JPH11182972A - Engine waste heat recovery unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste heat recovery unit for an engine drive type heat pump with put regard to the temperature and pressure of the refrigerant upstream of an engine waste heat recovery unit and upstream of an expansion valve, in case that there is necessity to supply a room with large energy not only from an indoor machine but also from a floor heater at low temperature of outside, air, in a heat pump device capable of floor heating. SOLUTION: There are a refrigerant inlet 600c where the refrigerant at high temperature and high pressure upstream of an indoor heat exchanger is led during heating operation of a compressor of engine drive, a refrigerant heat radiative pipe for floor heating being a refrigerant heat radiator where this refrigerant passes, a refrigerant outlet 600d after passage of this heat radiator, a cooling water inlet 601c where cooling water having absorbed the waste heat of the engine is introduced, a cooling water heat radiative pipe for floor heating where this cooling water passes, a cooling water outlet 601d, a heat carrying liquid inlet 600a, each heat receiver which transmits the heat from each heat radiator for refrigerant and cooling water, and a carrier liquid outlet 601d to heat radiation part for utilization of waste heat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine exhaust heat recovery unit used for a heat pump device.

[0002]

2. Description of the Related Art In a heat pump device, for example, during heating,
There is a type in which a refrigerant pressurized by an engine or a compressor driven by an electric motor and heated to a high temperature and a high pressure is circulated through an indoor unit for heating. However, a large amount of energy consumption is required to make a room person feel sufficiently warm by heating only the indoor unit. For this reason, it has been considered that a floor heating panel is arranged on the floor in the room where the indoor unit is arranged, and heating is performed by both the indoor unit and the floor heating panel.

[0003] For this reason, the present applicant has filed Japanese Patent Application No. Hei 9-1894.
No. 47, "In the heating operation by the compressor, the refrigerant circuit is circulated from the compressor to the indoor heat exchanger, the expansion valve, the outdoor heat exchanger and the compressor in order, and the compressor and the outdoor heat exchanger are built in. Used in a heat pump device comprising an outdoor unit to be heated and an indoor unit having an indoor heat exchanger built therein. During heating, a refrigerant inlet through which a high-pressure high-temperature refrigerant upstream of the indoor heat exchanger is guided, and a passage of the high-temperature high-pressure refrigerant Refrigerant radiator,
A cooling water outlet from a floor heating panel disposed in a room in which the indoor heat exchanger is disposed, and a cooling outlet for circulating the cooling water, while arranging a refrigerant outlet serving as an outlet of the refrigerant after passing through the refrigerant radiator. A floor heating unit, comprising a water pump, a heat receiver for transmitting heat from the refrigerant radiator to the cooling water, and a cooling water outlet that is an outlet for the cooling water to the floor heating panel. ] Was suggested.

[0004] According to this, the refrigerant whose temperature and pressure have been increased by the compressor is branched, one of the refrigerant is circulated to the indoor heat exchanger of the indoor unit to raise the temperature of the indoor air, and the other is circulated to the engine exhaust heat recovery unit. The floor heating panel can be heated via the heat transfer liquid to raise the floor temperature. The person in the room is heated by both the indoor air and the floor, and the engine exhaust heat recovery unit is inserted in the middle of the refrigerant pipe between the outdoor unit and the indoor unit, and between the floor heating unit and the floor heating panel. By simply providing a pipe for circulating cooling water, the heat pump device can easily recover engine exhaust heat without the need to remodel outdoor units or indoor units.

Further, in Japanese Patent Application No. Hei 9-189449, the compressor is driven by the engine, and the engine exhaust heat that would normally be discharged from the engine into the outside air is recovered by the refrigerant during heating. As a result, the engine exhaust heat is used not only for heating room air but also for floor heating.

[0006]

However, all of the exhaust heat of the engine is once exchanged with the refrigerant, and further exchanged with the heat carrier liquid. Therefore, when it is necessary to supply a large amount of energy to the room not only from the indoor unit but also from the engine exhaust heat recovery device because the outside air temperature is particularly low, the refrigerant upstream of the floor heating unit and the upstream of the expansion valve will have the engine output and Since both the engine exhaust heat is obtained and the temperature becomes extremely high and the pressure becomes high, there is a problem that heat loss from the refrigerant pipe tends to increase, and it is necessary to increase the pressure resistance of the refrigerant pipe, resulting in an increase in cost.

