JP2006258406A - Water cooled heat pump type subterranean heat utilizing air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water cooled heat pump type subterranean heat utilizing air conditioning system capable of controlling temperature in a plurality of spaces to be air-conditioned having different temperature control zones at low cost and of eliminating waste in facilities and operation to reduce cost. <P>SOLUTION: Piping is performed to circulate a heat medium in a heat source side water heat exchanger of a water cooled heat pump type air conditioner 3 and a subterranean heat exchanger for adjusting temperature of the heat medium by subterranean heat. A plurality of air supply side air heat exchangers 12 of the water cooled heat pump type air conditioner 3 are used in common in the heat source side water heat exchanger 14. The plurality of air supply side air heat exchangers 12 are classified into the heat exchanger for controlling low temperature and the heat exchanger for controlling high temperature, are mutually communicated to supply air cooled by the air supply side air heat exchanger 12 for controlling low temperature into a low temperature control side space L to be air-conditioned, and are mutually communicated to supply air heated by the air supply side air heat exchanger 12 for controlling high temperature into a high temperature control side space H to be air-conditioned. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water-cooled heat pump type underground heat utilization air conditioning system.

  Air conditioning for agricultural products such as greenhouses and low-temperature warehouses for grains, and air conditioning for buildings where the solar radiation load varies greatly depending on the orientation, have a wider temperature range to be controlled than usual. The temperature is controlled. However, when there are a plurality of air-conditioned spaces having different temperature control areas, an air conditioner must be installed for each air-conditioned space, resulting in a problem that the equipment cost and the operating cost are increased.

JP 2002-267283 A JP-A-61-110859

  Also, a heat source side heat exchanger, a compressor, and a plurality of air supply side heat exchangers are provided. For example, air cooling (cooling) is performed with one air supply side heat exchanger, and air is heated with the other air supply side heat exchanger. As a heat pump circuit for air conditioning that can be (heated), there is one disclosed in JP-A-61-110859. The refrigerant outlet of the compressor is connected to the high-pressure gas pipe, the refrigerant inlet is connected to the low-pressure gas pipe, and one of the refrigerant inlets and outlets of the heat source side heat exchanger is switchably connected to the high-pressure gas pipe and the low-pressure gas pipe. The other of the refrigerant inlet / outlet of the heat source side heat exchanger is connected to the liquid pipe via an expansion valve, and one of the refrigerant inlet / outlet of each air supply side heat exchanger is connected to the high pressure gas pipe and the low pressure gas pipe in a switchable manner, The other refrigerant inlet / outlet of each air supply side heat exchanger is connected to a liquid pipe via an expansion valve. In such a configuration, there is a problem that an expansion valve is required for each heat exchanger, the circuit is complicated, and it takes time and effort to manufacture. In addition, when an electronic expansion valve is used, individual expansion valve control is required and the control becomes complicated.

  In order to solve the above problems, the present invention provides a heat-source-side water heat exchanger in a water-cooled heat pump type air conditioner that supplies air to a plurality of air-conditioned spaces having different temperature control areas, and a ground in which the temperature of the heat medium is adjusted by underground heat. A medium heat exchanger and a piping so that a heat medium circulates, and a plurality of air supply side air heat exchangers of the water-cooled heat pump type air conditioner are shared by the heat source side water heat exchanger, The air supply side air heat exchanger is divided into low temperature control and high temperature control, and the air cooled by the low temperature control air supply side air heat exchanger is placed in the low temperature control side air conditioning space of the plurality of air conditioned spaces. The air is communicated so as to be supplied with air, and the air heated by the high-temperature control supply-side air heat exchanger is connected to the high-temperature control-side air-conditioned spaces of the plurality of air-conditioned spaces. Is the main feature.

