JP2010216777A - Refrigerating machine, and refrigerating and air-conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating machine, and a refrigerating and air-conditioning system including the same, capable of being properly operated even when a plurality of evaporators are connected to one compressor and one condenser. <P>SOLUTION: In this refrigerating machine R including the compressor 4, the condenser 2 and an evaporating section 10, the evaporating section 10 has the plurality of evaporators 11, 12 disposed in parallel with each other, and the evaporators 11, 12 are constituted to be communicatable to each other. This refrigerating and air-conditioning system includes the refrigerating machine R, a heat storage tank 7 storing cold of cooled brine, an air conditioner 5 cooling the air by heat exchange between the cooled cold water and the air, a heat exchanger 6 cooling the cold water introduced to the air conditioner by the cold stored in the heat storage tank 7, a first cold water circulation flow channel C1, a second cold water circulation flow channel C2, and a cold water flow channel control mechanism for controlling a circulation state of the cold water to each of the cold water circulation flow channels C1, C2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a refrigerator and a refrigeration air conditioning system, and more particularly, to a turbo chiller having a plurality of evaporators and a refrigeration air conditioning system using the same.

  Conventionally, there is a refrigerating and air-conditioning system in which cold water is introduced into an evaporator of a refrigerator and cooled, and the cooled cold water is introduced into an air conditioner for air conditioning. Further, as shown in FIG. 3, a heat storage tank 7 'and a heat exchanger 6' are arranged between the refrigerator R 'and the air conditioner 5', and brine is introduced into the evaporator 12 'of the refrigerator R'. There is also a refrigerating and air-conditioning system in which the cooled brine is introduced into the heat storage tank 7 'to store heat, and air conditioning is performed by the cold storage heat during air conditioning.

  By the way, although brine has a higher heat storage efficiency than water, the fluid itself has a low thermal conductivity. Therefore, when air conditioning is performed in a state where there is no cold storage heat, a brine having a low thermal conductivity is cooled to indirectly perform air conditioning, resulting in poor operating efficiency. That is, when taking out the same amount of refrigeration heat, the power consumption increases.

  Here, a cold water cooling refrigerator and a brine cooling refrigerator are provided for the same air conditioner one by one, and air conditioning is normally performed using cold storage heat, and cold water is stored when there is no cold storage heat. However, there is a problem that the cost of the air conditioning equipment increases and a problem that a large installation area is required.

  In order to solve such problems, there has been proposed a refrigerator having one compressor and one condenser, and an evaporator for cooling cold water and an evaporator for brine cooling arranged in parallel ( For example, Patent Document 1). In this refrigeration air conditioning system, when cooling cold water, an evaporator for cooling cold water is used, and when cooling brine, an evaporator for cooling brine is used.

JP 2008-267775 A

  However, when a plurality of evaporators are connected to one compressor and condenser, the refrigerant from one evaporator to the other is caused by the pressure of each evaporator or the liquid level of the refrigerant liquid. There is a problem that the refrigerator cannot be operated satisfactorily. The thing of patent document 1 is not disclosing the solution regarding this point.

  Such a problem is not limited to the case where each evaporator is of a different type, such as for cooling cold water or for cooling brine, but also applies to the same type of evaporator.

  Accordingly, the present invention provides a refrigerator that can be operated satisfactorily even when a plurality of evaporators are connected to one compressor and a condenser, and a refrigerating air conditioner equipped with such a refrigerator. The purpose is to provide a system.

  A refrigerator according to the present invention is a refrigerator in which a refrigeration cycle is configured by sequentially connecting a compressor, a condenser, and an evaporator through piping, and the evaporator includes a plurality of evaporators arranged in parallel. Each evaporator is configured to be able to communicate with each other.

  In this way, by connecting the evaporators to each other as necessary, it is possible to prevent the refrigerator from being unable to operate satisfactorily due to a refrigerant bias or a difference in pressure in each evaporator. it can.

  Moreover, it is preferable that the said refrigerator is comprised so that the said each evaporator can be connected and the refrigerant | coolant liquid in each evaporator can be distribute | circulated. In this way, even if the refrigerant liquid in a specific evaporator becomes excessive or insufficient, for example, this state can be solved.

  Moreover, it is preferable that the said refrigerator is comprised so that the gas in each evaporator can be distribute | circulated by connecting each said evaporator. In this way, even if the pressure in a specific evaporator becomes too high or too low, this state can be eliminated.

