producing medium.

In above-mentioned solution, set the desired value of supercooling with the supercooling of refrigerant loop (220) with the high-pressure of cold-producing medium with the outlet refrigerant temperature of heat exchanger (210) according to supercooling.That is to say that controller (240) is inferred the load condition of refrigerating plant according to supercooling with the high-pressure of cold-producing medium, after its high-pressure uprises, judges load and increases.At that time, for example, set desired value lower.

The 22nd solution is on the basis of above-mentioned the 12nd solution, above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates.And the ambient conditions of above-mentioned supercooling usefulness heat exchanger (210) is the supercooling high-pressure of the supercooling usefulness cold-producing medium in the refrigerant loop (220) and the pressure differential of low pressure.

In above-mentioned solution, set the desired value of supercooling with the supercooling of refrigerant loop (220) with the high-pressure of cold-producing medium and the pressure differential of low pressure with the outlet refrigerant temperature of heat exchanger (210) according to supercooling.That is to say that controller (240) is inferred the load condition of refrigerating plant according to supercooling with the height pressure reduction of cold-producing medium, its height pressure reduction become big after, judge load and increase.At that time, for example, set desired value lower.

The 23rd solution is on the basis of above-mentioned the 16th solution, and above-mentioned controller (240) constitutes along with outer temperature degree uprises and makes above-mentioned desired value lower.

In above-mentioned solution, if outer temperature degree uprises, then the phenomenon of the load of refrigerating plant increase is set out, even suppose not change desired value, for supercooling is remained desired value with the outlet refrigerant temperature of heat exchanger (210), also must for example allow the running capacity of pump machanism (221) increase.On the other hand, in this solution, along with outer temperature degree uprises, controller (240) reduces desired value.And, be lower desired value in order to make supercooling with the outlet refrigerant temperature of heat exchanger (210), must further allow the running capacity of pump machanism (221) increase, that is to say, allow the cooling of pump machanism (221) use the supply workload of fluid to increase.Therefore, in the present invention, when because of outside the rising of temperature degree, when the load of refrigerating plant increased, controller (240) preferentially increased the power consumption of using fluid circuit (220) about cooling off by regulating desired value.

-effect-

Therefore, according to the 1st solution, controller (240), according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in supercooling or cooling with the cooling of fluid circuit (220) with the state of fluid and outside the temperature degree, reduce the power consumption of pump machanism (221).Therefore, controller (240) can be under situation about not being subjected to from refrigerant loop (20) side joint about the signal of the operating condition of refrigerant loop (20), reduces the power consumption of the pump machanism (221) of compressor etc.So, can make about the power consumption of cooling and reduce, suppress the power consumption of whole freezing device with fluid circuit (220).Its result can positively turn round in the contract electric weight.

And, when adhering to after the usefulness when being contained in refrigerating plant with fluid circuit (220) cooling, communication in order to the signal of giving and accepting needn't be set between refrigerant loop (20) and cooling are with fluid circuit (220) with connecting up.Therefore, can cut down in order to the operation number of cooling with fluid circuit (220) to be installed, in the accident that can also the people when possible trouble prevents because of misroute etc. operation to be set causes, allow refrigerating capacity improve for fault.

And,,, therefore can positively hold about the reduction of cooling with the power consumption of fluid circuit (220) owing to wait the power consumption of inferring relevant refrigerant loop (20) according to the refrigerant condition of refrigerant loop (20) according to the 2nd solution.So, can positively in the contract electric weight, turn round.

And,,, be higher than the evaporating temperature of the cold-producing medium in utilizing side heat exchanger (101,111,131) in the endothermic temperature or the evaporating temperature of supercooling with the usefulness of the cooling in the heat exchanger (210) fluid according to the 11st solution.Cooling is with the height pressure reduction of the cooling before and after the pump machanism (221) of fluid circuit (220) with fluid, less than the height pressure reduction of the kind of refrigeration cycle in the refrigerant loop (20).And, refrigerating plant of the present invention, for not being allows circulating mass of refrigerant increase in the bigger refrigerant loop of height pressure reduction (20), but allow cooling increase in fluid circuit (220) with the flow of fluid in the littler cooling of height pressure reduction, and the power consumption (workload) of increase pump machanism (221) etc., preferential increasing about the power consumption of cooling with fluid circuit (220).That is to say,, come increase corresponding to load by the workload of the less pump machanism (221) of the original burden of preferential increase etc.Therefore, can suppress reduction that can the rejection coefficient for increase corresponding to the required input of increase of load.Its result can suppress the increase of the power consumption of whole freezing device.

And, according to the 12nd solution, come the target setting value with the ambient conditions of heat exchanger (210) according to the supercooling of outer temperature degree and refrigerant flow etc., so as when load to increase preferential the increase about the power consumption of cooling with fluid circuit (220).Therefore, can positively increase about the power consumption of cooling with fluid circuit (220) according to load condition is preferential.

And, cool off the load condition of inferring refrigerating plant with the information that obtains in the fluid circuit (220) owing to only being used in, the communication wiring in order to the signal of giving and accepting at refrigerant loop (20) with between cooling off with fluid circuit (220) therefore needn't be set.

And, according to the 14th or the 15th solution, only, just can allow supercooling increase at an easy rate, can suppress the power consumption of whole freezing device with the power consumption of refrigerant loop (220) by regulating the running capacity of supercooling with compressor (221) or fan (230).

And,,,, allow cooling preferentially increase with the power consumption of the pump machanism (221) of fluid circuit (220) etc. with respect to the heat source side compressor (41,42,43) of refrigerant loop (20) etc. along with outer temperature degree uprises according to the 23rd solution.So, from can further increasing about the power consumption of cooling with fluid circuit (220) according to load condition is preferential, can the easier and more effectively reduction of the coefficient of performance of freezing-inhibiting device, can suppress the increase of whole power consumption.

The simple declaration of accompanying drawing

Fig. 1 is the piping diagram that shows the structure of the refrigerating plant that comprises the supercooling unit.

Fig. 2 is the piping diagram of the action when showing the cold air operation of refrigerating plant.

Fig. 3 is the piping diagram of action that shows heating installation when running of refrigerating plant.

Fig. 4 is the coordinate diagram that shows the electric quantity change of the outdoor unit among the 1st embodiment.

Fig. 5 is the coordinate diagram that shows the electric quantity change of the outdoor unit in the variation of the 1st embodiment.

Fig. 6 is the coordinate diagram that shows the target liq refrigerant outlet temperature among the 4th embodiment.

Fig. 7 is the flow chart that shows the running control of the controller among the 4th embodiment.

The specific embodiment

Below, with reference to accompanying drawing embodiments of the invention are described in detail.

(the 1st embodiment)

The refrigerating plant (10) of this 1st embodiment is arranged in the convenience store etc., carries out the cooling that air is in harmonious proportion and showcase the is interior shop in.As shown in Figure 1, above-mentioned refrigerating plant (10) has supercooling with heat exchanger (210) and supercooling compressor (221), comprises as the cooling supercooling refrigerant loop (220) of the supercooling of fluid with flow of refrigerant; Utilize side heat exchanger (101,111,131) and heat source side compressor refrigerant loop (41,42,43), that allow flow of refrigerant (20) with having.Refrigerating plant (10) constitutes the cold-producing medium that comes supercooling to flow with the supercooling of refrigerant loop (220) with heat exchanger (210) by supercooling in refrigerant loop (20).That is to say that supercooling constitutes cooling fluid circuit involved in the present invention with refrigerant loop (220).

Below, the structure of refrigerating plant (10) is specified.

In refrigerating plant (10), be provided with outdoor unit (11), air-conditioning unit (12), refrigerator display case (13), refrigerated display case (14), supercharging unit (15) and supercooling unit (200).In this refrigerating plant (10), outdoor unit (11) and supercooling unit (200) are provided with without, remaining air-conditioning unit (12) etc. is arranged in the shop of convenience store etc.

Above-mentioned supercooling unit (200), comprise refrigerant passage (205), supercooling with refrigerant loop (220), supercooling with heat exchanger (210) with as the controller (240) of control device.

On the other hand, be provided with outdoor loop (40) at outdoor unit (11), be provided with air conditioner loop (100) at air-conditioning unit (12), be provided with refrigeration circuit (110) at refrigerator display case (13), be provided with refrigerating circuit (130) at refrigerated display case (14), be provided with boost-up circuit (140) at supercharging unit (15).In refrigerating plant (10), by with pipeline with these loops (40,100 ...) and the refrigerant passage (205) of supercooling unit (200) link together to constitute and allow the refrigerant loop (20) of refrigerating plant (10) of flow of refrigerant.

And, be provided with the 1st hydraulic fluid side connecting pipe (21), the 2nd hydraulic fluid side connecting pipe (22), the 1st gas side connecting pipe (23) and the 2nd gas side connecting pipe (24) at refrigerant loop (20).

The 1st hydraulic fluid side connecting pipe (21) is connected an end of the refrigerant passage (205) of supercooling unit (200) on the outdoor loop (40).One end of the 2nd hydraulic fluid side connecting pipe (22) is connected the other end of refrigerant passage (205).The other end of the 2nd hydraulic fluid side connecting pipe (22) is divided into 3 branches, is connected on air conditioner loop (100), refrigeration circuit (110) and the refrigerating circuit (130).The branch pipe that is connected refrigerating circuit (130) in the 2nd hydraulic fluid side connecting pipe (22) is provided with hydraulic fluid side shut off valve (25).

