JP4199643B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner capable of freely setting a cooling / heating operation and a dehumidifying operation by adding a heat pump refrigeration cycle to a fan coil function for cooling or heating by supplying cold water or hot water from a heat storage source, for example. .

For example, [Patent Document 1] discloses a technique in which a heat pump type refrigeration cycle is added to a fan coil function for cooling or heating by supplying cold water or hot water from a heat storage source.
In particular, as shown in FIG. 4 of [Patent Document 1], a fan coil (water-to-air heat exchanger) for leading heat source water and a refrigeration cycle room in an air passage (duct) for guiding room air. An air heat exchanger (refrigerant to air heat exchanger) corresponding to the heat exchanger is arranged. The refrigeration cycle includes a water-to-refrigerant heat exchanger corresponding to an outdoor heat exchanger, in addition to a compressor, a four-way valve, a pressure reducing device, and the air heat exchanger. And the circuit provided with the three-way valve which switches and guides the heat source water guide | induced from a heat storage source to a fan coil or a water-to-refrigerant heat exchanger, or both.

In normal air conditioning, the refrigeration cycle is stopped and the three-way valve is switched to guide the heat source water to the fan coil to exchange heat with room air. If the three-way valve is switched to drive the refrigeration cycle to circulate the heat source water to the water-to-refrigerant heat exchanger, a heat pump cycle using the heat source water as a heat source is obtained, and cold air or hot air can be obtained in the air heat exchanger. At this time, the heat source water is not led to the fan coil, so there is no heat exchange effect here.
In the cooling / heating operation by the refrigeration cycle, when further improvement in the cooling / heating capacity is required, the three-way valve is controlled so that the heat source water flows simultaneously to both the fan coil and the water-to-refrigerant heat exchanger. A fan coil and an air heat exchanger are used together, and it can cope with a larger heat load.
Japanese Examined Patent Publication No. 6-68392

However, the above has the following drawbacks.
When hot water having a high temperature is supplied from a heat storage source, cooling operation in a refrigeration cycle may be selected. At this time, the three-way valve is switched in accordance with the operation of the refrigeration cycle, and the hot water having a high temperature is directly guided to the water-to-refrigerant heat exchanger serving as the condenser of the refrigeration cycle and dissipates heat. Therefore, the increase in the high pressure of the refrigeration cycle becomes significant, resulting in a decrease in cycle efficiency.

  On the other hand, when cold water having a low temperature is guided from the heat storage source, the heating operation in the refrigeration cycle may be selected. Also at this time, the three-way valve is switched in accordance with the operation of the refrigeration cycle, and cold water having a low temperature is directly guided to the water-to-refrigerant heat exchanger serving as an evaporator of the refrigeration cycle and absorbs heat. Therefore, the low pressure drop of the refrigeration cycle becomes remarkable, resulting in a decrease in cycle efficiency.

  In the cooling / heating by the fan coil function, capacity control can be performed only by turning on / off the fan or heat source water, and therefore, the temperature fluctuation in the room increases and the comfort is impaired. If the state where water does not pass through the fan coil continues for a long time by switching the three-way valve, the heat source water stays in the fan coil, and internal corrosion or alteration of cold / hot water tends to occur. In addition, if necessary, isothermal dehumidification in which there is no change in room temperature may be required, but the above-described technology cannot satisfy the demand.

  The present invention has been made paying attention to the above-mentioned problems, and the purpose of the present invention is to change the capacity on the premise that a heat pump type refrigeration cycle is added to the fan coil function, and to perform cooling / heating operation and dehumidification operation. An object of the present invention is to provide an air conditioner that can be freely selected.