Further, it is conceivable to supply a part of the exhaust heat of the engine and the heat of condensation of the refrigerant, which has been heated to a high temperature and a high pressure by the compressor, to a radiator for hot water supply and drying. In this case, there is a similar problem. That is, when supplying a part of the engine exhaust heat and the condensed heat of the refrigerant heated to a high temperature and a high pressure by the compressor to an engine exhaust heat utilization device for floor heating, hot water supply, drying, etc., a part of the engine exhaust heat and Similarly, in the engine exhaust heat recovery unit that receives the heat of condensation of the refrigerant, there may be a problem of heat loss and high cost in the refrigerant pipe upstream of the engine exhaust heat recovery unit and upstream of the expansion valve.

The present invention has been made in view of the above-mentioned circumstances, and in addition to making it possible to easily perform a remodeling work when the heat pump device can recover the exhaust heat of the engine, since the outside air temperature is particularly low, only the indoor unit can be used. For engines driven heat pumps that do not excessively increase the temperature and pressure of refrigerant upstream of the engine exhaust heat recovery unit and upstream of the expansion valve when it is necessary to supply large energy from the engine exhaust heat recovery device to the room. It is an object of the present invention to provide an engine heat recovery unit.

[0009]

Means for Solving the Problems In order to solve the above problems and achieve the object, the present invention has the following constitution.

According to the first aspect of the present invention, there is provided a refrigerant circuit for circulating refrigerant from a compressor to an indoor heat exchanger, an expansion valve, an outdoor heat exchanger and a compressor during a heating operation by an engine driven compressor, Used in an engine-driven heat pump device comprising at least an outdoor unit having a built-in engine, a compressor and an outdoor heat exchanger, and an indoor unit having a built-in indoor heat exchanger. A refrigerant inlet through which the high-pressure refrigerant is introduced, a refrigerant radiator through which the high-temperature and high-pressure refrigerant passes, a refrigerant outlet serving as an outlet of the refrigerant after passing through the refrigerant radiator, and cooling water that absorbs engine exhaust heat are guided. An engine cooling water inlet, an engine cooling water radiator through which the cooling water passes, an engine cooling water outlet serving as a cooling water outlet after passing through the engine cooling water radiator, and a heat transfer liquid inlet of the heat transfer liquid. A refrigerant-side heat receiver and an engine-cooling-water-side heat receiver for transmitting heat from the refrigerant radiator and heat from the engine-cooling-water radiator to a heat-transporting liquid, respectively, and heat transfer to a heat-dissipating portion for utilizing engine exhaust heat An exhaust heat recovery unit for an engine, wherein a heat transport liquid outlet for the liquid is disposed. ].

According to the first aspect of the present invention, the engine exhaust heat recovery unit is formed independently of the outdoor unit.
An engine cooling water outlet and an engine cooling water inlet for circulating the engine cooling water that has recovered the engine exhaust heat to a hot water boiler outside the outdoor unit, and a refrigerant outlet and a refrigerant return port for circulating the refrigerant to the indoor unit. If there are multiple sets, stop circulation to the hot water boiler and pipe the engine cooling water directly to the engine exhaust heat recovery unit, or branch off from the middle of the circulation path to the hot water boiler to exhaust the engine. While the refrigerant is circulated to the heat recovery unit, the refrigerant is circulated to the engine exhaust heat recovery unit using one of a plurality of refrigerant outlets and a refrigerant return port, or the refrigerant is circulated to the indoor unit. By simply diverging from the road and circulating to the engine exhaust heat recovery unit, additional installation of the engine exhaust heat recovery unit can be easily performed. In addition, in the case of an outdoor unit having only one set of the refrigerant outlet and the refrigerant return port and having no engine cooling water inlet and an engine cooling water inlet for circulation to an external hot water boiler, the outdoor unit has an engine cooling water outlet. The engine cooling water inlet, the refrigerant outlet, the refrigerant inlet, and the piping for the respective outdoor units are merely modified, and there is no need to arrange a heat exchanger in the outdoor units. Further, the pressure and temperature of the refrigerant on the high pressure side of the compressor during heating can be reduced by the amount of energy supplied to the engine exhaust heat recovery unit via the refrigerant by the amount of engine exhaust heat sent to the engine exhaust heat recovery unit.

