JP2020070950A - Building cooling and heating system - Google Patents

Abstract

To enable a water-cooled multiple packaged air conditioner to be installed in a building in a certain area subject to area-wide air conditioning.SOLUTION: A building 10 into which a building cooling and heating system is introduced has: a water-cooled multiple packaged air conditioner 11; a heat exchanger 12a which performs heat exchange between cold water (circulated water) for DHC sent from another building located in a certain area subject to area-wide air conditioning and heat source water of the water-cooled multiple packaged air conditioner 11; a heat exchanger 12b which performs heat exchange between hot water (circulated water) for DHC sent from another building and the heat source water of the water-cooled multiple packaged air conditioner 11; and a controller 18 which closes a hot water valve 13b and controls an opening of a cold water valve 13a, when a cooling load is larger than a heating load in the building 10, so that a temperature of the heat source water supplied to a heat source unit 111 becomes not less than 10 degrees and closes the cold water valve 13a and controls the opening of the hot water valve 13b, when the heating load is larger than the cooling load, so that the temperature of the heat source water supplied to the heat source unit 111 becomes not more than 45 degrees.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a building heating / cooling system, and more particularly to a cooling / heating system suitable for a building within a certain area of district cooling / heating.

  2. Description of the Related Art Conventionally, building multi-air conditioners have been popular for medium and large-scale buildings. Unlike central air conditioning, which is suitable for large-scale buildings, where one heat source unit is used to air-condition the entire building, multi-air conditioners for buildings connect multiple indoor units to heat source units (outdoor units) installed on each floor, for example. However, the temperature can be adjusted for each indoor unit (room), and the cooling and heating can be set freely, which improves comfort.

  By the way, in recent years, district heating and cooling have become widespread. District heating and cooling is a system that supplies heat media such as cold water, hot water, and steam from a heat supply facility (regional heating and cooling plant) to a large number of buildings in a certain area through regional piping to perform cooling, heating, and hot water supply. .. In other words, in district heating and cooling, central air conditioning is adopted in each building in order to collectively manufacture and supply heat sources for the entire region by the district heating and cooling plant.

JP, 2012-42162, A JP, 2006-266520, A JP 2005-140367 A

  Since central air conditioning is adopted in district heating and cooling, it is not possible to switch between cooling mode and heating mode for each room in a building where district cooling and heating is introduced. Of course, it may be possible to install a building multi-air conditioner independently without introducing district heating and cooling.

  However, when it comes to introducing an air-cooled multi air conditioner for buildings, the number of outdoor units will exceed 1,000, which is especially noticeable in ultra-large-scale buildings, especially in skyscrapers with a total floor area exceeding 100,000 square meters. , In some cases, the outdoor unit cannot be installed on the roof. Even if it can be physically installed, it cannot be actually installed due to the specifications of the multi-air conditioner if there is a difference in height between the outdoor unit and the indoor unit.

  Further, when an outdoor unit is installed on a balcony or the like on each floor, the outdoor unit on the upper floor may be affected by the exhaust heat of the outdoor unit on the lower floor and may not be able to operate efficiently.

  On the other hand, when trying to introduce a water-cooled multi air conditioner for buildings, the number of cooling towers and boilers increases, which causes cost problems such as maintenance costs and installation area problems similar to the air-cooled type.

  An object of the present invention is to make it possible to install a water-cooled multi air conditioner for a building even in a building within a certain area for district heating and cooling.

  A building air-conditioning system according to the present invention includes a water-cooled multi-air conditioner for buildings, return water from another building within a certain area of district air-conditioning to a district air-conditioning plant, and heat source water for the water-cooled multi air conditioner for buildings. And a control means for controlling the temperature of the heat source water supplied to the heat source unit of the water-cooled multi-air conditioner for buildings by utilizing the temperature of the return water from the building. Is characterized by.

  Further, the heat exchanger, a cold water heat exchanger for exchanging heat between cold water returned from the other building and heat source water for cold water supplied to the heat source unit; and a heat exchanger for cooling water from the other building. It has a heat exchanger for hot water which exchanges heat between return water of hot water and heat source water for hot water supplied to the heat source unit.

