JP5595975B2 - Air conditioning piping system - Google Patents

Description

  The present invention relates to an air-conditioning piping system for supplying a heat medium such as cold water or hot water in an air-conditioning facility such as a building or a factory.

A plurality of air conditioners are installed in buildings such as office buildings where multiple stores and offices, etc., or buildings such as factories that require a temperature-controlled space in the production process. Is supplied with a heat medium such as cold water or hot water from a heat source device at a flow rate corresponding to the heat load of the room or zone that each air conditioner is responsible for, for cooling or heating.
FIG. 11 shows a conventional primary pump type air conditioning piping system 100 equipped with such an air conditioner. Here, a flow rate control method using a two-way valve (flow rate control valve) 105 is employed.

  A conventional primary pump type air conditioning piping system 100 includes a heat source device 101 such as a refrigerator or a boiler, a primary pump 102 that is located on the inlet side of the heat source device 101 and conveys a heat medium such as cold water or hot water, and a heat source. The heat medium forward main pipe 103 connected to the outlet side of the machine 101 to which the heat medium is fed, a plurality of heat medium forward pipes 104 branched from the heat medium forward main pipe 103, and the inlet side of each heat medium forward pipe The two-way valve 105 connected to the passage 104 and arranged in parallel with each other, and an air conditioner (hereinafter referred to as an air conditioner) that exchanges heat between the chilled water coil such as an AHU (air handling unit) and a fan coil unit, hot water coil, and processing air. 106, the heat medium return pipe 107 connected to the outlet side of each air conditioner 106, and the heat medium return pipe 107 are connected so as to merge, and the inlet side of the heat source machine 101 The connected heat medium return main pipe 108, the forward header 109 connected to the heat medium forward main pipe 103 upstream of the air conditioner 106 on the most heat source apparatus 101 side in the heat medium flow direction, and the most heat source apparatus 101 side A return header 110 connected to the heat medium return main pipe 108 on the downstream side in the heat medium flow direction from the air conditioner 106, and a bypass pipe 111 provided with a flow rate adjusting valve 112 to connect the forward header 109 and the return header 110. Have.

In this example, the heat control pipe line 104, the two-way valve 105, the air conditioner 106, and the heat medium return pipe 107 constitute a temperature control piping system.
The conventional primary pump type air conditioning piping system 100 is a primary pump 102, and each air conditioner is provided with a heat medium of a constant temperature which is returned after the temperature change by the air conditioner 106 and is temperature-controlled by the heat source device 101 on the multilayer floor. 106.
The primary pump 102 needs to send a large amount of heat medium to cope with the load of each air conditioner 106. Further, the primary pump 102 is responsible for the pressure loss of the heat source device 101 and the pressure loss of each pipe, the two-way valve 105 and the air conditioner 106.

  In each floor, the opening degree of the two-way valve 105 is adjusted in order to cope with the load fluctuation of the air conditioner 106. When the two-way valve 105 is throttled, the excess heat medium due to the restriction is not flown through the heat medium forward conduit 104 and, consequently, the heat medium forward main conduit 103, and the excess heat medium is bypassed from the forward header 109. It flows to the return header 110 via the pipe 111. At that time, the primary pump 102 continues to send the heat medium at the minimum flow rate of the heat source device 101 so that it can cope with load fluctuations without any trouble even if variable flow rate control can be performed. Then, an unnecessary heat medium is returned from the forward header 109 via the bypass conduit 111 to the header 110, and the remaining heat medium is transported to the heat source apparatus 101.

The reason why the heat source unit 101 returns to the heat source unit 101 without consuming the cold or hot heat of the heat medium in the bypass line 111 is that the heat source unit 101 is not able to follow the load due to freezing in the evaporator or activation of a protection circuit for preventing the freezing, and absorption. In the case of a type refrigerator, the heat medium flow rate of the heat source device 101 that should be secured at least is determined so as not to cause problems such as crystallization of the absorption liquid in the condenser or absorber, and in order to secure the flow rate is there.
In the conventional primary pump type air-conditioning piping system 100, for example, the heat medium can be sent to the top floor as shown in FIG. 13 in which the height distance of the building and the distance from the heat source device 101 are increased in the right direction. In order to secure the lift, the primary pump 102 has a large lift, and each floor of an office building or the like has substantially the same thermal load, and the thermal load carried by each air conditioner 106 is substantially the same, so that the temperature control piping on each floor Even if the pressure loss of the system is substantially the same, the lower-floor temperature control piping system close to the primary pump 102 is provided with a large lift conveying power as shown in FIG. The two-way valve 105 on the floor side is freed up.
Therefore, since the two-way valve 105 on the primary pump 102 side adjusts the flow rate with resistance, it is necessary to restrict the flow even at 100% load, and the power of the primary pump 102 is wasted.

FIG. 12 shows a conventional primary pump / secondary pump type air conditioning piping system 200 equipped with a similar air conditioner 106.
In the conventional primary pump secondary pump type air conditioning piping system 200, the primary pump 102 is responsible for the pressure loss of the heat source unit 101, and the secondary pump 201 is responsible for the load side pressure loss. A secondary pump 201 and a pressure control valve 202 are disposed between 109b.
Other configurations are the same as those of the conventional primary pump type air conditioning piping system 100.

In the conventional primary pump secondary pump type air conditioning piping system 200, for example, as shown in FIG. 14, in order to secure the head so that the heat medium can be sent to the top floor, the secondary pump 201 having a large head is obtained. Each floor of a building has substantially the same heat load, and the thermal load carried by each air conditioner 106 is substantially the same, so even if the pressure loss of the temperature control piping system on each floor is substantially the same, it is close to the secondary pump 201 As shown in FIG. 14, the lower-floor temperature control piping system is provided with a large lift conveying power and more heat medium than necessary, so that the two-way valve 105 on the lower floor side is throttled.
Therefore, since the two-way valve 105 on the secondary pump 201 side is attached with a resistance to adjust the flow rate, throttling is required even in the case of 100% load, and the power of the secondary pump 201 is wasted.

Therefore, the flow rate of the heat medium guided from the heat source device through the heat medium forward pipe line is controlled for each air conditioner according to the deviation between the indoor temperature measurement value and the set value for each air conditioner. It has been proposed to install an inverter-equipped pump in each air conditioner so that power saving can be achieved (for example, see Patent Document 1).
In addition, it has been proposed to install a pump with an inverter for each air conditioner and to install a check valve (back flow preventing means) on each heat medium forward pipe side (see, for example, Patent Document 2).

Japanese Patent No. 3490986 Japanese Patent No. 3708660

However, in the conveyance power reduction system in the air conditioning facility of Patent Document 1, since only the inverter-equipped pump for each air conditioner has the heat medium conveying means, the minimum flow rate of the refrigerator when the amount of cold water in the refrigerator is variable. In order to ensure it, the variable amount is usually about 100 to 50%, but each inverter pump throttles the flow according to the air conditioning load on the secondary side. There is a problem that it cannot be secured.
Also, when a pump with an inverter is stopped in only one system among a plurality of supply pipes, the pump with an inverter and the air conditioner where the heat medium is stopped by the conveying force of the pump with an inverter operating in another supply pipe There is a problem of backflowing into the machine.
Further, in the liquid piping facility of Patent Document 2, as shown in FIG. 12, when the secondary pump is provided as the primary pump secondary pump system, when only the temperature control piping system of the air conditioner near the secondary pump is stopped, Since the heat medium is fed in the forward direction by the transport force of the secondary pump, it cannot be stopped by the check valve, and the heat medium passes through the stopped temperature control piping system by the transport force of the secondary pump. That is, the amount of secondary pump conveyance power corresponding to that amount is wasted.

  The present invention has been made to solve such a conventional problem, and its purpose is to ensure a necessary flow rate according to the load regardless of the distance between the primary heat medium pump and the air conditioner. Is to provide a simple air conditioning piping system.