According to a second aspect of the present invention, there is provided an engine cooling water which becomes an engine cooling water radiator and an engine cooling water side heat receiver by integrating a heat radiating wall in contact with the engine cooling water and a heat receiving wall in contact with the heat carrier liquid. A heat exchanger for cooling, a heat radiating wall in contact with the refrigerant, and a heat receiving wall in contact with the heat transfer liquid, and a refrigerant heat exchanger serving as a refrigerant radiator / refrigerant-side heat receiver arranged. Item 2. An engine exhaust heat recovery unit according to Item 1. ].

According to the second aspect of the invention, in addition to the function and effect of the first aspect, there is no need to dispose another liquid for transporting heat between the heat radiating wall and the heat receiving wall. The heat transfer from the heat transfer liquid to the heat transfer liquid and the heat transfer from the refrigerant to the heat transfer liquid can be achieved by simple structures.

According to a third aspect of the present invention, an engine cooling water and heat are provided inside a double pipe comprising an outer pipe and an inner pipe which is disposed inside the outer pipe and serves as the heat dissipation wall and the heat receiving wall. The engine cooling water side double pipe heat exchanger is configured to flow one of the carrier liquids and flow the other between the inner pipe and the outer pipe, and a refrigerant is provided inside the inner pipe of the double pipe. 2. The engine exhaust heat according to claim 1, wherein the refrigerant-side double-pipe heat exchanger is configured to flow one of the heat transfer liquids and flow the other between the inner pipe and the outer pipe. 3. Collection unit. ].

According to the third aspect of the present invention, in addition to the function and effect of the first aspect, there is no need to arrange another liquid for transporting heat between the heat radiating wall and the heat receiving wall. The heat transfer from the heat transfer liquid to the heat transfer liquid and the heat transfer from the refrigerant to the heat transfer liquid can be achieved by simple structures.

According to a fourth aspect of the present invention, there is provided a method wherein one of the engine cooling water-side heat receiver and the refrigerant heat exchanger is placed one above the other and the other is placed below the heat exchanger. The engine exhaust heat recovery unit according to any one of claims 1 to 3. ].

According to the fourth aspect of the present invention, in addition to the effects of the first aspect, the floor area of the engine exhaust heat recovery unit can be reduced, and the engine exhaust heat recovery can be performed in a narrow space with a margin in the vertical direction. Units can be placed.

According to a fifth aspect of the present invention, there is provided an engine cooling water-side double-tube heat exchanger and a refrigerant-side double-tube heat exchanger each having a double tube wound in a coil shape. The lower end of the heat transfer liquid passage of the upper double-tube receiver and the upper end of the heat transfer liquid passage of the lower double-tube heat receiver are stacked with the other side down. The engine exhaust heat recovery unit according to claim 3, wherein the units are connected by a pipe. ].

According to the fifth aspect of the invention, in addition to the function and effect of the third aspect, the length of the pipe connecting the heat transfer liquid passages of the double-tube heat receiver to each other can be shortened.

According to a sixth aspect of the present invention, there is provided a heat exchanger comprising: a refrigerant-side double-tube heat exchanger on the upper side; an engine cooling-water-side double-tube heat exchanger on the lower side; The upper end of the transfer liquid passage is the heat transfer liquid inlet from the floor heating panel, and the lower end of the heat transfer liquid passage of the lower double tube receiver is the heat transfer liquid outlet from the floor heating panel. The engine according to claim 5, wherein engine cooling water having a temperature higher than a refrigerant temperature guided to the refrigerant side double pipe heat exchanger is guided to the engine cooling water side double pipe heat exchanger. Exhaust heat recovery unit. ].

According to the sixth aspect of the invention, in addition to the effect of the fifth aspect, first, heat exchange between the low-temperature refrigerant and the heat carrier liquid is performed, and then heat exchange with the high-temperature engine cooling water. In addition, since it is possible to apply heat to the heat transfer liquid by both the refrigerant-side double pipe heat exchanger and the engine cooling water-side double pipe heat exchanger, the heat transfer liquid can be efficiently heated.