One end of the 1st gas side connecting pipe (23) is divided into two branches, is connected on refrigeration circuit (110) and the boost-up circuit (140).The branch pipe that is connected boost-up circuit (140) in the 1st gas side connecting pipe (23) is provided with gas side shut off valve (26).The other end of the 1st gas side connecting pipe (23) is connected on the outdoor loop (40).The 2nd gas side connecting pipe (24) is connected air conditioner loop (100) on the outdoor loop (40).

＜outdoor unit 〉

Outdoor unit (11) constitutes the heat source side machine of refrigerating plant (10).This outdoor unit (11) comprises outdoor loop (40).

Be provided with variable displacement compressor (41), the 1st fixed-capacity compressor (42) and the 2nd fixed-capacity compressor (43) in outdoor loop (40) as the heat source side compressor.And, be provided with outdoor heat converter (44), receiver (receiver) (45) and outdoor expansion valve (46) in outdoor loop (40).And, be provided with 3 suction lines (61,62,63), two bleed pipes (64,65), 4 liquid lines (81,82,83,84) and a high-pressure gas pipe (66) in outdoor loop (40).And, be provided with 3 No. four transfer valves (51,52,53), a hydraulic fluid side shut off valve (54) and two gas side shut off valves (55,56) in outdoor loop (40).

In this outdoor loop (40), the 1st hydraulic fluid side connecting pipe (21) is connected on the hydraulic fluid side shut off valve (54), the 1st gas side connecting pipe (23) is connected on the 1st gas side shut off valve (55), the 2nd gas side connecting pipe (24) is connected on the 2nd gas side shut off valve (56).

Variable displacement compressor (41), the 1st fixed-capacity compressor (42) and the 2nd fixed-capacity compressor (43) all are Totally-enclosed-types, high pressure dome type vortex-type compressor.Power to variable displacement compressor (41) by phase inverter (inverter).This variable displacement compressor (41) can change the rotary speed of air compressor motor by allowing the output frequency of phase inverter change, and changes its capacity.And the compressor that the 1st, the 2nd fixed-capacity compressor (42,43) always turns round under certain rotary speed for air compressor motor, its capacity can not change.

The 1st suction line (61), one end are connected on the 1st gas side shut off valve (55).The 1st suction line (61) branches into the 1st branch pipe (61a) and the 2nd branch pipe (61b) at the other end, and the 1st branch pipe (61a) is connected the suction side of variable displacement compressor (41), and the 2nd branch pipe (61b) is connected on the 3 No. four transfer valves (53).The 2nd branch pipe (61b) at the 1st suction line (61) is provided with the check valve (CV-1) that only allows cold-producing medium to flow to the 3rd No. four transfer valves (53) from the 1st gas side shut off valve (55).

The 2nd suction line (62), one end are connected on the 3 No. four transfer valves (53), and the other end is connected the suction side of the 1st fixed-capacity compressor (42).

The 3rd suction line (63), one end are connected on the 2 No. four transfer valves (52).This 3rd suction line (63) branches into the 1st branch pipe (63a) and the 2nd branch pipe (63b) at the other end, and the 1st branch pipe (63a) is connected the suction side of the 2nd fixed-capacity compressor (43), and the 2nd branch pipe (63b) is connected on the 3 No. four transfer valves (53).Be provided with the check valve (CV-2) that only allows cold-producing medium to flow to the 3rd No. four transfer valves (53) from the 2 No. four transfer valves (52) at the 2nd branch pipe (63b) of the 3rd suction line (63).

The 1st bleed pipe (64), at one end branch into the 1st branch pipe (64a) and the 2nd branch pipe (64b), the 1st branch pipe (64a) is connected the ejection side of variable displacement compressor (41), and the 2nd branch pipe (64b) is connected the ejection side of the 1st fixed-capacity compressor (42).The other end of the 1st bleed pipe (64) is connected on the 1 No. four transfer valves (51).The 2nd branch pipe (64b) at the 1st bleed pipe (64) is provided with the check valve (CV-3) that only allows cold-producing medium to flow to the 1st No. four transfer valves (51) from the 1st fixed-capacity compressor (42).

The 2nd bleed pipe (65), the one end is connected the suction side of the 2nd fixed-capacity compressor (43), and the other end is connected the positive front of the 1st No. four transfer valves (51) in the 1st bleed pipe (64).Be provided with the check valve (CV-4) that only allows cold-producing medium to flow to the 1st No. four transfer valves (51) from the 2nd fixed-capacity compressor (43) at the 2nd bleed pipe (65).

Outdoor heat converter (44) is the fin tube type heat exchanger of transverse fin formula.In this outdoor heat converter (44), between cold-producing medium and outdoor air, carry out heat exchange.One end of outdoor heat converter (44) is connected on the 1 No. four transfer valves (51) by shut off valve (57).And the other end of outdoor heat converter (44) is connected the top of receiver (45) by the 1st liquid line (81).Be provided with the check valve (CV-5) that only allows cold-producing medium to flow to receiver (45) from outdoor heat converter (44) at this 1st liquid line (81).

An end of the 2nd liquid line (82) is connected the bottom of receiver (45) by shut off valve (58).The other end of the 2nd liquid line (82) is connected on the hydraulic fluid side shut off valve (54).Be provided with the check valve (CV-6) that only allows cold-producing medium to flow to hydraulic fluid side shut off valve (54) from receiver (45) at the 2nd liquid line (82).

One end of the 3rd liquid line (83) is connected between the check valve (CV-6) and hydraulic fluid side shut off valve (54) in the 2nd liquid line (82).The other end of the 3rd liquid line (83) is connected the top of receiver (45) by the 1st liquid line (81).And, be provided with the check valve (CV-7) that only allows cold-producing medium to flow to the other end from the one end at the 3rd liquid line (83).

One end of the 4th liquid line (84) is connected between the check valve (CV-6) and shut off valve (58) in the 2nd liquid line (82).The other end of the 4th liquid line (84) is connected between the outdoor heat converter (44) and check valve (CV-5) in the 1st liquid line (81).And,, be disposed with check valve (CV-8) and outdoor expansion valve (46) from the one end towards the other end in the 4th liquid line (84).This check valve (CV-8) only allows cold-producing medium to flow to the other end from an end of the 4th liquid line (84).And outdoor expansion valve (46) is made of electric expansion valve.

High-pressure gas pipe (66), one end are connected the positive front of the 1st No. four transfer valves (51) in the 1st bleed pipe (64).High-pressure gas pipe (66), branch into the 1st branch pipe (66a) and the 2nd branch pipe (66b) at the other end, the 1st branch pipe (66a) is connected the downstream side of the check valve (CV-5) in the 1st liquid line (81), and the 2nd branch pipe (66b) is connected on the 3 No. four transfer valves (53).The 1st branch pipe (66a) at high-pressure gas pipe (66) is provided with magnetic valve (SV-7) and check valve (CV-9).This check valve (CV-9) is arranged in the downstream side of magnetic valve (SV-7), only allows cold-producing medium to flow to the 1st liquid line (81) from magnetic valve (SV-7).

The 1 No. four transfer valves (51), the 1st passage (port) is connected the terminal of the 1st bleed pipe (64), and the 2nd passage is connected the 2 No. four transfer valves (52), and the 3rd passage is connected outdoor heat converter (44), and the 4th passage is connected the 2nd gas side shut off valve (56).The 1 No. four transfer valves (51) can switch to the 1st state (state that Fig. 1 represents with solid line) and the 2nd state (state that Fig. 1 dots), wherein, described the 1st state is that the 1st passage and the 3rd passage are interconnected, the state that the 2nd passage and the 4th passage are interconnected, described the 2nd state is that the 1st passage and the 4th passage are interconnected, the state that the 2nd passage and the 3rd passage are interconnected.

The 2 No. four transfer valves (52), the 1st passage is connected the downstream side of the check valve (CV-4) in the 2nd bleed pipe (65), and the 2nd passage is connected the initiating terminal of the 2nd suction line (62), and the 4th passage is connected the 2nd passage of the 1st No. four transfer valves (51).And the 3rd passage of the 2nd No. four transfer valves (52) is sealed.The 2 No. four transfer valves (52) can switch to the 1st state (state that Fig. 1 represents with solid line) and the 2nd state (state that Fig. 1 dots), wherein, above-mentioned the 1st state is that the 1st passage and the 3rd passage are interconnected, the state that the 2nd passage and the 4th passage are interconnected, above-mentioned the 2nd state is that the 1st passage and the 4th passage are interconnected, the state that the 2nd passage and the 3rd passage are interconnected.

The 3 No. four transfer valves (53), the 1st passage is connected the terminal of the 2nd branch pipe (66b) of high-pressure gas pipe (66), the 2nd passage is connected the initiating terminal of the 2nd suction line (62), the 3rd passage is connected the terminal of the 2nd branch pipe (61b) of the 1st suction line (61), and the 4th passage is connected the terminal of the 2nd branch pipe (63b) of the 3rd suction line (63).The 3 No. four transfer valves (53) can switch to the 1st state (state that Fig. 1 represents with solid line) and the 2nd state (state that Fig. 1 dots), wherein, above-mentioned the 1st state is that the 1st passage and the 3rd passage are interconnected, the state that the 2nd passage and the 4th passage are interconnected, above-mentioned the 2nd state is that the 1st passage and the 4th passage are interconnected, the state that the 2nd passage and the 3rd passage are interconnected.

Also be provided with playpipe (85), communicating pipe (87), oil eliminator (75) and oil return pipe (76) in outdoor loop (40).And, also be provided with 4 oil equalizing pipes (71,72,73,74) in outdoor loop (40).