  The present invention has been made in order to satisfy the above-described object, and a fan coil having a heat source water conduction path and an air heat exchanger having a refrigerant conduction path are arranged in a room air ventilation path, and a heat pump. Compressor, four-way valve, air heat exchanger, pressure reducing device, water / refrigerant heat exchanger with heat source water and refrigerant conduction path are sequentially communicated through the refrigerant pipe as a water refrigeration cycle, and from the heat source as water circulation means The heat source water is led to a water / water heat exchanger having a pair of heat source water passages, further led to a fan coil, then led again to the water / water heat exchanger, and then returned to the heat source via the water / refrigerant heat exchanger. A first flow path and a second flow path for directly leading the heat source water derived from the fan coil to the water / refrigerant heat exchanger without passing through the water / water heat exchanger in the first flow path. The flow path control means supplies the heat source water to the first flow path and the second flow path. And changeover control, operation control means for controlling the refrigeration cycle and the flow path control means.

  According to the present invention, on the premise that a heat pump type refrigeration cycle is added to the fan coil function, it is possible to change the capacity, and there is an effect that an air conditioning operation and a dehumidifying operation can be freely selected.

[Example 1]
Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically illustrating a configuration of an air conditioner.
In the figure, reference numeral 1 denotes a ventilation path (duct) communicating with the air-conditioned room. On the windward side in the ventilation path 1, a heat source water conduction path is provided, and heat source water and indoor air guided to the ventilation path 1 are provided. A fan coil 2 capable of heat exchange is arranged. An air heat exchanger 3 corresponding to the indoor heat exchanger of the refrigeration cycle R is disposed on the downwind side of the fan coil 2 in the ventilation path 1 so that heat can be exchanged between the refrigerant and the indoor air guided to the ventilation path 1. Further, a blower 4 for blowing air in the air-conditioned room is installed on the leeward side of the fan coil 2 and the air heat exchanger 3.

  On the other hand, a main unit M is disposed in a predetermined part inside or outside the ventilation path 1, and the main unit M constitutes a refrigeration cycle R. The compressor 13, the four-way valve 12, an electronic expansion valve (pressure reduction device). 11 is arranged except for the air heat exchanger 3 such as a water / refrigerant heat exchanger 9 described later corresponding to an outdoor heat exchanger, and these components communicate with each other through a refrigerant pipe P. The electronic expansion valve 11 is disposed between the water / refrigerant heat exchanger 9 and the air heat exchanger 3, and controls the degree of superheat of the refrigerant by providing an appropriate throttle. The water / refrigerant heat exchanger 9 includes a conduction path that guides the refrigerant and a conduction path that leads the heat source water, and can exchange heat between the refrigerant and the heat source water.

Further, the main unit M includes a heat source water inlet portion 5 that guides cold water or hot water that is heat source water from a heat storage source (not shown), and a heat source water outlet portion 10 that returns the heat source water to the heat storage source. The heat source water inlet portion 5 and the heat source water outlet portion 10 constitute an inlet portion and an outlet portion of a heat source water circulation circuit (water circulation means) N accommodated in the main unit M.
As the heat source water circulation circuit N, heat source water led from the heat storage source to the heat source water inlet 5 is led to the fan coil 2 through a water / water heat exchanger 6 described later, and the heat source water led out from the fan coil 2 Is guided again to the water / water heat exchanger 6 based on the switching operation of the three-way valve (flow path control means) 7 and further led to the water / refrigerant heat exchanger 9 and then stored in the heat source water outlet 10. A first flow path A returning to the source is provided.

The heat source water circulation circuit N directly connects the water / refrigerant heat exchanger 9 without passing the heat source water derived from the fan coil 2 through the water / water heat exchanger 6 based on the switching operation of the three-way valve 7. The second flow path B leading to is provided.
The water / water heat exchanger 6 is provided with two heat source water conducting paths intersecting each other. A heat source water conduction path communicating with the heat source water inlet section 5 and the fan coil 2, and a heat source water conduction path communicating with the three-way valve 7 and the water / refrigerant heat exchanger 9 introduction side. While being led, each other's heat source water is heat-exchanged.

Further, the air conditioner includes a remote control panel (remote control) for giving an instruction of an operation mode, an air volume, and a set temperature to the user, and the blower 4, the compressor 13, the electronic expansion valve based on the instructions on the remote control panel. The control part (operation control means) 15 for controlling 11 and the three-way valve 7 etc. and implementing optimal driving | operation is provided.
The electronic expansion valve 12 can be replaced with a capillary tube having a fixed throttle. Although only the fan coil 2, the air heat exchanger 3 and the blower 4 are shown in the ventilation path 1 in the drawing, other components may be housed in the ventilation path 1 in a state in which a ventilation path is secured. Furthermore, the compressor 13 may be capable of changing the ability to change the rotational speed.

