JP6528078B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner that uses a refrigerant to form a refrigeration cycle to perform cooling or heating, and uses outside air as a heat source and technology that uses other heat sources to improve performance.

  In recent years, the operating efficiency of air conditioners has been emphasized from the viewpoint of preventing global warming. As a result, the efficiency of the compressor and the blower and the performance of the heat exchanger are improved.

  In compressors and blowers, it is possible to use an inverter, adopt expensive rare earth magnets for the rotor of the motor, or use a stator with a specification with many turns whose high-speed operation was difficult due to improvement of the motor drive system. We have achieved a reduction in power consumption.

  With regard to heat exchangers, the amount of input tends to increase year by year to improve performance, and the size of air conditioners also tends to increase. On the other hand, development of fins with excellent heat exchange performance has been developed by devising the fin shape and bending shape, and technology to achieve high performance by optimizing the capillary tube diameter of the refrigerant pipe and tube diameter change has also been developed. There is.

  While improving the performance of each of these elements, efforts are also being made to improve the operating efficiency of the air conditioner and reduce the power consumption by using heat sources that have not been used conventionally, such as solar heat and ground heat.

  Solar heat can not be used for cooling, but when it is used for heating, depending on the design of the device, a temperature sufficient for direct use can be obtained. Moreover, even if only a temperature lower than the temperature that can be directly used for heating can be obtained, efficient heating can be performed if it is used for the evaporator (heat absorption).

  In the case where solar heat is used for heating, it is desirable to perform heat storage since the heat collection available time zone and the time zone to be used do not necessarily coincide.

  The underground temperature of 10m underground is stable (around 15 ° C) throughout the year. In addition, even if the underground temperature is 1 to 2 m deep, the temperature is maintained at about 10 ° C in winter and about 25 ° C in summer. Therefore, geothermal heat can be used for cooling in summer and for heating in winter.

  For example, if a conventional example is given about an apparatus using underground heat, in the apparatus of patent document 1, the 2nd heat exchanger is provided in parallel with the outdoor heat exchanger. The second heat exchanger is housed in a container buried in the ground and filled with antifreeze liquid. Stable heating and cooling capacity is to be obtained by combining ambient air and ground heat.

  That is, during heating operation, the refrigerant gas discharged from the compressor is condensed (radiated) in the indoor heat exchanger, passed through the pressure reducing device, and then evaporated (heat absorbed) in the outdoor heat exchanger and the second heat exchanger. , Is again sucked into the compressor. As described above, two evaporators (endothermic) are provided, and the heat absorption amount is increased, and the heat radiation amount (heating capacity) from the indoor unit is also increased. On the other hand, during cooling operation, the underground temperature is lower than the midsummer outside air temperature, and the heat radiation effect is high, and by having two condensers, a large cooling capacity can be obtained even when the midsummer outside air temperature is high. It is supposed to be possible.

  Furthermore, the device described in Patent Document 2 is an air conditioner provided with a heat pump circuit including a compressor, an indoor heat exchanger, a pressure reducing device, and a heat pump circuit formed by annularly connecting an outdoor heat exchanger, A heat pipe which is buried in the ground and provided on the ground so as to be located on the windward side of the outdoor heat exchanger is provided. By combining an outdoor heat exchanger and a heat pipe for collecting heat from the ground, it is possible to draw up heat from the outside air and the ground and to prevent a decrease in heating capacity in a cold area.

  In this air conditioner, underground heat is used to preheat air that is applied to the outdoor heat exchanger, and there is no need to change the refrigerant circuit, and the heat pipe is a brine circulation type underground heat utilization method Can be used during cooling operation.

Unexamined-Japanese-Patent No. 1-189465 Unexamined-Japanese-Patent No. 6-241611

  However, the relationship between the ground temperature and the outside temperature is not always constant, and there are cases where heat exchange with only the outside air is more effective than using the ground heat. For example, during a sunny winter day, the temperature may rise above the ground temperature, or may fall below the ground temperature during the summer night. In addition, the relationship between the air conditioning load and the heat output from the ground is not constant. For this reason, the ideal relationship between the outdoor heat exchanger and the heat exchanger using ground heat is not always the same.

  Even when solar heat is stored and used, change in the amount of stored heat can not be avoided due to the weather, etc., and the temperature of stored heat also changes. For this reason, the ideal relationship between the outdoor heat exchanger and the heat exchanger utilizing heat storage is not always the same.

  That is, as in the prior art, when the air conditioner is specialized for an arbitrary operating condition and the relationship between the outdoor heat exchanger and the second heat exchanger using other heat sources such as ground heat and solar heat is fixed, There is a problem that other heat sources can not be effectively used under operating conditions different from the ones that have been developed.

  Therefore, the present invention solves these problems, and provides an air conditioner capable of reducing power consumption by performing desirable heat collection or heat release from the outside air and other heat sources.

  In order to solve the above-mentioned conventional problems, the air conditioner of the present invention is an outdoor heat exchanger that exchanges heat with outside air, and another heat source utilizing heat exchanger that utilizes cold or warm heat obtained from a heat source other than the outside air. And switching means for switching the connection relationship between the outdoor heat exchanger and the other heat source utilization heat exchanger, wherein the connection relationship between the outdoor heat exchanger and the other heat source utilization heat exchanger can be switched. .

  Thus, the connection relationship between the outdoor heat exchanger with good operation efficiency and the other heat source utilization heat exchanger can be selected according to the operation condition.

  The air conditioner according to the present invention can select the connection relationship between the outdoor heat exchanger with good operation efficiency and the other heat source utilization heat exchanger according to the operating conditions. Therefore, the power consumption of the air conditioner of this invention can be reduced, and the apparatus excellent in energy saving property can be provided.

System configuration of the air conditioner according to the first embodiment of the present invention System configuration diagram of an air conditioner according to Embodiment 2 of the present invention System configuration diagram of an air conditioner according to Embodiment 3 of the present invention

  According to a first aspect of the present invention, there is provided a compressor for compressing a refrigerant, an outdoor heat exchanger for exchanging heat with outside air, a first adjusting valve connected to a low enthalpy side of the outdoor heat exchanger, and the outside air. Another heat source utilization heat exchanger that utilizes cold or warm heat obtained from a heat source, a second regulating valve connected to the low enthalpy side of the other heat source utilization heat exchanger, the outdoor heat exchanger and the other heat source utilization Switching means for switching the connection of heat exchangers, indoor heat exchanger for exchanging heat with indoor air, outside air temperature detection means for detecting the temperature of the outside air, and temperature of the heat medium conveyed from the heat source The outdoor heat exchanger, the control means for controlling the switching means in accordance with at least one of the output of the outside air temperature detection means and the output of the heat medium temperature detection means; Said other heat source utilization heat It is one which allows switching the connection relationship exchanger.

