JP6455867B2 - Water heat source outside air treatment unit with heat pump - Google Patents

Description

  The present invention relates to a water heat source outside air treatment unit with a heat pump, and more particularly to a water heat source outside air treatment unit with a heat pump that uses geothermal heat as heat source water.

  Conventionally, as an outside air processing unit using heat source water, for example, as disclosed in Patent Document 1 and Patent Document 2, there is a combination of a fan coil and a so-called heat pump as a refrigeration cycle.

  In the outside air processing unit of Patent Document 1, for example, heat source water that has been heat exchanged with outside air by a fan coil using heat source water and heat exchanged by a fine coil is further used for heat exchange by a heat pump.

  Further, in the outside air processing unit of Patent Document 2, for example, heat source water is used to exchange heat with return air using a fan coil, and heat source water exchanged using a fine coil is further exchanged with outside air using another fan coil. Used for heat exchange in heat pumps. Then, the outside air cooled and dehumidified by the refrigerant of the heat pump is supplied.

JP 2005-69552 A JP 2008-70097 A

  By the way, in recent years, an outside air treatment unit using geothermal heat that can obtain stable heat source water at around 20 ° C. ± 5 ° C. throughout the year has been studied.

  However, in the outside air processing unit disclosed in Patent Literature 1 and Patent Literature 2, cold water of about 10 ° C. is used as the heat source water. Therefore, in the outside air processing unit disclosed in Patent Document 1 and Patent Document 2, water at around 20 ° C. cannot be used as heat source water.

  If water of about 20 ° C. is used as the heat source water of the outside air processing unit of Patent Document 2, the temperature of the heat source water increases by 5 ° C., for example, due to heat exchange in the fan coil and heat exchange in other fan coils. If it does, the temperature of the heat source water in a heat pump will be about 30 degreeC. The efficiency of the heat pump in this case is reduced compared to the case where 20 ° C. water is used for heat exchange in the heat pump.

  Therefore, in the use of the heat source water derived from the geothermal heat, it is mainly used for heat exchange in the heat pump, and the entire outside air processing unit including the fan coil cannot be efficiently used.

  Therefore, the present inventors use, for example, about 20 ° C. heat source water in the heat pump for effective use of underground heat in the outside air treatment unit, and at the same time use the heat source water for heat exchange in the fan coil, We paid attention to the fact that heat source water, that is, underground heat, can be used efficiently.

  The present invention has been made in view of such points, and in an outside air processing unit with a heat pump that performs outside air processing using heat source water, it is an object to increase the efficiency of the outside air processing unit by using underground heat. Yes.

The present invention for achieving the above object is an outside air treatment unit with a heat pump that performs outside air treatment using heat source water, and passes the heat source water from the ground and the passed heat source water into the ground. A fan coil provided in the heat source water pipe to be returned and for exchanging heat between the air sucked into the blower and the heat source water in the heat source water pipe, and another branch branched from the upstream side of the fan coil in the heat source water pipe A heat pump water-to-refrigerant heat exchanger that is provided in the heat source water pipe and performs heat exchange between the heat source water in the other heat source water pipe and the refrigerant in the refrigerant pipe connected to the compressor, and the fan coil And a refrigerant-to-air heat exchanger that is provided on the downstream side of the blower and exchanges heat between the air sucked into the blower and the refrigerant in the refrigerant pipe, and more than the refrigerant-to-air heat exchanger. Provided on the downstream side of the blower, A reheating air heat exchanger that reheats the air sucked into the blower, and the reheating air heat exchanger is connected in series to the heat source water pipe on the downstream side of the fan coil. Contact is, the passing water of the heat source water to the reheating air heat exchanger, said controlled by fan coil upstream of the flow rate variable heat source water pump provided in the heat source water pipe is characterized in Rukoto.

According to the present invention, a heat source parallel to a fan coil that performs heat exchange with the heat source water and a water-to-refrigerant heat exchanger for heat pump that performs heat exchange between the heat source water and the refrigerant in the refrigerant pipe. Since water is supplied, for example, even when heat source water using geothermal heat at around 20 ° C. is used, water at around 20 ° C. can be supplied as heat source water used for heat exchange with a heat pump. it can. Therefore, the heat pump can be operated at a high efficiency as compared with the case where the heat source water after heat exchange is used by the fan coil. As a result, the efficiency of the outside air processing unit can be increased .

  ADVANTAGE OF THE INVENTION According to this invention, in the external air processing unit with a heat pump which performs external air processing using heat source water, efficiency improvement of an external air processing unit can be achieved using underground heat.