Playpipe (85) sprays in order to carry out so-called liquid.Playpipe (85), one end are connected between the check valve (CV-8) and outdoor expansion valve (46) in the 4th liquid line (84), and the other end is connected on the 1st suction line (61).In this playpipe (85), be disposed with shut off valve (59) and flow control valve (86) towards the other end from the one end.Flow control valve (86) is made of electric expansion valve.

Communicating pipe (87), the one end is connected between the shut off valve (59) and flow control valve (86) in the playpipe (85), and the other end is connected the upstream side of the magnetic valve (SV-7) in the 1st branch pipe (66a) of high-pressure gas pipe (66).Be provided with the check valve (CV-10) that only allows cold-producing medium to flow to the other end from the one end this communicating pipe (87).

Oil eliminator (75), the link position that is arranged on ratio the 2nd bleed pipe (65) in the 1st bleed pipe (64) and high-pressure gas pipe (66) is by on the position of upstream side.This oil eliminator (75) is to be used for from the ejection gas of compressor (41,42) refrigerator oil being separated.

Oil return pipe (76), one end are connected on the oil eliminator (75).Oil return pipe (76) branches into the 1st branch pipe (76a) and the 2nd branch pipe (76b) at the other end, and the 1st branch pipe (76a) is connected the downstream side of the flow control valve (86) in the playpipe (85), and the 2nd branch pipe (76b) is connected on the 2nd suction line (62).And, be respectively arranged with a magnetic valve (SV-5, SV-6) at the 1st branch pipe (76a) and the 2nd branch pipe (76b) of oil return pipe (76).Behind the magnetic valve of opening the 1st branch pipe (76a) (SV-5), the refrigerator oil that separates in oil eliminator (75) is sent back to the 1st suction line (61) by playpipe (85).On the other hand, behind the magnetic valve of opening the 2nd branch pipe (76b) (SV-6), the refrigerator oil that separates in oil eliminator (75) is sent back to the 2nd suction line (62).

The 1st oil equalizing pipe (71), one end are connected on the variable displacement compressor (41), and the other end is connected on the 2nd suction line (62).Be provided with magnetic valve (SV-1) at the 1st oil equalizing pipe (71).The 2nd oil equalizing pipe (72), one end are connected on the 1st fixed-capacity compressor (42), and the other end is connected on the 1st branch pipe (63a) of the 3rd suction line (63).Be provided with magnetic valve (SV-2) at the 2nd oil equalizing pipe (72).The 3rd oil equalizing pipe (73), one end are connected on the 2nd fixed-capacity compressor (43), and the other end is connected on the 1st branch pipe (61a) of the 1st suction line (61).Be provided with magnetic valve (SV-3) at the 3rd oil equalizing pipe (73).The 4th oil equalizing pipe (74), one end are connected the upstream side of the magnetic valve (SV-2) in the 2nd oil equalizing pipe (72), and the other end is connected on the 1st branch pipe (61a) of the 1st suction line (61).Be provided with magnetic valve (SV-4) at the 4th oil equalizing pipe (74).Magnetic valve by suitably opening or closing each oil equalizing pipe (71～74) (SV-1～SV-4), with the amount of the stockpiling equalization of the refrigerator oil in each compressor (41,42,43).

Also be provided with various sensors and pressure switch in outdoor loop (40), do not illustrate among the figure.

And, be provided with outdoor fan (48) at outdoor unit (11).By this outdoor fan (48) outdoor air is delivered to outdoor heat converter (44).

＜air-conditioning unit 〉

Air-conditioning unit (12) formation is utilized the side machine.Air-conditioning unit (12) comprises air conditioner loop (100).This air conditioner loop (100), that end of its hydraulic fluid side are connected the 2nd hydraulic fluid side connecting pipe (22), and that end of gas side is connected the 2nd gas side connecting pipe (24).

In air conditioner loop (100), be disposed with the heat exchanger of air condition (101) that air-conditioning expansion valve (102) and conduct utilize the side heat exchanger from that end of its hydraulic fluid side towards that end of gas side.Heat exchanger of air condition (101) is the fin tube type heat exchanger of horizontal tab style.In this heat exchanger of air condition (101), between cold-producing medium and room air, carry out heat exchange.On the other hand, air-conditioning expansion valve (102) is made of electric expansion valve.

Be provided with air-conditioning fan (105) at air-conditioning unit (12).By this air-conditioning fan (105) room air in the shop is delivered to heat exchanger of air condition (101).

＜refrigerator display case 〉

Refrigerator display case (13) formation is utilized the side machine.Refrigerator display case (13) comprises refrigeration circuit (110).This refrigeration circuit (110), that end of its hydraulic fluid side are connected the 2nd hydraulic fluid side connecting pipe (22), and that end of gas side is connected the 1st gas side connecting pipe (23).

In refrigeration circuit (110), be disposed with the refrigeration heat exchanger (111) that refrigeration magnetic valve (114), refrigeration expansion valve (112) and conduct utilize the side heat exchanger from that end of its hydraulic fluid side towards that end of gas side.Refrigeration heat exchanger (111) is the fin tube type heat exchanger of horizontal tab style.In this refrigeration heat exchanger (111), between cold-producing medium and Ku Nei air, carry out heat exchange.Refrigeration expansion valve (112) is made of the temperature automatic expansion valve.The temperature sensing tube (113) of refrigeration expansion valve (112) is installed on the outlet side pipeline of refrigeration heat exchanger (111).

Be provided with freezer internal fan (115) at refrigerator display case (13).By this freezer internal fan (115) air in the storehouse of refrigerator display case (13) is delivered to refrigeration heat exchanger (111).

＜refrigerated display case 〉

Refrigerated display case (14) formation is utilized the side machine.Refrigerated display case (14) comprises refrigerating circuit (130).This refrigerating circuit (130), that end of its hydraulic fluid side are connected the 2nd hydraulic fluid side connecting pipe (22).And that end of gas side of refrigerating circuit (130) is connected supercharging unit (15) by pipeline.

In refrigerating circuit (130), be disposed with the freezing heat-exchanger (131) that freezing magnetic valve (134), freezing expansion valve (132) and conduct utilize the side heat exchanger from that end of its hydraulic fluid side towards that end of gas side.Freezing heat-exchanger (131) is the fin tube type heat exchanger of horizontal tab style.In this freezing heat-exchanger (131), between cold-producing medium and Ku Nei air, carry out heat exchange.Freezing expansion valve (132) is made of the temperature automatic expansion valve.The temperature sensing tube (133) of freezing expansion valve (132) is installed on the outlet side pipeline of freezing heat-exchanger (131).

Be provided with freezer internal fan (135) at refrigerated display case (14).By this freezer internal fan (135) air in the storehouse of refrigerated display case (14) is delivered to freezing heat-exchanger (131).

＜supercharging unit 〉

Supercharging unit (15) comprises boost-up circuit (140).Be provided with booster compressor (141), suction line (143), bleed pipe (144) and bypass pipe (150) at this boost-up circuit (140).

Booster compressor (141) is the high pressure dome type vortex-type compressor of full seal type.Power to booster compressor (141) by phase inverter.This booster compressor (141) can change by the output frequency that makes phase inverter, changes the rotary speed of air compressor motor, changes its capacity.

Suction line (143), its terminal is connected the suction side of booster compressor (141).The initiating terminal of suction line (143) is connected that end of gas side of refrigerating circuit (130) by pipeline.

Bleed pipe (144), its initiating terminal are connected the ejection side of booster compressor (141), and terminal is connected the 1st gas side connecting pipe (23).In this bleed pipe (144), be disposed with high-pressure switch (148), oil eliminator (145) and ejection side check valve (149) from its initiating terminal towards terminal.Ejection side check valve (149) only allows cold-producing medium to flow to terminal from the initiating terminal of bleed pipe (144).

Oil eliminator (145) is in order to refrigerator oil is separated from the ejection gas of booster compressor (141).One end of oil return pipe (146) is connected on the oil eliminator (145).The other end of oil return pipe (146) is connected on the suction line (143).Be provided with capillary (147) at oil return pipe (146).The refrigerator oil that separates in oil eliminator (145) is sent back to the suction side of booster compressor (141) by oil return pipe (146).

Bypass pipe (150), its initiating terminal are connected suction line (143), and terminal is connected the oil eliminator (145) in the bleed pipe (64) and sprays between the side check valve (149).Be provided with the bypass check valve (151) that only allows cold-producing medium to flow to terminal from its initiating terminal at this bypass pipe (150).

＜supercooling unit 〉

As mentioned above, supercooling unit (200) comprising: refrigerant passage (205), supercooling refrigerant loop (220), supercooling heat exchanger (210) and controller (240).

Refrigerant passage (205), one end are connected the 1st hydraulic fluid side connecting pipe (21), and the other end is connected the 2nd hydraulic fluid side connecting pipe (22).

Supercooling is with the loop circuit of refrigerant loop (220) for successively supercooling being formed by connecting with heat exchanger (210) with expansion valve (223) and supercooling with outdoor heat converter (222), for the supercooling of expansion mechanism with compressor (221), supercooling with pipeline.This supercooling with refrigerant loop (220) in, utilize supercooling to allow the supercooling that is filled circulate and carry out steam compression type refrigerating and circulate with cold-producing medium with compressor (221).That is to say that use in the refrigerant loop (220) in this supercooling, the different supercooling of cold-producing medium that transference is flowed circulates with cold-producing medium in the refrigerant loop (20) of above-mentioned refrigerating plant (10).And in the present embodiment, supercooling constitutes pump machanism with compressor (221), and supercooling constitutes the heat source side heat exchanger with outdoor heat converter (222).