  Thereby, according to the said driving | running condition, the connection relation of the said outdoor heat exchanger with sufficient driving efficiency and the said other heat source utilization heat exchanger can be selected. Therefore, the power consumption of the air conditioner of this invention can be reduced, and the apparatus excellent in energy saving property can be provided.

  2nd invention is piping connected to said 1st control valve in 1st invention, Comprising: It is piping connected to said outdoor heat exchanger, and piping connected to said 2nd control valve. The other heat source utilization heat exchanger and the piping on the opposite side are joined and connected to the indoor heat exchanger, and the gas side piping of the outdoor heat exchanger and the high enthalpy side piping of the other heat source utilization heat exchanger Are connected to the discharge port or suction port of the compressor, and the first control valve disposed in the gas side pipe of the outdoor heat exchanger to open and close as the switching means, and the other heat source utilization A second control valve disposed in the high enthalpy side piping of the heat exchanger and performing opening and closing, between the outdoor heat exchanger and the first control valve, and the other heat source utilization heat exchanger and the second regulating valve Gas side low enthalpy side connection piping connecting the A third control valve disposed in the connection pipe on the side of the thalpy side for opening and closing, the first control valve, the second control valve, the first control valve, the second control valve, and the third control valve The operation is controlled by the control means.

  Thereby, the connection relationship between the outdoor heat exchanger and the other heat source utilization heat exchanger is added alone or in parallel, and the other heat source utilization heat exchanger is connected in series to the gas side of the outdoor heat exchanger It can be arranged. Therefore, the choice of the connection relation between the outdoor heat exchanger and the other heat source utilization heat exchanger is increased, and the power consumption of the air conditioner of the present invention is further reduced particularly in heating operation, and a device having more energy saving performance is provided. be able to.

  3rd invention is piping connected to said 1st control valve in 1st invention, Comprising: It is piping connected to said outdoor heat exchanger, and piping connected to said 2nd control valve. The other heat source utilization heat exchanger and the piping on the opposite side are joined and connected to the indoor heat exchanger, and the gas side piping of the outdoor heat exchanger and the high enthalpy side piping of the other heat source utilization heat exchanger Are connected to the discharge port or suction port of the compressor, and the first control valve disposed in the gas side pipe of the outdoor heat exchanger to open and close as the switching means, and the other heat source utilization A second control valve disposed on the high enthalpy side piping of the heat exchanger and performing opening and closing, between the outdoor heat exchanger and the first control valve, and the other heat source utilization heat exchanger and the second control valve Liquid side high enthalpy side connecting pipe connecting between A fourth control valve disposed in the P-side connection pipe for opening and closing, the first control valve, the second control valve, the first control valve, the second control valve, and the fourth control valve The operation is controlled by the control means.

  Thereby, the connection relationship between the outdoor heat exchanger and the other heat source utilization heat exchanger is added alone or in parallel, and the other heat source utilization heat exchanger is connected in series to the liquid side of the outdoor heat exchanger It can be arranged. Therefore, the choice of the connection relation between the outdoor heat exchanger and the other heat source utilization heat exchanger is increased, and the power consumption of the air conditioner of the present invention is further reduced, particularly in the cooling operation, to provide a device more excellent in energy saving performance. can do.

  A fourth invention according to the second invention or the third invention, wherein a difference value obtained by subtracting the output value of the outside air temperature detection means from the output value of the heat medium temperature detection means is the first value if the cooling operation is performed. If the heating operation is larger than the first cooling threshold, the first control valve is opened and the second control valve or the second adjusting valve is closed. Close the third control valve or the fourth control valve, adjust the first adjustment valve, and operate using only the outdoor heat exchanger without using the other heat source utilization heat exchanger It is a thing.

  As a result, it is possible to use a heat source suitable for the corresponding operating condition. Therefore, the most energy-saving operation can be performed at the corresponding operating conditions.

  A fifth invention according to the second invention is that, if the difference value obtained by subtracting the output value of the outside air temperature detection means from the output value of the heat medium temperature detection means is the cooling operation, the first cooling The second control valve and the third control valve are opened when the heating operation is greater than the first heating threshold and smaller than the second heating threshold if the heating operation is larger than the second cooling threshold and smaller than the threshold. Closing the first control valve and the second control valve, adjusting the first control valve, and connecting the other heat source utilization heat exchanger in series to the gas side of the outdoor heat exchanger It is something to drive.

  As a result, it is possible to use a heat source suitable for the corresponding operating condition. Therefore, it is possible to provide a device having the most energy saving performance under the corresponding operating conditions.

  A sixth invention according to the second invention or the third invention, wherein the difference value obtained by subtracting the output value of the outside air temperature detection means from the output value of the heat medium temperature detection means is the time of the cooling operation. If the heating operation is performed when the first cooling threshold or the second cooling threshold is less than the third cooling threshold or the fourth cooling threshold, the first heating threshold or the second heating threshold Open the first control valve and the second control valve and close the third control valve or the fourth control valve if the third heating threshold or the fourth heating threshold is smaller than the third heating threshold or the fourth heating threshold; The first adjustment valve and the second adjustment valve are adjusted, and the outdoor heat exchanger and the other heat source utilization heat exchanger are connected in parallel and operated.

  As a result, it is possible to use a heat source suitable for the corresponding operating condition. Therefore, it is possible to provide a device having the most energy saving performance under the corresponding operating conditions.

  The seventh invention is the invention according to the third invention, wherein the difference value obtained by subtracting the output value of the outside air temperature detection means from the output value of the heat medium temperature detection means is the third value when the cooling operation is performed. The first control valve and the first control valve in the case of heating operation when the temperature is lower than the cooling threshold and larger than the fourth cooling threshold and smaller than the third heating threshold in the heating operation. 4. Open the control valve 4 and close the second control valve and the first control valve to adjust the second control valve, and the other heat source utilization heat exchanger on the liquid side of the outdoor heat exchanger Are connected in series.

  As a result, it is possible to use a heat source suitable for the corresponding operating condition. Therefore, it is possible to provide a device having the most energy saving performance under the corresponding operating conditions.

  In an eighth aspect based on the second aspect or the third aspect, the difference value obtained by subtracting the output value of the outside air temperature detection means from the output value of the heat medium temperature detection means is the cooling operation as long as it is in a cooling operation. In the case of heating operation when the temperature is equal to or lower than the fourth cooling threshold, the first control valve or the first adjustment valve is closed and the second control valve is opened if the fourth heating threshold is exceeded. Close the third control valve or the fourth control valve, adjust the second control valve, and operate using only the other heat source utilization heat exchanger without using the outdoor heat exchanger It is.

  As a result, it is possible to use a heat source suitable for the corresponding operating condition. Therefore, the most energy-saving operation can be performed at the corresponding operating conditions.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by the embodiment.

Embodiment 1
FIG. 1 shows a configuration diagram of an air conditioner according to Embodiment 1 of the present invention. Note that FIG. 1 shows the four-way valve 6 in the cooling operation mode.