It is a systematic diagram which shows the outline of a structure of the external air processing unit which concerns on this Embodiment. It is a systematic diagram which shows the outline of a structure of the external air processing unit which concerns on other embodiment. It is a systematic diagram which shows the outline of a structure of the external air processing unit which concerns on other embodiment. It is a systematic diagram which shows the outline of a structure of the external air processing unit which concerns on other embodiment.

  Embodiments of the present invention will be described below. FIG. 1 shows an example of an embodiment of an outside air processing unit 1 according to the present invention. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1, the outside air processing unit 1 includes a heat pump circuit unit A, a blower 10, a heat exchange unit B that performs heat exchange with the air on the suction side of the blower, and a control unit C.

  The heat pump circuit unit A includes a compressor 20, a heat pump water-to-refrigerant heat exchanger 21 that performs heat exchange between heat source water in a heat source water pipe 40 described later and refrigerant supplied from the compressor 20, and expansion A valve 22 and a refrigerant-to-air heat exchanger 23 that performs heat exchange between the refrigerant and air are provided, and are connected to the refrigerant pipe 24 in this order from the outlet side of the compressor.

  An accumulator 25 is provided on the refrigerant pipe 24 on the downstream side of the refrigerant-to-air heat exchanger 23. On the downstream side of the accumulator 25 in the refrigerant pipe 24, heat exchange is performed between the refrigerant in the refrigerant pipe 24 after passing through the water-to-refrigerant heat exchanger 21 for the heat pump and the refrigerant in the refrigerant pipe 24 after passing through the accumulator 25. A refrigerant-to-refrigerant heat exchanger 26 is provided. The refrigerant pipe 24 on the downstream side of the refrigerant-to-refrigerant heat exchanger 26 is connected to the compressor 20 again. That is, the refrigerant pipe 24 constitutes a circulation system. The refrigerant flowing through the refrigerant pipe 24 is converted into a high-temperature and high-pressure gas state by the compressor 20 and then condensed in the heat pump water-to-refrigerant heat exchanger 21 by heat exchange with heat source water in the branch pipe 50 described later. To do. Thereafter, the refrigerant passes through the refrigerant-to-refrigerant heat exchanger 26 and is depressurized by the expansion valve 22. Then, heat is exchanged by the refrigerant-to-air heat exchanger 23 to evaporate. Thereafter, the evaporated refrigerant passes through the accumulator 25 and the refrigerant-to-refrigerant heat exchanger 26 and is again brought into a high-temperature and high-pressure state by the compressor 20.

  The heat exchanging unit B includes a fan coil 30 that exchanges heat between air sucked into the blower 10 and heat source water in a heat source water pipe 40 to be described later, and refrigerant to air that constitutes a part of the heat pump circuit unit A. A heat exchanger 23 and a reheating air heat exchanger 31 that reheats the air sucked into the blower 10 are provided. The fan coil 30, the refrigerant-to-air heat exchanger 23, and the reheating air heat exchanger 31 are provided in this order from the upstream side to the downstream side of the blower 10.

  A heat source water pipe 40 through which the heat source water supplied from the heat source water pump 32 is passed is connected to the fan coil 30. As the heat source water pump 32 according to the present embodiment, one having a variable flow rate is used. Moreover, the heat source water in this Embodiment shall be maintained by predetermined | prescribed temperature, for example, about 20 degreeC, for example by underground heat, for example. Note that the fan coil 30 in the present embodiment is provided on the outlet side of the fan coil 30 when, for example, 20 ° C. heat source water is passed under the condition that the outside air has a dry bulb temperature of 32 ° C. and a wet bulb temperature of 28 ° C. The heat transfer area is determined so that the air has a dry bulb temperature of 24.5 ° C. and a wet bulb temperature of 24.5 ° C., and the temperature of the heat source water at the outlet side of the fan coil 30 becomes 23 ° C. In the refrigerant-to-air heat exchanger 23 in the present embodiment, for example, the air conditions at the outlet side of the fan coil 30, that is, at the inlet of the refrigerant-to-air heat exchanger 23 are the dry bulb temperature 24.5 ° C. and the wet bulb temperature 24. When the temperature is .5 ° C., the compressor 20 of the heat pump circuit section A is set so that the air at the outlet side of the refrigerant to air heat exchanger 23 has a dry bulb temperature of 12.0 ° C. and a wet bulb temperature of 11.9 ° C. The heat transfer area of the refrigerant-to-air heat exchanger 23 is determined so as to satisfy such a temperature condition.