Next, the operation in each operation mode of the air conditioner configured as described above will be described. The operation mode is determined by the operation mode instruction to the user's remote control, the set temperature, the current temperature of the air-conditioned space, and the water temperature at the heat source water inlet 5. [Table 1] below shows each operation mode and control conditions corresponding to each operation mode.

The contents of Table 1 will be specifically described below.
(1) Normal cooling operation and normal heating operation
When the required cooling / heating capacity is not so large and cold water of less than 25 ° C. is supplied during cooling, and hot water of 25 ° C. or more is supplied during heating, the controller 15 instructs the stop of the compressor 13 to generate air heat. The exchanger 3 does not perform heat exchange, and only the fan coil 2 functions.

  At this time, the control unit 15 switches the three-way valve 7 to circulate the heat source water in the second flow path B, and performs control so that the heat source water does not flow in the first flow path A. The heat source water of the heat storage source is led from the heat source water inlet 5 to the fan coil 2 through the water / water heat exchanger 6. The heat source water led out from the fan coil 2 is led from the three-way valve 7 to the water / refrigerant heat exchanger 9, and is further discharged from the heat source water outlet 10 and returned to the heat storage source.

  In this operation mode, in the water / water heat exchanger 6, the heat source water is guided only to the heat source water conduction path communicating with the heat source water inlet 5 and the fan coil 2, and the three-way valve 7 and the water / refrigerant heat exchanger 9 The heat source water is not guided to the heat source water conducting path communicating with the heat source water introduction side. Therefore, heat exchange between the heat source waters is not performed in the water / water heat exchanger 6, and since the refrigeration cycle operation is stopped, the water / refrigerant heat exchanger 9 also has no heat exchange action in the state where there is no heat exchange action. Led.

  Eventually, the fan coil 2 only exchanges heat with the indoor air guided to the ventilation path 1, and if cold water is guided to the heat source water circulation circuit N, the indoor cooling operation is performed, and hot water is guided to the heat source water circulation circuit N. If so, it will heat the room. At this time, the capacity adjustment performed by the difference between the set temperature for the remote controller and the current room temperature can satisfy the demand for large capacity by increasing the air flow rate of the blower 4, and the capacity adjustment by reducing the air flow rate of the blower 4. Satisfy small requirements.

(2) High capacity cooling operation and high capacity heating operation
(1) If the difference between the set temperature and the current room temperature becomes large and the fan coil function alone becomes insufficient while the normal cooling / heating operation conditions are continued, the refrigeration cycle operation is performed to increase the capacity. Capability air conditioning operation.
At this time, there is no change in the switching direction of the three-way valve 7 in the heat source water circulation circuit N, which is the same as the normal air conditioning operation described above, but the control unit 15 starts driving the compressor 13 constituting the refrigeration cycle R. At the same time, the switching control of the four-way valve 12 is performed.

  For example, when there is an instruction for high-capacity cooling operation during the supply of cold water, the cold water led from the heat storage source to the heat source water inlet 5 is conducted only in one heat source water passage of the water / water heat exchanger 6 and the other heat source water. Since it is not guided to the conduction path, the cold water is guided to the fan coil 2 by the water / water heat exchanger 6 without increasing its temperature, and absorbs heat from the indoor air in the ventilation path 1. That is, the fan coil 2 emits cold heat into the room air, the temperature of the room air is reduced to cold air, and is led to the air heat exchanger 3 disposed on the leeward side of the fan coil 2.