  As shown in FIG. 1, the air conditioner according to the first embodiment includes an indoor unit 1 including an indoor heat exchanger 2 and an indoor blower 3, a compressor 5, a four-way valve 6, and an outdoor heat exchanger 7. An outdoor unit 4 including an outdoor fan 8 and a first expansion valve 10 which is a first adjustment valve is connected by piping, a communication line or the like. Then, the compressor 5, the four-way valve 6, the outdoor heat exchanger 7, the first expansion valve 10, and the indoor heat exchanger 2 are connected in order by piping to constitute a refrigeration cycle circuit. The refrigeration cycle circuit functions as a refrigeration cycle or a heat pump cycle, and the air conditioner can perform cooling operation or heating operation.

  In the case of the cooling operation, as shown in FIG. 1, the four-way valve 6 causes the discharge side of the compressor 5 to communicate with the outdoor heat exchanger 7, and the suction side of the compressor 5 and the indoor heat exchanger 2. To be communicated. That is, in the case of the cooling operation, when the refrigerant is discharged from the compressor 5, the refrigerant flows with the four-way valve 6, the outdoor heat exchanger 7, the first expansion valve 10, the indoor heat exchanger 2, and is compressed via the four-way valve 6. Return to Machine 5.

  On the other hand, in the case of the heating operation, the four-way valve 6 causes the suction side of the compressor 5 to communicate with the outdoor heat exchanger 7 and causes the discharge side of the compressor 5 to communicate with the indoor heat exchanger 2 Is switched to That is, in the case of the heating operation, when the refrigerant is discharged from the compressor 5, the refrigerant flows with the four-way valve 6, the indoor heat exchanger 2, the first expansion valve 10, the outdoor heat exchanger 7, and is compressed via the four-way valve 6. Return to Machine 5.

  In the refrigeration cycle circuit, the first expansion valve 10 is provided on the liquid side piping side (low enthalpy side) of the outdoor heat exchanger 7, that is, on the outlet side during cooling operation and on the inlet side during heating operation.

  Furthermore, in order to use cold energy or heat energy obtained from a heat source other than the outside air (for example, underground heat), the outdoor unit 4 includes another heat source utilization heat exchanger 9 and a second expansion valve 11 which is a second adjusting valve. Is equipped. In the refrigeration cycle circuit, one end of the other heat source utilization heat exchanger 9 is connected between the four-way valve 6 and the outdoor heat exchanger 7, and the other end is the first expansion valve 10 and the indoor heat exchanger 2. Connected between. In the other heat source utilization heat exchanger 9, the brine which is a heat medium is sent to the underground heat source 18 by the pump 17, and the geothermal heat is recovered and carried.

  The second expansion valve 11 is provided on the low enthalpy side of the other heat source utilization heat exchanger 9, that is, the outlet side in the cooling operation and the inlet side in the heating operation.

  In the air conditioner according to the first embodiment, the outside air temperature sensor 16 for detecting the temperature of air flowing into the outdoor heat exchanger 7 and the heat medium for detecting the temperature of the heat medium flowing into the other heat source utilization heat exchanger 9 A temperature sensor 19 is provided.

  Furthermore, the refrigeration cycle circuit includes switching means for switching the connection relationship between the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9. As switching means, the heat exchange valve 12 which is the first control valve disposed in the gas side pipe (pipe on the side to which the four-way valve 6 is connected) of the outdoor heat exchanger 7 and which opens and closes The other heat source heat switching valve 13 which is a second control valve disposed on the high enthalpy side (the side to which the four-way valve 6 is connected) of the exchanger 9 and which opens and closes, the outdoor heat exchanger 7 and the first expansion valve 10 The liquid side high enthalpy side connecting pipe 20 connecting between the other heat source utilization heat exchanger 9 and the other heat source heat exchange on-off valve 13 and the liquid side high enthalpy side connecting pipe 20 A liquid gas on-off valve 14 which is a control valve of No. 4 is provided.

  In the air conditioner according to the first embodiment, the number of rotations of the compressor 5, switching of the four-way valve 6, and the number of rotations of the indoor fan 3 according to the output of the outside air temperature sensor 16 and the heat medium temperature sensor 19, etc. Control to adjust the rotational speed of the outdoor fan 8, the opening degree of the first expansion valve 10 and the second expansion valve 11, the external heat exchange valve 12, the other heat source heat exchange valve 13, and the open / close state of the liquid gas on-off valve 14 An apparatus 15 is provided.

  The first expansion valve 10, the second expansion valve 11, the external heat exchange valve 12, the other heat source heat exchange valve 13, the liquid gas on-off valve 14 have the output of the outside air temperature sensor 16 and the heat medium temperature sensor 19, and the compressor It is controlled by the control device 15 according to the operating conditions such as the number of revolutions of 5, and the connection state of the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 is set optimally.

  That is, in the air conditioner according to the first embodiment, the outdoor heat exchanger 7 and heat from other heat sources are utilized according to operating conditions such as the output of the outside air temperature sensor 16 and the heat medium temperature sensor 19 and the rotational speed of the compressor 5. By switching the connection state of the exchanger 9 appropriately, other heat sources can be effectively used, power consumption is reduced, and the apparatus is excellent in energy saving performance.

  In the first embodiment, opening and closing of the first expansion valve 10, the second expansion valve 11, the external heat exchange valve 12, the other heat source heat exchange valve 13, and the liquid gas on-off valve 14 are performed by the heat medium temperature sensor 19. According to the difference ΔT between the output value Tt and the output value Ta of the outside air temperature sensor 16, it operates as in (Table 1) and (Table 2), and the connection state of the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 Set the best.

  (Table 1) indicates the opening and closing of each valve at the time of the cooling operation by “o” and “x”. "O" indicates that the valve shown in the leftmost column is in the open state, and "x" indicates that the valve is in the closed state. In addition, about the 1st expansion valve 10 and the 2nd expansion valve 11, the open state shown by "(circle)" shall include the state which is an opening degree suitable for pressure-reducing other than a full open state.

  In Table 1, the first cooling threshold ΔTc1 is a threshold for determining whether or not the outdoor heat exchanger 7 is used alone during the cooling operation, and the third cooling threshold ΔTc3 is the outdoor heat exchanger 7 The fourth cooling threshold ΔTc4, which is the fourth cooling threshold, is used to determine whether to use the other heat source utilization heat exchanger 9 in parallel or to use the other heat source utilization heat exchanger 9 in series on the liquid side. It is a threshold value for determining whether to use the device 9 alone. Note that ΔTc4 <ΔTc3 <ΔTc1.

  In the first embodiment, it is switched whether the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 are connected in parallel or the other heat source utilization heat exchanger 9 is connected downstream as ΔT becomes ΔTc3.