  Moreover, it is preferable that each said evaporator is connected by piping provided with an opening-closing mechanism. In this way, it is possible to normally perform control such that the opening / closing mechanism is closed and the evaporators are shut off, and the opening / closing mechanism is opened and the evaporators communicate with each other as necessary.

  The evaporators are preferably connected to each other by a refrigerant liquid distribution pipe capable of circulating the refrigerant liquid in each evaporator and a gas distribution pipe capable of flowing a gas in each evaporator. If it does in this way, it can respond to the situation, such as abnormality of the quantity of a refrigerant liquid, and the abnormality of the pressure in each evaporator by the piping for refrigerant liquid distribution, or the pipe for gas distribution.

  Moreover, it is preferable that the said refrigerator is provided with the pump which sends a refrigerant | coolant liquid to the said piping for refrigerant | coolant liquid distribution | circulation. In this way, the refrigerant liquid can be quickly transported between the evaporators. In addition, for example, even if the pressure difference between the evaporators exceeds the pump head and transportation becomes impossible, if the gas distribution pipe is provided, the pressure difference is reduced by circulating the gas in each evaporator. The pump can be operated well by reducing the size.

  Moreover, it is preferable that the said evaporation part is comprised including the evaporator for cold water cooling which cools cold water, and the evaporator for brine cooling which cools a brine. In this way, it is possible to realize a refrigerating and air conditioning system in which air conditioning is performed using cold storage heat during normal times and air conditioning is performed using cold water when there is no cold storage heat using a single refrigerator.

  Moreover, it is preferable that the said refrigerator is provided with the refrigerant | coolant flow path control mechanism which controls the distribution channel of the refrigerant | coolant with respect to each said evaporator. In this way, it is possible to perform control such as selecting an evaporator to be used when operating the refrigerator or changing the operation amount for each evaporator.

  Specifically, the refrigerant channel control mechanism may be configured to switch the refrigerant channel so that the refrigerant flows through one of the evaporators. In addition, the refrigerant flow path control mechanism may be configured to adjust the ratio of refrigerant flowing through each evaporator.

  In the refrigeration air conditioning system according to the present invention, a compressor, a condenser, and an evaporation unit are sequentially connected by a pipe to form a refrigeration cycle, and the evaporation unit includes an evaporator and a brine for cooling cold water for cooling cold water. A refrigerating machine configured with a brine cooling evaporator that cools the evaporator, the evaporators being arranged in parallel and capable of communicating with each other, and a heat storage tank that stores the cold heat of the brine cooled by the refrigerating machine An air conditioner that cools the air by heat-exchanging the cooled cold water and air, a heat exchanger that cools the cold water introduced into the air conditioner by the cold heat stored in the heat storage tank, and the cold water cooling A first chilled water circulation passage formed between the evaporator and the air conditioner, a second chilled water circulation passage formed between the heat exchanger and the air conditioner, and the chilled water circulation flows. The flow of cold water to the road Characterized in that it comprises a cold water passage control mechanism Gosuru.

  In this way, by connecting the evaporators to each other as necessary, it is possible to prevent the refrigerator from being unable to operate satisfactorily due to a refrigerant bias or a difference in pressure in each evaporator. it can. Moreover, both the operation | movement which air-conditions using cold storage heat | fever, and the operation | movement which air-conditions by cold water are realizable by one refrigerator.

  The refrigerating and air-conditioning system includes a pipe from the evaporator for cooling cold water to the air conditioner and a pipe from the heat exchanger to the air conditioner joined at a front stage of the air conditioner, and the air conditioner It is preferable that a pipe from the air conditioner to the evaporator for cooling the cold water and a pipe from the air conditioner to the heat exchanger are branched at the rear stage of the air conditioner.

  In this way, the first chilled water circulation channel and the second chilled water circulation channel can be partially integrated, and an operation for performing air conditioning using cold storage heat and an operation for performing air conditioning with cold water can be performed. A possible refrigeration and air conditioning system can be realized with a compact structure.

  The cold water flow path control mechanism can switch between a state in which only cold water from the evaporator for cooling cold water is introduced into the air conditioner and a state in which only cold water from the heat exchanger is introduced into the air conditioner. preferable. If it does in this way, air conditioning can be performed normally using cold storage heat, and when there is no cold storage heat, it can air-condition with cold water.