  The outlet side of the fan coil 30 of the heat source water pipe 40 is connected to the reheating air heat exchanger 31. That is, the fan coil 30 and the reheating air heat exchanger 31 are connected to the heat source water pipe 40 in this order from the upstream side to the downstream side. In the reheat air heat exchanger 31 in the present embodiment, for example, the air condition at the outlet side of the fan coil 30, that is, at the reheat air heat exchanger 31 inlet is a dry bulb temperature of 12.0 ° C. and a wet bulb. When the temperature is 11.9 ° C. and the temperature of the heat source water supplied to the reheating air heat exchanger 31 is 23 ° C., the air at the outlet side of the reheating air heat exchanger 31 is the dry bulb temperature. The heat transfer area is determined so that the temperature of the refrigerant at the outlet side of the reheat air heat exchanger 31 is 21.1 ° C., which is 19.0 ° C. and the wet bulb temperature is 14.5 ° C. The temperature of the heat source water described above and the design conditions of the equipment such as the fan coil 30, the refrigerant-to-air heat exchanger 23, and the reheating air heat exchanger 31 are merely examples, and are limited to the contents of the present embodiment. It is not something.

  Between the fan coil 30 and the heat source water pump 32 in the heat source water pipe 40, a heat source water three-way valve 41 for controlling the flow of the heat source water to the fan coil 30 is provided. A bypass pipe 42 that bypasses the fan coil 30 via the heat source water three-way valve 41 is provided from the heat source water pipe 40, and the bypass pipe 42 and the heat source water pipe 40 are on the outlet side of the reheat air heat exchanger 31. Connected with. The heat source water pipe 40 that has joined the bypass pipe 42 is connected to the ground, for example, and the heat source water that has undergone heat exchange with the underground heat is supplied again to the heat source water pipe 40 by the heat source water pump 32.

  A branch pipe 50 as another heat source water pipe is branched from the upstream side of the heat source water pump 32 in the heat source water pipe 40. The branch pipe 50 is provided with a refrigerant heat exchanger pump 51. The branch pipe 50 is connected to the heat pump water-to-refrigerant heat exchanger 21 on the outlet side of the refrigerant heat exchanger pump 51, and heat exchange between the refrigerant on the outlet side of the compressor 20 and the heat source water is performed. For example, the branch pipe 50 joins the bypass pipe 42 and the heat source water pipe 40 after joining, and is returned to the ground. A heat source water temperature sensor 52 that measures the temperature of the heat source water flowing in the heat source water pipe 40 is provided upstream of the branch point of the branch pipe 50 in the heat source water pipe 40. Note that the branch pipe 50 does not necessarily have to merge with the heat source water pipe 40.

  On the upstream side of the fan 10 in the fan coil 30, for example, an outside air temperature sensor 60 that measures the temperature of the outside air is provided. Further, on the upstream side of the blower 10 and downstream of the reheating air heat exchanger 31, that is, between the blower 10 and the reheating air heat exchanger 31, a reheating air heat exchanger 31 is provided. A supply air temperature sensor 61 for measuring the temperature of the air after heat exchange is provided.

  Measurement results of the outside air temperature sensor 60 and the supply air temperature sensor 61 are input to the control unit C. Further, the control unit C includes each device of the outside air processing unit 1 such as the discharge flow rate of the compressor 20 and the heat source water pump 32 and the heat source water three-way valve 41 based on the measurement result of each sensor input to the control unit C. The control program is stored. Further, the control unit C is provided with an operation unit (not shown) for switching, for example, a set temperature of the supply air.

  The outside air processing unit 1 according to the present embodiment is configured as described above. Next, an outside air processing method by the outside air processing unit 1 will be described. As an example of the outside air treatment method, cooling operation is performed using 20 ° C. heat source water, and the outside air is adjusted to a dry bulb temperature of 19 ° C. and a wet bulb temperature of 14.5 ° C. An example of supplying air will be described.

  First, when starting the operation of the outside air processing unit 1, the adjustment temperature (dry bulb temperature) of the supply air by the outside air processing unit 1 is set to 19 ° C., and the refrigerant heat exchanger pump 51 is activated to connect the branch pipe 50. Heat source water is supplied to the water-to-refrigerant heat exchanger 21 for heat pump. At the same time, the compressor 20 is started and the heat pump circuit unit A is started.