According to a seventh aspect of the present invention, the upper end of the refrigerant passage of the refrigerant-side double-pipe heat exchanger is used as a refrigerant outlet to the expansion valve, and the lower end of the refrigerant passage is connected to the refrigerant from the compressor. The upper end of the engine cooling water passage of the engine cooling water side double pipe heat exchanger serves as the engine cooling water outlet to the engine, and the lower end of the engine cooling water passage serves as the engine cooling water inlet from the engine. The engine exhaust heat recovery unit according to claim 6, wherein: ].

According to the seventh aspect of the invention, in addition to the function and effect of the sixth aspect, first, heat exchange between the low-temperature refrigerant and the heat carrier liquid is performed, and then heat exchange with the high-temperature engine cooling water. Therefore, the heat transfer liquid can be more efficiently heated.

[0024] The eighth aspect of the present invention is that a refrigerant-side double-tube heat exchanger is disposed on the lower side and an engine cooling-water-side double-tube heat exchanger is disposed on the upper side. The lower end of the heat transfer liquid passage is used as the heat transfer liquid inlet from the engine exhaust heat radiator, and the upper end of the heat transfer liquid passage in the upper double tube heat receiver is connected to the engine waste heat radiator. Wherein the engine cooling water having a temperature higher than the refrigerant temperature guided to the refrigerant side double pipe heat exchanger is guided to the engine cooling water side double pipe heat exchanger. Item 6. An engine exhaust heat recovery unit according to Item 5. ].

According to the eighth aspect of the invention, in addition to the effect of the fifth aspect, first, the heat exchange between the low-temperature refrigerant and the heat carrier liquid is performed, and then the heat exchange is performed with the high-temperature engine cooling water. In addition, since it is possible to apply heat to the heat transfer liquid by both the refrigerant-side double pipe heat exchanger and the engine cooling water-side double pipe heat exchanger, the heat transfer liquid can be efficiently heated.

According to a ninth aspect of the present invention, there is provided a method as described above, wherein the lower end of the refrigerant passage of the refrigerant-side double-pipe heat exchanger is used as a refrigerant outlet to the expansion valve, and the upper end of the refrigerant passage is connected to the refrigerant from the compressor. The lower end of the engine cooling water passage of the engine cooling water double pipe heat exchanger is used as the engine cooling water outlet to the engine, and the upper end of the engine cooling water passage is connected to the engine cooling water inlet from the engine. The engine exhaust heat recovery unit according to claim 6, wherein: ].

According to the ninth aspect of the invention, in addition to the function and effect of the eighth aspect, first, heat exchange between the low-temperature refrigerant and the heat carrier liquid is performed, and then heat exchange with the high-temperature engine cooling water. Therefore, the heat transfer liquid can be more efficiently heated.

According to a tenth aspect of the present invention, there is provided a method according to the first aspect, wherein a throttle or a capillary for pressure drop is arranged in the middle of the refrigerant pipe between the refrigerant radiator and the refrigerant outlet. The engine exhaust heat recovery unit according to any one of the above. ].

According to the tenth aspect of the invention, in addition to the functions and effects corresponding to the respective aspects, a throttle or a capillary for reducing pressure is disposed in the engine exhaust heat recovery unit, so that the refrigerant return port and the compressor are provided. The engine exhaust heat recovery unit can be easily connected to an outdoor unit that does not have a pressure drop restrictor or a capillary tube in the refrigerant pipe between them.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an engine driven heat pump apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the overall configuration of an engine-driven heat pump device. The engine-driven heat pump device 1 includes an outdoor unit 2 and an indoor unit 522 shown in FIG. Engine 201 provided in outdoor unit 2
Is a water-cooled spark ignition type gas engine, which drives a refrigerant compressor 208 via a transmission 202. The transmission 202 includes an output shaft 203 of the engine 201 and the compressor 2.
08 pulleys 20 fixed to each of the input shafts 206
The belt 205 is stretched between 4,207. For the engine 201, the compressor 208
And a cooling water circuit 250 for cooling the engine 201 and recovering exhaust heat. The cooling water circuit 250 includes a cooling water jacket 263 for the engine 201 and a cooling water jacket 263. An exhaust heat exchanger 262 provided in the exhaust pipe is incorporated as a part for supplying exhaust heat to cooling water.