  The cold water flow path control mechanism may adjust a ratio of the cold water flowing through the first cold water circulation flow path and the cold water flowing through each evaporator of the second cold water circulation flow path. If it does in this way, the operation which air-conditions using cold storage heat and the operation which air-conditions with cold water can be combined, and it can carry out simultaneously.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where several evaporators are connected with respect to one compressor and a condenser, the refrigerator which can be drive | operated favorably, and refrigeration air conditioning provided with such a refrigerator A system can be provided.

The figure which shows the refrigerator which concerns on one Embodiment of this invention. The figure which shows the refrigeration air conditioning system using the refrigerator which concerns on one Embodiment of this invention. The figure which shows the freezing air-conditioning system using the conventional freezer.

  An embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows the overall configuration of a refrigerator according to this embodiment. In FIG. 1, the refrigerator which concerns on this embodiment connects the compressor (turbo compressor) 4, the condenser 2, and the evaporation part 10 by piping sequentially, and comprises a refrigerating cycle. An intermediate cooler 3 that injects refrigerant gas into the compressor 4 is provided between the condenser 2 and the evaporator 10.

  The condenser 2 includes a heat exchanger 2X into which cooling water is introduced. In the condenser 2, cooling water is introduced from the cooling water introduction pipe 21 to the heat exchanger 2 </ b> X, and the refrigerant gas is cooled by this cooling water to become a refrigerant liquid. The cooling water that has cooled the refrigerant in the heat exchanger 2 </ b> X is led out by the cooling water lead-out pipe 22. The condenser 2 is provided with a liquid level detection sensor 2a as a liquid amount detection unit that detects the amount of refrigerant liquid.

  The intercooler 3 includes a liquid level detection sensor 3a as a liquid amount detection unit that detects the amount of refrigerant liquid. In addition, a refrigerant gas motor-operated valve 3 b is provided in a pipe from the intermediate cooler 3 to the compressor 4. The refrigerant gas motor-operated valve 3b is constituted by an on-off valve. Note that the intercooler 3 is not an essential component and may not be provided.

  In addition, an expansion valve 2 c is provided in the piping from the condenser 2 to the intermediate cooler 3. The expansion valve 2c is configured by a flow rate adjustment valve.

  Next, the evaporation unit 10 will be described. The evaporation unit 10 includes a plurality of evaporators (an evaporator 11 for cooling cold water and an evaporator 12 for cooling brine) arranged in parallel.

  The evaporator 11 for cooling cold water includes a heat exchanger 11X into which cold water is introduced. In the evaporator 11 for cooling cold water, cold water is introduced into the heat exchanger 11X from the cold water introduction pipe 13, and the refrigerant liquid is evaporated by this cold water to become refrigerant gas. The cold water cooled in the heat exchanger 11X is led out by the cold water lead-out pipe 14. The evaporator 11 for cooling cold water is provided with a liquid level detecting sensor 1a as a liquid amount detecting unit for detecting the liquid amount of the refrigerant liquid. Moreover, the evaporator 11 for cooling cold water is provided with a pressure sensor 1h as a pressure detector for detecting the internal pressure.

  The evaporator 12 for cooling the brine includes a heat exchanger 12X into which brine is introduced. In the evaporator 12 for cooling the brine, the brine is introduced from the brine introduction pipe 15 to the heat exchanger 12X, and the refrigerant liquid is evaporated by this brine to become refrigerant gas. The cold water cooled in the heat exchanger 12X is led out by the brine lead-out pipe 16. The brine cooling evaporator 12 is provided with a liquid level detection sensor 1b as a liquid amount detection unit for detecting the liquid amount of the refrigerant liquid. Moreover, the evaporator 12 for brine cooling is provided with an evaporator pressure sensor 1i as a pressure detector for detecting the internal pressure.

  As the brine, a liquid having high heat storage efficiency is used. The brine is preferably an antifreeze that does not freeze even at 0 ° C., but is not limited thereto.

  By the way, the brine cooling evaporator 12 has a larger volume (specifically, about twice the volume) than the cold water cooling evaporator 11. This is because brine requires less refrigerant for cooling because brine has a lower thermal conductivity than water. Accordingly, the brine cooling evaporator 12 is configured to be able to introduce a larger amount (specifically, about three times) of the refrigerant than the cold water cooling evaporator 11.