The invention according to claim 1 is provided with a three-way valve, a dispersion pump with an inverter, a thermometer, and an air conditioner in the heat medium forward line from the inlet side to the outlet side, and the heat medium return pipe on the outlet side of the air conditioner And a bypass pipe connecting the three-way valve and the heat medium return pipe, and independently air-conditioning the plurality of zones by exchanging heat between the heat medium and air independently by the air conditioner. A plurality of temperature control piping systems, a heat source device for supplying a heat medium adjusted in temperature to the plurality of temperature control piping systems by a conveying force of a dispersion pump with an inverter, and connected to an outlet side of the heat source device and the plurality of temperature controls A heat medium forward main pipe connected to the inlet side of the piping system, a heat medium return main pipe connected to the inlet side of the heat source device and connected to the outlet side of the plurality of temperature control piping systems, and the plurality of temperature control piping systems Outward side A forward header connected midway through the heat medium return main pipeline, a return header linked midway through the heat medium return main pipeline to the return side of the plurality of temperature control piping systems, the forward header and the return header A primary bypass pipe having a flow compensation pump with an inverter for securing a minimum flow rate of the heat source device, and a temperature of the heat medium from each thermometer, and a minimum temperature or a maximum temperature is set. A primary side control that has a temperature indicating controller that calculates based on a selector to be selected and a selector output signal and issues a signal for determining a heat medium set temperature of the heat source device, and that controls the rotation of the flow compensation pump with an inverter A secondary-side control device that performs rotation control of the inverter-equipped distributed pump and switching control of the three-way valve according to the load of the zone, During the rated operation of the air conditioner, the three-way valve is controlled so that the bypass pipe is closed, and the distributed pump with the inverter is operated, and during the partial load operation of the air conditioner, the load of the zone According to the control of the flow rate of the dispersion pump with the inverter, at the time of stopping the air conditioner, the dispersion pump with the inverter is stopped, and the three-way valve is controlled so as to close the heat medium forward main line side, The three-way valve is controlled so as to stop the inflow of the heat medium from the main flow path of the heat medium and open the bypass pipe, and the primary side control device has a constant number of the plurality of temperature control piping systems as described above. When the dispersion pump with the inverter is stopped, the flow compensation pump with the inverter is driven to ensure the minimum flow rate of the heat source device, and the plurality of temperature control distributions. In a state in which all of the pipe system is throttled the valve body connected to the upstream side of the heat medium going pipe of the three-way valve, the outlet heat medium set temperature of the heat source device is set to the temperature control piping system. Variable control is performed based on the lowest temperature or the highest temperature selected by a selector from thermometer measurement values.

The invention according to claim 2, in the air conditioning piping system according to claim 1, wherein the primary controller is a state in which a certain number of said plurality of temperature control piping system stops dispersing pump with the inverter, the heat Judgment is made based on the measured value of a flow meter provided in the medium return main pipeline, and the drive and rotation speed of the inverter-equipped flow compensation pump are controlled.

The invention according to claim 3 is provided with a three-way valve, a dispersion pump with an inverter, a thermometer, and an air conditioner in the heat medium forward line from the inlet side to the outlet side, and the heat medium return pipe on the outlet side of the air conditioner And a bypass pipe connecting the three-way valve and the heat medium return pipe, and independently air-conditioning the plurality of zones by exchanging heat between the heat medium and air independently by the air conditioner. A plurality of temperature control piping systems, a heat source device for adjusting the temperature of the heat medium supplied to the plurality of temperature control piping systems, and connected to an outlet side of the heat source device and on an inlet side of the plurality of temperature control piping systems A connecting heat medium forward main line, a heat medium return main line connected to an inlet side of the heat source device and connected to an outlet side of the plurality of temperature control piping systems, and the heat medium on the outgoing side of the plurality of temperature control piping systems Via the outgoing main line The return header connected in the middle via the heat medium return main line to the return side of the plurality of temperature control piping systems, the forward header and the return header via the inter-header flow control valve A bypass pipe between headers to be connected, and the heat source return main pipe in the vicinity of the heat source device, a heat medium return main pipe from the heat source device to the forward header, a heat medium return main pipe to the return header, and A primary pump with an inverter for transporting the heat medium having a head corresponding to the heat medium transport pressure loss of the heat source device and ensuring a minimum flow rate of the heat source device, and the heat medium from each thermometer A temperature indicating controller for inputting a temperature of the heat source, calculating a minimum temperature or a maximum temperature and calculating a heat medium set temperature of the heat source device by calculating based on a selector output signal and a selector output signal And a primary-side control device that performs rotation control of the primary pump with inverter, and a secondary-side control device that performs rotation control of the distributed pump with inverter and switching control of the three-way valve according to the load of the zone. The secondary-side control device controls the three-way valve so that the bypass pipe is closed during the rated operation of the air conditioner, and operates the distributed pump with an inverter. During load operation, the flow rate of the dispersion pump with inverter is controlled according to the load of the zone, and when the air conditioner is stopped, the dispersion pump with inverter is stopped, and the heat medium going main line side of the three-way valve is Controlling the three-way valve to stop the inflow of the heat medium from the heat medium outgoing main pipe line and to open the bypass pipe; and The primary side control device adjusts the flow rate of the primary pump with inverter while adjusting the flow rate of the primary pump with inverter while a certain number of the temperature control piping systems stop the distributed pump with inverter. In a state in which the minimum flow rate of the heat source device is controlled to ensure that all of the plurality of temperature control piping systems have throttled the valve body connected to the upstream side of the heat medium outlet line of the three-way valve, the heat source The outlet heat medium set temperature of the apparatus is variably controlled based on the minimum temperature or the maximum temperature selected by the selector from the thermometer measurement values of the plurality of temperature control piping systems.

The invention according to claim 4 is provided with a three-way valve, a dispersion pump with an inverter, a thermometer, and an air conditioner in the heat medium forward line from the inlet side to the outlet side, and the heat medium return pipe on the outlet side of the air conditioner And a bypass pipe connecting the three-way valve and the heat medium return pipe, and independently air-conditioning the plurality of zones by exchanging heat between the heat medium and air independently by the air conditioner. A plurality of temperature control piping systems, a heat source device for adjusting the temperature of the heat medium supplied to the plurality of temperature control piping systems, and connected to an outlet side of the heat source device and on an inlet side of the plurality of temperature control piping systems A connecting heat medium forward main line, a heat medium return main line connected to an inlet side of the heat source device and connected to an outlet side of the plurality of temperature control piping systems, and the heat medium on the outgoing side of the plurality of temperature control piping systems Via the outgoing main line In order to convey the heat medium to the plurality of temperature control piping systems, the forward header connected in the middle, the return header connected in the middle via the heat medium return main pipeline to the return side of the plurality of temperature control piping systems, With an inverter located in the downstream of the forward header of the heat medium forward main pipe having a head for the heat medium transport pressure loss of the heat medium return main pipe to the return header and the heat medium forward main pipe after the forward header A secondary pump, an inter-header bypass pipe that connects the forward header and the return header via a flow rate adjusting valve between headers, and the heat source return main pipe are located in the vicinity of the heat source apparatus, and from the heat source apparatus A heat medium forward main pipe to the forward header, a heat medium return main pipe to the return header, and a head for a heat medium transport pressure loss of the heat source device, and transporting the heat medium The primary pump with an inverter for ensuring the minimum flow rate of the heat source device and the temperature of the heat medium from each thermometer are input, and the calculation is performed based on the selector that selects the lowest temperature or the highest temperature and the selector output signal. A primary-side control device having a temperature indicating controller for generating a signal for determining a heat medium set temperature of the heat source device and performing rotation control of the primary pump with the inverter, and the dispersion with the inverter according to the load of the zone A secondary-side control device that controls the rotation of the pump and the switching control of the three-way valve, and the secondary-side control device closes the bypass pipe during the rated operation of the air conditioner. And controlling the valve and operating the dispersion pump with the inverter. During the partial load operation of the air conditioner, the dispersion pump with the inverter according to the load of the zone. The flow rate of the pump is controlled, and when the air conditioner is stopped, the dispersion pump with the inverter is stopped, and the heat medium going main line side of the three-way valve is closed and controlled from the heat medium going main line The three-way valve is controlled so as to stop the inflow of the heat medium and open the bypass pipe, and the primary control device has a certain number of the temperature control piping systems stopped the dispersion pump with inverter In the state, while adjusting the flow rate of the primary pump with the inverter, the opening of the flow rate adjusting valve between the headers is controlled to ensure the minimum flow rate of the heat source device, and all of the plurality of temperature control piping systems are the three-way valve In the state where the valve body connected to the upstream side of the heat medium outlet pipe is narrowed, the selector selects the outlet heat medium set temperature of the heat source device from the thermometer measurement values of the plurality of temperature control piping systems. Based on the minimum temperature or the maximum temperature was, and performs variable control.