  First, in the case of cooling operation, in the case of ΔTc1 ≦ ΔT, the first expansion valve 10 and the external heat exchange valve 12 are opened, and the liquid gas on-off valve 14, the second expansion valve 11, other heat source heat exchange on-off The valve 13 is closed. The first expansion valve 10 is adjusted to an opening degree suitable for depressurizing the refrigerant. As a result, the refrigerant discharged from the compressor 5 flows to the outdoor heat exchanger 7 and does not flow to the other heat source utilization heat exchanger 9. The refrigerant leaving the outdoor heat exchanger 7 is depressurized by the first expansion valve 10. The second expansion valve 11 is preferably an expansion valve capable of completely closing the refrigerant flowing through the valve.

  In general, in the case of cooling operation, there is no great advantage in utilizing the ground heat if the temperature of the brine sent from the ground heat source 18 is higher than the outside air temperature. However, the condensation temperature inevitably becomes higher than the outside air temperature Ta if only the outdoor heat exchanger 7 is used. Here, if the brine temperature is higher than the outside air temperature Ta but lower than the condensation temperature when only the outdoor heat exchanger 7 is used, there is a certain value in using the other heat source utilization heat exchanger 9.

  Therefore, a value larger than 0 is appropriate for .DELTA.Tc1, and the higher the rotational speed of the compressor 5, the larger the tendency tends to be. Conversely, when looking at the capacity ratio of the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9, if the outdoor heat exchanger 7 is dominant, ΔTc 1 tends to decrease.

In the case of ΔTc3 ≦ ΔT <ΔTc1, the first expansion valve 10, the second expansion valve 11, the external heat exchange valve 12, the other heat source heat exchange valve 13 are opened, and the liquid gas on-off valve 14 is closed. Do. The first expansion valve 10 and the second expansion valve 11 are adjusted to an opening degree appropriate for reducing the pressure of the refrigerant passing therethrough. Thereby, the refrigerant discharged from the compressor 5 flows in parallel to the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9. The refrigerant leaving the outdoor heat exchanger 7 is depressurized by the first expansion valve 10, and the refrigerant exiting the other heat source utilization heat exchanger 9 is depressurized by the second expansion valve 11.

  If the temperature of the brine sent from the underground heat source 18 is the same temperature as the outside air temperature (that is, ΔT is ΔTc1 or less), the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 are used in parallel Is desirable. This is because there is no temperature difference between the outside air temperature and the brine, so the ultimate temperature of the condensation outlet (the temperature after condensation) does not change significantly.

  Next, in the case of ΔTc4 ≦ ΔT <ΔTc3, the second expansion valve 11, the external heat exchange valve 12, the liquid gas on-off valve 14 are opened, and the first expansion valve 10 and the other heat source heat exchange valve 13 are opened. It is closed. The second expansion valve 11 is adjusted to an opening degree suitable for reducing the pressure of the refrigerant. Thus, the refrigerant discharged from the compressor 5 flows through the outdoor heat exchanger 7 and then flows into the other heat source utilization heat exchanger 9. The refrigerant leaving the other heat source utilization heat exchanger 9 is depressurized by the second expansion valve 11. The first expansion valve 10 is preferably an expansion valve capable of completely closing the refrigerant flowing through the valve.

  When the brine temperature is lower than the ambient temperature, it is desirable to place the other heat source utilizing heat exchanger 9 downstream because the ultimate temperature of the condensation outlet can be lowered. In particular, when the capacity of heat exchange is sufficient and the outdoor heat exchanger 7 and the other heat source utilizing heat exchanger 9 have a low rotational speed of the compressor 5 where the effect of using in parallel is reduced, it is better to connect in series It is possible to lower the temperature reached and it is effective.

  Therefore, the lower the rotational speed of the compressor 5 is, the earlier the switching is performed, that is, the threshold value ΔTc3 may be set to be larger. On the contrary, when the rotation speed of the compressor 5 is high, the effect of lowering the condensation temperature is large, so it is preferable to aim at the effect of lowering the condensation temperature by making ΔTc 3 smaller. Furthermore, if the capacity ratio between the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 is superior to the outdoor heat exchanger 7, the effect of lowering the condensation temperature by the other heat source utilization heat exchanger 9 is reduced. It is desirable to increase ΔTc3 in order to reduce the

  When ΔT <ΔTc4, the second expansion valve 11 and the other heat source heat exchange valve 13 are opened, and the first expansion valve 10, the external heat exchange valve 12 and the liquid gas on-off valve 14 are closed. Do. The second expansion valve 11 is adjusted to an opening degree suitable for reducing the pressure of the refrigerant. Accordingly, the refrigerant discharged from the compressor 5 flows to the other heat source utilization heat exchanger 9 and does not flow to the outdoor heat exchanger 7. The refrigerant leaving the other heat source utilization heat exchanger 9 is depressurized by the second expansion valve 11.

  It is desirable to use only the underground heat source 18 when the brine temperature is further lowered and ΔT becomes smaller than ΔTc4. At this time, as the rotation speed of the compressor 5 increases, a large temperature difference is required, and ΔTc4 decreases. Also, as the capacity ratio between the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 is superior to the outdoor heat exchanger 7, ΔTc4 must be smaller in order to increase the capacity of the other heat source utilization heat exchanger 9.

  Table 2 shows the opening and closing of each valve during the heating operation. As in (Table 1), the first heating threshold ΔTh1 is a threshold for determining whether the outdoor heat exchanger 7 is used alone during heating operation, and the third heating threshold ΔTh3 is an outdoor heat exchange The threshold for determining whether to use the heat exchanger 7 and the other heat source utilization heat exchanger 9 in parallel or to use the other heat source utilization heat exchanger 9 in series on the liquid side The threshold value is used to determine whether the heat exchanger 9 is used alone. Note that ΔTh1 <ΔTh3 <ΔTh4.

First, in the case of heating operation, in the case of ΔT <ΔTh1, the first expansion valve 10 and the external heat exchange valve 12 are opened, and the liquid gas on-off valve 14, the second expansion valve 11, other heat source heat exchange open and close The valve 13 is closed. The first expansion valve 10 is adjusted to an opening degree suitable for depressurizing the refrigerant. by this,
The refrigerant that has left the indoor heat exchanger 2 is reduced in pressure by the first expansion valve 10, and then flows to the outdoor heat exchanger 7 and does not flow to the other heat source utilization heat exchanger 9.

  In general, in the case of heating operation, if the temperature of the brine sent from the ground heat source 18 is lower than the outside temperature, there is no great advantage in utilizing the ground heat. However, in practice, if only the outdoor heat exchanger 7 is used, the evaporation temperature inevitably becomes lower than the outside air temperature Ta. Here, if the brine temperature is lower than the outside air temperature Ta but higher than the evaporation temperature when only the outdoor heat exchanger 7 is used, there is a certain value in using the other heat source utilization heat exchanger 9.

  Accordingly, a value smaller than 0 is appropriate for ΔTh1, and the higher the rotational speed of the compressor 5, the smaller the tendency. Conversely, if the capacity ratio between the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 is superior to the outdoor heat exchanger 7, then the heat of the underground heat source 18 can be used in a large amount of heat. Since the heat exchanger 9 is used, ΔTh1 tends to be large.