According to the first aspect of the present invention, it is possible to control the temperature of a plurality of air-conditioned spaces having different temperature control areas with one air conditioner, and to reduce the equipment cost and the operation cost. Energy saving is achieved because refrigerant evaporation and refrigerant condensation are simultaneously performed in the common heat source side water heat exchanger, and the equipment cost can be reduced because the load on the heat source side water heat exchanger and the equipment (capacity) of the underground heat exchanger can be reduced. And reduce operating costs. Moreover, since the underground heat exchanger is used as a heat source, CO2 is not discharged and it is clean as compared with a heat source device such as a boiler. Since the heat source side water heat exchanger is shared, the number of parts can be reduced and the size can be reduced.
According to the invention of claim 2, only one expensive expansion valve is required, the structure is simplified and piping work is facilitated, so that the size can be reduced, the cost can be reduced, and the control is also simplified.
According to the invention of claim 3, since the pressure loss is reduced and the heat exchange efficiency is improved, a small blower can be used and noise can be reduced. The air supply side air heat exchanger can also be miniaturized and the air conditioner can be made compact.

  1-4 is one Example of the water-cooling heat pump type ground-heat utilization air-conditioning system of this invention, A solid line and a dotted line white arrow show a wind direction. This air conditioning system includes a heat source side water heat exchanger 14 that uses a heat medium as a heat source in the water-cooled heat pump type air conditioner 3 that supplies air to a plurality of air-conditioned spaces having different temperature control areas, and the heat medium is heated to underground heat. The ground heat exchanger 9 to be adjusted is piped so that the heat medium circulates, and the heat medium such as heat source water is sent in the direction of the arrow by a water pump (not shown) and is supplied to the water-cooled heat pump air conditioner 3. After heat exchange in the heat source side water heat exchanger 14, the temperature is adjusted in the underground heat exchanger 9, and these are circulated. The underground heat exchanger 9 is buried under the building or underground such as outdoors, and exchanges heat with the underground heat. In the example shown in the drawing, the underground heat exchanger 9 has a U-tube type, but other types may be used.

  A plurality of (two in the illustrated example) supply-side air heat exchangers 12 of the water-cooled heat pump air conditioner 3 are shared by the heat source-side water heat exchanger 14 and a plurality of supply-side air heat exchangers 12. Are divided into those for low temperature control and for high temperature control, and communicated so that the air cooled by the low temperature control air supply side air heat exchanger 12 is supplied to the low temperature control side air conditioning space L of the plurality of air conditioned spaces. In addition, the air heated by the high-temperature control air supply side air heat exchanger 12 is communicated with the high-temperature control-side air-conditioned space H of the plurality of air-conditioned spaces. An example of the low-temperature control-side air-conditioned space L is a storage warehouse for potatoes and grains, and an example of the high-temperature control-side air-conditioned space H is a greenhouse for vegetable and fruit cultivation. L and H can be freely used when they are provided on different floors in the same building or when they are provided on the same floor isolated from each other. As an example of the temperature control region, the low-temperature control-side air-conditioned space L is 5 ° C to 15 ° C, and the high-temperature control-side air-conditioned space H is 20 ° C to 35 ° C.

  The casing 11 of the water-cooled heat pump type air conditioner 3 is provided with a plurality of air supply side air passages 15 (two in the illustrated example), and refrigerant evaporation / refrigerant condensation switching is individually performed for each air supply side air passage 15. Free air supply side air heat exchanger 12 and blower 13 are provided, and one water-cooled heat pump type air conditioner 3 is used to cool in low-temperature control-side air-conditioned space L and to heat in high-temperature control-side air-conditioned space H. It can be operated at the same time. Further, the humidifier 18 adjusts the humidity as needed separately in the casing 11 or in the room (not shown). The air supply side air passage 15 provided with the low temperature control air supply side air heat exchanger 12 is connected to the low temperature control side air-conditioned space L via an air supply path 5 and a return air path 6 such as a duct. A supply air passage 5 provided with a high temperature control air supply side air heat exchanger 12 is communicated with an air supply passage 5 such as a duct and a return air passage 6 so as to circulate with the high temperature control side air-conditioned space H. Communicate via The casing 11 is provided with an outside air inlet that can control the air volume, and communicates with the air supply side air passage 15 so that the outside air can be ventilated through the air supply side air heat exchanger 12. When exhaust or ventilation is required, the exhaust port 16 or a ventilation fan (not shown) is used. In the example shown, return air and outside air are mixed and supplied, but the configuration can be changed to only return air circulation or outside air supply. The air volume can be adjusted freely.

