JP2012013358A - Heat pump type cold/warm water cooling/heating device - Google Patents

Abstract

A heat pump-type hot / cold water cooling / heating device that prevents condensation during cooling operation is provided.
A heat exchange unit B including a water-refrigerant heat exchanger 2 that exchanges heat with refrigerant and water of a heat pump cycle 39 that heats and cools the refrigerant to form high-temperature water or cold water, and a water-refrigerant heat exchanger 2 A circulation circuit 38 that circulates hot water, a heating terminal 23 that heats and cools the room, a cooling terminal 22, and a boiling pump that sends hot water in the heat exchange unit B to the heating terminal 23 and the cooling terminal 22 via the circulation circuit 38. 9, an exterior 37 that blocks outside air from the inside of the heat exchange unit B, a heat exchange exterior thermistor 28 that detects the surface temperature of the exterior 37, and a heater 29 that is provided in the heat exchange unit B and raises the internal ambient temperature. When the refrigerant cooled by the heat pump cycle 39 is sent to the heat exchange unit B and the cold water is sent to the cooling terminal 22 to cool the room, the temperature drops to the dew point and condensation occurs. , To prevent condensation of the exterior 37 by energizing the heater 29.
[Selection] Figure 1

Description

  The present invention relates to a heat pump type cold / hot water cooling / heating apparatus that performs cooling and heating with cold / hot water generated using a heat pump.

  Conventionally, the use of heating equipment that uses combustion fuels such as oil and gas as a heat source has occupied the majority, but in recent years, the heating market using heat pump technology has expanded rapidly. Also, some conventional air conditioners can use both cooling and heating by utilizing heat pump technology.

  However, the conventional air conditioner alone has a problem that the feet are difficult to warm during heating, and a hot water heater using heat pump technology has been developed to solve the problem (see, for example, Patent Document 1). In the hot water heating apparatus described in Patent Document 1, heat exchange is performed between a high-temperature refrigerant and hot water, and the hot water heated by heat exchange is sent to a heating terminal such as a floor heating panel to perform heating.

  FIG. 9 is a configuration diagram of a conventional heat pump hot water heater described in Patent Document 1.

  As shown in FIG. 9, the conventional heat pump type hot water heating apparatus has a compressor 101, a refrigerant flow path of a water / refrigerant heat exchanger 102, a decompression device 103, and an evaporator 104 that are sequentially annularly formed by a refrigerant pipe 105. The refrigeration cycle 106 was connected to form a boiling cycle by sequentially connecting the water flow path of the water-refrigerant heat exchanger 102, the boiling pump 109, and the hot water storage tank 110 in an annular manner.

  When the heating operation is started, the hot water circulation pump 111 is driven to send the hot water in the hot water storage tank 110 to the heating terminal 108. In addition, when performing a hot water supply operation, hot water is exchanged with hot water in the hot water storage tank 110 by a hot water supply heat exchanger 112 provided in the hot water storage tank 110, and hot water is supplied to a hot water supply terminal (not shown). The

  The above system is a system mainly using heating, and is a system mainly used in the Nordic region. However, as a feature of a system using a heat pump, there is a feature that not only heating but also cooling can be performed, and a system that can also perform cooling is desired for the whole of Europe.

  Therefore, the heat pump type cold / hot water cooling / heating apparatus shown in FIG. 10 is generally used as a system that can also perform cooling for the whole of Europe, and future demand is expected.

  FIG. 10 is a configuration diagram of a conventional heat pump type cold / hot water cooling / heating device.

  As shown in FIG. 10, a conventional heat pump type cold / hot water cooling / heating device includes a compressor 101, a refrigerant flow path of a water / refrigerant heat exchanger 102, a decompression device 103, and an evaporator 104, and a refrigerant pipe 105. The refrigeration cycle 106 is configured by being connected in a ring shape. However, a four-way valve 113 is further provided, and during cooling, the refrigerant from the compressor 101 is sent to the water refrigerant heat exchanger 102 and the water refrigerant heat exchanger 102 is supplied. The cold water in the water flow path (not shown) can be sent to the cooling terminal 115.