  When ΔTh1 ≦ ΔT <ΔTh3, the first expansion valve 10, the second expansion valve 11, the external heat exchange valve 12, and the other heat source heat exchange valve 13 are opened, and the liquid gas on-off valve 14 is closed. Do. The first expansion valve 10 and the second expansion valve 11 are adjusted to an opening degree appropriate for reducing the pressure of the refrigerant passing therethrough. As a result, the refrigerant leaving the indoor heat exchanger 2 is reduced in pressure by the first expansion valve 10, and then flows into the outdoor heat exchanger 7, and after being reduced in pressure by the first expansion valve 10, other heat sources are used It flows in parallel with the flow flowing into the heat exchanger 9.

  If the temperature of the brine sent from the underground heat source 18 is the same temperature as the outside air temperature (that is, ΔT is ΔTh1 or less), the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 are used in parallel Is desirable. There is no temperature difference between the outside air temperature and the brine, and the end temperature of evaporation does not change.

  Next, in the case of ΔTh3 ≦ ΔT <ΔTh4, the second expansion valve 11, the external heat exchange valve 12, and the liquid gas on-off valve 14 are opened, and the first expansion valve 10 and the other heat source heat exchange valve 13 are opened. It is closed. The second expansion valve 11 is adjusted to an opening degree suitable for reducing the pressure of the refrigerant. As a result, the refrigerant leaving the indoor heat exchanger 2 is reduced in pressure by the second expansion valve 11, and then flows through the other heat source utilization heat exchanger 9, and then flows into the outdoor heat exchanger 7.

  In the first embodiment, during the heating operation, the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 are used in parallel or in a series use where the other heat source utilization heat exchanger 9 is disposed upstream.

  The effect is obtained in series in which the other heat source utilizing heat exchanger 9 is disposed upstream, when the brine temperature becomes higher than the ambient temperature, and at this time the expansion valve controls one of the second expansion valves 11 As a result, it is easy to adjust the aperture and it is possible to operate at the optimal aperture setting. In the case of parallel, both the first expansion valve 10 and the second expansion valve 11 are adjusted, and it is difficult to control each of them to be optimal.

  At this time, the higher the rotational speed of the compressor 5, the lower the evaporation temperature. Therefore, even if ΔT is small, the effect is obtained, so the threshold ΔTh3 becomes small, and heat exchange between the outdoor heat exchanger 7 and the other heat source is performed. If the capacity ratio of the unit 9 is superior to the outdoor heat exchanger 7, the influence of the capacity decrease due to the evaporation temperature increase in the other heat source utilization heat exchanger 9 is small, and the threshold ΔTh3 becomes large.

Then, in the case of ΔTh4 ≦ ΔT, the second expansion valve 11 and the other heat source heat exchange valve 13 are opened, and the first expansion valve 10, the external heat exchange valve 12 and the liquid gas on-off valve 14 are closed. Do. The second expansion valve 11 is adjusted to an opening degree suitable for reducing the pressure of the refrigerant. As a result, the refrigerant leaving the indoor heat exchanger 2 is reduced in pressure by the second expansion valve 11, and then flows to the other heat source utilization heat exchanger 9 and does not flow to the outdoor heat exchanger 7.

  It is desirable to use only the ground heat source 18 when the brine temperature is further raised and ΔT becomes larger than ΔTh4. As the rotation speed of the compressor 5 becomes higher, a larger capacity is required, and ΔTh4 becomes larger. In addition, as the capacity ratio of the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 is superior to the outdoor heat exchanger 7, the capacity increase of the other heat source utilization heat exchanger 9 is required, and ΔTc 4 tends to increase doing.

  In the first embodiment, the switching means is disposed on the gas side pipe of the outdoor heat exchanger 7 to perform opening and closing, and is disposed on the high enthalpy side of the other heat source utilization heat exchanger 9 and opened and closed. Liquid-side high enthalpy connecting the other heat source heat exchange on-off valve 13, the space between the outdoor heat exchanger 7 and the first expansion valve 10, and the other heat source utilization heat exchanger 9 and the other heat source heat exchange on-off valve 13 It is comprised by the liquid gas on-off valve 14 arrange | positioned in the side connection piping 20, and opening and closing. Depending on the switching means, the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 may be used alone or in parallel, or the other heat source utilization heat exchanger 9 may be connected in series to the liquid side of the outdoor heat exchanger 7 You can choose to be placed in

  And, when the other heat source utilization heat exchanger 9 is arranged in series on the liquid side of the outdoor heat exchanger 7, it exerts a great effect especially in the cooling operation, reducing the power consumption of the air conditioner of the present invention, saving energy. It is possible to provide an excellent device.

  Furthermore, according to the first embodiment, by performing control according to (Table 1) and (Table 2), it is possible to use a heat source suitable for the corresponding operating condition, and appropriately operate the device excellent in energy saving performance. .

  In the air conditioner of the first embodiment, ground heat is used as the other heat source, but river water, solar heat, thermal storage such as a snow room, exhaust heat of a refrigerator or heat pump, etc. may be used. Absent. Further, the refrigerant sealed in the refrigeration cycle circuit can obtain an effect regardless of the type.

Second Embodiment
FIG. 1 shows a configuration diagram of an air conditioner according to Embodiment 2 of the present invention. In addition, in FIG. 2, the four-way valve 6 has shown the state in the case of heating operation.

  The air conditioner according to the second embodiment, as shown in FIG. 2, is the indoor unit 1 including the indoor heat exchanger 2 and the indoor blower 3, the compressor 5, the four-way valve 6, as in the first embodiment. An outdoor heat exchanger 7, an outdoor fan 8, and an outdoor unit 4 provided with a first expansion valve 10, which is a first adjustment valve, are connected to form a refrigeration cycle or a heat pump cycle, and a cooling operation or a heating operation is performed.

  In FIG. 2, the four-way valve 6 is in the heating operation state, and the refrigerant discharged from the compressor 5 flows through the four-way valve 6 to the indoor heat exchanger 2 and radiates heat, and then returns to the outdoor unit 4. come.

  Furthermore, the outdoor unit 4 is provided with the other heat source utilization heat exchanger 9 and the second expansion valve 11 which is a second adjusting valve, in order to use cold heat or heat obtained from a heat source other than the outside air. In the heat source utilization heat exchanger 9, the brine which is a heat medium is sent to the underground heat source 18 by the pump 17, and the geothermal heat is recovered and carried.

  The control device 21 controls the switching means in accordance with the operating conditions such as the output of the outside air temperature sensor 16 and the heat medium temperature sensor 19 and the rotational speed of the compressor 5, and the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9. In a suitable connection according to the driving situation.

  Therefore, the air conditioner of the present invention can effectively utilize other heat sources, so it can reduce power consumption and provide an apparatus excellent in energy saving performance.

