JPH0737078Y2 - Air conditioning equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an air conditioner used for a cooling or heating system in a building.

[Prior Art] A conventional air conditioning equipment using a heat exchange tower called a cooling tower is configured as shown in FIG. 6 as an example. In the figure, water as a heat medium is circulated in the main pipeline 1, and a well-known heat exchange tower 2 and a heat pump 3 are provided in the main pipeline 1. The heat pump 3 is configured to cool or heat the heat medium flowing in the pipe 5 of the cold / hot water generation system 4 by utilizing the cold heat or the heat of the heat medium flowing in the main pipe 1. That is, during cooling, the heat medium in the pipeline 5 is cooled and cold water is stored in the heat storage tank 6, and during heating, hot water is stored in the heat storage tank 6. The heat storage tank 6 is provided with a heat exchanger. On the other hand, a heat exchange unit 7 (only one of which is shown in the figure) provided in each air conditioning area is provided with a coil 8 for heat exchange, and the heat exchange between the coil 8 and the heat storage tank 6 is performed. The heat medium in the conduit 9 that connects the container is cooled or heated by the heat storage tank 6, so that cold air or warm air is sent from the heat exchange unit 7 to each air conditioning area.

[Problems to be solved by the invention] Generally speaking, cooling is performed in the summer and heating is performed in the winter. However, in a building where a wide variety of OA devices are installed as in the present day, the OA devices are Depending on the type, it is desirable to cool the installation area. In addition, in a so-called perimeter zone near a window where direct sunlight shines on, local cooling may be required even in winter. However, in the conventional air conditioning equipment shown in FIG. 6, since the cold / hot water generation system 4 is operated as a heating cycle in winter, it is difficult to perform local cooling.

Further, the cooling capacity is uniquely determined by the rated capacity of the heat exchange unit 7, so that the cooling capacity may be insufficient when the summer is extremely hot. Further, when the heat exchange unit 7 is operated at the full rated capacity, if the cooling load increases due to the addition of new OA equipment,
It was not possible to cope with the new cooling load.

Furthermore, since the cooling using the cold / hot water generation system 4 is performed by operating the heat pump 3 even in the intermediate period when the cooling load is small, there is a problem that the operating cost is high.

Therefore, the purpose of the present invention is to be able to exert sufficient cooling capacity during the cooling period, to perform local cooling while maintaining the heating mode during the heating period, and to send from the heat exchange tower during the intermediate period. An object of the present invention is to provide an air conditioning equipment that can perform cooling by a simple cycle using a low temperature heat medium.

[Means for Solving the Problems] In order to achieve the above object, the present inventor has devised an air conditioning equipment having the following configuration. That is, a main pipeline in which a heat medium is circulated, a heat exchange tower provided in the middle of this main pipeline for exchanging heat between the heat medium and the outside air, and a main pipeline provided in the middle of the main pipeline A cold / hot water generation system that generates cold water or hot water by using the cold or hot heat of the heat medium, and a main coil that circulates the heat medium that has been heat-exchanged by the cold / hot water generation system to cool the desired air conditioning area. Alternatively, in an air conditioner equipped with a heat exchange unit that sends out hot air, a main coil control valve capable of adjusting the flow rate of the heat medium flowing in the main coil, and a sub coil provided in the heat exchange unit. , An auxiliary pipeline for taking in a part of the heat medium flowing in the main pipeline by branching from the main pipeline on the outlet side of the heat exchange tower and for returning this heat medium to the main pipeline via the sub-coil. Having a sub-coil control valve capable of adjusting the flow rate of the heat medium flowing in the sub-coil, and opening the sub-coil control valve when the valve opening of the main-coil control valve exceeds a predetermined value during cooling, In the air conditioning equipment, the sub-coil control valve is opened when the opening degree of the main-coil control valve becomes minimum during heating.