  According to the present invention, in the case of using the total head handling system with a distributed pump with an inverter, the flow compensation pump with an inverter can ensure a minimum flow rate with a head only on the primary side between the forward header / return header and the heat source device. Therefore, since a heat medium having a required flow rate can be supplied by the distributed pump with an inverter according to the zone load on the air conditioner side, the energy of the distributed pump power with the inverter can be saved.

According to the present invention, each dispersion pump system is provided with a bypass composed of a three-way valve and a bypass pipe, so that the heat medium flow calculated from the zone load is defined from the minimum frequency of the inverter of the dispersion pump with the inverter. If the flow rate is less than the minimum flow rate to prevent burnout, the flow rate of the dispersion pump with inverter is kept constant at the minimum flow rate to prevent burnout, and the excess flow rate is returned by bypass circulation to reduce the amount of heat, and only the required heat amount of the heat medium is reduced. A bleed-in type load with a three-way valve can be secured.
And when the dispersion pump with an inverter takes the head of only the temperature control piping system, the flow rate in the dispersion pump system is ensured to be equal to or greater than the predetermined minimum burnout prevention flow rate, and the adjustment mechanism is a three-way valve. Because it is possible to eliminate the push-through of the heat medium into the temperature control piping system caused by the head of the pump provided in these main pipes regardless of the head of the primary pump with inverter or the secondary pump with inverter, the primary pump or inverter with inverter The waste of power of the attached secondary pump can be eliminated.

  According to the present invention, the heat medium temperature is measured in each dispersion pump system, and the temperature going to the load due to the heat medium mixing between the bypass and the heat medium going main pipe constituted by the three-way valve and the bypass pipe is the lowest value during cooling. When the temperature exceeds the maximum value during heating or below the maximum value during heating, control is performed to change the heat source device outlet heat medium temperature setting value of the central refrigerator, etc., so that the COP of the refrigerator is expected to improve. it can.

It is the schematic which shows the air-conditioning piping system which concerns on 1st embodiment of this invention. It is explanatory drawing which shows the proportional control and switching of the three-way valve in FIG. It is a figure which shows the relationship between the control output of the thermal load in FIG. 1, and the pump rotation speed or the air-conditioner inlet temperature of a heat medium. It is the schematic which shows the secondary side control apparatus by the side of the air-conditioning zone of the temperature control piping system in FIG. It is a figure which shows the structure which calculates | requires the minimum temperature or the maximum temperature in the temperature control piping system in FIG. It is a flowchart which calculates | requires the minimum temperature or the maximum temperature in the temperature control piping system in FIG. It is a figure which shows the relationship between the flow volume around the refrigerator in FIG. 1, the flow volume of the distributed pump side with an inverter in a temperature control piping system, and the flow volume of the flow compensation pump with an inverter. It is the schematic which shows the relationship between the pump with an inverter and air conditioner in the air-conditioning piping system in FIG. It is the schematic which shows the air-conditioning piping system which concerns on 2nd embodiment of this invention. It is the schematic which shows the air-conditioning piping system which concerns on 3rd embodiment of this invention. It is the schematic which shows the conventional air conditioning piping system. It is the schematic which shows another conventional air conditioning piping system. It is the schematic which shows the relationship between the pump head and pressure loss in the air-conditioning piping system shown in FIG. 11, and the distance from a heat-source apparatus. It is the schematic which shows the relationship between the head and pressure loss of a pump in the air-conditioning piping system shown in FIG. 12, and the distance from a heat-source apparatus. ”

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
(First embodiment)
FIG. 1 shows an air conditioning piping system 1 according to a first embodiment of the present invention.
This air-conditioning piping system 1 is a heat medium total head handling system using a distributed pump with an inverter, and is connected to two heat source devices 11 such as a refrigerator or a boiler and to the outlet sides of the two heat source devices 11, respectively. The regulating valve 12, the forward header 13 connected to the outlet side of the flow rate regulating valve 12, the return header 14 connected to the inlet side of the two heat source units 11, and the forward header 13 and the return header 14 are arranged. And a primary bypass pipe 15a having a flow compensation pump 15 with an inverter.
The flow rate compensation pump 15 with an inverter is installed to ensure the minimum flow rate of the two heat source units 11. The two heat source devices 11 and the flow rate adjusting valve 12 are connected to the refrigerator number control controller 40. The refrigerator number controller 40 is used to perform an automatic number control operation of a plurality of refrigerators by the amount of heat calculated from measured values of main pipe thermometers 38 and 39 and a flow meter 37 described later.

The forward header 13 is connected to a heat medium forward main pipe 16 that feeds the heat medium from the two heat source units 11 to a plurality of temperature control piping systems 20 described later. A main pipe thermometer 38 is provided in the vicinity of the outlet of the outgoing header 13 of the heat medium outgoing main pipe line 16.
The return header 14 is connected to a heat medium return main pipe 17 for transferring a heat medium from a plurality of temperature control piping systems 20 described later. A flow meter 37 is provided in the vicinity of the inlet of the return header 14 in the heat medium return main pipeline 17. The flow meter 37 is connected to a flow rate compensation pump control circuit 36 with an inverter provided with a flow rate regulator 35 and a calorimeter 40 that also captures measurement signals of main pipe thermometers 38 and 39. The flow compensation pump control circuit 36 with an inverter is connected to the inverter of the flow compensation pump 15 with an inverter. A main pipe thermometer 39 is provided in the vicinity of the return header inlet of the heat medium return main pipe line 17.

Each temperature control piping system 20 includes a three-way valve 21, an inverter-equipped dispersion pump 22, a thermometer 23, and an air conditioner 24 in the heat medium forward duct 18 from the inlet side toward the outlet side, and the outlet of the air conditioner 24. A temperature control piping system main pipe 20 a provided with a heat medium return pipe 19 on the side, and a bypass pipe 25 connecting the three-way valve 21 and the heat medium return pipe 19 are provided.
And each temperature control piping system 20 is mutually arrange | positioned in parallel with respect to the building in which this air-conditioning piping system 1 is installed between the heat-medium going main pipeline 16 and the heat-medium return main pipeline 17.
The inlet side of each three-way valve 21 is connected to a plurality of heat medium outgoing pipes 18 branched from the heat medium outgoing main pipe 16. Each bypass pipe 25 is connected to a heat medium return pipe 19 connected to the heat medium return main pipe 17, respectively.