At the same time, the refrigeration cycle operation is performed, the refrigerant condenses in the water / refrigerant heat exchanger 9, the refrigerant evaporates in the air heat exchanger 3, and the latent heat of evaporation is taken away from the cold air that has passed through the fan coil 2. The cool air is changed to cool air whose temperature has further decreased, and is blown into the room. Therefore, high capacity cooling is obtained.
The cold water that has finished absorbing heat by the fan coil 2 is guided from the three-way valve 7 to the water / refrigerant heat exchanger 9 via the second flow path B. In this water / refrigerant heat exchanger 9, since the refrigerant condenses, cold water exchanges heat with the refrigerant and absorbs the heat of condensation. The water / refrigerant heat exchanger 9 is used as a water heat exchanger, and the heat absorption here is used as the cooling heat amount in the refrigeration cycle R, and the cooling temperature is high in efficiency by taking a difference in use temperature compared to the fan coil function alone. It becomes.

When there is an instruction for high-capacity heating operation during the supply of hot water, the hot water led from the heat storage source to the heat source water inlet 5 is led to the fan coil 2 by the water / water heat exchanger 6 without lowering the temperature, and the room air To dissipate heat. As the fan coil 2 releases warm heat into the room air, the room air rises in temperature and changes to warm air, and is led to the air heat exchanger 3.
Simultaneously, the refrigeration cycle operation is performed, the refrigerant evaporates in the water / refrigerant heat exchanger 9, the refrigerant condenses in the air heat exchanger 3, and the condensed heat is released to the warm air led from the fan coil 2. The warm air changes into warm air whose temperature has further increased, and is blown into the room. Therefore, high capacity heating is obtained.

  Note that the hot water that has radiated heat by the fan coil 2 is guided from the three-way valve 7 to the water / refrigerant heat exchanger 9 via the second flow path B. The refrigerant is evaporated in the water / refrigerant heat exchanger 9 and releases latent heat of evaporation. That is, the hot water whose temperature has been reduced by the fan coil 2 is further deprived of heat by the water / refrigerant heat exchanger 9, and the heat dissipation here is used as the amount of heating heat through the refrigeration cycle. The temperature difference can be taken and heating is efficient.

  In this way, even if cooling is performed by the fan coil 2 using cold water having a detected water temperature of less than 25 ° C., if the difference between the set temperature and the current room temperature is large and there is a demand for cooling with high capacity, the refrigeration cycle The requirement can be satisfied by performing the cooling by R and the cooling by the fan coil 2 at the same time. Furthermore, even if the detected water temperature is 25 ° C. or higher and the fan coil 2 is used for heating, if the difference between the set temperature and the current room temperature is large and there is a demand for heating with high capacity, heating by the refrigeration cycle R And the heating by the fan coil 2 can be performed simultaneously to satisfy the requirements.

(3) Cooling operation when supplying hot water (reverse cooling) and heating operation when supplying cold water (reverse heating)
Hot water of 25 ° C. or higher is supplied from the heat storage source, but there is a demand for emphasizing the cooling operation for some reason in the air-conditioned room. Moreover, although cold water below 25 degreeC is supplied from the heat storage source, there exists a request | requirement which wants to emphasize heating operation by a certain situation in an air-conditioned room.

  That is, cooling and heating by the fan coil function are determined by the user's instruction, but when the cooling operation is requested during the supply of hot water, the hot water cannot be cooled by directing it to the fan coil 2 as it is. When the heating operation is requested during supply of the water, the cooling cannot be performed by guiding the cold water to the fan coil 2 as it is. Therefore, the control unit 15 switches the conduction direction of the heat source water from the second flow path B to the first flow path A with respect to the three-way valve 7 and then starts the refrigeration cycle operation.

  If there is an instruction for cooling operation during the supply of hot water, the hot water led from the heat storage source to the heat source water inlet 5 is conducted through one heat source water conduction path of the water / water heat exchanger 6 and then led to the fan coil 2. In the fan coil 2, the hot water exchanges heat with room air to lower the temperature, and then the other heat source water conduction path of the water / water heat exchanger 6 that is the first flow path A according to the switching direction of the three-way valve 7. To exchange heat with the hot water that has passed through the heat source water inlet 5.