  When the circulating pump 116 is supplying cold water, the three-way valve 114 is switched to send it to the cooling terminal 115 without sending it to the hot water storage tank 117, and the two-way valve 118 is also provided on the route in the middle of the heating terminal 108. To prevent the heating terminal 108 from condensing. During heating, the two-way valve 118 in the middle of the heating terminal 108 is opened for heating, and the three-way valve 114 is switched to alternately perform heating and hot water supply. The water in the hot water storage tank 117 is not directly heated but heated via the hot water supply heat exchanger 112.

JP 2008-39305 A

However, the configuration of the conventional heat pump type cooling / heating water cooling / heating device has various problems when simply performing the cooling operation as the heat pump cooling device.
Control of boiling of the hot water storage tank 117 when switching between cooling and heating, selection of the cooling terminal 115, switching between the cooling terminal 115 and the heating terminal 108, etc. can be raised, but the biggest problem is that the refrigerant and cold water contain moisture However, when it comes into contact with outside air, it has been a big problem to generate condensation.

  The occurrence of condensation may seriously affect the functional parts such as the circulation pump 116, the safety device, and the controller board, and it is important not to cause condensation. In addition to the condensation inside the main body, the condensed water adhering to the exterior of the main body wets the floor and the back of the main body, causes mold and discoloration, and causes damage to the user's house.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a heat pump type cold / hot water cooling / heating device that prevents condensation during cooling operation, is safe, and does not impair comfort.

  In order to solve the above-mentioned conventional problems, a heat pump type cold / hot water cooling / heating device of the present invention heats and cools a refrigerant, and exchanges heat with the refrigerant and water of the heat pump cycle to form high-temperature water or cold water. A heat exchange unit including a water-refrigerant heat exchanger, a circulation circuit that circulates the water-refrigerant heat exchanger and hot water, a heating terminal that heats and cools a room, a cooling terminal, and hot water in the heat exchange unit A circulation pump that is sent to the heating terminal and the cooling terminal via a circuit; an exterior that shuts off outside air from the inside of the heat exchange unit; a heat exchange exterior thermistor that detects the surface temperature of the exterior; and the heat exchange unit Provided with a heating means, and the refrigerant cooled in the heat pump cycle is sent to the heat exchange unit, is sent to the cooling terminal as cold water, and is passed through the room. When the temperature drops to the dew point temperature and dew condensation occurs, the heating means is operated. The temperature of the main body exterior rises by the heating means, and dew condensation occurs in the main body exterior and inside. It is possible to prevent fouling due to mold on the back surface and floor surface of the heat exchange unit and condensation on the charging unit.

  The heat pump type cold / hot water cooling / heating device of the present invention keeps the main body at the dew point temperature or more, prevents condensation on the exterior, and also prevents internal condensation. It is possible to provide a heat pump type hot / cold water cooling / heating device that does not impair the comfort of preventing condensation.

The block diagram of the heat pump type cold / hot water cooling / heating apparatus in Embodiment 1 of this invention (A) Front view of heat exchange unit of heat pump type cold / hot water cooling / heating device (b) Perspective view of heat exchange unit Configuration diagram showing another example (measure plan 1) of the heat exchange unit Configuration diagram showing another example (measure plan 2) of the heat exchange unit Configuration diagram showing another example of the heat exchange unit (measure plan 3) Front view of remote control device of the same heat pump type cold / hot water cooling / heating device Characteristics chart of operating temperature and outside air temperature of the heat pump type cold / hot water cooling / heating device Characteristics of outside temperature and heat exchanger exterior thermistor and heater of the same heat pump type cold / hot water cooling / heating system Configuration diagram of conventional heat pump hot water heater Configuration diagram of a conventional heat pump type cold / hot water cooling / heating device

  A first invention includes a heat pump unit that heats and cools a refrigerant, a heat exchange unit that includes a water-refrigerant heat exchanger that exchanges heat with the refrigerant and water of the heat pump cycle to form high-temperature water or cold water, and the water refrigerant. A circulation circuit that circulates the heat exchanger and hot water, a heating terminal that cools and cools the room, a cooling terminal, and a circulation pump that sends hot water in the heat exchange unit to the heating terminal and the cooling terminal via the circulation circuit; A heat-exterior thermistor for detecting the surface temperature of the exterior, the heating means provided in the heat-exchange unit, and cooled by the heat pump cycle. When the refrigerant is sent to the heat exchange unit, sent as cold water to the cooling terminal to cool the room, the temperature drops to the dew point temperature and condensation occurs, the heating means A heat pump type cold / hot water cooling / heating device characterized by operating, the temperature of the exterior of the main body rises by the heating means, and no condensation occurs in the main body exterior and inside, and the back and floor surfaces of the heat exchange unit It is possible to prevent fouling caused by mold and condensation on the charged part.