For example, as shown in FIG. 2 (a), each three-way valve 21 opens the valves 21a and 21b and closes the valve 21c to supply the heat medium supplied from the heat medium forward pipe 18 to each temperature control pipe. The heat medium inflow pattern to flow down to the system main pipe 20a, and as shown in FIG. 2B, the valve 21a is squeezed and the valves 21b and 21c are opened and mixed with the heat medium from the bypass pipe 25 to each temperature. When the dispersion pump 22 with the inverter stops, as shown in FIG. 2 (c), and the heat medium mixing pattern in which the dispersion pump 22 with the inverter, the thermometer 23 and the air conditioner 24 are caused to flow down the control piping main pipe 20a. , And the heat medium stop pattern for closing the valve 21a and opening the valves 21b and 21c.
In the heat medium inflow pattern shown in FIG. 2A, according to the zone load on the air conditioner 24 side, the rated operation for rotating the dispersion pump 22 with the inverter at 100% rotation speed and the air conditioner 24 at a load close to the rating. With the reduction of the zone load on the side, the frequency of the commercial power supplied to the distributed pump 22 with the inverter is reduced, for example, from about 50 Hz to about 15 Hz, and the load that reduces the rotational speed of the distributed pump 22 with the inverter Immediately before the partial load operation and further reduction of the zone load proceed, the power frequency decreases to the lower limit, for example, about 15 Hz, and the rotational torque of the motor of the distributed pump 22 with the inverter becomes small and the rotation of the pump becomes difficult. The minimum rotational speed of the motor is reduced to the minimum rotational speed to prevent motor burnout.

In the heat medium mixing pattern shown in FIG. 2B, the rotational speed of the dispersion pump 22 with the inverter is decreased and the rotational torque of the motor of the dispersion pump 22 with the inverter is reduced as the zone load on the air conditioner 24 side is reduced. The heat medium that has been warmed or cooled by passing through the air conditioner 24 from the bypass pipe 25 while performing the minimum rotation operation for preventing motor burnout that is reduced to the minimum rotation speed just before the rotation of the pump becomes difficult. It is introduced from the valve 21c of the valve 21, mixed with the heat medium supplied from the temperature control piping system main pipe 20a, mixed with the heat medium before passing through the air conditioner 24 through the valve 21b, and taken into the air conditioner 24 again. Make it.
With this heat medium mixing pattern, for example, at the time of cooling, as shown in FIG. 3A, even when the zone load becomes too small and the rotation speed of the dispersion pump 22 with an inverter cannot be reduced, the temperature control piping main pipe 20a. The inlet temperature of the air conditioner 24 is increased by increasing the temperature of the heat medium flowing through the air. Therefore, the excessive cooling phenomenon in the air conditioning zone 26 is eliminated.

Further, for example, during heating, as shown in FIG. 3B, the rotational speed of the dispersion pump 22 with the inverter decreases, so that the temperature of the heat medium flowing through the temperature control piping system main pipe 20a decreases, and the air conditioner 24 The inlet temperature of the becomes lower. Therefore, the overheating phenomenon in the air conditioning zone 26 is eliminated.
Each thermometer 23 measures the temperature of the heat medium transferred from the dispersion pump 22 with an inverter to the air conditioner 24. Each thermometer 23 is connected to a selector 33 via an outgoing temperature transmission instrumentation line 32. The selector 33 receives an input signal from each of the plurality of thermometers 23, and when there is a signal exceeding a set threshold value, the selector 33 selects and sends it to the temperature regulator 34 as an input signal to the downstream temperature regulator 34. We communicate via instrumentation lines. The temperature regulator 34 communicates with the machine side panel of each of the two heat source machines 11 via an instrumentation line so that an input signal for changing the set value of the controller in the machine side panel flows.

  Each air conditioner 24 communicates with an air conditioning zone 26 such as an air conditioning target room to be air-conditioned by exchanging heat between the heat medium and air using a cooling coil or a heating coil provided in the air conditioner 24. The air conditioning zone 26 includes, for example, an indoor thermometer 27 and a hygrometer 28 as shown in FIG. The indoor thermometer 27 communicates with the indoor temperature controller 29, and the hygrometer 28 communicates with the humidity controller 30. The room temperature controller 29 and the humidity controller 30 communicate with the three-way valve 21 and the inverter-equipped dispersion pump 22 via a selector 31 via an instrumentation line.

The above configuration is the secondary side control device in the air conditioning zone 26. The operation of this secondary side control device is that only the control signal from the indoor temperature controller 29 is selected by the selector 31 during heating and during cooling. The humidity control signal corresponding to the deviation between the humidity set in the humidity controller 30 and the actually measured humidity value of the hygrometer 28, the temperature set in the indoor temperature controller 29, and the actually measured temperature value of the indoor thermometer 27 The selector 31 compares the temperature control signal corresponding to the deviation and a large signal is selected, and the heat medium flow rates of the downstream three-way valve 21 and the inverter-equipped dispersion pump 22 are controlled. Details of the control are as detailed in the above paragraphs 0027-0030.
The switching control / proportional control of the three-way valve 21 and the rotational speed control of the dispersion pump 22 with the inverter are performed by a zone load control signal based on the indoor thermometer 27 and the hygrometer 28 in the air conditioning zone 26. ing.

Next, the effect | action of the air-conditioning piping system 1 which concerns on this embodiment is demonstrated.
First, at the time of start-up, a heat medium having a constant temperature generated by driving the heat source device 11 is sent through the forward header 13 and the heat medium forward main pipe 16 by each dispersion pump 22 with an inverter as shown in FIG. Then, it is supplied to each temperature control piping system 20 by suction.
In each temperature control piping system 20, the three-way valve 21 is fully opened with the valve 21 a fully closed and 21 c is fully closed and supplied to the temperature control piping system main pipe 20 a to start operation when the air conditioning is started. In order to supply at a flow rate corresponding to the heat load of 26, the opening speed of the three-way valve 21 is adjusted so that the pump rotational speed of the dispersion pump 22 with the inverter of FIG. Done.

The heat medium discharged from each temperature control piping system 20 is returned to the heat source unit 11 through the heat medium return main pipe line 17 and the return header 14 by using the discharge pressure of the dispersion pump 22 with an inverter as a conveying force. In other words, the inverter-equipped dispersion pump 22 takes charge of the entire head of the heat medium, that is, the conveyance power of the heat medium, including the pressure loss of each temperature control piping system 20.
Next, the amount of the heat medium supplied to the air conditioner 24 according to the zone load of the air conditioning zone 26 is rated according to the zone load on the air conditioner 24 side in the heat medium inflow pattern shown in FIG. With the rated operation of rotating the inverter-equipped dispersion pump 22 at a rotation speed of 100% and the reduction of the zone load on the air conditioner 24 side, the frequency of the commercial power supplied to the inverter-equipped dispersion pump 22 is, for example, The partial load operation corresponding to the load that lowers the rotation speed of the dispersion pump 22 with the inverter from 50 Hz to about 15 Hz, and further the reduction of the zone load proceeds, and the power supply frequency is lowered to the lower limit, for example, about 15 Hz. Motor burnout prevention that reduces to the minimum rotation speed just before the rotational torque of the distributed pump 22 motor with inverter becomes small and the rotation of the pump becomes difficult And the minimum rotational operation, is controlled by adjusting the rotational speed of the inverter with the dispersion pump 22 remained.

  Further, the amount of the heat medium supplied to the air conditioner 24 according to the zone load of the air conditioning zone 26 is increased according to the reduction of the zone load on the air conditioner 24 side in the heat medium mixing pattern shown in FIG. While performing the minimum rotational operation for preventing motor burnout, the rotational speed of the distributed pump 22 with the motor is decreased, and the rotational torque of the motor of the distributed pump 22 with the inverter is decreased to the minimum rotational speed just before the rotation of the pump becomes difficult. The heated or cooled heat medium passing through the air conditioner 24 from the bypass pipe 25 is introduced from the valve 21c of the three-way valve 21 and mixed with the heat medium supplied from the temperature control piping main pipe 20a. 21 b is mixed with the heat medium before passing through the air conditioner 24 and is taken into the air conditioner 24 again.