  In the air conditioner according to the second embodiment, the switching means is the first heat exchange valve 12 which is a first control valve disposed in the gas side pipe of the outdoor heat exchanger 7 and which opens and closes, and heat from other heat sources. The other heat source heat exchange on-off valve 13 which is a second control valve disposed on the high enthalpy side of the exchanger 9 for opening and closing, between the outdoor heat exchanger 7 and the external heat exchange on-off valve 12, and other heat source utilization heat exchange The gas-side low enthalpy-side connecting pipe 23 connecting the valve 9 and the second expansion valve 11, and the gas liquid on-off valve 22 which is a third control valve disposed in the gas-side low enthalpy-side connecting pipe 23 for opening and closing It is configured.

  The first expansion valve 10, the second expansion valve 11, the external heat exchange valve 12, the other heat source heat exchange valve 13, and the gas liquid on-off valve 22 are controlled by the control device 21, and the outdoor heat exchanger 7 and other heat sources are used. The use state of the heat exchanger 9 is set optimally.

  In the second embodiment, opening and closing of the first expansion valve 10, the second expansion valve 11, the external heat exchange valve 12, the other heat source heat exchange valve 13, and the gas liquid on-off valve 22 are performed by the heat medium temperature sensor 19. According to the difference ΔT between the output value Tt and the output value Ta of the outside air temperature sensor 16, it operates as in (Table 3) and (Table 4), and the use state of the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 Set the best.

  Table 3 shows the opening and closing of each valve during heating operation and Table 4 during cooling operation.

  In Table 3, the second heating threshold ΔTh2 uses the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 in parallel, or arranges the other heat source utilization heat exchanger 9 in series on the gas side The second cooling threshold ΔTc2 in (Table 4) indicates whether the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 are used in parallel or the other heat source utilization heat exchanger 9 Is a threshold value for determining whether to be disposed in series on the gas side.

  The determination conditions in the case of using the outdoor heat exchanger 7 and the other heat source utilizing heat exchanger 9 alone, such as ΔTc1, ΔTc4, ΔTh1 and ΔTh4, are the same as in the first embodiment.

  First, in the case of heating operation, in the case of ΔT <ΔTh1, the first expansion valve 10 and the external heat exchange on-off valve 12 are opened, and the second expansion valve 11, other heat source heat exchange on-off valve 13, gas liquid on-off The valve 22 is closed. The first expansion valve 10 is adjusted to an opening degree suitable for depressurizing the refrigerant. As a result, the refrigerant leaving the indoor heat exchanger 2 is reduced in pressure by the first expansion valve 10, and then flows to the outdoor heat exchanger 7 and does not flow to the other heat source utilization heat exchanger 9.

  That is, in the heating operation, when the brine temperature Tt obtained from the underground heat source 18 is smaller than the evaporation temperature of the refrigerant, the outdoor heat exchanger 7 is used alone.

  The difference between the brine temperature Tt and the evaporation temperature of the refrigerant increases from that state, and when ΔT becomes ΔTh1 or more, the refrigerant can be overheated even if it is disposed downstream of the outdoor heat exchanger 7.

  In general, the outdoor heat exchanger 7 is designed such that the gas side has multiple paths from the viewpoint of performance improvement. In a state where the required capacity is large, the number of rotations of the compressor 5 is high, and the amount of refrigerant circulation is large, it is easy to balance each path, but in the state where the number of rotations of the compressor 5 is low and the amount of refrigerant circulation is small It becomes difficult to balance each path under the influence of gravity.

  In order to optimize the performance of the compressor 5, it is necessary to adjust the dryness of the suction refrigerant appropriately. However, if the dryness of the suction refrigerant is adjusted appropriately in a state where the path balance is poor, the path of poor performance Since the throttling is set in accordance with the above, a path with good performance can not exhibit its original performance, and the performance of the outdoor heat exchanger 7 as a whole will deteriorate.

  Therefore, when the brine temperature Tt becomes higher than the evaporation temperature of the refrigerant, the other heat source utilization heat exchanger 9 is disposed downstream of the outdoor heat exchanger 7, and the other heat source utilization heat exchanger 9 dries the intake refrigerant. If control is performed to adjust the condition appropriately, the outdoor heat exchanger 7 can be fully utilized, and the operation performance of the air conditioner is improved.

  That is, in the case of ΔTh1 ≦ ΔT <ΔTh2, the first expansion valve 10, the other heat source heat exchange valve 13, and the gas liquid on-off valve 22 are opened, and the second expansion valve 11 and the external heat exchange valve 12 are closed. It will be in the state. The first expansion valve 10 is adjusted to an opening degree suitable for depressurizing the refrigerant. As a result, the refrigerant leaving the indoor heat exchanger 2 is reduced in pressure by the first expansion valve 10 and then flows through the outdoor heat exchanger 7 and then flows into the other heat source utilization heat exchanger 9.

  In this arrangement, even if the capacity ratio of the other heat source utilization heat exchanger 9 is small, a great effect can be obtained.

When ΔT is further increased to become ΔTh2 or more, when the other heat source utilization heat exchanger 9 comes to have a large capacity, the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 are used in parallel, and the evaporation temperature is increased. It is effective to raise the

  That is, in the case of ΔTh2 ≦ ΔT <ΔTh4, the first expansion valve 10, the second expansion valve 11, the external heat exchange valve 12, the other heat source heat exchange valve 13 are opened, and the gas liquid on-off valve 22 is closed. It will be in the state. The first expansion valve 10 and the second expansion valve 11 are adjusted to an opening degree appropriate for reducing the pressure of the refrigerant passing therethrough. As a result, the refrigerant leaving the indoor heat exchanger 2 is reduced in pressure by the first expansion valve 10, and then flows into the outdoor heat exchanger 7, and after being reduced in pressure by the first expansion valve 10, other heat sources are used It flows in parallel with the flow flowing into the heat exchanger 9.

  Furthermore, when ΔT becomes large and becomes ΔTh 4 or more, the capacity of the other heat source utilization heat exchanger 9 becomes larger, and it becomes desirable to use only the other heat source utilization heat exchanger 9.

  That is, in the case of ΔTh4 ≦ ΔT, the second expansion valve 11 and the external heat exchange valve 12 are opened, and the first expansion valve 10, the other heat source heat exchange valve 13, and the gas liquid on-off valve 22 are closed. Do. The second expansion valve 11 is adjusted to an opening degree suitable for reducing the pressure of the refrigerant. As a result, the refrigerant leaving the indoor heat exchanger 2 is reduced in pressure by the second expansion valve 11, and then flows to the other heat source utilization heat exchanger 9 and does not flow to the outdoor heat exchanger 7.