  In particular, the second invention is provided with an input terminal that enables the humidity condition to be set in the heat exchange unit of the first invention, and the humidity is input to the input terminal with respect to the humidity condition of the summer in the area, and the operation is started. The dew point is calculated for the exterior temperature detected by the heat exchanger exterior thermistor and the set humidity immediately before the heat exchanger exterior thermistor detects and the heating means operates when the exterior temperature detected by the heat exchanger exterior thermistor drops to the dew point temperature. Therefore, there are various summer humidity conditions for the whole of Europe, and by changing the humidity setting, condensation can be prevented without consuming wasteful power.

  In particular, the third invention includes an input terminal capable of setting a humidity condition in the heat exchange unit of the first invention, and an outside temperature thermistor for detecting the outside air temperature. When the humidity is input to the input terminal, the dew point temperature is calculated for the outside air temperature detected by the outside temperature thermistor and the set humidity, and when the temperature detected by the heat exchanger exterior thermistor drops to the above dew point temperature, heating is performed. The device is operated, and the operation control of the heating device can be finely controlled with respect to the change of the outside air temperature per day, so that dew condensation can be prevented.

  In the fourth invention, in particular, when the temperature detected by each of the heat exchange exterior thermistor and the outside air temperature thermistor of the third invention is 0 ° C. or less, the heating means is operated. It can also play the role of preventing freezing in winter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
The heat pump type cold / hot water cooling / heating apparatus in Embodiment 1 of this invention is demonstrated using FIGS.

  FIG. 1 is a configuration diagram of a heat pump type cold / hot water cooling / heating device according to the first embodiment. In FIG. 1, the heat pump type cold / hot water cooling / heating device in the present embodiment is composed of three units of a heat pump unit A, a heat exchange unit B, and a tank unit C, and the heat pump unit A is installed outdoors. The heat exchange unit B and the tank unit C are installed indoors.

  And the heat pump type cold / hot water cooling and heating apparatus in this Embodiment is the water refrigerant heat exchanger 2 which heat-exchanges the compressor 1 which compresses a refrigerant | coolant, and discharges a high temperature refrigerant | coolant, and heat | fever-exchanges water and a high temperature refrigerant | coolant. And a decompressor 3 that decompresses the refrigerant, an evaporator 4a that exchanges heat between the air and the refrigerant, and a four-way valve 5 that changes the flow path of the refrigerant.

  The compressor 1, the water refrigerant heat exchanger 2, the decompressor 3, the evaporator 4 a, and the four-way valve 5 are connected in a ring shape with the refrigerant pipe 6 to constitute a heat pump cycle 39. Furthermore, the ventilation fan 4b which ventilates the evaporator 4a and accelerates | stimulates heat exchange with air and a refrigerant | coolant is provided. In addition, as a form of the water-refrigerant heat exchanger 2, there is no problem even if it is either a plate type or a double pipe type.

  Further, by arranging the water-refrigerant heat exchanger 2 in the heat exchange unit B and arranging the compressor 1, the decompression device 3, the evaporator 4a, and the four-way valve 5 in the heat pump unit A, indoor and outdoor Since the refrigerant pipe 6 is connected, there is a low possibility that the refrigerant pipe 6 is frozen even when the heat pump type cold / hot water cooling / heating device is installed in a cold district. 37 is an exterior that blocks the inside of the heat exchange unit B from the outside air.