[Operation] In the air conditioning equipment having the above configuration, the heating operation is performed by introducing the high-temperature heat medium obtained by the cold / hot water generation system into the main coil during the heating period such as winter. The flow rate of the heat medium flowing in the main coil is adjusted by changing the opening of the main coil control valve. For air-conditioned areas that may be overheated even in winter, by opening the sub-coil control valve when the opening of the main-coil control valve becomes minimum, the low temperature sent from the heat exchange tower A part of the heat medium is taken into the sub coil through the auxiliary pipe, and the auxiliary cooling operation is performed by the sub coil.

During the cooling period such as summer, the cooling operation is performed by introducing the heat medium cooled by the cold / hot water generation system into the main coil. When the cooling capacity is insufficient with the main coil alone, the sub-coil control valve is opened when the opening of the main-coil control valve exceeds a specified value, and a part of the relatively low-temperature heat medium that has passed through the heat exchange tower is opened. Is taken into the sub-coil through the auxiliary pipe, the auxiliary cooling by the sub-coil is performed in addition to the main cooling by the main coil.

At the time when the small-scale cooling cycle is available in time, such as the intermediate period, the cold / hot water generation system is stopped, and a part of the relatively low-temperature heat medium passing through the heat exchange tower is circulated to the sub-coil through the auxiliary pipe. As a result, cooling is performed only by the sub coil.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. The air conditioning equipment 11 shown in FIG. 1 is configured to include a main pipe 12 in which a heat medium is circulated, a heat exchange tower 13 and a heat pump 14 provided in the middle of the main pipe 12. The heat medium flowing through the main pipeline 12 is antifreeze. The heat exchange tower 13 has a closed structure and is installed outside the building such as a building so that the heat medium can exchange heat with the outside air.

The main pipe line 12 includes a forward pipe portion 12a extending from the heat exchange tower 13 to the heat pump 14, and a return pipe portion 12b extending from the heat pump 14 to the heat exchange tower 13. In the case of the present embodiment, a pump 16 for liquid supply and a flow rate adjusting valve 17 are provided in the outward pipe portion 12a.

The heat pump 14 constitutes a part of the cold / hot water generation system 18. The cold / hot water generation system 18 is a pipe line through which water as a heat medium is circulated.
20, a pump 21 for water supply, and a heat storage tank 22 equipped with a heat exchanger
And so on. This heat pump 14
Like the well-known one, it is configured to include a compressor for compressing a heat medium such as CFC gas, a condenser, an evaporator, a directional control valve, a pressure reducing valve, various pipes (all not shown), and the main pipeline.
The heat medium flowing through the pipe 20 of the cold / hot water generation system 18 is heated or cooled by utilizing the cold heat or the heat heat of the heat medium sent from the 12 outward pipe portions 12a.

The heat exchange unit 25 (only one is shown in the figure) provided for each air conditioning area includes a main coil 27 and a sub coil 28 inside a casing 26. Main coil
The heat exchanger 27 of the heat storage tank 22 and the heat exchanger of the heat storage tank 22 are connected to each other by a pipe 30, through which water serving as a heat medium circulates between the main coil 27 and the heat exchanger of the heat storage tank 22. It is supposed to do. A pump 31 for circulating the heat medium and a main coil control valve 32 for adjusting the flow rate of the heat medium are provided in the middle of the pipeline 30.

As illustrated in FIG. 2, the blower 35 incorporated in the casing 26 of the heat exchange unit 25 is driven by the motor 36. Air intake 37 to return air duct 38 (see Fig. 3)
The return air from the air-conditioned area introduced in the
The air is sent from the air blower 39 to the air conditioning area via the main coil 27. That is, the sub coil 28 is the main coil 27.
It is provided on the upstream side of ventilation. A pre-filter 41 and a main filter 42 are arranged on the ventilation upstream side of the sub-coil 28.