Eventually, the hot water, which was high in temperature (45 to 50 ° C.) at the heat source water inlet portion 5, is reduced in temperature (approximately 30 ° C.) by heat exchange in the water / water heat exchanger 6, and then introduced into the fan coil 2. It is burned. The hot water exchanges heat with the low-temperature indoor air and falls to a temperature close to the air temperature (about 25 ° C.), and further exchanges heat with the hot water led from the heat source water inlet 5 and the water / water heat exchanger 6.
The heating capacity in the fan coil 2 is invalidated, while the operation for the refrigeration cycle R is started. In the water / refrigerant heat exchanger 9, the hot water and the refrigerant that have been cooled to lower the temperature exchange heat, and the refrigerant is condensed and guided to the air heat exchanger 3, where a cooling operation is performed to evaporate. The air heat exchanger 3 obtains a so-called “reverse cooling” action in which the latent heat of vaporization is removed from the air that has passed through the fan coil 2 and converted into cold air.

  In this way, since the hot water is guided to the two heat source water passages in the water / water heat exchanger 6 to exchange heat with each other, the amount of heat that the hot water guided to the fan coil 2 exchanges with the indoor air is determined by the hot water. Compared with the case of directly flowing into the fan coil 2, it becomes very small. By passing through the water / water heat exchanger 6, it is possible to lower the temperature of the hot water and to reduce the amount of heat dissipated in the fan coil 2. On the other hand, since the air heat exchanger 3 acts as a heat absorber that evaporates the refrigerant, the air that has not yet been heat-exchanged after passing through the fan coil 2 is reliably and sufficiently cooled.

  Similarly, when there is an instruction for heating operation during the supply of cold water, the cold water led from the heat storage source to the heat source water inlet 5 is conducted through one heat source water passage of the water / water heat exchanger 6 and then the fan coil 2. Led to. In the fan coil 2, the cold water exchanges heat with air and rises in temperature, and then enters the other heat source water conduction path of the water / water heat exchanger 6 as the first flow path A according to the switching direction of the three-way valve 7. It is guided and exchanges heat with cold water that has passed through the heat source water inlet 5.

Eventually, the cold water, which has been at a low temperature (about 10 ° C.) at the heat source water inlet portion 5, is led to the fan coil 2 after the temperature rises (about 20 ° C.) by exchanging heat with the water / water heat exchanger 6. The cold water exchanges heat with room air and rises to a temperature close to the air temperature (about 25 ° C.), and further heat exchanges with the low-temperature cold water guided from the heat source water inlet 4 and the water / water heat exchanger 6.
The cooling capacity of the fan coil 2 is invalidated, while the operation for the refrigeration cycle R is started. The water / refrigerant heat exchanger 9 exchanges heat between the cold water that has been warmed and the temperature has increased, and the refrigerant evaporates and is led to the air heat exchanger 3 where the cooling operation is performed. In the air heat exchanger 3, a so-called “reverse heating” effect is obtained, in which condensation heat is applied to the air after flowing through the fan coil 2 to change it into warm air.

  In this way, cold water is guided to the two heat source water conducting paths in the water / water heat exchanger 6 to exchange heat with each other. Therefore, the amount of heat exchanged between the cold water guided to the fan coil 2 and the indoor air is determined by cold water. Compared with the case of directly flowing into the fan coil 2, it becomes very small. By passing through the water / water heat exchanger 6, the temperature of the low-temperature cold water is increased, and the amount of heat absorbed by the fan coil 2 can be reduced. On the other hand, since the air heat exchanger 3 acts as a radiator that condenses the refrigerant, the air that has not yet been subjected to heat exchange after passing through the fan coil 2 is reliably and sufficiently warmed.

  In both the reverse cooling and the reverse heating, the heat source water that leaves the fan coil 2 and flows into the water / water heat exchanger 9 is heated (cooled) to a temperature almost close to room temperature. Thereafter, the water / refrigerant heat exchanger 9 is led to exchange heat with the refrigerant of the refrigeration cycle. Therefore, compared with the conventional control in which cold / hot water is directly introduced into the water / refrigerant heat exchanger 9, the high pressure side is lowered during cooling to achieve high efficiency and prevention of high pressure danger, and the low pressure side is restricted during heating. Higher for higher efficiency and freeze protection.