In the present embodiment, the refrigerant is described as R410A. However, the present invention is not limited to this, and for example, a fluorocarbon refrigerant such as R407C can be used.
Further, the tank unit C has a hot water storage tank 7 for storing hot water, and has a heat exchanger 8 inside thereof, so that low temperature water is sent from the lower part of the hot water storage tank 7 to the water-refrigerant heat exchanger 2. The boiling pump 9 is provided as a circulation pump. Then, by driving the boiling pump 9, low temperature water is sent from the water outlet 10 below the hot water storage tank 7 to the water refrigerant heat exchanger 2, and the water refrigerant heat exchanger 2 generates heat from the refrigerant to generate hot water. ing. Further, the hot water generated by the water-refrigerant heat exchanger 2 is returned to the hot water inlet 11 in the intermediate part of the hot water storage tank 7. The hot water storage tank 7 is made of stainless steel.

  As described above, in the present embodiment, the boiling pump 9, the water / refrigerant heat exchanger 2, and the heat exchanger 8 constitute a circulation circuit 38 for circulating hot water.

  Further, a temperature sensor 12a for detecting the incoming water temperature is provided at the water side inlet of the water refrigerant heat exchanger 2, and a temperature sensor 12b for detecting the hot water temperature is provided at the water side outlet of the water refrigerant heat exchanger 2. Yes. Moreover, the flow switch 13 for detecting that hot water is flowing in the boiling cycle is provided.

  Fig.2 (a) is a structure front view of the heat exchange unit of the heat pump type cold / hot water cooling and heating apparatus, and FIG.2 (b) is a structure perspective view of the heat exchange unit.

As shown in FIGS. 2A and 2B, in the present embodiment, the flow switch 13 is disposed above the boiling pump 9 in the heat exchange unit B. By arranging the flow switch 13 above the boiling pump 9 in this way, it is possible to detect that the boiling pump 9 is not operating normally unless the flow switch 13 detects the flow of hot water. it can.

  In addition, an expansion tank 14 and an overpressure relief valve 15 for adjusting the pressure in the boiling cycle are provided. In the expansion tank 14, the internal volume is changed to adjust the pressure, and further in the boiling cycle. When an abnormality occurs and the internal pressure increases, the expanded hot water can be drained when the pressure exceeds the set pressure of the overpressure relief valve 15.

  A tank heater 16 is disposed in the center of the hot water storage tank 7. The tank heater 16 heats the inside of the hot water storage tank 7 with the heat exchanger 8 with hot water heated by the water / refrigerant heat exchanger 2, and is used to store hot water. The temperature of the hot water heated by the tank heater 16 is detected by the temperature sensor 17, and when it reaches the set temperature, the tank heater 16 is stopped. If an abnormality occurs in the temperature sensor 17, an overtemperature prevention device 18 is provided so that the tank heater 16 is stopped.

  A hot water supply port 19 for supplying tap water is provided at the lower part of the hot water storage tank 7, and a hot water supply port 20 for supplying hot water to the hot water supply terminal 33 is provided at the upper end of the hot water storage tank 7.

  The hot water storage tank 7 is provided with safety valves 20a and 20b in order to prevent an increase in internal pressure due to boiling.

  The operation and action of the heat pump type cold / hot water cooling / heating apparatus in the present embodiment configured as described above will be described.

  First, the boiling operation will be described. First, the user sets the boiling temperature Th of hot water in the water / refrigerant heat exchanger 2 using the remote control device 30 provided as an input terminal in the heat exchange unit B. When the boiling operation is started, the boiling pump 9 is driven, and the hot water in the hot water storage tank 7 is supplied to the water / refrigerant heat exchanger 2. Then, the heating operation by the heat pump cycle is continued until the temperature detected by the temperature sensor 12b exceeds the boiling temperature Th. When the hot water in the hot water storage tank 7 is boiled in a heat pump cycle, the four-way valve 5 is switched so that the high-temperature refrigerant discharged from the compressor 1 becomes a flow path for flowing into the water-refrigerant heat exchanger 2.

  As a result, the high-temperature refrigerant discharged from the compressor 1 flows into the water-refrigerant heat exchanger 2 and radiates heat to the hot water, thereby generating high-temperature water. In the water / refrigerant heat exchanger 2, water and the refrigerant are counterflowed to improve heat exchange efficiency.