  The water-cooled heat pump of the water-cooled heat pump type air conditioner 3 repeats the steps of evaporation, compression, condensation and expansion with respect to the circulating refrigerant, and the refrigerant absorbs heat in the refrigerant evaporation step with respect to the air and heat medium exchanged with the circulating refrigerant. Each of them performs heat dissipation in the condensation process, and includes a heat source side water heat exchanger 14 and a plurality of air supply side air heat exchangers 12 that perform the evaporation process and the condensation process of the circulating refrigerant, and a compressor 19 that compresses the circulating refrigerant. And an expansion valve 20 such as an automatic temperature expansion valve or an electronic expansion valve for expanding the circulating refrigerant, a low pressure liquid pipe A and a high pressure liquid pipe B, a low pressure gas pipe C and a high pressure gas pipe D, and a compressor 19. The refrigerant outlet of the compressor 19 is connected to the high pressure gas pipe D, the refrigerant inlet of the compressor 19 is connected to the low pressure gas pipe C, and one of the refrigerant inlets and outlets of the heat source side water heat exchanger 14 is connected to the high pressure gas pipe D and the low pressure gas pipe C. Branches via on-off valves 23a and 23b Subsequently, the high-pressure gas pipe D and the low-pressure gas pipe C are connected so as to be switchable, and the other refrigerant inlet / outlet of the heat source side water heat exchanger 14 is branched and connected to the high-pressure liquid pipe B and the low-pressure liquid pipe A. The first branch pipe on the liquid pipe side is provided with a first check valve 21a that allows the refrigerant to flow only in the direction of the high pressure liquid pipe, and the second branch pipe on the low pressure liquid pipe side has the refrigerant only in the direction of the heat source side water heat exchanger. The second check valve 21b is provided to connect the high-pressure liquid pipe B and the low-pressure liquid pipe A so that they can be switched, and the other refrigerant inlet / outlet of the heat source side water heat exchanger 14 is connected to the first and second branch pipes. An on-off valve 25 is provided between them.

  One of the refrigerant inlets and outlets of each air supply side air heat exchanger 12 is branched and connected to the high-pressure gas pipe D and the low-pressure gas pipe C via the open / close valves 23a and 23b, and is connected to the high-pressure gas pipe D and the low-pressure gas pipe C. The other refrigerant inlet / outlet of each air supply side air heat exchanger 12 is branched and connected to the high pressure liquid pipe B and the low pressure liquid pipe A, and the high pressure liquid is connected to the third branch pipe on the high pressure liquid pipe side. A third check valve 22a for flowing the refrigerant only in the pipe direction is provided, and a fourth check valve 22b for flowing the refrigerant only in the direction of the air supply side air heat exchanger is provided in the fourth branch pipe on the low pressure liquid pipe side. The high-pressure liquid pipe B and the low-pressure liquid pipe A are switchably connected, and an on-off valve 24 is provided between the other refrigerant inlet / outlet of each air supply side air heat exchanger 12 and the third and fourth branch pipes, The high pressure liquid pipe B and the low pressure liquid pipe A are connected via the expansion valve 20. If the first, second, third, and fourth check valves 21a, 21b, 22a, and 22b are thus provided, the other refrigerant inlet / outlet of each air supply side air heat exchanger 12 and the high-pressure liquid pipe are provided. Control of connection switching between B and the low-pressure liquid pipe A, and control of connection switching between the other refrigerant inlet / outlet of the heat source side water heat exchanger 14, the high-pressure liquid pipe B, and the low-pressure liquid pipe A are not necessary, and This eliminates the need for expensive three-way valves and electromagnetic on-off valves, thus reducing costs. Although not shown, when the expansion valve 20 is an electronic expansion valve, the expansion valve is operated and controlled by the refrigerant temperature and the refrigerant pressure of the compressor 19. As the on-off valves 24, 23a, 23b, 25, electromagnetic valves or the like are used. The heat transfer tube of the air supply side air heat exchanger 12 is preferably an elliptic tube with little pressure loss, but may be a circular tube. The heat source side water heat exchanger 14 is a plate type configured such that, for example, a plurality of heat transfer plates (plates) are stacked and a heat medium and a refrigerant alternately flow between the heat transfer plates and the heat transfer plates to exchange heat with each other. A heat exchanger is used. The air-conditioning air is cooled or heated by the air supply side air heat exchanger 12 of the water-cooled heat pump, and air is supplied to each air-conditioned space for air conditioning.