The refrigerant circuit 210 is a circuit for circulating refrigerant such as Freon by the compressor 208.
The oil separator 230 is connected to the oil separator 230 by a pipe 211, and the oil separator 230 and the four-way valve 232 are connected to the pipe 21.
2, a four-way valve 232 and a double-pipe heat exchanger 233, which is a heat exchanger mainly for radiating heat to the refrigerant during heating, are connected to the pipe 21.
3, the double-tube heat exchanger 233 is a water-refrigerant heat exchanger. The double-tube heat exchanger 233 and a plurality of outdoor heat exchangers 234 are connected by a pipe 214, The exchanger 234 and the distributor 236 are connected by a plurality of pipelines 215, and the pipeline 216 from the distributor 236 branches into branch pipelines 216a. The plurality of indoor heat exchangers 240 are connected to the branch line 216.
a, via an electronic expansion valve 238 arranged in each of the a, a pipe 217, the indoor heat exchanger 240 and the four-way valve 232 are collectively connected to the pipe 218 via a branch pipe 218a, and the four-way valve 232 The compressor 208 is connected via a line 219 via an accumulator 245.

In a pipe 219 between the accumulator 245 of the refrigerant circuit 210 and the compressor 208, oil separated from the refrigerant in the oil separator 230 is supplied to the compressor 20.
In order to return to 8, the oil return passage 231 extending from the oil separator 230 is connected via a capillary 270 in the middle. The outdoor heat exchanger 234 disposed between the pipe 214 and the pipe 215 is provided with an outdoor fan 235 for passing air through the outdoor heat exchanger 234.

An electronic expansion valve 238 is connected to the branch line 216a.
A strainer 291 is provided. The dryer 241 and the valve 290 are disposed in the pipe 216, and the pipe 218 is provided.
Are provided with a valve 292 and a strainer 293, respectively. Further, a pipeline 294 is connected to the pipeline 216, and a plurality of indoor heat exchangers are connected to the pipeline 294 and the pipeline 218 via the branch pipelines as described above.

A bypass refrigerant pipe 421 is connected between the pipe 214 and the pipe 216, and an electric bypass valve 422 and a check valve 423 are arranged in the bypass refrigerant pipe 421. Further, an electric open / close valve 424 and a refrigerant temperature sensor 425 are disposed in a conduit 216 between the dryer 241 and the distributor 236. Double tube heat exchanger 233 and a plurality of outdoor heat exchangers 23
An electric on-off valve 426 is arranged in the pipeline 214 between the four.

A flexible pipe 300 is disposed in the middle of the pipe 211, and a high-pressure side temperature sensor 303 for detecting the temperature of the refrigerant passing through the pipe 211, and a high-pressure side sensor between the compressor 208 and the electronic expansion valve 238. A high pressure side pressure sensor 301 for detecting the refrigerant pressure of the refrigerant circuit is provided. The high pressure side refrigerant circuit is
During cooling, the pipe 211, the oil separator 230, the pipe 212, the four-way valve 232, the pipe 213, the double pipe heat exchanger 2
33, a pipe 214, an outdoor heat exchanger 234, a pipe 215, and a pipe 216. During heating, the pipe 211, the oil separator 230, the pipe 212, the four-way valve 232 and the pipe 218, the indoor heat exchanger 240 , And a pipeline 217.

A compressor temperature sensor 306 is arranged in the compressor 208, and a flexible tube 300 is arranged in the middle of the pipe 219. Further, the compressor 2 is connected to the electronic expansion valve 238.
A low pressure side pressure sensor 302 for detecting the refrigerant pressure of the low pressure side refrigerant circuit until 08 is provided in the pipe 219. The low-pressure side refrigerant circuit includes a pipe 217 and an indoor heat exchanger 2 during cooling.
40, a pipeline 218, a four-way valve 232, and a pipeline 219 in which an accumulator 245 is arranged in the middle. When heating, the pipeline 216, the pipeline 215, the outdoor heat exchanger 234,
It comprises a pipe 214, a double pipe heat exchanger 233, a pipe 213, a four-way valve 232 and a pipe 219.