Further, the heat exchange unit 25 includes a bypass air passage 45 that bypasses the main coil 27 and the sub coil 28, and a damper 46 that opens and closes the air passage 45. The bypass air passage 45 is provided adjacent to the return air passage 38, but the return air passage 38 and the bypass air passage 45 are partitioned by a partition wall 47. An inlet portion 50 of the bypass air passage 45 opens near the suction side of the sub coil 28, and an outlet portion 51 of the bypass air passage 45 opens near the outlet side of the main coil 27.

An auxiliary pipeline 55 is connected to the sub coil 28. The auxiliary pipeline 55 branches from the outward pipeline 12a of the main pipeline 12 located on the outlet side of the heat exchange tower 13 to reach the inlet of the sub-coil 28.
It is composed of a pipe passage portion 55a, a second pipe passage portion 55b that connects the outlet portion of the sub-coil 28 and the auxiliary tank 56, and a third pipe passage portion 55c that extends from the outlet portion of the auxiliary tank 56 to the main pipe passage 12. Third conduit section 5
5c joins the main conduit 12 between the flow rate adjusting valve 17 and the heat pump 14. Further, a sub-coil control valve 57 is provided to adjust the flow rate of the heat medium flowing in the sub-coil 28.

Next, the operation of the air conditioning equipment having the above configuration will be described.

During the cooling period such as summer, cold water is produced in the cold / hot water generating system 18 by the cooling cycle of the heat pump 14 utilizing the cold heat of the heat medium in the main pipeline 12 flowing in the direction of arrow A in FIG. This cold water flows in the pipe 20 in the direction of arrow B, and the heat storage tank 22
Stored in. The heat medium in the return pipe section 12b, which has passed through the heat pump 14 and has risen in temperature, passes through the heat exchange tower 13 to come into contact with the outside air to be cooled. The cold heat stored in the heat storage tank 22 is heat-exchanged with the heat medium flowing in the pipe line 30 in the direction of arrow C, and the cooled heat medium passes through the main coil 27.

Return air from the air-conditioned area introduced into the air intake 37 by the function of the blower 35 of the heat exchange unit 25 passes through the return air passage 38 and the pre-filter 41 and the main filter.
When passing through 42 and passing through the main coil 27, heat is exchanged with the cold heat of the coil 27, so that the cool air is sent from the blower 35 to a predetermined air conditioning area. The temperature of the air passing through the return air passage 38 is detected by a temperature sensor (not shown), and the opening of the main coil control valve 32 is automatically controlled by a controller using a microcomputer according to the difference between the detected temperature and the set temperature. To be done. For example, as shown by the solid line in FIG. 4, the valve opening of the control valve 32 during cooling is 0 to 100% in proportion to the difference between the return temperature (detected temperature) and the set temperature.
Controlled by the range of. When this control valve 32 is not fully open,
The subcoil control valve 57 is closed. The damper 46 of the bypass air passage 45 is also closed. Instead of detecting the return temperature, the room temperature may be detected by a temperature sensor installed in the air-conditioned area.

In the cooling mode, when the cooling capacity is insufficient with only the main coil 27, that is, the main coil control valve 32
When the room temperature does not drop even when is fully opened, the sub-coil control valve 57 is opened. When the sub-coil control valve 57 is opened, a part of the low-temperature heat medium flowing through the main conduit 12 via the heat exchange tower 13 is partially converted into an auxiliary conduit as indicated by an arrow D in FIG.
It is taken into the first conduit portion 55a of 55 and flows through the sub-coil 28. When the sub coil 28 is cooled in this way,
Return air from the air-conditioned area introduced into the heat exchange unit 25 passes through the main coil 27 while being pre-cooled by the sub-coil 28, so that the cooling capacity is significantly improved. In this way, when the sub coil 28 is used together, the capacity can be expected to increase by about 1.5 times as much as the rated capacity of the main coil 27 alone. The opening degree of the sub-coil control valve 57 is also the fourth
As shown by the solid line in the figure, control is performed in the range of 0 to 100% in proportion to the difference between the return temperature and the set temperature.