  When the temperature of the hot water discharged from the water / refrigerant heat exchanger 2 detected by the temperature sensor 12b approaches the boiling temperature Th, the rotation speed of the compressor 1 is reduced to lower the capacity. When the temperature detected by the temperature sensor 12b is higher than the boiling temperature Th by a predetermined temperature Ta (for example, 2 ° C.), the operation of the compressor 1 is stopped and the boiling operation is terminated. The hot water storage tank 7 is filled with hot water having a boiling temperature Th.

  The high-temperature water generated by the water-refrigerant heat exchanger 2 is returned to the heating hot water section 7b, but passes through a gap formed between the partition plate 34 and the hot water storage tank 7 to pass through the hot water hot water section. 7a is also filled with hot water at the boiling temperature Th. At this time, the control device 32 stores the incoming water temperature Ti detected by the temperature sensor 12a when the operation of the compressor 1 is stopped.

Further, even after the boiling operation by the heat pump cycle is completed, the boiling pump 9 is driven to circulate the hot water in the hot water storage tank 7 to the water refrigerant heat exchanger 2. Even when the boiling operation is stopped, it is necessary to detect the temperature of the hot water in the hot water storage tank 7 with the temperature sensor 12a and the temperature sensor 12b, and as soon as the temperature of the hot water in the hot water storage tank 7 decreases. This is because the heating operation by the heat pump cycle must be resumed.

And while the hot water supply operation is stopped, the boiling pump 9 is driven and the temperature sensor 12a constantly detects the hot water in the hot water storage tank 7, and the temperature detected by the temperature sensor 12b stops the operation of the compressor 1. The operation of the compressor 1 is resumed when the temperature of the incoming water Ti becomes smaller than the stored water temperature Ti by a predetermined temperature Tb (for example, 5 ° C.), and the boiling operation is started.
For example, when 55 ° C. is set as the boiling temperature Th, the operation of the compressor 1 is stopped when the temperature detected by the temperature sensor 12b exceeds 57 ° C. (= 55 ° C. + 2 ° C.). Then, if the temperature when the operation of the compressor 1 is stopped is 53 ° C., the incoming water temperature Ti is stored as 53 ° C.

  Even after the operation of the compressor 1 is stopped, the boiling pump 9 is driven, and compression is performed when the temperature detected by the temperature sensor 12b is lower than the incoming water temperature Ti by a predetermined temperature Tb (for example, 5 ° C.). The operation of the machine 1 is resumed. Further, the predetermined temperatures Ta and Tb shown in the present embodiment are one example, and are not limited to the present embodiment.

  Further, the remote control device 30 provided in the tank unit C can set the boiling temperature in the tank heater 16. FIG. 6 is a front view of the remote control device 30. As shown in FIG. 6, the remote control device 30 includes an operation unit 30a and a display unit 30b, and the temperature can be set by operating the operation unit 30a. In the present embodiment, the boiling temperature Tk and the tank temperature Tu can be set and displayed by operating the operation unit 30a.

  In the present embodiment, the temperature Tu can be set higher than the boiling temperature Tk by the tank heater 16. For example, when the boiling temperature Tk is set to 55 ° C. with the remote control device 30 and the boiling temperature Tu is set to 75 ° C. with the remote control device 30, the water refrigerant heat exchanger 2 boils up to the boiling temperature Th (55 ° C.). Further, the tank heater 16 performs a boiling operation up to 75 ° C.

  Next, the boiling operation with the tank heater 16 will be described.

  When the operation of the tank heater 16 is started, the temperature detected by the temperature sensor 17 provided at a position higher than the tank heater 16 is lower than the boiling temperature Tk by a predetermined temperature Tc (for example, 5 ° C.). When detected, the output of the tank heater 16 is turned ON. The hot water in the upper part of the hot water storage tank 7 is warmed by the tank heater 16, and the temperature detected by the temperature sensor 17 provided at the same position as the tank heater 16 is higher than the boiling temperature Tk by a predetermined temperature Td (for example, 2 ° C.). When the temperature is detected, the output of the tank heater 16 is turned off.

  The circuit so far is a circuit for boiling the hot water storage tank 7, but a three-way valve 21 is provided in the middle to switch the circuit for cooling and heating, and when there is no need to boil hot water, the three-way valve 21 is switched to the cooling terminal 22 and the heating terminal 23. When cooling is performed, the four-way valve 5 is switched to the evaporator 4a side, and the cooled refrigerant flows into the water-refrigerant heat exchanger 2 to create cold water.