Due to the minimum rotation operation for preventing the burnout of the inverter-equipped dispersion pump 22 and the operation of the heat medium mixing pattern by the three-way valve 21, the flow of the heat medium flowing down the temperature control piping system main pipe 20a of the temperature control piping system 20 during cooling. The temperature can be raised, and the temperature of the heating medium flowing down through each temperature control piping main pipe 20a of each temperature control piping system 20 can be lowered during heating.
For example, at the time of cooling, as shown in FIG. 3A, when the rotation speed of the inverter-equipped dispersion pump 22 becomes the minimum rotation speed for preventing burnout and the control output is further reduced, the process proceeds to the air conditioner inlet temperature control. As a result, the inlet temperature of the air conditioner 24 increases. That is, the temperature of the heat medium flowing through the heat medium going main pipe 16 is constant, but the amount flowing through the temperature control piping main pipe 20a is reduced to the minimum rotation operation for preventing motor burnout of the dispersion pump 22 with the inverter. In the operation of the heat medium mixing pattern, the heat medium whose temperature has been increased by heat exchange in the air conditioner 24 flows from the valve 21c of the three-way valve 21 and mixes and is introduced into the inlet of the air conditioner 24. 24 inlet heat medium temperature becomes high. Accordingly, it is possible to supply the heat medium that can appropriately cope with the zone load while preventing the motor of the inverter distributed pump 22 from being burned out.

Conversely, for example, during heating, as shown in FIG. 3B, when the rotational speed of the inverter-equipped dispersion pump 22 becomes the minimum rotational speed for preventing burnout and the control output is further reduced, the air conditioner inlet temperature control is performed. The inlet temperature of the air conditioner 24 is lowered. That is, the temperature of the heat medium flowing through the heat medium going main pipe 16 is constant, but the amount flowing through the temperature control piping main pipe 20a is reduced to the minimum rotation operation for preventing motor burnout of the dispersion pump 22 with the inverter. In the operation of the heat medium mixing pattern, the heat medium whose temperature has been lowered by heat exchange in the air conditioner 24 flows from the valve 21c of the three-way valve 21 and mixes and is introduced into the inlet of the air conditioner 24. 24 inlet heat medium temperature falls. Accordingly, it is possible to supply the heat medium that can appropriately cope with the zone load while preventing the motor of the inverter distributed pump 22 from being burned out.
By the way, when the heat source device is a compression type refrigerator, if the outlet temperature setting of the cold water refrigerated by the evaporator is increased, the evaporation temperature is increased, that is, the refrigerant pressure of the evaporator is increased, and the compression work of the compressor is reduced. And less compressor operating energy to produce the same cooling capacity. That is, the coefficient of performance COP is improved. In the absorption refrigerator as well, the coefficient of performance COP is improved in the same manner because the driving energy for heat exchange in the regenerator decreases as the cold water outlet temperature is raised.

  In the above description, the control output shown in FIG. 3, that is, the zone load is reduced, the operation is shifted to the air conditioner inlet temperature control, and the operation of bypassing and increasing the inlet temperature of the air conditioner 24 during cooling is described. Similarly, if almost all of the temperature control piping system 20 shifts to an operation for increasing the inlet temperature of the air conditioner 24, the temperature of the heat medium flowing through the heat medium forward main pipe 16 can be increased. That is, the cold water outlet temperature setting from the refrigerator can be increased. As a result, the operating energy of the refrigerator that consumes very much energy can be reduced.

And if the temperature control piping system 20 which carries out the minimum rotation driving | running | working of the dispersion pump 22 with an inverter at the minimum rotation prevention of a motor burning increases, the heat carrier conveyance flow rate of the dispersion pump 22 with an inverter will decrease, and if a zone load becomes small, an air conditioner Shifting to the inlet temperature control, the heat medium flowing through the valve 21a of the three-way valve 21 is throttled and the amount of the heat medium flowing through the heat medium forward main pipe 16 is reduced, so that it is difficult to ensure the minimum flow rate of the heat source unit 11. . In order to secure the minimum flow rate of the heat source unit 11, as shown in FIGS. 1 and 7, the inverter-equipped flow compensation pump 15 is started and the flow rate is controlled based on a command from the flow rate regulator 35.
The control of the flow compensation pump 15 with inverter is controlled by putting the inverter frequency output signals of the plurality of dispersion pumps 22 with inverters into a computing unit (not shown) to assume the flow rate of the main flow path 16 going back to the heat medium or returning the heat medium. A signal obtained by measuring the flow rate of the heat medium with a flow meter 37 installed in the main pipe line 17 is input to the flow rate regulator 35. Further, when there are a plurality of heat source units 11, the operation signal is sent to the heat source unit. The number of operating units obtained from the 11 machine side panel is calculated by a calculator (not shown), and the signal is also input as a condition signal for the flow rate regulator 35 to start and control the flow rate.

Next, all of the plurality of temperature control piping systems 20 have a reduced zone load, the control is shifted to the air conditioner inlet temperature control, and the heat medium flowing through the valve 21a of the three-way valve 21 is throttled and mixed with the return heat medium from the bypass pipe 25. Thus, for example, during cooling, the temperature of the heat medium increases and the inlet temperature of the air conditioner 24 increases. That is, if almost all of the temperature control piping systems 20 shift to the operation of increasing the inlet temperature of the air conditioner 24 as described above, the temperature of the heat medium flowing through the heat medium forward main pipe 16 can be increased, that is, The cold water outlet temperature setting from the refrigerator can be increased.
Increase the chilled water outlet temperature setting (for example, load reset control of air supply temperature control in the single air duct system on the secondary side of the air conditioner: the load decreases to secure the air supply required for ventilation However, it is necessary to judge and control whether or not the chilled water outlet temperature setting can be raised, and control the raising of the supply air temperature without reducing the air flow. As a measurement signal to be used, a temperature measurement value of a thermometer 23 that measures an air conditioner inlet temperature of each temperature control piping system 20 is used.

When each zone load becomes small and the temperature control piping system 20 shifts to the air conditioner inlet temperature control, control is performed as shown in FIG. 3 so that the zone load can be processed by the supply air from the air conditioner 24. The air conditioner 24 is automatically mixed with the return heat medium from the bypass pipe 25 by the three-way valve 21 without grasping the heat medium temperature required for the heat exchange performance of the cold water coil or the hot water coil incorporated in the heat pump 24. The heating medium is adjusted to the inlet temperature. That is, if the inlet heat medium temperature of the air conditioner 24 is measured, the heat medium temperature required by the cold water coil or the hot water coil built in the air conditioner 24 can be determined.
Conversely, once the temperature of the heat medium going main pipeline 16 is changed and increased during cooling to continue operation, and each zone load increases, the pump speed shown in FIG. 3 becomes 100%. If there is only one temperature control piping system 20, the cold water outlet temperature setting may be returned to the original setting.

It is desirable that the cold water outlet temperature setting change control is specifically performed in steps shown in FIG. As shown in FIG. 5, the inlet temperatures t <b> 1 to tn of the air conditioner 24 of the heat medium of each temperature control piping system main pipe 20 a are measured by each thermometer 23.
At the time of cooling, as shown in FIG. 6, in the temperature controller 34 via the forward temperature variable control circuit 32, in step S1, from among the inlet temperatures t1 to tn of the air conditioners 24 sent from each thermometer 23. Find the minimum temperature.
Next, in step S2, a value obtained by subtracting, for example, 0.5 ° C. from the determined minimum value tmin is set as the outlet temperature of the heat source unit with refrigerator (refrigerator) 11.

Next, in step S3, the obtained outlet temperature of the heat source unit 11 = tmin−0.5 ° C. is held for 30 minutes.
The flow for changing the outlet temperature of the heat source unit 11 is obtained once every hour by obtaining the above minimum value setting.
During heating, the minimum value tmin in FIG. 6 is replaced with the maximum value tmax, and the outlet temperature of the heat source unit 11 is set to tmax + 0.5 ° C.
That is, in the temperature controller 34 connected to each thermometer 23 via the temperature transmission instrumentation line 32 and the selector 33, the maximum temperature tmax is set once every 30 minutes, for example. Then, the outlet temperature of the heat source unit 11 is set to a value obtained by adding 0.5 ° C. to the selected maximum temperature.
Conversely, once the temperature of the outlet of the heat source unit 11 is changed and increased during cooling to continue operation, and each zone load increases, the temperature at which the pump rotation speed shown in FIG. If there is only one control piping system 20, the control for returning the cold water outlet temperature setting to the original state may be performed in the same manner.