  The evaporators 11 and 12 are configured to communicate with each other. Specifically, the refrigerator R is configured to allow the refrigerant liquid in the evaporators 11 and 12 to flow by communicating the evaporators 11 and 12. In addition, the refrigerator R is configured to allow the gas in each of the evaporators 11 and 12 to flow by communicating the evaporators 11 and 12. More specifically, the evaporators 11 and 12 are connected by a gas distribution pipe 1j. The gas distribution pipe 1j is provided with an electric valve 1e for adjusting the evaporator pressure.

  Moreover, each evaporator 11 and 12 is connected by piping provided with an opening-and-closing mechanism. Specifically, the evaporators 11 and 12 are connected by refrigerant liquid circulation pipes 1k and 1l. The refrigerant liquid distribution pipe 1k is provided with a gate valve 3f between the evaporators 11 and 12, and a refrigerant transport pump 1g. Further, the refrigerant liquid circulation pipe 1 l is provided with a refrigerant transport pump 1 f and a gate valve 3 e between the evaporators 11 and 12.

  Note that only one refrigerant liquid circulation pipe may be provided, and in that case, a configuration in which a refrigerant transport pump capable of transporting the refrigerant in both directions is provided in the refrigerant liquid circulation pipe is considered. It is done. Further, when the refrigerant can be transported without using the refrigerant transport pump, the coolant transport pump may not be provided in the coolant liquid circulation pipe.

  Further, the refrigerant flow path from the condenser 2 (specifically, the intermediate cooler 3) to the compressor 4 branches on the upstream side of the evaporators 11 and 12, and on the downstream side of the evaporators 11 and 12. Join. A switching valve 3c and an electric valve 1c between the intermediate cooler 3 and the evaporator 11 for cooling cold water are provided in the refrigerant flow path passing through the evaporator 11 for cooling cold water, and the evaporator 12 for cooling brine is provided. A switching valve 3d and an electric valve 1d between the intermediate cooler 3 and the evaporator 12 for cooling the brine are provided in the refrigerant flow path passing through.

  In addition, the refrigerator R includes a refrigerant flow path control mechanism that controls a refrigerant flow path to each of the evaporators 11 and 12. Specifically, the refrigerant channel control mechanism switches the refrigerant channel so that the refrigerant flows through one of the evaporators 11 and 12. By this switching, the refrigerator R is switched between a refrigeration cycle for cooling with cold water and a refrigeration cycle for cooling with brine.

  Specifically, the refrigerant flow path control mechanism includes the switching valve 3c and the motor-operated valve 1c, the switching valve 3d and the motor-operated valve 1d, and when the refrigerant is circulated through the evaporator 11 for cooling cold water. When the switching valve 3c and the motor-operated valve 1c are opened and the switching valve 3d and the motor-operated valve 1d are closed, when the refrigerant is circulated through the brine cooling evaporator 12, the switching valve 3d and the motor-operated valve 1d are opened. The switching valve 3c and the motor operated valve 1c are closed. However, the valve to be closed is not limited to this as long as one of the two branched flow paths can be closed. Further, instead of providing the switching valve 3c and the motor-operated valve 1c, the switching valve 3d and the motor-operated valve 1d, a three-way valve may be used at a branch point of the pipe from the intermediate cooler 3 to each of the evaporators 11 and 12.

  Next, a refrigeration cycle when performing cooling operation using cold water will be described. Refrigerating capacity is obtained by circulating cold water through the evaporator 11 for cooling cold water and exchanging heat between the refrigerant of the evaporator 11 for cooling cold water and the cold water. At this time, the electric valve 1d and the switching valve 3d connected to the evaporator 12 for cooling the brine are closed. Further, the gate valve 3e, the gate valve 3f, and the motor-operated valve 1e are closed, and no brine is introduced into the evaporator 12 for cooling the brine.

  The refrigerant gas compressed by the compressor 4 is sent to the condenser 2. The refrigerant gas introduced into the condenser 2 is cooled to become a refrigerant liquid. The refrigerant liquid level of the condenser 2 is controlled by operating the expansion valve 2 c so as to be in an optimum position by a liquid level detection sensor 2 a provided in the condenser 2. Then, the refrigerant liquid flows into the intercooler 3 at an optimum flow rate. The refrigerant liquid level of the intercooler 3 is controlled by operating the switching valve 3c so as to be in the optimum position by the liquid level detection sensor 3a. Then, the refrigerant liquid flows into the cold water cooling evaporator 11 at an optimum flow rate. The refrigerant sent to the evaporator 11 for cooling cold water is sent to the compressor 4 through the open motor-operated valve 1c.