The heat medium that has undergone heat exchange by passing through the sub-coil 28 flows into the auxiliary tank 56 through the second conduit 55b, and further through the third conduit 55c at the inlet side of the heat pump 14 at the main conduit 12 To join. For this reason, from the main line 12 to the heat pump
The total flow rate of the heat medium introduced into 14 is constant regardless of the branch flow rate flowing through the sub-coil 28.

On the other hand, during the heating period such as winter, hot water is produced in the cold / hot water generation system 18 by the heating cycle of the heat pump 14 that takes heat from the heat medium flowing in the main pipeline 12, and this hot water is in the direction of arrow B in FIG. Stored in the heat storage tank 22. The heat medium in the main pipe line 12 flowing in the direction of arrow A in FIG. 1 is deprived of heat by passing through the heat pump 14 and its temperature is lowered, but the heat medium is heat-exchanged with the outside air in the heat exchange tower 13 and the temperature is again raised. It is sent to the heat pump 14 in an ascended state. The heat stored in the heat storage tank 22 is heat-exchanged with the heat medium flowing in the direction of arrow C in FIG. 1, and the heat medium whose temperature has risen passes through the main coil 27.

The return air sent from the air conditioning area by the operation of the blower 35 passes through the air intake port 37, the return air passage 38, the prefilter 41, and the main filter 42 in this order, and when passing through the main coil 27, the inside of this coil 27 The hot air is sent from the blower 35 to a predetermined air conditioning area by exchanging heat with the high-temperature heat medium. When passing through the return air passage 38, the temperature of the air is detected by a temperature sensor (not shown). Then, depending on the difference between the detected temperature and the set temperature, for example, as shown by the broken line in FIG. 4, the main coil control valve 32
The opening degree of is controlled in the range of 0 to 100%. This control valve 32
Control valve for subcoil 57
Is kept closed. Further, the damper 46 of the bypass air passage 45 remains closed.

In the heating mode, for example, a place where OA equipment as a heat source is installed or a place where local cooling is required such as a window in the sun, or when the heating load is likely to be overheated, The main coil control valve 32 is closed and the sub coil control valve 57 is opened according to the return temperature. When the subcoil control valve 57 opens,
A part of the heat medium in the main pipe 12 passing through the heat exchange tower 13 passes through the auxiliary pipe 55 as shown by an arrow D in FIG.
Introduced in 28. In the heating mode, the temperature of the heat medium that has passed through the heat exchange tower 13 has risen to some extent, but since it is a temperature that can be used for cooling, by introducing a part of this low temperature heat medium into the sub coil 28. The cold air can be sent from the heat exchange unit 25 to a specific air-conditioned area.

In this way, the sub-coil 28 is cooled by using the low-temperature heat transfer medium sent from the heat exchange tower 13 during the heating period,
Local cooling is possible while the cold / hot water generation system 18 is maintained in the heating cycle. In this case, the sub-coil control valve 57 is opened when the opening degree of the main-coil control valve 32 is minimized, that is, when the blowing of warm air is stopped.

The cold / hot water generation system 18 is stopped in the middle of heating and cooling. When cooling is required during this intermediate period, only the sub-coil control valve 57 is opened. The main coil control valve 32 remains closed. Subcoil control valve 57
When the valve is opened, as shown by an arrow E in FIG. 5, the low-temperature heat medium flowing in the main conduit 12 via the heat exchange tower 13 is taken into the auxiliary conduit 55, and the sub-coil 28 is cooled. It flows into the auxiliary tank 56, and further through the return pipe section 12b, the heat exchange tower 13
Will be returned to. The heat medium that has passed through the heat exchange tower 13 is heat-exchanged with the outside air to lower the temperature to a temperature that can be used for cooling in the interim period, so that by flowing this into the sub-coil 28, cool air is sent to a predetermined air conditioning area. be able to. In this case, cooling is performed with the cold / hot water generation system 18 stopped.