  Further, the control means controls the flow path of the heat source water to be supplied to the heat source unit based on the load information on cooling and heating acquired from the water-cooled multi-air conditioner for buildings.

  Further, when the cooling load is higher than the heating load, the control means controls to supply the heat source water heat-exchanged by the cold water heat exchanger to the heat source unit.

  Further, when the heating load is higher than the cooling load, the control means controls to supply the heat source water that has been heat-exchanged by the hot water heat exchanger to the heat source unit.

  Further, the control means controls the flow rate to the water-cooled building multi-air conditioner based on the temperature of the heat source water supplied to the heat source unit.

  According to the present invention, it is possible to install a water-cooled multi air conditioner for a building even in a building within a certain area of district heating and cooling.

It is a conceptual diagram which shows the connection form of the regional piping of district heating and cooling in this Embodiment. 1 is an overall configuration diagram showing an embodiment of a building cooling / heating system according to the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  "Regional cooling and heating" means, as mentioned above, that a large number of buildings within a certain area are supplied with heat medium such as chilled water, hot water and steam through regional piping from a heat supply facility (community cooling and heating plant) to cool and heat the building. This refers to a system for supplying hot water, but in the present embodiment, a case where it is applied to district heating and cooling that supplies heat source water (cooling water) to each building will be described as an example.

  FIG. 1 is a conceptual diagram showing a connection form of regional pipes for district heating and cooling in the present embodiment. FIG. 1 shows a DHC (Distribution Heating and Cooling) 1 and a plurality of buildings 2. The DHC 1 is a district heating / cooling system, and in the present embodiment, a district heating / cooling plant that supplies cold water and hot water as heat source water particularly for central air conditioning of each building 2 is shown. The building 2 is a building located within a certain area for district heating and cooling, and uses the heat source water supplied from the DHC 1 to perform air conditioning by the central air conditioning system. Between the DHC 1 and each building 2, there are a regional pipe 3 for supplying the cold water produced by the DHC 1 to each building 2, a regional pipe 4 for supplying the hot water produced by the DHC 1 to each building 2, and each building 2. A regional pipe 5 for returning cold water supplied from the DHC1 to the DHC1 after being used for air conditioning, and a regional pipe 6 for returning the hot water supplied from the DHC1 to the DHC1 for use in the air conditioning to the DHC1. It is arranged. The temperature of the cold water supplied to each building 2 by the DHC 1 is generally about 7 degrees and the temperature of the hot water is about 60 degrees, although it depends on the district heating and cooling. Further, from the current situation, it is assumed that the temperature of the cold water returned to each building 2 to the DHC 1 is about 12 degrees, and the temperature of the hot water is about 40 degrees.

  In the following description, the cold water that the DHC 1 supplies to each building 2 through the regional piping 3 is “cold water (outgoing water)”, and the hot water that the DHC 1 supplies to each building 2 through the regional piping 4 is “warm water (outgoing water)”. The cold water that the building 2 returns to the DHC 1 through the regional pipe 5 is referred to as “cold water (return water)”, and the warm water that each building 2 returns to the DHC 1 through the regional pipe 6 is referred to as “warm water (return water)”. When it is not necessary to distinguish cold water (going water) and hot water (going water), they are collectively referred to as “going water”. Similarly, when it is not necessary to distinguish cold water (return water) and hot water (return water), they are collectively referred to as “return water”.

  The building 10 in which the building heating / cooling system according to the present embodiment is installed does not receive the incoming water supply from the DHC 1 as the heat source water and uses the temperature of the heat source water used by the other building 2, that is, the return water temperature. For this purpose, a heat exchanger for cold water and a heat exchanger for hot water are installed at the mounting positions 7a and 7b of the regional pipes 5 and 6 where the other building 2 returns the return water to the DHC 1, respectively. In addition, you may install in the installation position 8a, 8b in order to utilize the temperature of the cold water (return water) and warm water (return water) from the some building 2.