(4) Dehumidifying operation
There is a case where a dehumidifying operation for reducing the humidity is instructed without changing the room temperature. At this time, the control unit 15 sets the three-way valve 7 on the second flow path B side as in the normal air conditioning described above, regardless of the temperature of the cold water and the hot water that are the heat source water supplied to the heat source water circulation circuit N. Switch to. The heat source water is supplied from the heat source water inlet portion 5 through the water / water heat exchanger 6, the fan coil 2, the three-way valve 7, and the water / refrigerant heat exchanger 9 constituting the second flow path B. Sequentially led to.

On the other hand, the control unit 15 varies the control for the refrigeration cycle R according to the heat source water temperature at the heat source water inlet 5. For example, if the heat source water is warm water of 25 ° C. or higher, a cooling cycle is performed, and if the heat source water is cold water of 25 ° C. or lower, the four-way valve 12 is switched and controlled to perform a heating cycle.
When hot water having a temperature higher than 25 ° C. is led to the fan coil 2, the heat is radiated into the room air to temporarily raise the temperature of the room air, but the cooling cycle is selected for the refrigeration cycle R. The room air led to the heat exchanger 3 is cooled. Therefore, the air heat exchanger 3 changes the room air that has passed through the fan coil 2 to a dew point temperature or less to induce condensation. Heating in the fan coil 2 and cooling in the air heat exchanger 3 operate mutually, and dehumidification can be performed without changing the temperature of room air (isothermal) on the outlet side of the ventilation path 1.

  When cold water having a temperature lower than 25 ° C. is led to the fan coil 2, it absorbs heat from the room air and temporarily lowers the temperature of the room air. However, since the heating cycle is selected for the refrigeration cycle R, the air heat The room air led to the exchanger 3 is heated. Therefore, the air heat exchanger 3 changes the room air that has passed through the fan coil 2 to a dew point temperature or less to induce condensation. The cooling in the fan coil 2 and the heating in the air heat exchanger 3 operate mutually, and dehumidification can be performed without changing the temperature of the air temperature (isothermal) on the outlet side of the ventilation path 1.

  Thus, according to this invention, while adding the air heat exchanger 3 which is a heat exchanger for the air cooling heating in the refrigerating cycle R with respect to the fan coil function which exhibits air conditioning capability according to the temperature of heat source water. A water / water heat exchanger 6 is provided. Then, the heat capacity of the fan coil 2 can be selectively reduced by selectively exchanging heat of the heat source water with the derived heat source water of the fan coil 2 close to the air temperature.

  Not only the fan coil function but also the refrigeration cycle cooling operation at the time of cold water supply and the refrigeration cycle heating operation at the time of hot water supply enable a large-capacity operation that adds the capabilities of the fan coil 2 and the refrigeration cycle R. And in the heating at the time of cold water supply (reverse heating), the cold water guide | induced to the fan coil 2 can be heated in advance, and it can heat by the refrigerating cycle R, reducing the performance of the fan coil 2. FIG. On the heat absorption side (water / refrigerant heat exchanger 9) of the refrigeration cycle R, efficient operation can be performed by re-absorbing heat from the room.

In cooling at the time of supplying hot water (reverse cooling), the hot water guided to the fan coil 2 is cooled in advance, so that the cooling of the fan coil 2 can be reduced and the cooling can be performed by the refrigeration cycle R. On the heat absorption side (water / refrigerant heat exchanger 9) of the refrigeration cycle R, efficient operation can be performed by re-radiating heat from the room.
Furthermore, by freely combining the amount of heat obtained by the fan coil 2 and the operation for the refrigeration cycle R, an operation such as isothermal dehumidification can be freely set.
In this embodiment, the fan coil 2 is provided on the windward side, but there is an isothermal dehumidification requirement under conditions where hot water (or water at around 20 ° C.) is often used due to the characteristics of the air-conditioned space. In this case, other air conditioning performance is sacrificed to some extent, but it is possible to make changes such as increasing the dehumidifying effect by installing the air heat exchanger 3 on the windward side.