  Further, in the refrigeration cycle when the heat storage operation is performed using brine, the brine is circulated to the evaporator 12 for cooling the brine, and heat is exchanged between the refrigerant of the evaporator 12 for cooling the brine and the brine, thereby freezing. Ability is gained. At this time, the motor-operated valve 1c and the switching valve 3c connected to the evaporator 11 for cooling cold water are closed. The gate valves 3e, 3f, and 1e are closed, and cold water is not introduced into the evaporator 11 for cooling cold water.

  The operation from the compressor 4 to the condenser 2 and the intercooler 3 is the same as that in the case of performing the cooling operation using cold water. The electric valve 1d and the switching valve 3d are opened. The refrigerant that has flowed into the evaporator 12 for cooling the brine at an optimum flow rate is sent to the compressor 4 through the open motor-operated valve 1d.

  As described above, since the compressor 4, the condenser 2 and the intermediate cooler 3 in the cooling operation and the heat storage operation are common in the refrigerator system, two cooling operation units and two heat storage operation units are installed. It saves space compared to.

  By the way, when the refrigerant liquid level in the evaporators 11 and 12 is high at the time of start-up or during operation, the refrigerant is sucked into the compressor 4 in a liquid state and the liquid compression operation is performed, and the refrigerator may break down. On the other hand, when the refrigerant liquid level is low, the evaporation amount is reduced and a predetermined refrigerating capacity cannot be obtained. Therefore, the coolant level in the evaporator 11 or 12 during operation using the liquid level detection sensor 1a of the evaporator 11 for cooling cold water and the liquid level detection sensor 1b of the evaporator 12 for cooling brine is appropriate. Control the liquid level so that

  For example, if the refrigerant liquid level of the cold water cooling evaporator 11 becomes higher during the operation of the cold water cooling evaporator 11, the refrigerant transport pump 1g provided in the refrigerant liquid circulation pipe 1j is operated, and the refrigerant liquid is washed with brine. It is transported to the evaporator 12 for cooling. On the other hand, when the refrigerant liquid level of the evaporator 11 for cooling cold water becomes low, the refrigerant transport pump 1f is operated to transport the refrigerant liquid to the evaporator 11 for cooling cold water.

  Similarly, when the refrigerant liquid level of the brine cooling evaporator 12 becomes high during the operation of the brine cooling evaporator 12, the refrigerant transport pump 1f is operated to transport the refrigerant liquid to the cold water cooling evaporator 11. To do. When the refrigerant liquid level of the evaporator 12 for cooling the brine is lowered, the refrigerant transport pump 1g is operated to transport the refrigerant liquid to the evaporator 12 for cooling the brine.

  When each of the refrigerant transport pumps 1f and 1g is operated, the pipe 1k or 1l provided with the refrigerant transport pump 1f or 1g is opened, but the refrigerant transport pump is not operated. In order to prevent the movement of the refrigerant due to the difference in liquid level (liquid head), the gate valve 3e and the gate valve 3f are closed.

  Further, when the pressure difference between the evaporators 11 and 12 exceeds the lift of the refrigerant transport pumps 1f and 1g, the refrigerant cannot be transported and the liquid level in the evaporator 11 or 12 during operation is optimally maintained. Difficult to do. Therefore, when the pressure difference between the evaporators 11 and 12 is detected from the detection result of the pressure sensor 1h of the evaporator 11 for cooling cold water and the detection result of the pressure sensor 1i, the liquid level control as described above is performed. When the pressure difference between the evaporators 11 and 12 exceeds the head of the refrigerant transporting pump 1g or 1f, the electric valve 1e is opened and the pressure between the evaporators 11 and 12 is adjusted. Thereby, since the pressure difference between the evaporators 11 and 12 becomes small, it becomes possible to perform smooth refrigerant transport and achieve refrigerant level control.