  For example, air heating (heating operation) is performed by the supply-side air heat exchanger 12 for high-temperature control, and air cooling (cooling operation) is performed by the supply-side air heat exchanger 12 for low-temperature control, so that the heating load and the cooling load are reduced. If there is a difference and the cooling load is larger, the high-pressure gas pipe-side on / off valve 23a and the low-pressure gas pipe-side on / off valve 23b of the refrigerant inlet / outlet of the heat source side water heat exchanger 14 are opened and the high-temperature control is performed. Open / close valve 23a on one high-pressure gas pipe side and close low-pressure gas pipe side open / close valve 23b of the refrigerant inlet / outlet of the air supply side air heat exchanger 12 for use, and supply air air heat exchanger for low temperature control The on-off valve 23a on one high-pressure gas pipe side of the refrigerant inlet / outlet 12 is closed, the on-off valve 23b on the low-pressure gas pipe side is opened, and the on-off valves 24 and 25 are opened. As a result, the refrigerant is diverted from the compressor 19 to the heat source side water heat exchanger 14 and the supply side air heat exchanger 12 for high temperature control in a high pressure gas state, and is condensed and joined in a high pressure liquid state. The flow is reduced to 20 and the pressure is reduced to flow in the low-pressure liquid state to the supply-side air heat exchanger 12 for low-temperature control, evaporated and returned to the compressor 19 in the low-pressure gas state, and this cycle is repeated. In this manner, the supply air is heated by the supply-side air heat exchanger 12 for high temperature control, and the supply air is cooled by the supply-side air heat exchanger 12 for low temperature control.

  Further, air heating (heating operation) is performed by the supply-side air heat exchanger 12 for high-temperature control, and air cooling (cooling operation) is performed by the supply-side air heat exchanger 12 for low-temperature control. When there is a difference and the heating load is larger, one of the refrigerant inlets and outlets of the heat source side water heat exchanger 14 is closed with the high pressure gas pipe side open / close valve 23a closed and the low pressure gas pipe side open / close valve 23b open to control the high temperature. Open / close valve 23a on one high-pressure gas pipe side and close low-pressure gas pipe side open / close valve 23b of the refrigerant inlet / outlet of the air supply side air heat exchanger 12 for use, and supply air air heat exchanger for low temperature control The on-off valve 23a on one high-pressure gas pipe side of the refrigerant inlet / outlet 12 is closed, the on-off valve 23b on the low-pressure gas pipe side is opened, and the on-off valves 24 and 25 are opened. As a result, the refrigerant flows from the compressor 19 to the supply side air heat exchanger 12 for high temperature control in the high pressure gas state, condenses and flows to the expansion valve 20 in the high pressure liquid state, and decompresses to the heat source side in the low pressure liquid state. The flow is divided into the water heat exchanger 14 and the supply-side air heat exchanger 12 for low-temperature control, and each of them is evaporated and merged in a low-pressure gas state and returned to the compressor 19, and this cycle is repeated. In this way, the supply air is heated by the supply-side air heat exchanger 12 for high-temperature control, and the supply air is cooled by the supply-side air heat exchanger 12 for low-temperature control. Further, when the heating load and the cooling load are balanced, by closing the on-off valve 25, the cooling / heating simultaneous operation can be performed without using the heat source side water heat exchanger 14, thereby saving energy.