Supercooling is the high pressure dome type vortex-type compressor of full seal type with compressor (221).Power with compressor (221) to supercooling by phase inverter.This supercooling can change by the output frequency that makes phase inverter with compressor (221), changes the rotary speed of air compressor motor, changes its capacity.Supercooling is the fin tube type heat exchanger of transverse fin formula with outdoor heat converter (222).Use in the outdoor heat converter (222) in this supercooling, between supercooling is with cold-producing medium and outdoor air, carry out heat exchange.Supercooling is made of electric expansion valve with expansion valve (223).

Supercooling is made of so-called heat-exchangers of the plate type with heat exchanger (210).Form a plurality of the 1st streams (211) and the 2nd stream (212) in supercooling respectively with heat exchanger (210).Supercooling is connected on the 1st stream (211) with refrigerant loop (220), refrigerant passage (205) is connected on the 2nd stream (212).And this supercooling makes the cold-producing medium heat exchange of the supercooling of circulation the 1st stream (211) with the refrigerating plant (10) of cold-producing medium and circulation the 2nd stream (212) with heat exchanger (210).

Be provided with various sensors and pressure switch at supercooling unit (200).Specifically, the supercooling in refrigerant passage (205) is provided with temperature sensor (237,238) as Temperature Detector with the both sides of heat exchanger (210).In refrigerant passage (205),, promptly be provided with outlet side refrigerant temperature sensors (237) near the part that is connected the end of the 2nd hydraulic fluid side connecting pipe (22) near the part of supercooling with heat exchanger (210) other end.And, in this refrigerant passage (205),, promptly be provided with entrance side refrigerant temperature sensors (238) near the part that is connected the end of the 1st hydraulic fluid side connecting pipe (21) near the part of supercooling with heat exchanger (210) one ends.

And, the outer air-temperature sensor (231) and the outdoor fan (230) of temperature degree outside supercooling unit (200) is provided with detection.By this outdoor fan (230) outdoor air is delivered to supercooling outdoor heat converter (222).

Import the detected value of the detected value of outlet side refrigerant temperature sensors (237), the detected value of entrance side refrigerant temperature sensors (238), outer air-temperature sensor (231) etc. to controller (240).And this controller (240) constitutes according to the detected value of the sensor that is transfused to and controls supercooling with the starting of compressor (221) with stop.Come the signal of the refrigerating plant (10) of free off-premises station group (11) and air-conditioning unit formations such as (12) all not to be input in this controller (240).That is to say that only according to the detected value etc. of the sensor that is arranged on supercooling unit (200), the information that obtains in the inside of supercooling unit (200) is carried out the running capacity control of supercooling with compressor (221) to controller (240).

The running action of-refrigeration system-

Main action in the running action that above-mentioned refrigerating plant (10) is carried out is illustrated.

＜cold air operation 〉

Cold air operation carries out the cooling of room air for to carry out the cooling of air in the storehouse in refrigerator display case (13) and refrigerated display case (14) in air-conditioning unit (12), with the running of freezing in the shop.

As shown in Figure 2, in cold air operation, the 1 No. four transfer valves (51), the 2 No. four transfer valves (52) and the 3 No. four transfer valves (53) are set at the 1st state respectively.And,, on the other hand, suitably regulate the aperture of air-conditioning expansion valve (102), refrigeration expansion valve (112) and freezing expansion valve (132) with outdoor expansion valve (46) Close All.Under this state, make variable displacement compressor (41), the 1st fixed-capacity compressor (42), the 2nd fixed-capacity compressor (43) and booster compressor (141) running.In this cold air operation, supercooling unit (200) becomes operating condition.Running action to supercooling unit (200) later on is illustrated.

Be sent to outdoor heat converter (44) from the cold-producing medium of variable displacement compressor (41), the 1st fixed-capacity compressor (42) and the 2nd fixed-capacity compressor (43) ejection by the 1 No. four transfer valves (51).In outdoor heat converter (44), cold-producing medium is to outdoor air heat release, condensation.Condensed refrigerant flows into the 1st hydraulic fluid side connecting pipe (21) by the 1st liquid line (81), receiver (45) and the 2nd liquid line (82) successively in outdoor heat converter (44).

The cold-producing medium that flows into the 1st hydraulic fluid side connecting pipe (21) flows into the refrigerant passage (205) of supercooling unit (200).Flow into the cold-producing medium of refrigerant passage (205), during by 2nd stream (212) of supercooling, further be cooled with heat exchanger (210).The liquid refrigerant (supercooling cold-producing medium) of the supercooling state that is cooled in heat exchanger (210) in supercooling is assigned to air conditioner loop (100), refrigeration circuit (110) and refrigerating circuit (130) by the 2nd hydraulic fluid side connecting pipe (22).

The cold-producing medium that flows into air conditioner loop (100) is depressurized the back and imports heat exchanger of air condition (101) by air-conditioning expansion valve (102) time.In heat exchanger of air condition (101), cold-producing medium absorbs heat from room air, evaporation.At that time, in heat exchanger of air condition (101), the cold-producing medium evaporating temperature is set at for example about 5 ℃.In air-conditioning unit (12), the room air that will be cooled in heat exchanger of air condition (101) provides in the shop.

The cold-producing medium of evaporation flows into outdoor loop (40) by the 2nd gas side connecting pipe (24) in heat exchanger of air condition (101), then, and successively by the 1 No. four transfer valves (51) and the 2 No. four transfer valve (52) inflow the 3rd suction lines (63).Flow into the cold-producing medium of the 3rd suction line (63), its part sucks the 2nd fixed-capacity compressor (43) by the 1st branch pipe (63a), remaining is inhaled into the 1st fixed-capacity compressor (42) by the 2nd branch pipe (63b), the 3 No. four transfer valves (53) and the 2nd suction line (62) successively.

The cold-producing medium that flows into refrigeration circuit (110) is depressurized the back and imports refrigeration heat exchanger (111) by refrigeration expansion valve (112) time.In refrigeration heat exchanger (111), cold-producing medium air heat absorption in the storehouse, evaporation.At that time, in refrigeration heat exchanger (111), the cold-producing medium evaporating temperature for example is set at about-5 ℃.The cold-producing medium of evaporation flows into the 1st gas side connecting pipe (23) in refrigeration heat exchanger (111).Air offers in the storehouse in the storehouse that will be cooled in refrigeration heat exchanger (111) in refrigerator display case (13), and storehouse temperature is remained on for example about 5 ℃.

The cold-producing medium that flows into refrigerating circuit (130) is depressurized the back and imports freezing heat-exchanger (131) by freezing expansion valve (132) time.In freezing heat-exchanger (131), cold-producing medium is the air heat absorption in the storehouse, evaporation.At that time, at freezing heat-exchanger (131) the cold-producing medium evaporating temperature for example is set at about-30 ℃.Air offers in the storehouse in the storehouse that will be cooled in freezing heat-exchanger (131) in refrigerated display case (14), and storehouse temperature is for example remained on about-20 ℃.

The cold-producing medium of evaporation in freezing heat-exchanger (131) flows into boost-up circuit (140), is inhaled into booster compressor (141).Refrigerant compressed flows into the 1st gas side connecting pipe (23) by bleed pipe (144) in booster compressor (141).

In the 1st gas side connecting pipe (23), cold-producing medium of sending into from refrigeration circuit (110) and the cold-producing medium interflow of sending into from boost-up circuit (140).And these cold-producing mediums flow into the 1st suction line (61) in outdoor loop (40) by the 1st gas side connecting pipe (23).The cold-producing medium that flows into the 1st suction line (61) is inhaled into variable displacement compressor (41) by its 1st branch pipe (61a).

＜heating installation running 〉

Heating installation operates as the cooling of carrying out air in the storehouse in refrigerator display case (13) and refrigerated display case (14), carries out the heating of room air in air-conditioning unit (12), gives the running of heating in the shop.

As shown in Figure 3, in outdoor loop (40), the 1 No. four transfer valves (51) are set at the 2nd state, the 2 No. four transfer valves (52) are set at the 1st state, the 3 No. four transfer valves (53) are set at the 1st state.And,, on the other hand, suitably regulate the aperture of air-conditioning expansion valve (102), refrigeration expansion valve (112) and freezing expansion valve (132) with outdoor expansion valve (46) Close All.Under this state, make the running of variable displacement compressor (41) and booster compressor (141), the 1st fixed-capacity compressor (42) and the 2nd fixed-capacity compressor (43) are stopped.And outdoor heat converter (44) becomes halted state when not being admitted to cold-producing medium.In the running of the 1st heating installation, supercooling unit (200) becomes halted state.

The heat exchanger of air condition (101) by the 1 No. four transfer valves (51) and the 2nd gas side connecting pipe (24) importing air conditioner loop (100) successively from the cold-producing medium of variable displacement compressor (41) ejection, to the room air heat release, condensation.In air-conditioning unit (12), indoor air heated is provided in the shop in heat exchanger of air condition (101).Condensed refrigerant is distributed to refrigeration circuit (110) and refrigerating circuit (130) by the 2nd hydraulic fluid side connecting pipe (22) in heat exchanger of air condition (101).

In refrigerator display case (13) and refrigerated display case (14), the same during with above-mentioned cold air operation, carry out the cooling of air in the storehouse.The cold-producing medium evaporation back in refrigeration heat exchanger (111) that flows into refrigeration circuit (110) flows into the 1st gas side connecting pipe (23).On the other hand, after the cold-producing medium of inflow refrigerating circuit (130) evaporates in freezing heat-exchanger (131), in booster compressor (141), be compressed, flow into the 1st gas side connecting pipe (23) then.Flow into the cold-producing medium of the 1st gas side connecting pipe (23),, be inhaled into variable displacement compressor (41), be compressed by behind the 1st suction line (61).