  However, when the pressure difference between the evaporators 11 and 12 is equal to or less than the lift of the refrigerant transport pumps 1f and 1g, the evaporator pressure adjusting motor-operated valve 1e is closed between the evaporators 11 and 12. This is because one of the evaporators 11 and 12 that is in operation is at a low temperature inside, but the other evaporator 12 or 11 is at a high temperature inside. This is because when the piping 1j is opened, the temperatures of the evaporators 11 and 12 during operation rise, and the amount of heat is wasted, and the operation efficiency is lowered.

  In addition, there are various merits other than the above by being configured so that the evaporators 11 and 12 can communicate with each other. For example, when the cold water cooling evaporator 11 is in operation and the brine cooling evaporator 12 is stopped, the pressure of the cold water cooling evaporator 11 decreases and flows through the cold water cooling evaporator 11. If the temperature of the cold water is also lowered, the cold water may freeze and damage the heat exchanger 11X in the evaporator 11 for cooling the cold water. At this time, the refrigerant is supplied from the brine cooling evaporator 12 in which high-pressure, high-temperature refrigerant exists (for example, using the refrigerant transport pump 1f) to the cold water cooling evaporator 11 in operation. It transports to the evaporator 11 for cold water cooling. Then, the pressure of the evaporator 11 for cooling cold water rises and the temperature of the cold water also rises, so that the cold water can be prevented from freezing.

  Further, for example, when one of the evaporators 11 and 12 is operated and the other is stopped, no refrigerant is required for the stopped evaporator 11 or 12. Accordingly, the evaporators 11 and 12 are connected to each other so that the refrigerant liquid in the evaporators 11 and 12 can be circulated, so that the evaporators 11 and 12 that are not operated when the refrigerator R is started are operated. By moving the refrigerant to the evaporator 12 or 11, the amount of refrigerant to be sealed can be reduced, which is environmentally friendly and leads to cost reduction.

  Next, the refrigeration air conditioning system using the refrigerator R according to the present embodiment will be described with reference to FIG.

  In this refrigeration / air-conditioning system, a compressor 4, a condenser 2, and an evaporation unit 10 are sequentially connected by a pipe to form a refrigeration cycle. The evaporation unit 10 includes an evaporator 11 for cooling cold water and a brine for cooling cold water. Of the brine R cooled by the refrigerator R, each of which is arranged in parallel and capable of communicating with each other. The heat storage tank 7 for storing cold heat, the air conditioner 5 for cooling the cooled chilled water and air by heat exchange, and the cold water introduced into the air conditioner R by the cold heat stored in the heat storage tank 7 are cooled. Formed between the heat exchanger 6 to be cooled, the cold water cooling evaporator 11 and the air conditioner 5, and the first cold water circulation channel C 1 formed between the heat exchanger 6 and the air conditioner 5. Second cold water circulation channel C When, and a cold water passage control mechanism for controlling the flow state of the cold water the to each cold water circulation passage C1, C2.

  Specifically, the heat storage tank 7 is a liquid tank for storing brine. The brine is introduced into the evaporator 12 for cooling the brine from the heat storage tank 7 and cooled, and then returned to the heat storage tank 7. Further, the cooled brine in the heat storage tank 7 is introduced into the heat exchanger 6 through the cooling water introduction pipe 21, cools the cold water by heat exchange, and then passes through the cooling water outlet pipe 22 to the heat storage tank 7. Returned.

  The cold water flow path control mechanism switches between a state where only cold water from the evaporator 11 for cooling cold water is introduced into the air conditioner 5 and a state where only cold water from the heat exchanger 6 is introduced into the air conditioner 5. .

  Further, in this refrigeration and air conditioning system, a pipe 17 going from the evaporator 11 for cooling cold water to the air conditioner 5 and a pipe 18 going from the heat exchanger 6 to the air conditioner 5 join at the front stage of the air conditioner 5. In addition, a pipe 19 from the air conditioner 5 to the evaporator 11 for cooling the cold water and a pipe 20 from the air conditioner 5 to the heat exchanger 6 are provided so as to branch at a subsequent stage of the air conditioner 5. It is done.