Further, although the three-way valve 7 is provided as a flow path control means for the first flow path A and the second flow path B, the present invention is not limited to this, and the first flow path A and the second flow path are provided. Each B may be provided with a two-way valve, and the opening and closing operations may be reversed.
Alternatively, a capillary tube (resistance means) having a high flow resistance may be installed in the first flow path A, and a two-way valve may be installed in the second flow path B. In this case, when it is desired to flow the heat source water through the second flow path B, the two-way valve is opened, and when the heat source water is flowed through the first flow path A, the two-way valve is closed. The water / water heat exchanger 6 can be changed so that the heat source water always flows in the water / water heat exchanger 6 to prevent the water / water heat exchanger 6 from being clogged with rust or the like.

In order to control the capacity of the compressor 13, not only can it be handled by changing the number of revolutions, but also a circulation amount variable mechanism (such as a pump or a flow rate adjustment valve) is provided at the inlet 5 or outlet 10 of the heat source water, The response | compatibility by controlling the flow volume of water may be sufficient. Further, the fan coil 2 and the air heat exchanger 3 may be arranged side by side.
The present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the scope of the present invention, and the present invention completely includes all of them. Is.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic structure and piping figure of the air conditioning apparatus which show the Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Ventilation path, 2 ... Fan coil, 3 ... Air heat exchanger, 13 ... Compressor, 12 ... Four-way valve, 11 ... Pressure-reducing device (electronic expansion valve), 9 ... Water / refrigerant heat exchanger, R ... Refrigeration cycle , 6 ... water / water heat exchanger, A ... first flow path, B ... second flow path, N ... heat source water circulation circuit (water circulation means), 7 ... three-way valve (flow path control means), 15 ... control Part (operation control means).

Claims (6)

An air heat exchanger provided with a fan coil provided with a conduction path for heat source water and a conduction path for refrigerant, arranged in a ventilation path for indoor air;
A heat pump type refrigeration cycle in which a water / refrigerant heat exchanger having a compressor, a four-way valve, the air heat exchanger, a pressure reducing device, a heat source water and a refrigerant passage is sequentially communicated via a refrigerant pipe;
The heat source water is led from the heat source to a water / water heat exchanger having a pair of heat source water conduction paths, further led to the fan coil, and then led again to the water / water heat exchanger, and further to the water / refrigerant heat. A first flow path that returns to the heat source via the exchanger, and heat source water derived from the fan coil in the first flow path directly without passing through the water / water heat exchanger; Water circulation means having a second flow path leading to the exchanger;
Flow path control means for switching and controlling the heat source water between the first flow path and the second flow path;
An air conditioner comprising: the refrigeration cycle; and an operation control means for controlling the flow path control means.   The flow path control means includes a three-way valve or a two-way valve provided in each of the first flow path and the second flow path, and the three-way valve or each two-way valve includes the first flow path and the second flow path. 2. The air conditioner according to claim 1, wherein the air conditioning apparatus is controlled to open and close so that the heat source water flows only in one of the flow paths.   The flow path control means includes a resistance means provided in the first flow path and a two-way valve provided in the second flow path, and the first flow path is always provided with heat source water via the resistance means. The air conditioner according to claim 1, wherein the air conditioner is controlled to flow. The flow path control means closes the second flow path when performing a heating operation by a refrigeration cycle when supplying cold water as a heat source water, and when performing a cooling operation by a refrigeration cycle when supplying hot water as a heat source water. The heat source water derived from the fan coil is guided to the first flow path,
The heat source water or the heat source water and a cooling / heating operation using the refrigeration cycle are controlled so that the first flow path is closed and the heat source water led out from the fan coil is guided to the second flow path. The air conditioning apparatus according to any one of claims 1 and 2.   The above operation control means switches the isothermal (heating) dehumidifying operation by guiding the cold water to the fan coil and performing the heating operation in the refrigeration cycle, or guiding the hot water to the fan coil and performing the cooling operation in the refrigeration cycle. The air conditioner according to any one of claims 1 to 4, wherein the air conditioner is made possible.   The air conditioner according to any one of claims 1 to 5, wherein the fan coil is disposed on the windward side of the air heat exchanger.

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