As described above, according to the present embodiment, the total head-holding system using the dispersion pump 22 with the inverter is configured, and the flow compensation pump 15 with the inverter is the primary side between the forward header 13 and the return header 14 and the heat source unit 11. Since the minimum flow rate can be ensured with only the head, the heat medium of the required flow rate can be supplied by the dispersion pump 22 with the inverter according to the zone load on the air conditioner 24 side, so that the energy of the power of the dispersion pump 22 with the inverter can be saved. .
In addition, since each dispersion pump system is provided with a bypass constituted by the three-way valve 21 and the bypass pipe 25, the heat medium flow rate calculated from the zone load is defined from the minimum frequency of the inverter of the dispersion pump 22 with the inverter. If the flow rate is less than the minimum burnout prevention flow rate, the flow rate of the dispersion pump 22 with the inverter is kept constant at the minimum burnout prevention flow rate, and the excess flow rate is returned by bypass circulation to reduce the amount of heat, and only the necessary heat amount of the heat medium A bleed-in type load can be accommodated by a three-way valve.

  Further, the temperature of the heat medium is measured by the thermometer 23 in each temperature control piping system 20 that is each dispersion pump system, and the heat medium mixing between the bypass constituted by the three-way valve 21 and the bypass pipe 25 and the heat medium forward main pipe is performed. When the temperature going to the load exceeds the minimum value during cooling or below the maximum value during heating, control is performed to change the heat medium temperature setting value at the outlet of the heat source device such as a central refrigerator. Therefore, COP improvement of the refrigerator which is the heat source device 11 can be expected. For example, the temperature of the cold water outlet when heat is exchanged with the heat medium in the evaporator in the heat source unit 11 can be increased to 8 ° C. or 9 ° C. in the fall and winter, while the temperature set at 7 ° C. in the summer It becomes.

(Second embodiment)
FIG. 9 shows an air conditioning piping system 2 according to the second embodiment of the present invention.
The air conditioning piping system 2 according to the second embodiment shows an example in which a distributed pump system is applied to the primary pump system.
The air-conditioning piping system 2 according to the second embodiment is a bypass pipe 42 between headers that connects the heat source device 11, the forward header 13 and the return header 14, and the forward header 13 and the return header 14 via the inter-header flow rate adjustment valve 43. A primary pump 41 with an inverter is provided on the constructed primary side, and the dispersion pump 22 with an inverter has a lifting head with a heat medium return main pipe 16 downstream of the forward header 13 and a heat medium return main pipe upstream of the return header 14. 17 and the temperature control piping system 20, the primary pump 41 with an inverter includes a heat medium forward main line from the heat source unit 11 to the forward header 13, a heat medium return main line to the return header 14, and a heat source. It has a head for the heat medium conveyance pressure loss of the machine 11 and conveys the heat medium. In that we have the function to ensure the minimum flow rate, the air-conditioning piping system 1 according to the first embodiment differs.

In this embodiment, when the zone load becomes small and the rotation speed of each inverter-equipped dispersion pump 22 in the temperature control piping system 20 of a certain number or more becomes the minimum rotation speed to prevent burning, the minimum flow rate of the heat source unit 11 is secured. Therefore, the flow rate of the primary pump 41 with an inverter and the opening degree of the inter-header flow rate adjustment valve 43 are controlled via the primary pump control circuit 36a with an inverter based on a command from the flow rate regulator 35.
When each zone load becomes small and the temperature control piping system 20 shifts to the air conditioner inlet temperature control, control is performed as shown in FIG. 3 so that the zone load can be processed by the air supply from the air conditioner 24. The air conditioner automatically mixes with the return heat medium from the bypass pipe 25 by the three-way valve 21 without grasping the heat medium temperature required for the heat exchange performance of the cold water coil or the hot water coil incorporated in the machine 24. It is adjusted to a heat medium with a 24 inlet temperature. That is, if the inlet heat medium temperature of the air conditioner 24 is measured, the heat medium temperature required by the cold water coil or the hot water coil built in the air conditioner 24 can be determined.

All of the plurality of temperature control piping systems 20 have a reduced zone load, shift to air conditioner inlet temperature control, and the heat medium flowing through the valve 21a of the three-way valve 21 is throttled and mixed with the return heat medium from the bypass pipe 25. For example, during cooling, the temperature of the heat medium rises and the inlet temperature of the air conditioner 24 increases. That is, if almost all of the temperature control piping systems 20 shift to the operation of increasing the inlet temperature of the air conditioner 24 as described above, the temperature of the heat medium flowing through the heat medium forward main pipeline 16 can be increased. That is, the cold water outlet temperature setting from the refrigerator can be increased.
Conversely, once the temperature of the heat medium going main pipeline 16 is changed and increased during cooling to continue operation, and each zone load increases, the pump speed shown in FIG. 3 becomes 100%. If there is only one temperature control piping system 20, the cold water outlet temperature setting may be returned to the original setting.

According to the present embodiment, the primary pump system with the secondary head lift by the dispersion pump 22 with the inverter is configured, and the primary pump 41 with the inverter is only on the primary side between the forward header 13 and the return header 14 and the heat source unit 11. Since the minimum flow rate of the heat source unit can be secured by the head of the air flow, only the necessary amount of heat medium can be supplied to the air conditioner 24 by the dispersion pump 22 with inverter according to the zone load on the air conditioner 24 side. Energy saving.
In addition, since each temperature control piping system 20 that is a dispersion pump system is provided with a bypass constituted by a three-way valve 21 and a bypass pipe 25, the heat medium flow rate calculated from the zone load is such that the dispersion pump 22 with an inverter If the flow rate is less than the minimum flow rate to prevent burnout specified by the minimum frequency of the inverter, the flow rate of the dispersion pump 22 with the inverter is kept constant at the minimum flow rate to prevent burnout, and the excess flow rate is returned by bypass circulation to reduce the amount of heat. A bleed-in type load can be accommodated by a three-way valve that ensures only the necessary heat quantity of the heat medium.

  Further, the temperature of the heat medium is measured by the thermometer 23 in each temperature control piping system 20 that is each dispersion pump system, and the heat medium mixing between the bypass constituted by the three-way valve 21 and the bypass pipe 25 and the heat medium forward main pipe is performed. When the temperature going to the load exceeds the minimum value during cooling or below the maximum value during heating, control is performed to change the heat medium temperature setting value at the outlet of the heat source device such as a central refrigerator. Therefore, COP improvement of the refrigerator which is the heat source device 11 can be expected. For example, the temperature of the cold water outlet when heat is exchanged with the heat medium in the evaporator in the heat source unit 11 can be increased to 8 ° C. or 9 ° C. in the fall and winter, while the temperature set at 7 ° C. in the summer It becomes.

(Third embodiment)
FIG. 10 shows an air conditioning piping system 3 according to the third embodiment of the present invention.
The air conditioning piping system 3 according to the third embodiment shows an example in which a distributed pump system is applied to a primary pump secondary pump system.
The air conditioning piping system 3 according to the third embodiment is a bypass pipe 42 between headers that connects the heat source device 11, the forward header 13 and the return header 14, and the forward header 13 and the return header 14 via the inter-header flow rate adjustment valve 43. A primary pump with an inverter is provided on the constructed primary side, and the dispersion pump 22 with an inverter has a lifting head as a pressure loss of the temperature control piping system 20, and the forward header 13 is made into two forward headers 13 a and 13 b. Two secondary pumps 44 with an inverter and a pressure regulating valve 45 are arranged between the outgoing headers 13a and 13b, and a pressure gauge 46 and a pressure regulator 47 for measuring a pressure difference between the outgoing headers 13a and 13b are provided. A primary pump discharge pressure control circuit 48 is provided, and the primary pump 41 with an inverter is a heat medium going from the heat source unit 11 to the going header 13. It has a head for the heat medium return main line up to the pipe line, the return header 14, and the heat medium transport pressure loss of the heat source unit 11, and transports the heat medium, and instead of the flow rate compensation pump with the inverter, the heat source unit 11 It differs from the air-conditioning piping system 1 which concerns on 1st embodiment by the point which has the function which ensures the minimum flow volume.