  Here, in the conventional refrigeration air conditioning system shown in FIG. 3, the heat quantity of the brine cooled by the refrigerator R ′ is stored in the heat storage tank 7 ′. The brine and cold water from the heat storage tank 7 'exchange heat in the heat exchanger 6', and air conditioning is performed by the air conditioner 5 'using the cold water from the heat exchanger 6'. In the case of a general refrigerator R ′, the evaporator is composed of one piece. Therefore, there is also one type of fluid system that flows through the evaporator 12 '. For this reason, when the air-conditioning is required after the heat storage operation is completed (that is, the cooling energy is lost), the cooling operation must be performed through the brine. However, since brine has a lower thermal conductivity of the fluid itself than water, the heat transfer coefficient obtained is also lowered, resulting in poor operating efficiency. Further, the loss of the heat exchanger 6 'is added, and the efficiency of the entire system is further reduced.

  On the other hand, according to the refrigeration and air conditioning system shown in FIG. 2, a chilled water return control three-way valve 6 b is provided at the junction between the pipe 19 and the pipe 20, and a chilled water control three-way is provided at the junction between the pipe 17 and the pipe 18. A valve 6c is provided. The cold water return control three-way valve 6b and the cold water control three-way valve 6c function as the cold water flow path control mechanism.

  During normal heat storage operation, the refrigerator R uses the brine cooling evaporator 12 and the above-described system from the brine heat storage tank 7 to the air conditioner 5. When air conditioning is required after the heat storage operation is completed, the flow direction of the cold water is changed to the refrigerator R side using the cold water return control three-way valve 6b and the cold water control three-way valve 6c. The operation mode is also switched to use the evaporator 11 for cooling cold water. As a result, chilled water having a higher heat exchange rate than that of the brine flows directly into the air conditioner 5 without passing through the heat exchanger 6, so that the heat storage and cooling operation is performed more efficiently than in the case where only the brine 1 system is used. Is possible.

  As described above, according to the refrigerator and the refrigerating and air-conditioning system according to the present embodiment, a refrigerator that can be satisfactorily operated even when a plurality of evaporators are connected to one compressor and a condenser. And a refrigerating and air-conditioning system including such a refrigerator can be provided.

  Specifically, since the evaporator 12 that circulates brine during heat storage and the evaporator 11 that circulates cold water during other cooling operations can be used, high-efficiency operation during cold water operation other than heat storage operation can be performed. A refrigerator and a refrigeration / air conditioning system that can be provided can be provided. Further, it is possible to provide a refrigerator and a refrigerating and air-conditioning system that are low in cost and have a small installation area, compared to installing two refrigerators for brine and cold water.

  The refrigerating machine and the refrigerating and air-conditioning system according to the present invention are not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention.

  For example, in the above-described embodiment, it has been described that the plurality of evaporators includes the evaporator 11 for cooling cold water and the evaporator 12 for cooling brine, but are limited to those having different types of evaporators. However, both of them may be provided with a plurality of the same type of evaporators, such as an evaporator for cooling cold water or for cooling brine.

  The evaporator is not limited to two, and may be three or more.

  Moreover, although the said refrigerant | coolant flow path control mechanism demonstrated as what switches a refrigerant | coolant flow path so that a refrigerant | coolant may distribute | circulate through any one of each evaporator 11, 12, it is not limited to this, The ratio of the refrigerant flowing through the vessels 11 and 12 may be adjusted.

  The cold water flow path control mechanism switches between a state where only cold water from the evaporator 11 for cooling cold water is introduced into the air conditioner 5 and a state where only cold water from the heat exchanger is introduced into the air conditioner. Although described as a thing, it is not limited to this, You may adjust the ratio of the cold water which flows through the said 1st cold water circulation flow path C1, and the cold water which flows through the 2nd cold water circulation flow path C2. . If it does in this way, the operation (heat storage utilization operation) which performs air conditioning using cold storage heat and the operation which performs air conditioning with cold water can be performed simultaneously.

  In this case, for example, air conditioning is performed using cold stored heat and air is not cooled using cold water after the cold stored heat is lost, but air conditioning is performed using cold stored heat and air conditioning is performed using cold water. By using together, cold storage heat can be preserved. In addition, as a specific structure of such a cold water flow path control mechanism, a structure in which a flow rate adjusting valve is provided at a joint portion between the pipe 19 and the pipe 20 and a joint portion between the pipe 17 and the pipe 18 can be considered.