So, in the running of the 1st heating installation, cold-producing medium heat absorption in refrigeration heat exchanger (111) and freezing heat-exchanger (131), cold-producing medium heat release in heat exchanger of air condition (101).And the heat of cold-producing medium utilization absorption of air in the storehouse heats in the shop in refrigeration heat exchanger (111) and freezing heat-exchanger (131).

In addition, in the heating installation running, also can make the 1st fixed-capacity compressor (42) running.Whether making the 1st fixed-capacity compressor (42) running is to decide according to the cooling load in refrigerator display case (13) and the refrigerated display case (14).

So, because in heating installation running, outer temperature degree is lower, only uses refrigerating plant (10) just can bring into play the ability of regulation fully, use the situation of supercooling usefulness compressor (221) when therefore not having as cold air operation.

The running action of-supercooling unit-

Running action to supercooling unit (200) is illustrated.Under the operating condition of supercooling unit (200), supercooling is suitably regulated the aperture of supercooling with expansion valve (223) simultaneously with compressor (221) running.

As shown in Figure 2, use the outdoor heat converter (222) to outdoor air heat release, condensation in supercooling with cold-producing medium with the supercooling of compressor (221) ejection from supercooling.Supercooling with outdoor heat converter (222) in the supercooling cold-producing medium of condensation, being depressurized during with expansion valve (223), flow into the 1st stream (211) of supercooling usefulness heat exchanger (210) then by supercooling.In 1st stream (211) of supercooling with heat exchanger (210), supercooling is evaporated with the cold-producing medium heat absorption of cold-producing medium from the 2nd stream (212).Supercooling with heat exchanger (210) in the supercooling of evaporation be inhaled into supercooling with compressor (221) with cold-producing medium, be compressed.

Detected value, the detected value of outlet side refrigerant temperature sensors (237) and the detected value of entrance side refrigerant temperature sensors (238) of air-temperature sensor (231) outside above-mentioned controller (240) input.Controller (240), the detected value of supercooling with two refrigerant temperature sensors (237,238) in the running of compressor (221) compared, from this comparative result infer the refrigerant loop (20) that flows with heat exchanger (210) in supercooling be the supercooling degree of refrigerant condition.Constituting to decide according to this supercooling degree with by the detected outer temperature degree of outer air-temperature sensor (231) allows supercooling continue or to stop with the running of compressor (221).

Control value action to this controller (240) is illustrated.

At first, from infer the refrigerant condition of the refrigerant loop (20) that flows with heat exchanger (210) in supercooling by the supercooling degree of the cold-producing medium of said temperature detector (237,238) detected refrigerant loops (20).Served as cooling degree when big, from the cold-producing medium of refrigerant loop (20) by supercooling with the sufficiently cooled phenomenon of heat exchanger (210), can judge that to flow into supercooling from refrigerant loop (20) less with the cold-producing medium of the refrigerant loop (20) of heat exchanger (210).Controller (240) can be less from inferring the power consumption that about refrigerant loop (20) here.

And served as cooling degree hour, from the cold-producing medium of refrigerant loop (20) not by supercooling with the sufficiently cooled phenomenon of heat exchanger (210), can judge that to flow into supercooling from refrigerant loop (20) more with the cold-producing medium of the refrigerant loop (20) of heat exchanger (210).Can be bigger from inferring the power consumption that about refrigerant loop (20) here.

Specifically, as shown in Figure 4, use pre-prepd supposition curve, controller (240) from the supercooling degree and outside the temperature degree infer the electric weight of outdoor unit (11).And, calculate the electric weight of outdoor unit (11) and supercooling total with the electric weight of compressor (221), judge that it adds up to whether in limits value.This limits value is so long as to be no more than the contract electric weight just passable with the total of other power consumption machine.

Controller (240) when the electric weight of judging outdoor unit (11) and supercooling surpass limits value with the total of the electric weight of compressor (221), just allows supercooling stop with the running of compressor (221).And when the electric weight of judging outdoor unit (11) and supercooling surpass limits value with the total of the electric weight of compressor (221), just allow supercooling continue with the running of compressor (221).

In addition, in the present embodiment, though by allowing supercooling stop, the electric weight of whole freezing system is reduced in the limits value with the running of compressor (221), but also can allow supercooling descend, reduce the electric weight of whole freezing device (10) with the operating frequency of compressor (221).That is to say that the present invention reduces the power consumption of this supercooling with compressor (221) by directly reducing the operating frequency of supercooling with compressor (221).

The effect of-Di 1 embodiment-

In above-mentioned supercooling unit (200), controller (240), according to the detected value that is arranged on the sensor in the supercooling unit (200) etc., only the information that obtains in supercooling unit (200) is controlled the running of supercooling with compressor (221).That is to say, in this supercooling unit (200), even and do not carry out giving and accepting of signal etc. between the refrigerant loop (20), also can control the running of supercooling according to the operating condition of refrigerant loop (20) with compressor (221).Therefore, for example, in the time of in above-mentioned supercooling unit (200) being installed in refrigerant loop (20), as long as the refrigerant passage (205) of supercooling unit (200) is connected on the 1st, the 2nd hydraulic fluid side connecting pipe (21,22) of refrigerant loop (20), the communication wiring in order to the signal of giving and accepting needn't be set between refrigerant loop (20) and supercooling unit (200).

Therefore, use the present invention, can cut down the operation number when being installed in supercooling unit (200) in the refrigerating plant (10), the accident that people when can also possible trouble preventing because of misroute etc. operation to be set causes for fault, simultaneously, the apparatus for supercooling that can turn round in contract demand on one side suppresses the electric weight of whole freezing device (10), Yi Bian improve its refrigerating capacity.

Each variation of-Di 1 embodiment-

Each variation (the 1st variation～the 5th variation) is for inferring the example of the electric weight of outdoor unit (11) according to the various parameters beyond the supercooling degree of the cold-producing medium of refrigerant loop (20).

-Di 1 variation-

In the supercooling unit (200) of this 1st variation, also can be provided as the flow sensor of flow detector in refrigerant passage (205), turn round the control supercooling with compressor (221) according to the flow of the detected refrigerant passage of this flow sensor (205).That is to say that the detection flowmeter of flow sensor is shown in the refrigerant condition of supercooling with the refrigerant loop (20) that flows in the heat exchanger (210).

Specifically, in this supercooling unit (200), to the detected value of controller (240) input flow rate sensor and outside the detected value of air-temperature sensor (231).As shown in Figure 5, use pre-prepd supposition curve, control value device (240), from the detected value of flow sensor and outside the detected value of air-temperature sensor (231) infer the electric weight of outdoor unit (11).And, calculate this electric weight of inferring the outdoor unit (11) that and supercooling the total of electric weight with compressor (221), judge that it adds up to whether in limits value.This limits value is as long as to be no more than the contract electric weight just passable with the total of other power consumption machine.

Control value device (240) when the electric weight of judging outdoor unit (11) and supercooling surpass limits value with the total of the electric weight of compressor (221), allows supercooling stop with the running of compressor (221).And when the electric weight of judging outdoor unit (11) and supercooling surpass limits value with the total of the electric weight of compressor (221), allow supercooling continue with the running of compressor (221).

-Di 2 variation-

In the supercooling unit (200) of this 2nd variation, also can use the both sides of heat exchanger (210) in supercooling with the supercooling in the refrigerant loop (220), just the last downstream side of the 1st stream (211) is provided as the temperature sensor of supercooling with the Temperature Detector of cold-producing medium, turns round according to the detected detected temperatures difference of these two temperature sensors and controls supercooling compressor (221).That is to say, the above-mentioned detected supercooling temperature difference of cold-producing medium, for with before the cold-producing medium supercooling of refrigerant loop (20) and the supercooling after the supercooling with the temperature difference of cold-producing medium, the state of cold-producing medium is used in the expression supercooling with the supercooling in the refrigerant loop (220).

In this supercooling unit (200), to controller (240) import each temperature sensor detected value and outside the detected value of air-temperature sensor (231).Control value device (240) uses pre-prepd supposition curve, from the difference of the detected value of each temperature sensor and outside the detected value of air-temperature sensor (231) infer and the electric weight of outdoor unit (11) do not illustrate among the figure.For example, when the difference of the detected value of each temperature sensor is big, from use the sufficiently cooled phenomenon of cold-producing medium of refrigerant loop (20) the heat exchanger (210) in supercooling, it is less with the refrigerant flow of the refrigerant loop (20) in the heat exchanger (210) to judge supercooling, infers that the power consumption that about refrigerant loop (20) is less.And, when the difference of the detected value of each temperature sensor hour, from supercooling with heat exchanger (210) the cold-producing medium of refrigerant loop (20) do not have sufficiently cooled phenomenon, it is more with the refrigerant flow of the refrigerant loop (20) in the heat exchanger (210) to judge supercooling, infers that the power consumption that about refrigerant loop (20) is bigger.

-Di 3 variation-

In the supercooling unit (200) of this 3rd variation, the also flow sensor that can be provided as flow detector with the supercooling in the refrigerant loop (220) with the entrance side or the outlet side of heat exchanger (210) in supercooling turns round the control supercooling with compressor (221) according to this detected flow.That is to say that detected flowmeter is shown the flow of the supercooling of flowing of supercooling usefulness refrigerant condition with cold-producing medium in supercooling usefulness heat exchanger (210).