  In addition, this invention is not limited to the thing of a figure example, The low temperature control side air-conditioned space L, the high temperature control side air-conditioned space H, the air supply side ventilation path 15, the air supply side air heat exchanger 12, the air blower 13, opening and closing The number of the valves 24, 23a, 23b and the third and fourth check valves 22a, 22b can be increased or decreased, and the open / close valve 25 can be omitted. One of the refrigerant inlets and outlets of the air supply side air heat exchanger 12 is branched and connected to the high-pressure gas pipe D and the low-pressure gas pipe C via a three-way valve so that the high-pressure gas pipe D and the low-pressure gas pipe C can be switched. Or one of the refrigerant inlets and outlets of the heat source side water heat exchanger 14 is branched and connected to the high pressure gas pipe D and the low pressure gas pipe C via a three-way valve to connect the high pressure gas pipe D and the low pressure gas pipe C to each other. You may connect so that switching is possible. Similarly, the other refrigerant inlet / outlet of the air supply side air heat exchanger 12 is branched and connected to the high pressure liquid pipe B and the low pressure liquid pipe A via a three-way valve, and switched to the high pressure liquid pipe B and the low pressure liquid pipe A. The other side of the refrigerant inlet / outlet of the heat source side water heat exchanger 14 is branched and connected to the high pressure liquid pipe B and the low pressure liquid pipe A via a three-way valve so that the high pressure liquid pipe B and the low pressure liquid pipe A are connected. May be connected to be switchable.

The perspective view of a water-cooling heat pump type underground heat utilization air-conditioning system. The same side view. The front view of a water cooling heat pump type air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS FIG.

Explanation of symbols

3 Water-cooled heat pump type air conditioner 9 Ground heat exchanger 12 Supply air air heat exchanger 14 Heat source side water heat exchanger 19 Compressor 20 Expansion valve A Low pressure liquid pipe B High pressure liquid pipe C Low pressure gas pipe D High pressure gas pipe L Low-temperature controlled air-conditioned space H High-temperature controlled air-conditioned space

Claims (3)

  The heat source side water heat exchanger 14 in the water-cooled heat pump type air conditioner 3 that supplies air to a plurality of air-conditioned spaces with different temperature control areas, and the underground heat exchanger 9 that adjusts the temperature of the heat medium with underground heat, Piping is performed so that the heat medium circulates, and the plurality of air supply side air heat exchangers 12 of the water-cooled heat pump air conditioner 3 are shared by the heat source side water heat exchanger 14 and a plurality of the air supply sides The air heat exchanger 12 is divided into low temperature control and high temperature control, and the air cooled by the low temperature control air supply side air heat exchanger 12 is supplied to the low temperature control side air conditioning space L of the plurality of air conditioned spaces. The air is communicated so as to be supplied with air, and the air heated by the high-temperature control supply-side air heat exchanger 12 is supplied to the high-temperature control-side air-conditioned spaces H of the plurality of air-conditioned spaces. A water-cooled heat pump type ground-heated air conditioning system characterized by communication Beam.   A water-cooled heat pump of the water-cooled heat pump type air conditioner 3 includes a heat source side water heat exchanger 14 and a plurality of air supply side air heat exchangers 12 that perform an evaporation process and a condensation process of the circulating refrigerant, and a compressor 19 that compresses the circulating refrigerant. And an expansion valve 20 for expanding the circulating refrigerant, a low pressure liquid pipe A and a high pressure liquid pipe B, a low pressure gas pipe C and a high pressure gas pipe D, and the refrigerant outlet of the compressor 19 is connected to the high pressure gas pipe And the refrigerant inlet of the compressor 19 is connected to the low pressure gas pipe C, and one of the refrigerant inlets and outlets of the heat source side water heat exchanger 14 is switched to the high pressure gas pipe D and the low pressure gas pipe C. The other refrigerant inlet / outlet of the heat source side water heat exchanger 14 is connected to the high pressure liquid pipe B and the low pressure liquid pipe A in a freely switchable manner, and the refrigerant of each supply side air heat exchanger 12 is connected. One of the inlets and outlets is connected to the high pressure gas pipe D and the low pressure gas. The other refrigerant inlet / outlet of each air supply side air heat exchanger 12 is switchably connected to the high pressure liquid pipe B and the low pressure liquid pipe A, and is connected to the high pressure liquid pipe B. The water-cooled heat pump type underground heat-use air conditioning system according to claim 1, wherein the low-pressure liquid pipe A is connected via the expansion valve 20.   The water-cooled heat pump type underground heat-use air conditioning system according to claim 1 or 2, wherein the heat transfer tube of the air supply side air heat exchanger 12 is an elliptical tube.

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