In the variable flow rate control method of the discharge pressure control having a secondary pump, the conventional method is equipped with an air conditioner and a two-way valve in the portion corresponding to the temperature control piping system, and the two-way valve opens and closes due to fluctuations in zone load. In other words, the pressure of the pressure adjusting valve 45 installed as a bypass valve between the two forward headers at each of the secondary pump inlet / outlet is largely changed where the pressure in the heat medium forward main pipe 16 greatly changes due to the influence of the flow rate variation of the heat medium. By opening and closing, control is performed to keep the heat medium pressure in the heat medium forward main line 16 constant with good response. In particular, when a plurality of secondary pumps are provided, the water supply pressure is kept constant to improve the controllability of the temperature control piping system.
Also in this example, the heat medium travels due to the push transport of the secondary pump 44 with the inverter to the heat medium transport main pipe 16 and the head mismatch of the dispersion pump 22 with the inverter that controls the flow rate and transport in each temperature control piping system 20. Where the pressure fluctuation in the main pipe line 16 is likely to occur, the open / close control of the pressure regulating valve 45 installed as a bypass valve between the two forward headers 13a, 13b is a differential pressure gauge 46 for measuring the pressure difference between the forward headers 13a, 13b. This is performed by a pressure regulator 47 that controls the pressure regulating valve 45 based on the signal from. As a result, the water supply pressure of the heat medium forward main pipe 16 is controlled to be stable.

  According to this embodiment, the bypass pipe 25 is connected to the valve 21c of the three-way valve 21 to each temperature control piping system 20 which is a dispersion pump system, and a part of the outlet heat medium of the air conditioner 24 is returned and mixed. Thus, while maintaining the minimum rotational operation of the inverter-equipped dispersion pump 22 to prevent motor burnout by this bypass circulation, it depends on the characteristic of the mechanism of the three-way valve (the characteristic that the one side becomes tighter if the flow path opens on one side) Utilizing the fact that the bypass circulation fluctuation due to the heat medium pressure fluctuation from the outside is small, it is responsible for the pressure loss of the long extension heat medium forward main line 16 and the heat medium return main line 17 of the secondary pump 44 with the mainstream inverter. The secondary pump 4 with an inverter is eliminated by eliminating the through of the heat medium from the pushing pressure to the temperature control piping system 20 close to the forward headers 13a and 13b and the return header 14 due to the large head. It is possible to eliminate the waste of power.

Further, when the three-way valve 21 and the bypass pipe 25 circulate only by bypass, that is, as shown in FIG. 2 (c), when the inverter-equipped dispersion pump 22 stops, the valve 21a is closed and the valve 21b, When there is a temperature control piping system 20 that is operated in a heat medium stop pattern that opens the 21c, the valve 21a of the three-way valve 21 is fully closed, so that the pushing pressure of the secondary pump 44 with an inverter is applied. However, even if the back pressure of the primary pump 41 with the inverter is indirectly applied, even if the discharge pressure of the dispersion pump 22 with the inverter included in the other temperature control piping system 20 is applied to the outlet side of the air conditioner, Does not pass through the valve 21a and flow from the heat medium return main pipe line 16 to the heat medium return main pipe line 17. Therefore, special equipment for preventing backflow is not required.
And by providing the dispersion pump 22 with an inverter, the three-way valve 21 and the bypass pipe 25 for each of the plurality of temperature control piping systems 20, the zone load increases after a certain temperature control piping system 20 stops, and the air conditioner Even when the operation of the valve 24 is resumed, the heat medium forward main line 16 is closed by closing the valve 21a of the three-way valve 21 and circulating the bypass pipe 25 in advance, then gradually opening the valve 21a and closing the valve 21c. It is also possible to moderate the flow rate fluctuations of the above and prevent the flow rate fluctuations with overshoots of the primary pump 41 with the inverter and the secondary pump 44 with the inverter.

Further, the heat medium temperature is measured by the thermometer 23 in each temperature control piping system 20 which is each dispersion pump system, and the heat medium mixing between the bypass constituted by the three-way valve 21 and the bypass pipe 25 and the heat medium forward main pipeline 16 is performed. When the temperature going to the load due to the air temperature exceeds the minimum value during cooling or below the maximum value during heating, control is performed to change the heat source device outlet heat medium temperature setting value such as the central refrigerator. Therefore, the COP improvement of the refrigerator that is the heat source unit 11 can be expected. For example, the temperature of the cold water outlet when heat is exchanged with the heat medium in the evaporator in the heat source unit 11 can be increased to 8 ° C. or 9 ° C. in the fall and winter, while the temperature set at 7 ° C. in the summer It becomes.
Also in the present embodiment, when the zone load is reduced and the rotation speed of each inverter-equipped dispersion pump 22 of the temperature control piping system 20 of a certain number or more becomes the minimum rotation speed to prevent burning, the minimum of the heat source unit 11 is used. In order to ensure the flow rate, the flow rate of the primary pump 41 with the inverter and the opening degree of the inter-header flow rate adjustment valve 43 are controlled via the primary pump control circuit 36a with the inverter based on a command from the flow rate regulator 35.

In each of the above-described embodiments, the compression type refrigerator is described as an example of the heat source device (heat source unit 11). However, the heat medium is water regardless of whether it is an absorption type refrigerator, a cold / hot water generator, or a hot water boiler. Various heat source machines 11 may be used.
Moreover, although the air-conditioning piping system which concerns on this invention was demonstrated based on 1st embodiment, 2nd embodiment, 3rd embodiment, this invention is not limited to this, For example, the conventional primary pump system shown in FIG. And the temperature control piping system in the conventional primary pump secondary pump system shown in FIG. 12 is the temperature control piping system 20 described in each of the above embodiments, so that the same operational effects as those of the above embodiments can be obtained. It becomes possible.

1, 2, 3 Air-conditioning piping system 11 Heat source machine 12 Flow rate adjusting valve 13 Outgoing header 14 Return header 15 Flow compensation pump 15a with inverter Primary bypass pipe 16 Heat medium return main line 17 Heat medium return main line 18 Heat medium return line 18 19 Heat medium return pipe 20 Temperature control piping system 20a Temperature control piping system main pipe 21 Three-way valve 22 Dispersion pump 23 with inverter 23 Thermometer 24 Air conditioner 25 Bypass pipe 26 Air conditioning zone 32 Outward temperature transmission instrumentation line 33 Selector 34 Temperature controller 35 Flow controller 36 Flow compensation pump control circuit with inverter 36a Primary pump control circuit with inverter 37 Flow meter 40 Calorimeter 41 Primary pump with inverter 44 Secondary pump with inverter 47 Pressure controller

Claims (4)