When only ventilation is performed without performing cooling or heating, that is, when both the main coil control valve 32 and the sub coil control valve 57 are closed, the damper 46 is fully opened to open the bypass air passage 45. To be done. In this ventilation mode, the blower 35 allows the air intake 37
The return air introduced into the intake air takes the route of the return air passage 38 → the pre-filter 41 → the main filter 42 → the bypass air passage inlet 50 → the bypass air passage 45 → the bypass air passage outlet 51 → the blower 35 and again. It is sent to the air-conditioned area. In this ventilation mode, since the air bypasses the main coil 27 and the sub coil 28 and mainly passes through the bypass air passage 45, the pressure loss can be reduced.

[Advantages of the Invention] According to the present invention, during the cooling period, the main coil and the sub-coil can be operated at the same time to perform strong cooling, and during the heating period, cooling of a specific area can be performed while maintaining the heating cycle. In the intermediate period, cooling using the heat medium from the heat exchange tower can be performed.

Therefore, while compensating for the lack of capacity during the cooling period,
It is possible to easily cope with the increase in air-conditioning load due to new introduction of OA equipment, etc., and also to prevent local overheating during heating.
Also, in the middle period, a low-cost operation is possible by a simple cooling cycle that does not use a chiller unit. Moreover, as the low-temperature heat medium introduced into the sub-coil, the low-temperature heat medium passing through the heat exchange tower can be used as it is, and no special cold heat source is required.

[Brief description of drawings]

FIG. 1 is a system diagram of an air conditioning equipment showing an embodiment of the present invention, and FIGS. 2 and 3 are vertical front views and vertical side views showing the inside of the heat exchange unit in FIG. 1, respectively. The figure is first
The figure which shows the relationship between the opening and the temperature of the coil control valve in the figure,
FIG. 5 is a system diagram showing the flow of the heat medium in the intermediate period, 6th
The figure is a system diagram of conventional air conditioning equipment. 11 …… Air conditioning equipment, 12 …… Main pipeline, 13 …… Heat exchange tower,
14 …… Heat pump, 18 …… Cold and hot water generation system, 22 …… Heat storage tank, 25 …… Heat exchange unit, 27 …… Main coil, 28…
… Sub coil, 32 …… Main coil control valve, 38 …… Return air duct, 45 …… Bypass air duct, 46 …… Damper, 55…
… Auxiliary line, 57… Control valve for subcoil.

Claims (3)

[Scope of utility model registration request] 1. A main pipe line through which a heat medium is circulated, a heat exchange column provided in the middle of the main pipe line for exchanging heat between the heat medium and the outside air, and a main pipe line provided in the middle of the main pipe line. A cold / hot water generation system for generating cold water or hot water by utilizing cold heat or hot heat of a heat medium flowing inside, and a main coil for circulating the heat medium heat-exchanged by the cold / hot water generation system are provided, and desired air conditioning is provided. In an air conditioner equipped with a heat exchange unit for sending cold air or warm air to the area, a main coil control valve capable of adjusting the flow rate of the heat medium flowing in the main coil, and the heat exchange unit provided in the heat exchange unit. A sub-coil and a part of the heat medium flowing in the main pipe by branching from the main pipe on the outlet side of the heat exchange tower and assisting in recirculating this heat medium to the main pipe through the sub-coil. It has a pipeline and a sub-coil control valve capable of adjusting the flow rate of the heat medium flowing in the sub-coil, and the sub-coil control valve is opened when the valve opening of the main-coil control valve exceeds a predetermined value during cooling. An air conditioner characterized by opening the valve and opening the sub coil control valve when the opening of the main coil control valve becomes minimum during heating. 2. The air conditioning equipment according to claim 1, wherein the sub-coil is arranged on the upstream side of ventilation in the heat exchange unit, and the main coil is arranged on the downstream side of ventilation. 3. The heat exchange unit is provided with a bypass air passage that bypasses the main coil and the sub coil and a damper that opens and closes the air passage, and both the main coil control valve and the sub coil control valve are provided. The air conditioner according to claim 1, wherein the damper is opened when the damper is closed.