  FIG. 2 is an overall configuration diagram showing an embodiment of a building cooling / heating system according to the present invention. FIG. 2 shows a building 10 to which the building heating / cooling system according to the present embodiment is applied, unlike the building 2 having a central air conditioning system. The building 10 is equipped with a building heating / cooling system that uses a water-cooled multi-air conditioning system (water-cooled building) 11.

  The water-cooled building multi-air conditioner 11 includes a heat source unit (outdoor unit) 111, a diversion controller 112, and an indoor unit (indoor unit) 113. For example, one to a plurality of indoor units 113 are installed in a room and supply cold air or warm air to the room. The indoor unit 113 can individually set the operation mode and the room temperature setting. The heat source unit 111 generates cold air / warm air from the heat source water. The diversion controller 112 supplies the cold air / warm air generated by the heat source unit 111 to each indoor unit 113 according to the setting of the operation mode of each indoor unit 113. The water-cooled building multi-air conditioner 11 may use the existing device including an outdoor unit, a diversion controller, and an indoor unit as it is.

  In this embodiment, the return water from another building 2 is used as a heat source, and a cold water tower and a boiler are not required. That is, the water-cooled multi air conditioner 11 for a building does not include a cold water tower and a boiler. The structure of the water-cooled multi-air conditioner 11 for a building shown in FIG. 2 may be the same for each floor of the building 10, and therefore only one set of structures is shown in FIG.

  In the building 10, a heat exchanger 12 that exchanges heat between the return water from the other building 2 and the heat source water of the water-cooled multi air conditioning system 11 is installed. In the present embodiment, the heat exchangers 12a and 12b are installed for cold water and hot water in consideration of the efficiency of heat exchange, but it is possible to operate with at least one of them. When it is not necessary to distinguish between the two heat exchangers 12a and 12b, they are collectively referred to as the "heat exchanger 12" as described above. The heat exchanger 12a is connected to the mounting position 7a shown in FIG. 1 and exchanges heat between cold water (return water) from another building 2 and heat source water of the water-cooled multi air conditioning system 11 for a building. The heat exchanger 12b is connected to the mounting position 7b shown in FIG. 1 and exchanges heat between hot water (return water) from another building 2 and the heat source water of the water-cooled multi air conditioning system 11 for buildings.

  Between the water-cooled building multi-air conditioner 11 and the heat exchanger 12, a pipe for circulating the heat source water of the water-cooled building multi-air conditioner 11 is installed as shown in FIG. The heat source water output from the heat exchanger 12a can be supplied to the water-cooled building multi-air conditioner 11 through a valve (cold water valve) 13a, a thermometer 14, and a pump 16 whose operation is controlled by an inverter 15. Piping is installed at. On the other hand, piping is installed so that the heat source water output from the heat exchanger 12b can be supplied to the water-cooled multi air conditioning system 11 for the building through the valve (hot water valve) 13b, the thermometer 14 and the pump 16. It The piping is installed so that the heat source water used by the water-cooled multi air conditioner 11 for a building passes through the flow meter 17 and is supplied to the heat exchanger 12. In the present embodiment, the heat source water is returned by switching to the heat exchanger 12a or the heat exchanger 12b, that is, exclusively.

  The controller 18 functions as a control unit that controls the temperature of the heat source water supplied to the heat source unit 111 of the water-cooled multi-air conditioner 11 using the temperature of the return water from the other building 2. When controlling the temperature of the heat source water, the opening / closing control of the valves 13a and 13b and the operation of the inverter 15 are performed based on the measured values of the thermometer 14 and the flow meter 17 and the load information related to cooling and heating acquired from the water-cooled multi-air conditioner 11 for the building. To regulate the flow rate from the pump 16.

  The controller 18 can be realized by a conventional general-purpose hardware configuration. That is, the controller 18 is configured by connecting storage means such as a CPU, a ROM, a RAM and a hard disk drive (HDD) to the internal bus. Moreover, you may provide a communication interface and a user interface as needed. The controller 18, which will be described later, may be realized by hardware or by a cooperative operation of the CPU and a program operating on the CPU. The program may be installed during or after the controller 18 is installed via a network or the like.