  At this time, if cold water flows through the heating terminal 23, condensation occurs and the floor gets wet. Therefore, a two-way valve 24 is provided to flow only to the cooling terminal 22.

  Thus, the countermeasure for each block regarding the condensation at the time of cooling will be described.

  First, with respect to the piping provided outside, the refrigerant piping 6 from the heat pump unit A to the heat exchange unit B, the piping from the heat exchange unit B to the tank unit C, and the piping between the heating terminal 23 and the cooling terminal 22 are insulated (not shown). ) To prevent contact with outside air containing moisture, so there is no risk of condensation.

  As for the heat pump unit A, although condensation is generated in the refrigerant pipe 6, it is a device installed outdoors, and the condensed water is originally generated from the evaporator 4a and is received by the drain pan 25 at the lower part of the main body and drained from the drain port 26. no problem. There are two problems that have been left, that is, condensation of the exterior 37 of the heat exchange unit B and internal condensation.

  Therefore, some countermeasures for preventing condensation will be described.

  The configuration shown in FIG. 3 is a plan in which the heat exchange unit B is covered with a foam-based heat insulating material and the inside of the main body is sealed, but in order to completely insulate, a thickness of 30 mm or more is necessary. When the volume is large and there is an ignition source inside, it is not preferable in terms of safety.

  4 is a method in which openings 35 are provided at the top and bottom of the heat exchange unit B to eliminate the temperature difference between the inside and outside of the main body and prevent condensation on the surface of the outer casing 37. Parts may be exposed to humid air and charging units such as the control unit 27 may cause poor insulation, and the boiling pump 9 can not heat up insulation to prevent the winding temperature from increasing during heating. In addition, a drain port 26 must be provided and drained in order to treat the internal condensed water.

  In the configuration shown in FIG. 5, in order to solve the above-described problem, the heat exchange unit B is covered with a sealed exterior 37, and the internal piping is covered with a heat insulating material except for the boiling pump 9 to cool the inside of the main body as much as possible. suppress. However, as time passes, the temperature inside the main body decreases and the temperature of the outer casing 37 of the heat exchange unit B also decreases, so that external humid air comes into contact with each other to cause dew condensation.

  In order to prevent this, the heat exchanger exterior thermistor 28 and the heater 29 are connected to the controller 27, and the tip of the heat exchanger exterior thermistor 28 is attached to the inside of the exterior 37 of the heat exchange unit B. Before the operation, the temperature at the tip of the heat exchanger exterior thermistor 28 is the same as the outside air temperature, and is stored in the control unit 27 as an outside air temperature constant. When the cooling operation is started, dew condensation occurs on the exterior 37 when the temperature inside the main body decreases due to the influence of the refrigerant and the cooling water and reaches a temperature causing dew condensation. Although the temperature at this time is called dew point temperature, this dew point temperature can be calculated by a calculation formula or a conversion table according to the outside air temperature and the outside air humidity. This calculation formula is described below.

Calculation formula for dew point temperature When the relative humidity and absolute humidity are known, the water vapor pressure is calculated from the above formula. The determined water vapor pressure is the saturated water vapor pressure at the dew point temperature.

e: Saturated water vapor pressure at dew point temperature The calculation formula for calculating the dew point humidity from the saturated water vapor pressure is as shown in equations 1-3.

  The calculation formula for calculating the dew point temperature from the saturated water vapor pressure of ice is as shown in equations 4 and 5.

  The calculation formula for calculating the dew point temperature is quite complicated and difficult, but usually, using the saturated water vapor pressure table described in JIS28806, various humidity such as relative temperature, dew point temperature, absolute temperature, etc. can be obtained. it can. When calculating and analyzing data using a personal computer, these formulas may be more convenient to use. This is an important formula for the device to judge. If the outside air temperature is 27 ° C. in summer and the humidity is 65%, the dew point temperature is around 24 ° C.