From the inlet side to the outlet side, the heat medium outlet line is provided with a three-way valve, a dispersion pump with an inverter, a thermometer and an air conditioner, and the heat medium return line is provided on the outlet side of the air conditioner, and the three-way valve And a plurality of temperature control piping systems for air-conditioning the plurality of zones independently by heat exchange between the heat medium and air by the air conditioner, respectively, and a bypass pipe connecting the heat medium return pipe line,
A heat source device for supplying a heat medium adjusted in temperature to the plurality of temperature control piping systems by a conveying force of a dispersion pump with an inverter;
A heat medium forward main line connected to an outlet side of the heat source device and connected to an inlet side of the plurality of temperature control piping systems;
A heat medium return main conduit connected to the inlet side of the heat source device and connected to the outlet side of the plurality of temperature control piping systems;
A forward header connected to the forward side of the plurality of temperature control piping systems on the way through the heat medium forward main line;
A return header connected to the return side of the plurality of temperature control piping systems through the heat medium return main pipeline,
A primary bypass pipe having a flow rate compensation pump with an inverter for securing a minimum flow rate of the heat source device, connecting the forward header and the return header;
Temperature indication adjustment for inputting a temperature of the heat medium from each thermometer, calculating a minimum temperature or a maximum temperature, and calculating a heat medium set temperature of the heat source device by calculating based on a selector and a selector output signal A primary-side control device that has a meter and performs rotation control of the inverter-compensated flow compensation pump;
A secondary side control device that performs rotation control of the dispersion pump with the inverter according to the load of the zone, and switching control of the three-way valve ,
The secondary-side control device controls the three-way valve so that the bypass pipe is closed during the rated operation of the air conditioner, operates the distributed pump with the inverter, and performs partial load operation of the air conditioner. Sometimes, the flow rate of the inverter-equipped dispersion pump is controlled according to the load of the zone, and when the air conditioner is stopped, the inverter-equipped dispersion pump is stopped, and the heat medium going main line side of the three-way valve is closed. The three-way valve is controlled to stop the inflow of the heat medium from the heat medium outgoing main pipe line and to open the bypass pipe, and the primary side control device is configured to control the plurality of temperature control pipes. in a state in which a certain number stops the inverter with the dispersion pump systems to ensure minimum flow rate of the heat source device by driving the inverter with flow compensation pump, before In a state where all of the plurality of temperature control piping systems have throttled the valve body connected to the upstream side of the three-way valve, the plurality of temperature controls are set to the outlet heat medium set temperature of the heat source device. An air conditioning piping system that performs variable control based on the minimum temperature or the maximum temperature selected by a selector from the thermometer measurement values of the piping system. In the air-conditioning piping system according to claim 1,
The primary side control device determines a state in which a constant number of the plurality of temperature control piping systems has stopped the dispersion pump with the inverter based on a measurement value of a flow meter provided in the heat medium return main pipeline, An air conditioning piping system characterized by controlling the drive and rotation speed of a flow compensation pump with an inverter . From the inlet side to the outlet side, the heat medium outlet line is provided with a three-way valve, a dispersion pump with an inverter, a thermometer and an air conditioner, and the heat medium return line is provided on the outlet side of the air conditioner, and the three-way valve And a plurality of temperature control piping systems for air-conditioning the plurality of zones independently by heat exchange between the heat medium and air by the air conditioner, respectively, and a bypass pipe connecting the heat medium return pipe line,
A heat source device for adjusting the temperature of the heat medium supplied to the plurality of temperature control piping systems;
A heat medium forward main line connected to an outlet side of the heat source device and connected to an inlet side of the plurality of temperature control piping systems;
A heat medium return main conduit connected to the inlet side of the heat source device and connected to the outlet side of the plurality of temperature control piping systems;
A forward header connected to the forward side of the plurality of temperature control piping systems on the way through the heat medium forward main line;
A return header connected to the return side of the plurality of temperature control piping systems through the heat medium return main pipeline,
An inter-header bypass pipe connecting the forward header and the return header via an inter-header flow control valve;
Heat medium return main pipeline located near the heat source device in the heat medium return main pipeline, the heat medium return main pipeline from the heat source device to the forward header, the heat medium return main pipeline to the return header, and the heat medium conveyance of the heat source device A primary pump with an inverter for conveying the heat medium having a head for a pressure loss and ensuring a minimum flow rate of the heat source device;
Temperature indication adjustment for inputting a temperature of the heat medium from each thermometer, calculating a minimum temperature or a maximum temperature, and calculating a heat medium set temperature of the heat source device by calculating based on a selector and a selector output signal A primary-side control device that has a meter and performs rotation control of the primary pump with the inverter;
A secondary-side control device that performs rotation control of the inverter-equipped distributed pump and switching control of the three-way valve according to the load of the zone;
With
The secondary-side control device controls the three-way valve so that the bypass pipe is closed during the rated operation of the air conditioner, operates the distributed pump with the inverter, and performs partial load operation of the air conditioner. Sometimes, the flow rate of the inverter-equipped dispersion pump is controlled according to the load of the zone, and when the air conditioner is stopped, the inverter-equipped dispersion pump is stopped, and the heat medium going main line side of the three-way valve is closed. The three-way valve is controlled to stop the inflow of the heat medium from the heat medium outgoing main pipe line and to open the bypass pipe, and the primary side control device is configured to control the plurality of temperature control pipes. In a state where a certain number of system stops the dispersion pump with inverter, the opening degree of the flow adjustment valve between headers is controlled while adjusting the flow rate of the primary pump with inverter. In the state where the minimum flow rate of the heat source device is ensured and the valve body connected to the upstream side of the heat medium outlet pipe of the three-way valve is throttled, all of the plurality of temperature control piping systems An air conditioning piping system that performs variable control on the outlet heat medium set temperature based on the lowest temperature or the highest temperature selected by a selector from the thermometer measurement values of the plurality of temperature control piping systems. From the inlet side to the outlet side, the heat medium outlet line is provided with a three-way valve, a dispersion pump with an inverter, a thermometer and an air conditioner, and the heat medium return line is provided on the outlet side of the air conditioner, and the three-way valve And a plurality of temperature control piping systems for air-conditioning the plurality of zones independently by heat exchange between the heat medium and air by the air conditioner, respectively, and a bypass pipe connecting the heat medium return pipe line,
A heat source device for adjusting the temperature of the heat medium supplied to the plurality of temperature control piping systems;
A heat medium forward main line connected to an outlet side of the heat source device and connected to an inlet side of the plurality of temperature control piping systems;
A heat medium return main conduit connected to the inlet side of the heat source device and connected to the outlet side of the plurality of temperature control piping systems;
A forward header connected to the forward side of the plurality of temperature control piping systems on the way through the heat medium forward main line;
A return header connected to the return side of the plurality of temperature control piping systems through the heat medium return main pipeline,
The heating medium forward main pipe after the forward header and the lift for the heat medium transport pressure loss of the heat medium return main pipe to the return header for transporting the heat medium to the plurality of temperature control piping systems A secondary pump with an inverter located in the downstream of the forward header of the heat medium forward main pipe,
An inter-header bypass pipe connecting the forward header and the return header via an inter-header flow control valve;
Heat medium return main pipeline located near the heat source device in the heat medium return main pipeline, the heat medium return main pipeline from the heat source device to the forward header, the heat medium return main pipeline to the return header, and the heat medium conveyance of the heat source device A primary pump with an inverter for conveying the heat medium having a head for a pressure loss and ensuring a minimum flow rate of the heat source device;
Temperature indication adjustment for inputting a temperature of the heat medium from each thermometer, calculating a minimum temperature or a maximum temperature, and calculating a heat medium set temperature of the heat source device by calculating based on a selector and a selector output signal A primary-side control device that has a meter and performs rotation control of the primary pump with the inverter;
A secondary side control device that performs rotation control of the dispersion pump with the inverter according to the load of the zone, and switching control of the three-way valve ,
The secondary-side control device controls the three-way valve so that the bypass pipe is closed during the rated operation of the air conditioner, operates the distributed pump with the inverter, and performs partial load operation of the air conditioner. Sometimes, the flow rate of the inverter-equipped dispersion pump is controlled according to the load of the zone, and when the air conditioner is stopped, the inverter-equipped dispersion pump is stopped, and the heat medium going main line side of the three-way valve is closed. The three-way valve is controlled to stop the inflow of the heat medium from the heat medium outgoing main pipe line and to open the bypass pipe, and the primary side control device is configured to control the plurality of temperature control pipes. In a state where a certain number of system stops the dispersion pump with inverter, the opening degree of the flow adjustment valve between headers is controlled while adjusting the flow rate of the primary pump with inverter. Ensuring the minimum flow rate of the heat source apparatus Te, in the state in which all of the plurality of temperature control piping system is turned down the valve element which is connected to the heat medium forward pipe path downstream of said three-way valve, the heat source device An air conditioning piping system that performs variable control on the outlet heat medium set temperature based on the lowest temperature or the highest temperature selected by a selector from the thermometer measurement values of the plurality of temperature control piping systems.

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