  When the heat pump circuit unit A reaches a predetermined load, the blower 10 is then started, the heat source water three-way valve 41 is switched to the heat source water pipe 40 side, and the air supply operation by the outside air processing unit 1 is started. When the blower 10 is activated, the fan coil 30 exchanges heat with the heat source water and heats the outside air precooled. At this time, the temperature of the heat source water in the heat source water pipe 40 on the outlet side of the fan coil 30 is raised to, for example, 23 ° C. Next, the air on the outlet side of the fan coil 30 is cooled and dehumidified by performing heat exchange with the refrigerant in the refrigerant-to-air heat exchanger 23. At this time, the load on the compressor 20 is controlled by the control unit C so that the air on the outlet side of the refrigerant-to-air heat exchanger 23 has a dry bulb temperature of 12.0 ° C. and a wet bulb temperature of 11.9 ° C., for example. Be controlled.

  Thereafter, the air on the outlet side of the refrigerant-to-air heat exchanger 23 is reheated by the reheat air heat exchanger 31 with the heat source water that has passed through the fan coil 30, that is, the heat source water that has risen in temperature to 23 ° C. At this time, the flow rate of the heat source water passed through the reheat air heat exchanger 31, in other words, the discharge flow rate of the heat source water pump 32 is the supply air temperature sensor 61 on the outlet side of the reheat air heat exchanger 31. For example, the control unit C controls so that the dry bulb temperature is 19 ° C. and the wet bulb temperature is 14.5 ° C., for example. The temperature of the heat source water passed through the reheat air heat exchanger 31 at 23 ° C. in the heat source water pipe 40 on the outlet side of the reheat air heat exchanger 31 is the reheat air heat exchanger 31. For example, the temperature is lowered to 21.1 ° C. due to heat exchange. That is, the temperature rise of the heat source water due to heat exchange in the heat exchange part B of the outside air processing unit 1 is 1.1 ° C. Note that, for example, when the ambient temperature becomes equal to or lower than the temperature of the heat source water during the cooling operation of the outside air processing unit 1, the heat source water three-way valve 41 is switched to the bypass pipe 42 side, and the fan coil 30 and the reheating air heat exchanger are switched. To bypass. And the air adjusted to predetermined temperature in the heat exchange part B is supplied with the air blower 10, and the cooling operation by the external air processing unit 1 is performed.

  According to the above embodiment, the fan coil 30 that exchanges heat with the heat source water and the water-to-refrigerant heat exchanger 21 for heat pump that exchanges heat between the heat source water and the refrigerant in the refrigerant pipe 24. On the other hand, since the heat source water is supplied in parallel by the heat source water pipe 40 and the branch pipe 50, for example, even when heat source water using underground heat at around 20 ° C. is used, the heat pump circuit section A Water at around 20 ° C. can be supplied as the heat source water used for heat exchange at. Therefore, compared with the case where the heat source water after heat exchange is used by the fan coil 30, the heat pump circuit unit A can be operated at a high efficiency point. As a result, high efficiency of the outside air processing unit 1 can be achieved.

  Further, since the fan coil 30 and the reheating air heat exchanger 31 are connected in series to the heat source water pipe 40, the reheating air heat exchanger 31 is heated by heat exchange with the fan coil 30. Warm heat source water can be used. For example, in the conventional outside air processing unit, the refrigerant at the outlet of the compressor 20 is used for reheating the reheating air heat exchanger 31, but according to the present embodiment, the heat source flowing through the heat source water pipe 40 is used. Since reheating can be performed with water, the heat pump circuit unit A can be operated with higher efficiency.

  Moreover, the temperature of the heat source water can be lowered by using the heat source water whose temperature has been raised by heat exchange with the fan coil 30 for reheating the reheat air heat exchanger 31. That is, the heat source water itself simultaneously performs heat absorption due to pre-cooling in the fan coil 30 and exhaust heat due to re-heating in the reheating air heat exchanger 31, so in the present embodiment, for example, in the heat exchanging part B The temperature rise can be suppressed to about 1.1 ° C. Therefore, it is possible to continuously use the heat source water due to the underground heat at a stable temperature without imposing a load on the underground heat.