In this supercooling unit (200), to the detected value of controller (240) input flow rate sensor and outside the detected value of air-temperature sensor (231).Control value device (240) uses pre-prepd supposition curve, from the detected value of flow sensor and outside the detected value of air-temperature sensor (231) infer and the electric weight of outdoor unit (11) do not illustrate among the figure.For example, when the detected value of flow sensor hour, it is less with the refrigerant flow of the refrigerant loop (20) in the heat exchanger (210) to judge supercooling, infers that the power consumption that about refrigerant loop (20) is less.And when the detected value of flow sensor was big, it was more with the refrigerant flow of the refrigerant loop (20) in the heat exchanger (210) to judge supercooling, infers that the power consumption that about refrigerant loop (20) is bigger.

-Di 4 variation-

In the supercooling unit (200) of this 4th variation, also can be provided as and detect supercooling with the pressure sensor of the supercooling in the refrigerant loop (220), turn round the control supercooling with compressor (221) according to this detected pressure with the pressure detector of the high-pressure of cold-producing medium.That is to say the detected pressure representative supercooling state of cold-producing medium.

In this supercooling unit (200), to the detected value of controller (240) input pressure sensor and outside the detected value of air-temperature sensor (231).Control value device (240) uses pre-prepd supposition curve, from the detected value of pressure sensor and outside the detected value of air-temperature sensor (231) infer and the electric weight of outdoor unit (11) do not illustrate among the figure.For example, when the detected value of pressure sensor hour, it is less with the flow of cold-producing medium with the supercooling in the heat exchanger (210) with outdoor heat converter (222) and supercooling to judge supercooling, and supercooling is also less with the refrigerant flow of the refrigerant loop (20) in the heat exchanger (210).Therefore, infer that the power consumption that about refrigerant loop (20) is less.And, when the detected value of pressure sensor is big, it is more with the flow of cold-producing medium with the supercooling in the heat exchanger (210) with outdoor heat converter (222) and supercooling to judge supercooling, and supercooling is also more with the refrigerant flow of the refrigerant loop (20) in the heat exchanger (210).So, infer that the power consumption that about refrigerant loop (20) is bigger.

-Di 5 variation-

In the supercooling unit (200) of this 5th variation, also can be provided as and detect supercooling with two pressure sensors of the supercooling in the refrigerant loop (220), turn round the control supercooling with compressor (221) according to these two detected pressure differentials with the pressure detector of the high-pressure of cold-producing medium and low pressure.That is to say that this detected pressure differential is represented the state of supercooling with cold-producing medium.

In this supercooling unit (200), to controller (240) import each pressure sensor detected value and outside the detected value of air-temperature sensor (231).Control value device (240) uses pre-prepd supposition curve, from the difference of the detected value of each pressure sensor and outside the detected value of air-temperature sensor (231) infer and the electric weight of outdoor unit (11) do not illustrate among the figure.For example, when the difference of the detected value of each pressure sensor hour, because by the aperture control of supercooling with expansion valve (223), low pressure almost is maintained and immobilizes, therefore it is lower than usually to judge high-pressure, it is less with the refrigerant flow of the refrigerant loop (20) in the heat exchanger (210) to judge supercooling, as mentioned above.So, infer that the power consumption that about refrigerant loop (20) is less.And, when the difference of the detected value of each pressure sensor is big, judge high-pressure than high usually, it is also more with the refrigerant flow of the refrigerant loop (20) in the heat exchanger (210) to judge supercooling, as mentioned above.Therefore, infer that the power consumption that about refrigerant loop (20) is bigger.

(the 2nd embodiment)

The refrigerating plant (10) of this 2nd embodiment, by allowing supercooling increase with the operating frequency of the outdoor fan (230) of outdoor heat converter (222), reduce the power consumption of supercooling with compressor (221), replace above-mentioned the 1st embodiment directly to allow supercooling stop, reducing the power consumption of this supercooling with compressor (221) with the running of compressor (221).That is to say that in the present embodiment, supercooling immobilizes with the operating frequency of compressor (221).

Specifically, controller (240) when the supercooling degree of the cold-producing medium of refrigerant loop (20) is big, infers that the power consumption that about refrigerant loop (20) is less, does not allow the operating frequency of outdoor fan (230) change.And controller (240) has served as cooling degree hour, infers that the power consumption that about refrigerant loop (20) is bigger, allows the operating frequency of outdoor fan (230) increase and is big air quantity.So, supercooling reduces with the high-pressure of the supercooling in the refrigerant loop (220) with cold-producing medium.That is to say that supercooling reduces with the ejection pressure of compressor (221).Therefore, use in the compressor (221) in supercooling, because the minimizing of compression work amount, so power consumption reduces.Its result, even and between the refrigerant loop (20) do not carry out giving and accepting of signal etc., also can be according to the running of the operating condition of refrigerant loop (20) control supercooling with compressor (221), can make the electric weight of outdoor unit (11) and supercooling being aggregated in the limits value with the electric weight of compressor (221).

In addition, in the present embodiment, though after allowing the operating frequency of outdoor fan (230) increase, the power consumption of outdoor fan (230) increases, but supercooling is far longer than its increase with the reduction of the power consumption in the compressor (221), can positively reduce the power consumption of supercooling unit (200).And, in each variation of above-mentioned the 1st embodiment, if infer that the power consumption that refrigerant loop (20) is bigger, then with the above-mentioned the same control room external fan (230) that turns round.

(the 3rd embodiment)

The refrigerating plant (10) of this 3rd embodiment is made of the chilled(cooling) water return (CWR) of flow of cooling water, replaces being made of with the refrigerant loop that cold-producing medium circulates in cooling off with fluid circuit supercooling in above-mentioned the 1st embodiment, does not illustrate among the figure.Specifically, this chilled(cooling) water return (CWR) comprises supercooling with heat exchanger (210) and pump, the cooling water of cooling tower by this pump conveyance to supercooling usefulness heat exchanger (210).And, to use in the heat exchanger (210) in above-mentioned supercooling, the cold-producing medium heat exchange of cooling water and refrigerant passage (205) is with this refrigerant cools.That is to say that use in the fluid circuit in the cooling of present embodiment, cooling water flows with fluid as cooling.

At this moment, controller (240), the running capacity of regulating pump according to the supercooling degree and the outer temperature degree of the cold-producing medium of refrigerating plant (10).Specifically, controller (240) has served as cooling degree when big, does not allow the operating frequency of pump change.And, served as cooling degree hour, allow the operating frequency of pump reduce, reduce the running capacity of pump.So, can allow the power consumption of pump reduce.Its result, though and refrigerant loop (20) between do not carry out giving and accepting of signal etc., also can the electric weight of whole freezing device (10) can be suppressed in the limits value according to the running of the operating condition control pump of its refrigerant loop (20).

(the 4th embodiment)

The refrigerating plant (10) of this 4th embodiment, by the preferential power consumption that increases supercooling unit (200) when load increases, the power consumption that suppresses whole freezing device (10), replace above-mentioned the 1st embodiment by reducing the power consumption of supercooling with compressor (221), limit the power consumption of supercooling unit (200), suppress the power consumption of whole freezing device (10).

Specifically, the outer temperature degree Ta of the detected value of air-temperature sensor (231) and be the liquid refrigerant outlet temperature Tout of the detected value of outlet side refrigerant temperature sensors (237) outside the controller (240) of present embodiment is input as.And controller (240) decides according to above-mentioned outer temperature degree Ta and to continue supercooling with the running of compressor (221) or stop.That is to say, in the present embodiment, outer temperature degree Ta is used as the ambient conditions of supercooling with heat exchanger (210).

Control action to this controller (240) is illustrated.

As shown in Figure 6, be set with target liq refrigerant outlet temperature Eom as preprepared desired value.According to this target liq refrigerant outlet temperature Eom, controller (240) the control supercooling running capacity of compressor (221).This target liq refrigerant outlet temperature Eom is set to along with outer temperature degree Ta uprises and step-down.

Specifically, target liq refrigerant outlet temperature Eom, when outer temperature degree Ta is 25 ℃≤Ta≤40 ℃, Eom=-(Ta-40)+10 ℃.And, during Ta＜25 ℃, Eom=25 ℃ (immobilizing), during Ta＞40 ℃, Eom=10 ℃ (immobilizing).

Secondly, utilize Fig. 7 that the supercooling of controller (240) control with the running capacity of compressor (221) is illustrated.

At first, supercooling is the frequency of defined with the frequency of compressor (221).And in step S1, controller (240) calculates liquid refrigerant outlet temperature Tout and target liq refrigerant outlet temperature Eom poor (Tout-Eom), when this difference during less than-1.0 ℃ (regional A of Fig. 7), transfers to step S2.And, when this difference is more than-1.0 and is discontented with 1.0 (with the area B of figure), finish.And, when this difference surpasses-1.0 ℃ (with zone C of figure), transfer to step S4.

In step S2, controller (240) judges whether supercooling is low-limit frequency with the frequency of compressor (221).And, if low-limit frequency just finishes, if not low-limit frequency is just transferred to step S3.

In step S3, make the one-level of supercooling with the frequency reduction defined of compressor (221), finish.

And in step S4, judge whether supercooling is highest frequency with the frequency of compressor (221).And, if highest frequency just finishes, if not highest frequency is just transferred to step S5.

In step S5, make the one-level of supercooling with the frequency increase defined of compressor (221), finish.

Controller (240) was that unit carries out said procedure with 30 seconds.