  As described above, in the second embodiment, as shown in (Table 3), when ΔT is not less than ΔTh1 and less than ΔTh2, the gas liquid on-off valve 22 and the other heat source heat exchange on-off valve 13 are opened and the second expansion is performed. The valve 11 and the external heat exchange on-off valve 12 are closed, and the other heat source utilization heat exchanger 9 is connected in series so as to be downstream of the outdoor heat exchanger 7. When ΔT is equal to or larger than ΔTh2 and smaller than ΔTh4, the gas liquid on-off valve 22 is closed, and the outdoor heat exchanger 7 parallel and the other heat source utilization heat exchanger 9 are connected in parallel. In the case of ΔTh4 or more, the external heat exchange valve 12, the first expansion valve 10, and the gas liquid on-off valve 22 are closed, and only the other heat source utilization heat exchanger 9 is used.

  In the cooling operation (Table 4), when ΔTc2 or more and less than ΔTc1, the gas liquid on-off valve 22 and the other heat source heat exchange on-off valve 13 are opened, and the second expansion valve 11 and the external heat exchange on-off valve 12 It closes and it connects in series so that the other-heat-source utilization heat exchanger 9 may become an upstream of the outdoor heat exchanger 7. FIG. The first expansion valve 10 is adjusted to an opening degree suitable for depressurizing the refrigerant. At this time, the other heat source utilizing heat exchanger 9 is used to dissipate heat in the overheated region of the refrigerant.

  When ΔT is more than ΔTc4 and less than ΔTc2, open the external heat exchange valve 12 and the other heat source heat exchange valve 13, close the gas liquid on-off valve 22, and connect the outdoor heat exchanger 7 parallel and the other heat source utilization heat exchanger Connect in parallel. The first expansion valve 10 and the second expansion valve 11 adjust the opening degree appropriate for reducing the pressure of the refrigerant passing therethrough.

  When ΔT is less than ΔTc4, the other heat source heat exchange valve 13 is opened, the first expansion valve 10, the external heat exchange valve 12, the gas liquid on-off valve 22 are closed, and the second expansion valve 11 is used to depressurize the refrigerant. Adjust to an appropriate degree of opening, and use only the other heat source utilization heat exchanger 9.

  The difference between the first embodiment and the second embodiment is that the positional relationship when the outdoor heat exchanger 7 and the other heat source utilizing heat exchanger 9 are connected in series is reversed. In Embodiment 1, when the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 are in series, the other heat source utilization heat exchanger 9 is on the liquid side, and the other heat source utilization heat exchanger 9 is downstream in the cooling operation. In the heating operation, the other heat source utilization heat exchanger 9 is upstream. On the other hand, in the second embodiment, when the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 are in series, the other heat source utilization heat exchanger 9 is on the gas side, and the other heat source utilization heat exchanger in the cooling operation. In the heating operation, the other heat source utilization heat exchanger 9 is downstream.

At that time, while the effect of the series arrangement at the time of the cooling operation is large in the first embodiment, the effect of the series arrangement at the time of the heating operation is large in the second embodiment. Since the configuration of the cycle is exactly the same during other operation, the same applies to the effect.

  In the second embodiment, the switching means is disposed on the gas side pipe of the outdoor heat exchanger 7 and performs opening and closing, and is disposed on the high enthalpy side of the other heat source utilization heat exchanger 9 and opened and closed. Other heat source heat exchange on-off valve 13 performing the heat exchange between the outdoor heat exchanger 7 and the external heat exchange on-off valve 12 and between the other heat source utilization heat exchanger 9 and the second expansion valve 11 on the gas side low enthalpy side It is comprised by the gas liquid on-off valve 22 arrange | positioned in the connection piping 23, and opening and closing. Either the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 are used alone or in parallel by this switching means, or the other heat source utilization heat exchanger 9 is connected in series to the gas side of the outdoor heat exchanger 7 You can choose to be placed in

  And a big effect is exhibited especially at the time of heating operation, power consumption of an air conditioner of the present invention can be reduced, and a device excellent in energy saving performance can be provided.

  Further, in the second embodiment, by performing control according to (Table 3) and (Table 4), it is possible to use a heat source suitable for the corresponding operating condition, and appropriately operate the device excellent in energy saving property.

  In the air conditioner of the second embodiment, ground heat is used as another heat source, but river water, solar heat, thermal storage such as snow room, exhaust heat of a refrigerator or heat pump, etc. I do not mind. Further, the refrigerant sealed in the refrigeration cycle circuit can obtain an effect regardless of the type.

Third Embodiment
FIG. 3 shows a configuration diagram of an air conditioner according to Embodiment 3 of the present invention. Note that FIG. 3 shows the four-way valve 6 in the cooling operation mode.

  The third embodiment, as shown in FIG. 3, has the configurations of both the first embodiment and the second embodiment.

  In the air conditioner according to the third embodiment, the switching means is a first control valve disposed on the gas side piping of the outdoor heat exchanger 7 and performing opening and closing. The other heat source heat exchange on-off valve 13 which is a second control valve disposed on the high enthalpy side of 9 and opens and closes, between the outdoor heat exchanger 7 and the first expansion valve 10, and the other heat source utilization heat exchanger 9 A liquid gas on-off valve 14 which is a fourth control valve disposed on the liquid side high enthalpy side connecting pipe 20 connecting between the other heat source heat exchange on-off valves 13 and the liquid side high enthalpy side connecting pipe 20 for opening and closing Gas side low enthalpy side connection piping 23 connecting between the heat exchanger 7 and the external heat exchange on-off valve 12 and between the other heat source utilization heat exchanger 9 and the second expansion valve 11, and gas side low enthalpy side connection piping Gas liquid on-off, which is a fourth control valve arranged at 23 for opening and closing It is composed of 22.

  The first expansion valve 10, the second expansion valve 11, the external heat exchange valve 12, the other heat source heat exchange valve 13, the liquid gas on-off valve 14 and the gas liquid on-off valve 22 are controlled by the control device 24 to perform outdoor heat exchange The use condition of the heat exchanger 7 and the other heat source utilization heat exchanger 9 is set optimally.

  In the third embodiment, as in the first and second embodiments, the first expansion valve 10, the second expansion valve 11, the external heat exchange valve 12, the other heat source heat exchange valve 13, the liquid gas The opening and closing of the on-off valve 14 and the gas liquid on-off valve 22 are as shown in Table 5 and Table 6 according to the difference ΔT between the output value Tt of the heat medium temperature sensor 19 and the output value Ta of the outside air temperature sensor 16. It operates and the use condition of the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 is set optimally.

  Conditions such as ΔTc 1, ΔTc 2, ΔTc 3, ΔTc 4, ΔTh 1, ΔTh 2, ΔTh 3, ΔTh 4 are the same as in the first and second embodiments.

  In the third embodiment, when the outdoor heat exchanger 7 and the other heat source utilization heat exchanger 9 are in series, the other heat source utilization heat exchanger 9 is also upstream and downstream with respect to the outdoor heat exchanger 7 (gas Since the arrangement can be made on the side and the liquid side, a great arrangement can be realized whether in the cooling operation or the heating operation.