  In the above embodiment, the flow rate of the heat source water to the fan coil 30 is controlled by the heat source water pump 32 with variable flow rate, but instead of the heat source water pump 32 with variable flow rate, for example, the flow rate is set at the outlet side of the constant flow pump. A control valve may be provided, and can be arbitrarily set as long as it has a mechanism capable of controlling the flow rate of the heat source water flowing through the heat source water pipe 40. Further, in place of the heat source water three-way valve 41, for example, a proportional three-way valve that controls the amount of heat source water passing through the bypass pipe 42 and a constant flow pump are combined to control the amount of heat source water flowing to the fan coil 30. May be. From the viewpoint of suppressing energy consumption (power consumption) in the entire outside air processing unit 1, the heat source water pump 32 is loaded even when the flow rate control valve causing the throttle loss and the amount of water flow to the fan coil 30 may be reduced. It is more preferable to use the heat source water pump 32 having a variable flow rate than to use a proportional three-way valve that operates at a constant level.

  Further, in supplying heat source water to the heat pump water-to-refrigerant heat exchanger 21, it is not always necessary to provide the refrigerant heat exchanger pump 51. For example, as shown in FIG. The flow rate adjustment valve 70 may be provided in the branch pipe 50 so that the flow rate of the heat source water supplied to the heat pump water-to-refrigerant heat exchanger 21 may be adjusted to be constant.

  In the above embodiment, the fan coil 30 and the reheating air heat exchanger 31 are connected in series to the heat source water pipe 40. However, the fan coil 30 and the reheating air heat exchanger 31 are connected. However, the fan coil 30 and the reheating air heat exchanger 31 may be provided in parallel to the heat source water pipe 40 as shown in FIG. In such a case, even if the shutoff valve 80 is provided between the heat source water pump 32 and the fan coil 30 in the heat source water pipe 40 and the shutoff valve 80 is opened and closed, the presence or absence of water flow to the fan coil 30 is controlled. Good. Further, a flow rate control valve 81 is provided between the heat source water pump 32 and the reheating air heat exchanger 31 in the heat source water piping 40, and the flow rate adjusting valve 81 allows the flow to the reheating air heat exchanger 31. By controlling the amount of water, control is performed so that, for example, the dry bulb temperature is 19 ° C. and the wet bulb temperature is 14.5 ° C. on the outlet side of the reheating air heat exchanger 31. As shown in FIG. 3, the branch pipe 50 is branched from between the heat source water pump 32 and the shutoff valve 80, and the branch pipe 50 is not particularly provided with a mechanism for adjusting the flow rate of the heat source water, and the heat source water pump 32. Therefore, the flow rate of water to the branch pipe 50 may be controlled to be constant, or the branch pipe 50 is provided upstream of the heat source water pump 32 and branched by the refrigerant heat exchanger pump 51 as shown in FIG. Water may be passed through the pipe.

  In the outside air processing unit 1 shown in FIG. 3, for example, when the air temperature becomes equal to or lower than the temperature of the heat source water during the cooling operation of the outside air processing unit 1, the shut-off valve 80 is closed and the heat source water to the fan coil 30 is closed. While the supply is stopped, the flow rate control valve 81 supplies the reheating air heat exchanger 31 to the reheating air heat exchanger 31 so that the supply air temperature becomes a desired temperature in the supply air temperature sensor 61 on the outlet side of the reheating air heat exchanger 31. Except that the amount of water flow is controlled, the same outside air treatment as that of the outside air treatment unit 1 shown in FIG. 1 is performed.

  In the above embodiment, the case where the cooling operation is performed has been described, but the heating operation may be performed by the outside air processing unit 1. For example, when the outside air processing unit 1 shown in FIG. 3 is used as the heating operation, the refrigerant supply destination at the outlet of the compressor 20 is changed to the heat pump circuit unit A shown in FIG. A four-way valve 90 that switches to either the heat-pump water-to-refrigerant heat exchanger 21 or the refrigerant-to-air heat exchanger 23 is provided on the outlet side of the compressor 20 in the refrigerant pipe 24, and the heat-pump water-to-refrigerant heat in the refrigerant pipe 24. This can be realized by providing another expansion valve 22 a between the exchanger and the refrigerant-to-refrigerant heat exchanger 26.

  When the four-way valve 90 is in the state of a solid line as shown in FIG. 4, that is, when the refrigerant supply destination at the outlet of the compressor 20 is the water-to-refrigerant heat exchanger 21 for the heat pump, the outdoor air processing unit 1 shown in FIG. Since the system configuration is the same, the same cooling operation as in FIG. 3 is performed. When heating operation is performed, the four-way valve 90 is switched to a state indicated by a broken line in FIG. 4, that is, the refrigerant supply destination at the outlet of the compressor 20 is changed to the refrigerant-to-air heat exchanger 23.

  This heating operation will be described by taking, for example, a case where the temperature of the heat source water is 15 ° C. and the outside air is, for example, a dry bulb temperature of 0 ° C. and a wet bulb temperature of −3 ° C.