So, along with outer temperature degree Ta uprises, controller (240) is set target liq refrigerant outlet temperature Eom lower.And, in order to allow liquid refrigerant outlet temperature Tout, must allow supercooling use the operating frequency of compressor (221) to rise near lower target liq refrigerant outlet temperature Eom, further increase running capacity.Therefore, in the present embodiment, when because of outside the rising of temperature degree Ta, when the load of refrigerating plant (10) increased, controller (240) allowed supercooling preferentially increase with the running capacity of compressor (221) by regulating target liq refrigerant outlet temperature Eom.Its result, supercooling increases with the power consumption of compressor (221), and supercooling preferentially increases with the power consumption of refrigerant loop (220).

In addition, in the supercooling unit (200) of present embodiment, though when the difference of liquid refrigerant outlet temperature Tout and target liq refrigerant outlet temperature Eom is more than 1.0 ℃ or 1.0 ℃ the time, allow supercooling change by controller (240) with the running capacity of compressor (221), but also can have ± during 1.5 ℃ and ± 2.0 ℃ poor, allowing its variation.

(effect of the 4th embodiment)

As mentioned above, in the supercooling evaporating temperature of the supercooling of heat exchanger (210), be higher than the evaporating temperature of the cold-producing medium in utilizing side heat exchanger (101,111,131) with cold-producing medium.At the height pressure reduction of kind of refrigeration cycle of supercooling, less than height pressure reduction in the kind of refrigeration cycle of refrigerant loop (20) with refrigerant loop (220).And, the refrigerating plant of present embodiment (10), for not being allows circulating mass of refrigerant increase in the bigger refrigerant loop of the height pressure reduction of kind of refrigeration cycle (20), but allow supercooling increase in refrigerant loop (220) with the internal circulating load of cold-producing medium in the littler supercooling of the height pressure reduction of kind of refrigeration cycle, and allow supercooling increase with the operating frequency of compressor (221), preferentially increase its power consumption (workload).That is to say that the running capacity by the less supercooling usefulness compressor (221) of the original burden of preferential increase comes the increase corresponding to load.Therefore, can suppress decline that can the rejection coefficient for increase corresponding to the required input of increase of load.Its result can suppress the increase of the power consumption of whole freezing device (10).

And, in the present embodiment,,, allow supercooling preferentially increase with the running capacity of compressor (221) with respect to heat source side compressor (41,42,43) along with outer temperature degree uprises.So, since can according to the variation of the height pressure reduction of the corresponding kind of refrigeration cycle of outer temperature degree, allow supercooling preferentially increase with the running capacity of compressor (221), therefore can the easier and decline of the coefficient of performance of freezing-inhibiting device (10) effectively, can suppress the recruitment of whole power consumption.

Each variation of-Di 4 embodiment-

Each variation (the 1st variation～the 6th variation), for according to the ambient conditions of the various parameters beyond the outer temperature degree, set the example of supercooling with the desired value of the refrigerant temperature in the outlet of heat exchanger (210) as supercooling usefulness heat exchanger (210).

-Di 1 variation-

In this 1st variation, will use the supercooling degree of the cold-producing medium of the refrigerant loop (20) that flows in the heat exchanger (210) to use the ambient conditions of heat exchanger (210) as supercooling in supercooling.At this moment, the temperature sensor of the Temperature Detector that the supercooling in refrigerant passage (205) is provided as cold-producing medium with the entrance side and the outlet side of heat exchanger (210) does not illustrate among the figure.The detected temperatures of these temperature sensors is transfused to controller (240), and its detected temperatures difference is used as the supercooling degree.And, in controller (240), come target setting liquid refrigerant outlet temperature Eom according to the supercooling degree of cold-producing medium.That is to say that along with the supercooling degree diminishes, infer that load increases, Eom sets lowlyer with target liq refrigerant outlet temperature.

-Di 2 variation-

In the refrigerating plant (10) of this 2nd variation, will use the refrigerant flow of the refrigerant loop (20) that flows in the heat exchanger (210) as the ambient conditions of supercooling in supercooling with heat exchanger (210).At this moment, be provided as the flow sensor of the flow detector of cold-producing medium, do not illustrate among the figure, should detect flow and be input to controller (240) in refrigerant passage (205).And, in controller (240), according to refrigerant flow target setting liquid refrigerant outlet temperature Eom.That is to say that along with refrigerant flow becomes many, infer that load increases, Eom sets lowlyer with target liq refrigerant outlet temperature.

-Di 3 variation-

In the refrigerating plant (10) of this 3rd variation, supercooling is used as the ambient conditions of supercooling with heat exchanger (210) with the supercooling in the heat exchanger (210) with the temperature difference before and after the supercooling of cold-producing medium.At this moment, be provided as the temperature sensor of supercooling with the entrance side of heat exchanger (210) and outlet side, do not illustrate among the figure with the Temperature Detector of cold-producing medium in supercooling.The detected temperatures of these temperature sensors is input to controller (240), its detected temperatures difference is used the temperature difference of the supercooling front and back of cold-producing medium as supercooling.And, in controller (240), according to the temperature difference target setting liquid refrigerant outlet temperature Eom of supercooling with cold-producing medium.That is to say that along with its temperature difference diminishes, infer that load increases, Eom sets lowlyer with target liq refrigerant outlet temperature.

-Di 4 variation-

In the refrigerating plant (10) of this 4th variation, will use the supercooling of flowing in the heat exchanger (210) to use the flow of cold-producing medium in supercooling as the ambient conditions of supercooling with heat exchanger (210).At this moment, be provided as the flow sensor of supercooling with the entrance side of heat exchanger (210) or outlet side, do not illustrate among the figure, should detect flow and be input to controller (240) with the flow detector of cold-producing medium in supercooling.And, in controller (240), according to detecting flow set target liq refrigerant outlet temperature Eom.That is to say that along with its supercooling is many with the flow change of cold-producing medium, infer that load increases, Eom sets lowlyer with target liq refrigerant outlet temperature.

-Di 5 variation-

In the refrigerating plant (10) of this 5th variation, supercooling is used the ambient conditions of heat exchanger (210) as supercooling with the high-pressure of cold-producing medium with the supercooling in the refrigerant loop (220).At this moment, be provided as the pressure sensor of pressure detector with the ejection side of compressor (221), do not illustrate among the figure, this detected pressures is input to controller (240) in supercooling.And, in controller (240), according to detected pressures target setting liquid refrigerant outlet temperature Eom.That is to say that along with the high-pressure of its supercooling with cold-producing medium uprises, infer that load increases, Eom sets lowlyer with target liq refrigerant outlet temperature.

-Di 6 variation-

In the refrigerating plant (10) of this 6th variation, supercooling is used as the ambient conditions of supercooling with heat exchanger (210) with the supercooling in the refrigerant loop (220) with the high-pressure of cold-producing medium and the pressure differential of low pressure.At this moment, with the pressure sensor that the spout side and the suction side of compressor (221) is provided as pressure detector, do not illustrate among the figure, those detected pressures are input to controller (240) in supercooling.And, in controller (240), according to the pressure differential target setting liquid refrigerant outlet temperature Eom of each detected pressures.That is to say that along with its pressure differential becomes big, infer that load increases, Eom sets lowlyer with target liq refrigerant outlet temperature.

(the 5th embodiment)

The refrigerating plant (10) of this 5th embodiment, by allowing supercooling increase with the operating frequency of the outdoor fan (230) of outdoor heat converter (222), supercooling is increased with the power consumption of refrigerant loop (220), replace above-mentioned the 4th embodiment directly to make the operating frequency rising of supercooling, this supercooling is increased with the power consumption of compressor (221) with compressor (221).That is to say, in the present embodiment,, also do not allow supercooling change with the operating frequency of compressor (221) even load increases.

Specifically, if allow the operating frequency of above-mentioned outdoor fan (230) increase, then supercooling increases with the flow of the supercooling in the heat exchanger (210) with cold-producing medium, and refrigerating capacity increases.That is to say, if the words that allow the operating frequency of outdoor fan (230) increase, then supercooling reduces with the high-pressure of the supercooling in the refrigerant loop (220) with cold-producing medium, and supercooling improves with the volume efficiency of compressor (221), and the internal circulating load of cold-producing medium increases.Therefore, liquid refrigerant outlet temperature Tout reduces.Its result, the power consumption of outdoor fan (230) increases, and supercooling preferentially increases with the power consumption of refrigerant loop (220).

In addition, in the present embodiment, though, its power consumption is reduced for supercooling is improved with the running efficiency of compressor (221), but the increase of the power consumption of outdoor fan (230) is extremely big, and therefore the power consumption of whole supercooling unit (200) rises really.

At present embodiment, the control action of controller (240) is as follows.In the step S2 of Fig. 6, judge whether the frequency of outdoor fan (230) is low-limit frequency.And,,, then transfer to step S3 if be not low-limit frequency if low-limit frequency then finishes.In step S3, the frequency of outdoor fan (230) is reduced the one-level of defined, finish.

And in step S4, judge whether the frequency of outdoor fan (230) is highest frequency.And,,, then transfer to step S5 if be not highest frequency if highest frequency then finishes.In step S5,, finish the one-level of supercooling with the frequency increase defined of compressor (221).Controller (240) was that unit carries out above-mentioned degree with 30 seconds.

So, when because of outside the rising of temperature degree Ta, when the load of refrigerating plant (10) increased, controller (240) allowed the running capacity of outdoor fan (230) preferentially increase by regulating target liq refrigerant outlet temperature Eom.Its result, supercooling preferentially increases with the power consumption of refrigerant loop (220), has suppressed the recruitment of the power consumption of whole freezing device (10).Other structure, effect and effect are the same with the 4th embodiment.