  The controller 27 inputs the summer humidity in advance, the heat exchanger exterior thermistor 28 calculates the initial temperature and summer humidity constants, calculates the dew point temperature, and the temperature of the heat exchanger exterior thermistor 28 When it reaches, the heater 29 is turned on. The heater 29 that is turned on is turned off when it is 5 ° C. higher than the calculated dew point temperature or when it exceeds the initial temperature. As a result, the temperature of the exterior 37 of the heat exchange unit B is raised by the heater 29, and no condensation occurs in the exterior 37, and the back surface and floor surface of the heat exchange unit B can be prevented from being contaminated.

  However, it is difficult to input a constant humidity condition in advance throughout Europe, and if the humidity condition is set to a higher level in view of safety, the heater 29 is likely to be turned on.

  If 100% humidity is input, the outside air temperature and the dew point temperature coincide with each other, and the heater 29 is always turned on. Even in summer, the dew point temperature is low and the heater 29 is turned on in a low humidity area, so that the running cost can be reduced.

  FIG. 6 is a front view of remote control device 30 according to the first embodiment. As shown in FIG. 6, the remote control device 30 includes an operation unit 30a and a display unit 30b, and the temperature can be set by operating the operation unit 30a.

  In this embodiment, the constant setting mode is entered by holding down the SET button 30c of the operation unit 30a for 5 seconds, and the display unit Tk for selecting the item of the humidity setting constant is selected with the ▲ ▼ button 30d. When HUM is displayed, the SELECT button 30e is pressed.

  After that, the ▲ ▼ button 30d is used to select and input the humidity concentration in the Tu display portion. After the input, the SET button 30c is finally pressed to complete the input. As a result, even if the humidity conditions in summer vary with respect to the whole of Europe, it is possible to prevent condensation without consuming wasteful power by changing the humidity setting.

  In the present embodiment, as a means for detecting the outside air temperature, the outside air temperature thermistor 31 provided in the heat pump unit A is used as the correction thermistor. This is detected even when the outside air temperature changes during the cooling operation. If it is difficult to detect the actual outside air temperature after stopping and restarting, change the setting if the equipment stops for a certain period of time and the inside and outside of the equipment does not become stable. I can't.

  FIG. 7 is a characteristic diagram of the ON temperature of the heater 29 and the outside air temperature in the first embodiment. The ON temperature of the heater 29 is determined by the temperature detected by the heat exchange exterior thermistor 28 immediately before the cooling operation. During the cooling operation, the outside air temperature changes and decreases as the daytime changes to the nighttime. However, based on the temperature measured by the outside temperature thermistor 31, the change in the outside air temperature is reflected in the ON temperature of the heater 29. Shift. As a result, an accurate dew point temperature can be determined even when the outside air temperature changes, and condensation can be prevented without consuming excess power.

  Further, in the present embodiment, the heater 29 is used as a countermeasure against dew condensation, but the heat exchange unit B is basically installed indoors, but the outside air temperature is not always 0 ° C. or higher. If the room in which the heat exchange unit B is installed is close to the same condition as the outside air under winter conditions, there is a risk of freezing if the heating operation is stopped. In order to prevent freezing, it is necessary to forcibly heat up the heat pump unit A. However, whether or not to freeze must measure the outside temperature of the heat exchange unit B, and cannot determine whether or not to boil. In addition, if boiling is performed during shutdown, it is judged as a malfunction by the customer, which may be a complaint, and some indication is required.

  In order to solve this, when the outside temperature thermistor 31 and the heat exchange exterior thermistor 28 are 0 ° C. or less, the heater 29 is turned on to raise the ambient temperature in the heat exchange unit B. If it can be confirmed that the heat exchange exterior thermistor 28 has reached 3 ° C. or higher, the heater 29 is turned off. FIG. 8 graphically shows the characteristics of the outside air temperature, the heat exchanger exterior thermistor 28 and the heater 29. As described above, the heating by the heater 29 can be used not only for preventing dew condensation but also for preventing freezing, without boiling with a heat pump.

  Even if the freeze prevention is performed in the present embodiment, when the heat exchange unit B installed indoors is installed outdoors, there is a possibility of freezing in view of the ability of the heater 29. In recent years, the movement of the heat pump hot water heater has been a movement to integrate the heat pump unit A and the heat exchange unit B and abolish the refrigerant piping work. In such a case, it is necessary to keep the heat exchange unit B outdoors. These measures must be further strengthened. Piping that can be circulated by the boiling pump 9 can prevent freezing by circulating hot water. However, for parts such as the expansion tank 14 and the overpressure relief valve 15 that are not in the circulation circuit 38, hot water cannot be circulated through the piping, and if the piping freezes, there is a possibility of causing an abnormality in the equipment.