  Next, the operation of this embodiment will be described.

  The controller 18 obtains load information related to cooling and heating from the water-cooled building multi-air conditioner 11. The load information includes the number of operating indoor units 113 used in the entire building 10 and the operating mode of the operating indoor units 113 (whether cooling operation or heating operation). The controller 18 obtains the current cooling load and heating load by analyzing the acquired load information. The cooling load is, for example, the number of operating indoor units 113 operating in the cooling operation mode, the power consumption of the entire indoor unit 113 operating in the cooling operation mode, the cooling output of the heat source unit 111, and the heat source water in the cooling operation. Required heat quantity, flow rate, etc. For the cooling load, a conventional method may be used. The heating load is also calculated in the same way as the cooling load.

  When the cooling load is larger than the heating load, the controller 18 controls the closing of the hot water valve 13b and adjusts the opening degree of the cold water valve 13a so that the temperature of the heat source water supplied to the heat source unit 111 becomes 10 degrees or more. .. In this way, the controller 18 controls the flow path so that the heat source water is supplied to the heat source unit 111 through the heat exchanger 12a, the cold water valve 13a, the thermometer 14, and the pump 16. The heat source water output from the heat source unit 111 passes through the flow meter 17 and is supplied to the heat exchanger 12a.

  By the way, according to the current specifications of the heat source unit, it is necessary to adjust the temperature of the heat source water between 10 degrees and 45 degrees. Therefore, the controller 18 performs temperature adjustment so that the temperature of the heat source water output from the heat exchanger 12a and supplied to the heat source unit 111 becomes 10 degrees or more. The temperature of the heat source water supplied to the heat source unit 111 is measured by the thermometer 14. In addition, the controller 18 operates the inverter 15 to control the flow rate and heat quantity of the heat source water supplied to the heat source unit 111 according to the magnitude of the cooling load, the flow rate measured by the flow meter 17, the output of the heat source unit 111, and the like. Is controlled to adjust the opening / closing degree of the pump 16.

  On the other hand, when the heating load is larger than the cooling load, the controller 18 controls the closing of the cold water valve 13a and adjusts the opening degree of the hot water valve 13b so that the temperature of the heat source water supplied to the heat source unit 111 becomes 45 degrees or lower. .. In this way, the controller 18 controls the flow path so that the heat source water is supplied to the heat source unit 111 through the heat exchanger 12b, the hot water valve 13b, the thermometer 14, and the pump 16. The heat source water output from the heat source unit 111 passes through the flow meter 17 and is supplied to the heat exchanger 12b.

  The reason why the temperature of the heat source water is set to 45 degrees or lower is based on the specifications of the heat exchanger as described above. When the specifications of the heat source unit 111 are changed in the future, the controller 18 may control the temperature so as to meet the specifications. In addition, the controller 18 operates the inverter 15 to control the flow rate and heat quantity of the heat source water supplied to the heat source unit 111 according to the size of the heating load, the flow rate measured by the flow meter 17, the output of the heat source unit 111, and the like. Is controlled to adjust the opening / closing degree of the pump 16.

  When the cooling load and the heating load are the same, either of the valves 13a and 13b may be controlled to be closed to supply cold water or hot water to the heat source unit 111.

  As described above, in the present embodiment, the opening / closing control of the valves 13a and 13b is performed so that the temperature of the heat source water supplied to the heat source unit 111 is in the range of 10 degrees to 45 degrees. When the load is larger than the load, the controller 18 controls to close the hot water valve 13b by giving priority to the operation efficiency of the indoor unit 113 that is performing the cooling operation. On the other hand, when the heating load is larger than the cooling load, the controller 18 controls to close the chilled water valve 13a by giving priority to the operation efficiency of the indoor unit 113 that is in the heating operation. As described above, in the present embodiment, only the heat source water of either cold water or hot water is supplied to the heat source unit 111. Of course, cold water and hot water may be mixed, but the valves 13a and 13b are exclusively controlled so as not to generate mixing loss. It should be noted that the present water-cooled multi air conditioner for buildings can be operated in both cooling operation and heating operation if the temperature of the heat source water supplied to the heat source unit is between 10 degrees and 45 degrees. Simultaneous heating operation is possible.