(the 6th embodiment)

The refrigerating plant (10) of this 6th embodiment uses the chilled(cooling) water return (CWR) by flow of cooling water to constitute, and replaces being made of with the refrigerant loop that cold-producing medium circulates in cooling off with fluid circuit supercooling in above-mentioned the 1st embodiment, does not illustrate among the figure.Specifically, this chilled(cooling) water return (CWR) comprises supercooling heat exchanger (210) and pump, and the cooling water of cooling tower is arrived supercooling heat exchanger (210) by this pump by conveyance.And, to use in the heat exchanger (210) in above-mentioned supercooling, the cold-producing medium heat exchange of cooling water and refrigerant passage (205) is with this refrigerant cools.That is to say that use in the fluid circuit in the cooling of present embodiment, cooling water flows with fluid as cooling.

At this moment, controller (240) when the load of refrigerating plant (10) increases, allows the running capacity of pump increase, so that liquid refrigerant outlet temperature Tout becomes target liq refrigerant outlet temperature Eom.Its result, the power consumption of pump increases, and preferentially increases about the power consumption of chilled(cooling) water return (CWR), has suppressed the recruitment of the power consumption of whole freezing device (10).Other structure, effect and effect and the 4th

Embodiment is the same.

In addition, the foregoing description and variation thereof, for be suitable for example of the present invention in nature, the present invention does not painstakingly limit its suitable thing or its purposes scope.

(practicality)

As mentioned above, the present invention is to using in the heat exchanger the overcooled freezing dress of cold-producing medium in supercooling Be equipped with usefulness.

Claims (23)

1, a kind of refrigerating plant comprises: have the side of utilization heat exchanger (101,111,131) and heat source side compressor (41,42,43), allow cold-producing medium circulate and carry out the refrigerant loop (20) that steam compression type refrigerating circulates; And has supercooling with heat exchanger (210) with will cool off with the fluid conveyance to the cooling fluid circuit (220) of this supercooling with the pump machanism (221) of heat exchanger (210), this refrigerating plant will offer the above-mentioned cold-producing medium that utilizes side heat exchanger (101,111,131) in above-mentioned supercooling supercooling in the heat exchanger (210) by cooling with fluid, it is characterized in that:

Comprise controller (240), according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in above-mentioned supercooling or cooling with the cooling of fluid circuit (220) with fluid state and outside the temperature degree reduce the power consumption of said pump mechanism (221).

2, refrigerating plant according to claim 1 is characterized in that:

Above-mentioned controller (240), constitute according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in supercooling or cooling with the cooling of fluid circuit (220) with fluid state and outside the temperature degree, infer power consumption, reduce the power consumption of said pump mechanism (221) about refrigerant loop (20).

3, refrigerating plant according to claim 1 is characterized in that:

Above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates;

Above-mentioned controller (240), constitute according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in above-mentioned supercooling or supercooling with the supercooling of refrigerant loop (220) with refrigerant condition and outside the temperature degree, reduce the operating frequency of above-mentioned supercooling, reduce the power consumption of this supercooling with compressor (221) with compressor (221).

4, refrigerating plant according to claim 1 is characterized in that:

Above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates;

Above-mentioned controller (240), constitute according to the refrigerant condition of the refrigerant loop (20) that flows in heat exchanger (210) in above-mentioned supercooling or supercooling with the supercooling of refrigerant loop (220) with refrigerant condition and outside the temperature degree, increase the operating frequency of the fan (230) of above-mentioned heat source side heat exchanger (222), reduce the power consumption of above-mentioned supercooling with compressor (221).

5, refrigerating plant according to claim 1 and 2 is characterized in that:

The refrigerant condition of the refrigerant loop (20) that flows in above-mentioned supercooling usefulness heat exchanger (210) is the supercooling degree of supercooling with the cold-producing medium of the refrigerant loop (20) in the heat exchanger (210).

6, refrigerating plant according to claim 1 and 2 is characterized in that:

The refrigerant condition of the refrigerant loop (20) that flows in above-mentioned supercooling usefulness heat exchanger (210) is for using the refrigerant flow of the refrigerant loop (20) that flows in the heat exchanger (210) in supercooling.

7, refrigerating plant according to claim 1 and 2 is characterized in that:

Above-mentioned cooling is with the cooling fluid state of fluid circuit (220), for supercooling with heat exchanger (210) in the cold-producing medium supercooling of refrigerant loop (20) before and the supercooling cooling afterwards temperature difference of fluid.

8, refrigerating plant according to claim 1 and 2 is characterized in that:

Above-mentioned cooling is with the cooling fluid state of fluid circuit (220), for use the cooling of flowing in the heat exchanger (210) flow of fluid in supercooling.

9, refrigerating plant according to claim 1 and 2 is characterized in that:

Above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates;

The supercooling refrigerant condition of above-mentioned supercooling usefulness refrigerant loop (220) is the high-pressure of supercooling with the usefulness of the supercooling in the refrigerant loop (220) cold-producing medium.

10, refrigerating plant according to claim 1 and 2 is characterized in that:

Above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates;

The supercooling refrigerant condition of above-mentioned supercooling usefulness refrigerant loop (220) is the supercooling high-pressure of the supercooling usefulness cold-producing medium in the refrigerant loop (220) and the pressure differential of low pressure.

11, a kind of refrigerating plant comprises: have the side of utilization heat exchanger (101,111,131) and heat source side compressor (41,42,43), allow cold-producing medium circulate and carry out the refrigerant loop (20) that steam compression type refrigerating circulates; And has supercooling with heat exchanger (210) with will cool off with the fluid conveyance to the cooling fluid circuit (220) of this supercooling with the pump machanism (221) of heat exchanger (210), this refrigerating plant will offer the above-mentioned cold-producing medium that utilizes side heat exchanger (101,111,131) in above-mentioned supercooling supercooling in the heat exchanger (210) by cooling with fluid, it is characterized in that:

Comprise controller (240), control is about the power consumption of above-mentioned refrigerant loop (20) with about the power consumption of above-mentioned cooling with fluid circuit (220);

Above-mentioned controller (240) when load increases, with respect to above-mentioned refrigerant loop (20), preferentially allows increase about the power consumption of above-mentioned cooling with fluid circuit (220).

12, refrigerating plant according to claim 11 is characterized in that:

Above-mentioned controller (240), constitute control about the power consumption of above-mentioned cooling with fluid circuit (220), so that above-mentioned supercooling becomes desired value with the refrigerant temperature in the outlet of heat exchanger (210), and set above-mentioned desired value with the ambient conditions of heat exchanger (210) according to supercooling, so that when load increases, preferentially allow increase about the power consumption of above-mentioned cooling with fluid circuit (220).

13, refrigerating plant according to claim 11 is characterized in that:

Above-mentioned controller (240) constitutes by allowing the power consumption of pump machanism (221) increase, and preferentially allows increase about the power consumption of cooling with fluid circuit (220).

14, refrigerating plant according to claim 13 is characterized in that:

Above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates;

Above-mentioned controller (240) constitutes by allowing above-mentioned supercooling increase with the operating frequency of compressor (221), allows this supercooling increase with the power consumption of compressor (221).

15, refrigerating plant according to claim 11 is characterized in that:

Above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates;

Above-mentioned controller (240) constitutes the operating frequency by the fan (230) that increases above-mentioned heat source side heat exchanger (222), preferentially allows increase about the power consumption of above-mentioned supercooling with refrigerant loop (220).

16, refrigerating plant according to claim 12 is characterized in that:

Above-mentioned supercooling is outer temperature degree with the ambient conditions of heat exchanger (210).

17, refrigerating plant according to claim 12 is characterized in that:

Above-mentioned supercooling is the supercooling degree of this supercooling with the cold-producing medium of the refrigerant loop (20) in the heat exchanger (210) with the ambient conditions of heat exchanger (210).

18, refrigerating plant according to claim 12 is characterized in that:

Above-mentioned supercooling is with the ambient conditions of heat exchanger (210), for use the refrigerant flow of the refrigerant loop (20) that flows in the heat exchanger (210) in this supercooling.

19, refrigerating plant according to claim 12 is characterized in that:

Above-mentioned supercooling is with the ambient conditions of heat exchanger (210), for this supercooling with heat exchanger (210) in the cold-producing medium supercooling of refrigerant loop (20) before and cooling after the supercooling use the temperature difference of fluid with the cooling of fluid circuit (220).

20, refrigerating plant according to claim 12 is characterized in that:

Above-mentioned supercooling is used the flow of fluid with the ambient conditions of heat exchanger (210) for use the cooling of flowing in the heat exchanger (210) in this supercooling with the cooling of fluid circuit (220).

21, refrigerating plant according to claim 12 is characterized in that:

Above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates;

The ambient conditions of above-mentioned supercooling usefulness heat exchanger (210) is the high-pressure of supercooling with the usefulness of the supercooling in the refrigerant loop (220) cold-producing medium.

22, refrigerating plant according to claim 12 is characterized in that:

Above-mentioned cooling fluid circuit is to have as the supercooling of pump machanism with compressor (221) and heat source side heat exchanger (222), circulates with cold-producing medium with the supercooling of fluid as cooling and carries out the supercooling usefulness refrigerant loop (220) that steam compression type refrigerating circulates;

The ambient conditions of above-mentioned supercooling usefulness heat exchanger (210) is the supercooling high-pressure of the supercooling usefulness cold-producing medium in the refrigerant loop (220) and the pressure differential of low pressure.

23, refrigerating plant according to claim 16 is characterized in that:

Above-mentioned controller (240) constitutes along with outer temperature degree uprises and above-mentioned desired value is reduced.

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