  Further, the method of cooling the cold water in the heat exchanger 6 is not limited to the above-described one. For example, a heat medium different from the brine introduced into the evaporator 12 for cooling the brine is the heat exchanger 6. The cooling water may be indirectly cooled. Further, the heat exchanger 6 and the heat storage tank 7 may be configured integrally. In this case, for example, the heat exchanger 6 is provided in the heat storage tank 7, and the brine in the heat storage tank 7 is provided. A configuration for exchanging heat with cold water can be considered.

2 Condenser 3 Intermediate Cooler 4 Compressor 5 Air Conditioner 6 Heat Exchanger 7 Heat Storage Tank 10 Evaporator 11 Evaporator 11 for Cooling Water Cooling 12 Brine Cooling Evaporator 13 Cold Water Introducing Pipe 14 Cold Water Deriving Pipe 15 Brine Introducing Pipe 16 Brine outlet piping 21 Cooling water inlet piping 22 Cooling water outlet piping

Claims (14)

In a refrigerator in which a refrigeration cycle is configured by connecting a compressor, a condenser, and an evaporation unit sequentially by piping,
The evaporation unit is configured to include a plurality of evaporators arranged in parallel,
Each said evaporator is comprised so that communication is mutually possible, The refrigerator characterized by the above-mentioned.   The refrigerator according to claim 1, wherein the evaporators are communicated with each other so that the refrigerant liquid in each evaporator can be circulated.   The refrigerator according to claim 1 or 2, wherein the evaporators are communicated with each other so that the gas in each evaporator can be circulated.   Each said evaporator is connected by piping provided with an opening-closing mechanism, The refrigerator as described in any one of Claims 1-3 characterized by the above-mentioned.   The evaporators are connected to each other by a refrigerant liquid distribution pipe capable of flowing a refrigerant liquid in each evaporator and a gas distribution pipe capable of flowing a gas in each evaporator. The refrigerator as described in any one of 1-4.   The refrigerating machine according to claim 5, wherein a pump for sending the refrigerant liquid is provided in the refrigerant liquid circulation pipe.   The said evaporation part is provided with the evaporator for cold water cooling which cools cold water, and the evaporator for brine cooling which cools a brine, It is comprised as described in any one of Claims 1-6 characterized by the above-mentioned. The refrigerator as described.   The refrigerating machine according to any one of claims 1 to 7, further comprising a refrigerant flow path control mechanism that controls a flow path of refrigerant to each of the evaporators.   The refrigerator according to any one of claims 1 to 8, wherein the refrigerant flow path control mechanism switches the refrigerant flow path so that the refrigerant flows through any one of the evaporators.   The refrigerator according to any one of claims 1 to 9, wherein the refrigerant flow path control mechanism adjusts a ratio of refrigerant flowing through each evaporator. A refrigeration cycle is configured by sequentially connecting a compressor, a condenser, and an evaporator through a pipe, and the evaporator is configured by an evaporator for cooling cold water that cools cold water and an evaporator for cooling brine that cools brine. And a refrigerator configured such that the evaporators are arranged in parallel and can communicate with each other;
A heat storage tank for storing the cold heat of the brine cooled by the refrigerator;
An air conditioner that cools air by exchanging heat between cooled cold water and air;
A heat exchanger for cooling the cold water introduced into the air conditioner by the cold energy stored in the heat storage tank;
A first cold water circulation passage formed between the evaporator for cooling cold water and an air conditioner;
A second cold water circulation passage formed between the heat exchanger and the air conditioner;
A refrigeration and air conditioning system comprising: a cold water flow path control mechanism for controlling a flow state of the cold water with respect to each of the cold water circulation flow paths.   A pipe from the evaporator for cooling the cold water to the air conditioner and a pipe from the heat exchanger to the air conditioner merge at the front stage of the air conditioner, and the evaporator for cooling the cold water from the air conditioner The refrigerating and air-conditioning system according to claim 11, wherein a pipe that goes to the pipe and a pipe that goes from the air conditioner to the heat exchanger branch off in a subsequent stage of the air conditioner.   The cold water flow path control mechanism switches between a state where only cold water from an evaporator for cooling cold water is introduced into the air conditioner and a state where only cold water from the heat exchanger is introduced into the air conditioner. The refrigerating and air-conditioning system according to claim 11 or 12.   The said cold water flow path control mechanism adjusts the ratio of the cold water which flows through a 1st cold water circulation flow path, and the cold water which flows through each evaporator of a 2nd cold water circulation flow path, It is characterized by the above-mentioned. refrigerator.

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