  In the conventional water-cooled multi air conditioner for buildings, a cooling tower or a boiler was used as a heat source, but in the present embodiment, the temperature of return water from another building 2 is used. And does not need a boiler. That is, since there is no problem with the cost of the cooling tower or the maintenance cost of the boiler and the installation area, it is possible to install the water-cooled multi air conditioner for the building in the building 10 within a certain area of the heating and cooling area. This makes it possible to improve the comfort of each room even in a huge building 10.

  By the way, it is assumed that the building 2 that supplies the return water to the building 10 in the present embodiment is air-conditioned and controlled by the central air-conditioning method as in the conventional case. However, it may be considered that the building 2 is also switched to the building heating / cooling system of the present embodiment and the water-cooled building multi-air conditioner 11 is introduced. In this way, as a result of the building 2 switching to the building heating and cooling system of this embodiment, it is also theoretical that all buildings within a certain area of district heating and cooling will introduce the building heating and cooling system of this embodiment. Above, it is possible. Considering that, the district heating and cooling plant that is currently supplying cold water (7 degrees) and hot water (60 degrees) for central air conditioning uses cold water of 10 degrees or more (outgoing water) and 45 degrees or less according to the specifications of the heat source unit. It is conceivable that the warm water (outgoing water) may be supplied. Then, the building heating and cooling system of the present embodiment described above can also receive heat source water (outgoing water) directly from the district heating and cooling plant. Further, it is not necessary to use the heat exchanger 12 for adjusting the temperature of the heat source water supplied to the heat source unit 111 to 10 degrees or more and 45 degrees or less. Further, in the DHC1, it is not necessary to cool or heat the heat source water more than the current state, which leads to cost reduction.

1 DHC, 2, 10 building, 3, 4, 5, 6 regional piping, 7a, 7b, 8a, 8b mounting position, 11 water-cooled multi air conditioner for building, 12a, 12b heat exchanger, 13a valve (cold water valve), 13b valve (hot water valve), 14 thermometer, 15 inverter, 16 pump, 17 flow meter, 18 controller, 111 heat source unit, 112 diversion controller, 113 indoor unit.

Claims (6)

A water-cooled multi air conditioner for buildings,
A heat exchanger that exchanges heat with return water from another building within a certain area of district heating and cooling to a district heating and cooling plant, and heat source water of the water-cooled building multi-air conditioner,
Control means for controlling the temperature of the heat source water supplied to the heat source unit of the water-cooled multi-air conditioner for buildings using the temperature of the return water from the building,
An air conditioning system for buildings, characterized by having. The heat exchanger is
A cold water heat exchanger for exchanging heat between cold water returned from the other building and heat source water for cold water supplied to the heat source unit,
A hot water heat exchanger for exchanging heat between hot water returned from the other building and heat source water for hot water supplied to the heat source unit;
The building cooling and heating system according to claim 1, further comprising:   The cooling / heating for buildings according to claim 2, wherein the control unit controls a flow path of the heat source water to be supplied to the heat source unit based on load information on cooling and heating acquired from the water-cooled multi-air conditioner for buildings. system.   4. The building according to claim 3, wherein the control unit controls to supply the heat source water, which has been heat-exchanged by the cold water heat exchanger, to the heat source unit when the cooling load is higher than the heating load. Air conditioning system.   4. The building according to claim 3, wherein the control unit controls to supply the heat source water that has been heat-exchanged by the hot water heat exchanger to the heat source unit when the heating load is higher than the cooling load. Air conditioning system. The building cooling and heating system according to claim 1, wherein the control unit controls the flow rate to the water-cooled multi-air conditioner for a building based on the temperature of the heat source water supplied to the heat source unit.

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