  In this embodiment, by providing a heater 29 that raises the ambient temperature in the main body in a portion other than the circulation circuit 38, functional parts such as the expansion tank 14 and the overpressure relief valve 15 are protected from freezing and the function is impaired. It is possible to provide a heat pump type cold / hot water cooling / heating device that does not have any.

In addition, a drain plug (not shown) is provided at the lower part of the hot water storage tank 7.
The hot water inside can be drained to the outside.

  As described above, the heat pump type cold / hot water cooling / heating device according to the present invention does not decrease the atmospheric temperature in the main body even during the cooling operation, suppresses the occurrence of condensation inside and outside the main body, and stains the back surface and floor surface of the main body. In addition, it is possible to provide cooling and heating that can prevent freezing even when the outside air temperature decreases at the same time.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Water refrigerant | coolant heat exchanger 3 Pressure reducing device 4a Evaporator 4b Blower fan 5 Four way valve 6 Refrigerant piping 7 Hot water storage tank 8 Heat exchanger 9 Boiling pump (circulation pump)
DESCRIPTION OF SYMBOLS 10 Water outlet 11 Hot water inlet 12a, 12b Temperature sensor 13 Flow switch 14 Expansion tank 15 Overpressure relief valve 16 Tank heater 17 Temperature sensor 18 Overtemperature prevention apparatus 19 Water supply port 20a, 20b Safety valve 21 Three-way valve 22 Cooling terminal 23 Heating terminal 24 Two-way valve 25 Drain pan 26 Drain port 27 Control unit 28 Heat exchange exterior thermistor 29 Heater (heating means)
30 Remote control device (input terminal)
31 Outside temperature thermistor 32 Control device 37 Exterior 38 Circulating circuit 39 Heat pump cycle A Heat pump unit B Heat exchange unit C Tank unit

Claims (4)

A heat pump cycle that heats and cools the refrigerant; a heat exchange unit that includes a water refrigerant heat exchanger that exchanges heat with the refrigerant and water of the heat pump cycle to form high-temperature water or cold water; and the water refrigerant heat exchanger and hot water. A circulation circuit that circulates, a heating terminal that heats and cools the room, a cooling terminal, a circulation pump that sends hot water in the heat exchange unit to the heating terminal and the cooling terminal via the circulation circuit, and an interior of the heat exchange unit And a heat exchange exterior thermistor for detecting the surface temperature of the exterior, and heating means provided in the heat exchange unit, and the refrigerant cooled in the heat pump cycle is the heat exchange unit. When the water is cooled and sent to the cooling terminal to cool the interior of the room and the condensation drops to the dew point temperature, the heating means is operated. The heat pump chiller cooling heating device according to claim. The heat exchange unit is provided with an input terminal that can set a humidity condition, and the humidity is input to the input terminal with respect to the humidity condition in summer in the area, and the exterior temperature detected by the heat exchanger exterior thermistor immediately before the operation is started. 2. The heat pump according to claim 1, wherein a dew point temperature is calculated with respect to a set humidity, and the heating unit is operated when the exterior temperature detected by the heat exchanger exterior thermistor decreases to the dew point temperature. Type hot / cold water cooling / heating equipment. An input terminal that enables the humidity condition to be set in the heat exchange unit, and an outside temperature thermistor that detects the outside air temperature. The humidity is input to the input terminal with respect to the humidity condition in summer in the area, and the outside temperature thermistor The dew point temperature is calculated for the detected outside air temperature and the set humidity, and the heating means is operated when the temperature detected by the heat exchanger exterior thermistor decreases to the dew point temperature. The heat pump type cold / hot water cooling / heating apparatus of description. The heat pump type cold / hot water cooling / heating device according to claim 3, wherein the heating means is operated when the temperature detected by each of the heat exchange exterior thermistor and the outside air temperature thermistor is 0 ° C. or less.