  As described above, the air conditioner according to the present invention appropriately and effectively uses a heat source different from the outside air to provide an efficient device, and the technology is not limited to the air conditioner, and it is a separate It can be widely applied to type showcases, refrigerators, etc., and brings about an effect.

DESCRIPTION OF SYMBOLS 1 indoor unit 2 indoor heat exchanger 3 indoor blower 4 outdoor unit 5 compressor 6 four-way valve 7 outdoor heat exchanger 8 outdoor fan 9 other heat source utilization heat exchanger 10 1st expansion valve 11 2nd expansion valve 12 outside heat exchange opening and closing Valve 13 Other heat source heat exchange on-off valve 14 Liquid gas on-off valve 15, 21, 24 Control device 16 Outside air temperature sensor 17 Pump 18 Ground heat source 19 Heat medium temperature sensor 20 Liquid side high enthalpy side connection piping 22 Gas liquid on-off valve 23 Gas side low enthalpy side connection piping

Claims (8)

A compressor for compressing a refrigerant, an outdoor heat exchanger for exchanging heat with the outside air, a first adjusting valve connected to the low enthalpy side of the outdoor heat exchanger, cold heat obtained from a heat source other than the outside air The connection relationship between the other heat source utilization heat exchanger that utilizes heat, the second adjustment valve connected to the low enthalpy side of the other heat source utilization heat exchanger, the outdoor heat exchanger, and the other heat source utilization heat exchanger Switching means for switching the temperature, an indoor heat exchanger for exchanging heat with indoor air, an outside air temperature detecting means for detecting the temperature of the outside air, and a heat medium temperature detecting means for detecting the temperature of the heat medium conveyed from the heat source And a control unit that controls the switching unit according to at least one of the output of the outside air temperature detection unit and the output of the heat medium temperature detection unit, and a connection relationship in which the outdoor heat exchanger is used alone And the above A connection relationship in which an external heat exchanger and the other heat source utilization heat exchanger are connected in parallel and operated, a connection relationship in which the outdoor heat exchanger and the other heat source utilization heat exchanger are connected in series and operated, An air conditioner characterized in that it is possible to switch the connection relationship between the outdoor heat exchanger and the other heat source utilization heat exchanger, including a connection relationship using the other heat source utilization heat exchanger as a single body. It is a pipe connected to the first control valve, and a pipe on the opposite side to the outdoor heat exchanger and a pipe connected to the second control valve, on the opposite side to the other heat source utilization heat exchanger The piping joins together and is connected to the indoor heat exchanger,
The gas side piping of the outdoor heat exchanger and the high enthalpy side piping of the other heat source utilization heat exchanger join together and are connected to the discharge port or suction port of the compressor,
As the switching means, a first control valve disposed in the gas side pipe of the outdoor heat exchanger for opening and closing, and a second control valve disposed in the high enthalpy side pipe of the other heat source utilization heat exchanger for opening and closing A gas side low enthalpy side connecting pipe connecting between the outdoor heat exchanger and the first control valve and between the other heat source utilizing heat exchanger and the second control valve; and the gas side low enthalpy side Equipped with a third control valve located in the connection piping and opening and closing,
The operation of the first control valve, the second control valve, the first control valve, the second control valve, and the third control valve are controlled by the control means. Air conditioner. It is a pipe connected to the first control valve, and a pipe on the opposite side to the outdoor heat exchanger and a pipe connected to the second control valve, on the opposite side to the other heat source utilization heat exchanger The piping joins together and is connected to the indoor heat exchanger,
The gas side piping of the outdoor heat exchanger and the high enthalpy side piping of the other heat source utilization heat exchanger join together and are connected to the discharge port or suction port of the compressor,
As the switching means, a first control valve disposed in the gas side pipe of the outdoor heat exchanger for opening and closing, and a second control valve disposed in the high enthalpy side pipe of the other heat source utilization heat exchanger for opening and closing A liquid side high enthalpy side connecting pipe connecting between the outdoor heat exchanger and the first control valve and between the other heat source utilizing heat exchanger and the second control valve; and the liquid side high enthalpy side It has a fourth control valve that is arranged in the connection piping and that opens and closes,
The operation of the first control valve, the second control valve, the first control valve, the second control valve, and the fourth control valve are controlled by the control means. Air conditioner. If the difference value obtained by subtracting the output value of the outside air temperature detection means from the output value of the heat medium temperature detection means is greater than the first cooling threshold value during cooling operation, the first value for heating operation When it is smaller than the heating threshold value, the first control valve is opened, the second control valve or the second adjustment valve is closed, and the third control valve or the fourth control valve is closed. The air conditioning according to claim 2 or 3, wherein the first adjustment valve is adjusted to operate using only the outdoor heat exchanger without using the other heat source utilization heat exchanger. Machine. Heating is performed when the difference value obtained by subtracting the output value of the outside air temperature detection means from the output value of the heat medium temperature detection means is greater than or equal to the first cooling threshold and greater than the second cooling threshold in the case of cooling operation If the operation is the first heating threshold or more and smaller than the second heating threshold, the second control valve and the third control valve are opened, and the first control valve and the second adjustment valve are opened. 3. The air according to claim 2, characterized in that the first control valve is adjusted, and the other heat source utilization heat exchanger is connected in series to the gas side of the outdoor heat exchanger to operate. Harmonizer. If the difference value obtained by subtracting the output value of the outside air temperature detection means from the output value of the heat medium temperature detection means is third during a cooling operation or less than the first cooling threshold or the second cooling threshold If it is larger than the cooling threshold or the fourth cooling threshold, if it is heating operation, it is the first heating threshold or the second heating threshold or more and smaller than the third heating threshold or the fourth heating threshold. Opening the first control valve and the second control valve, closing the third control valve or the fourth control valve, and adjusting the first control valve and the second control valve; The air conditioner according to claim 2 or 3, wherein the outdoor heat exchanger and the other heat source utilization heat exchanger are connected in parallel and operated. When the difference value obtained by subtracting the output value of the outside air temperature detection means from the output value of the heat medium temperature detection means is smaller than the third cooling threshold value and larger than the fourth cooling threshold value during cooling operation When the heating operation is performed, the first control valve and the fourth control valve are opened when the temperature is equal to or higher than the third heating threshold and smaller than the fourth heating threshold, and the second control valve and the second control valve are The first adjustment valve is closed, the second adjustment valve is adjusted, and the other heat source utilization heat exchanger is connected in series to the liquid side of the outdoor heat exchanger and operated. The air conditioner according to Item 3. If the difference value obtained by subtracting the output value of the outside air temperature detection means from the output value of the heat medium temperature detection means is equal to or less than the fourth cooling threshold during cooling operation, the difference is the heating operation When the heating threshold value is 4 or more, the first control valve or the first control valve is closed, the second control valve is opened, and the third control valve or the fourth control valve is closed, The air conditioner according to claim 2 or 3, wherein a second control valve is adjusted, and the outdoor heat exchanger is not used and operated using only the other heat source utilization heat exchanger. .