  In the heating operation, the shut-off valve 80 is opened and the fan coil 30 heats the outside air with the heat source water. The air preheated by the fan coil 30 is then heated by the high-temperature and high-pressure refrigerant flowing through the refrigerant pipe 24 in the refrigerant-to-air heat exchanger 23. Then, the flow rate control valve 81 is closed so that the heat exchange in the reheating air heat exchanger 31 is not performed. Thereby, the heating operation by a desired supply air temperature is performed. If the outside air becomes equal to or higher than the temperature of the heat source water during the heating operation, the shutoff valve 80 may also be closed. During the heating operation, the expansion valve 22 is opened, and the refrigerant is decompressed by the other expansion valve 22a. The refrigerant decompressed by the other expansion valve 22a evaporates by exchanging heat with the heat source water in the water-to-refrigerant heat exchanger for heat pump, is sent to the accumulator 25, passes through the refrigerant-to-refrigerant heat exchanger 26, and again passes through the compressor 20 Return to.

  For example, when only the heating operation is performed by the outside air processing unit 1 shown in FIG. 4, the four-way valve 90 is not necessary. For example, the system shown by the broken line of the four-way valve 90 in FIG. Only a system for supplying the refrigerant to the refrigerant-to-air heat exchanger 23 is sufficient. Also, for example, in the outside air processing unit 1 shown in FIGS. 1 and 2, similarly to the outside air processing unit 1 shown in FIG. 4, the refrigerant supply destination at the outlet of the compressor 20 is the water-to-refrigerant heat exchanger 21 for the heat pump or the refrigerant. By providing the heat pump circuit section A with the four-way valve 90 that switches to any one of the air heat exchangers 23, both the cooling operation and the heating operation can be performed. Naturally, also in the outside air processing unit 1 shown in FIGS. 1 and 2, when only the heating operation is performed, the high-temperature and high-pressure refrigerant at the outlet of the compressor 20 is not supplied to the refrigerant-to-refrigerant heat exchanger 26. It suffices to construct only a system for supplying air to the refrigerant-to-air heat exchanger 23 to heat the air.

  In the above embodiment, an example of the configuration of the outside air processing unit 1 has been described. However, those skilled in the art have conceived various changes or modifications to the outside air processing unit 1 configuration according to this embodiment. Obviously, it is obvious that these are also within the technical scope of the present invention.

  The present invention is useful when the outside air is cooled or heated by the outside air processing unit.

DESCRIPTION OF SYMBOLS 1 Outside air processing unit 10 Blower 20 Compressor 21 Water-to-refrigerant heat exchanger for heat pump 22 Expansion valve 22a Other expansion valve 23 Refrigerant-to-air heat exchanger 24 Refrigerant piping 25 Accumulator 26 Refrigerant-to-refrigerant heat exchanger 30 Fan coil 31 Reheat Air heat exchanger 32 Heat source water pump 40 Heat source water piping 41 Heat source water three-way valve 41
42 Bypass pipe 50 Branch pipe 51 Refrigerant heat exchanger pump 52 Heat source water temperature sensor 60 Outside air temperature sensor 61 Supply air temperature sensor 80 Shut-off valve 81 Flow control valve 90 Four-way valve A Heat pump circuit part B Heat exchange part C Control part

Claims (1)

An outside air processing unit with a heat pump that performs outside air processing using heat source water,
It is installed in the heat source water pipe that passes the heat source water from the ground and returns the passed heat source water to the ground, and exchanges heat between the air sucked into the blower and the heat source water in the heat source water pipe A fan coil,
Heat is provided between heat source water in the other heat source water pipe branched from the upstream side of the fan coil in the heat source water pipe and the refrigerant in the refrigerant pipe connected to the compressor. A water-to-refrigerant heat exchanger for the heat pump that performs the exchange;
A refrigerant-to-air heat exchanger that is provided on the downstream side of the fan from the fan coil and performs heat exchange between the air sucked into the fan and the refrigerant in the refrigerant pipe;
An air heat exchanger for reheating, which is provided on the downstream side of the blower from the refrigerant-to-air heat exchanger and reheats the air sucked into the blower,
The reheated air heat exchanger, Ri Contact is connected in series with the heat source water pipe of the fan coil downstream,
The passing water of the heat source water to the reheating air heat exchanger, said controlled by fan coil upstream of the flow rate variable heat source water pump provided in the heat source water pipe, characterized in Rukoto, ambient air with a heat pump Processing unit.

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