On the other hand, in the cooling water circuit 250, the exhaust heat exchanger 262 is connected to the outdoor water pump 261 by a pipe 251, and the exhaust heat exchanger 262 and the cooling water jacket 263 provided in the exhaust pipe of the engine 201 are connected. The cooling water jacket 26 is connected by a conduit 252 and a circulation passage 252a.
3 and the linear three-way valve 280 are connected to the circulation passage 252b and the pipe 25.
3, the linear three-way valve 280 and the outdoor radiator 265 are connected by a pipe 254, the outdoor radiator 265 and the outdoor water pump 261 are connected by a pipe 257, and the middle of the pipe 257 and the water tank 267 are connected by a pipe. 255
And the line 257 and the linear three-way valve 280
They are connected by a pipe 256 via a double pipe heat exchanger 233. A tank cap 406 with a relief function is connected to the water tank 267. In conduit 252,
A switching valve K is disposed, and the switching valve K is provided with a tank cap 4.
06 are connected by a conduit 259. The conduit 259 is used as a passage for venting air.

The pipeline 255 is used as a passage for supplying cooling water, and the pipeline 257 is used as a passage for circulating the cooling water from the outdoor radiator 265 to the water pump. The outdoor radiator 265 includes the outdoor radiator 2
Outdoor fan 266 for blowing air against
Is provided. In addition, the outdoor fans 235 and 266 may be integrally enlarged.

A liner three-way valve 280 is arranged in the line 253, and the line 256 and the line 25 are controlled by the liner three-way valve 280.
4 and the flow rate control of the cooling water is performed. In other words, the engine cooling water that has recovered the engine exhaust heat is converted into water that exchanges heat between the cooling water and the refrigerant in the refrigerant circuit 210.
It is configured to be branched and supplied to the double-pipe heat exchanger 233 which is a heat exchanger between refrigerants and the engine exhaust heat recovery unit 70.

The double-pipe heat exchanger 233 provided between the refrigerant circuit 210 and the cooling water circuit 250 mainly exchanges heat between the refrigerant flowing through both circuits and the cooling water during heating. An intake pipe 317 is connected to the engine 201, and an air cleaner 318 is disposed upstream of the intake pipe 317.
A mixer 3 for mixing gas fuel is provided downstream of the intake pipe 317.
19 and a throttle valve 320 downstream thereof. The opening and closing of the throttle valve 320 is controlled by a throttle valve opening control actuator 311 composed of a step motor. A gas discharge port is provided at the venturi portion of the mixer 319, and a fuel gas flow control valve 312, a pressure reducing valve 313, and two on-off valves 314 are provided on the discharge port.
And a gas supply pipe line 316 connected to a fuel gas supply source 315. Further, an exhaust pipe 323 is connected to the engine 201, and exhaust gas can be discharged to the atmosphere via an exhaust heat exchanger 262 provided in the middle of the exhaust pipe. The engine 201 is provided with an engine speed sensor 310 for detecting the engine speed.

In this embodiment, the circulation path S of the cooling water circulation system is connected to the cooling water jacket 26 of the engine 201.
3. Switching valve K, circulation passages 252a, 252 for communicating these
52b, an engine-side circulation half-way S1, an exhaust heat exchanger 262, a linear three-way valve 280, one of which is an outdoor radiator 265 and an engine cooling water-side radiating pipe 403 for recovering engine exhaust heat described below, and the other is a double pipe heat exchanger. 233, an outdoor water pump 261, conduits 252, 25 connecting these
3, 254, 256, 257, water pipes 402, 404, and a thermostatic circulation half-way S2. The engine-side circulation half-way S1 and the heat-radiation-side circulation half-way S2 form a circulation path when the engine is warmed up when the cooling water temperature exceeds a predetermined value. Cooling water jacket 263
A communication path 950 connecting the downstream connection point P1 and the upstream connection point P2 forms a bypass path, and forms a circulation path with the heat radiation side circulation half path S2 when the cooling water temperature is equal to or lower than a predetermined value.

In the accommodation room of the engine 201, an engine accommodation room temperature sensor 430 is arranged.
A cooling water temperature sensor 431 is disposed at 52b, and detects the outlet temperature of the cooling water jacket 263. Further, a cooling water temperature sensor 432 is disposed in the pipe 252, and the cooling water temperature sensor 432 detects the outlet temperature of the exhaust heat exchanger 262. Further, an outdoor air temperature sensor 439 is arranged in the outdoor unit 2.

An engine exhaust heat recovery unit 70 according to an embodiment of the present invention is disposed outside the outdoor unit 2 independently of the outdoor unit 2, and hot water is circulated and supplied from the engine exhaust heat recovery unit 70 and the engine exhaust heat recovery unit 70. An engine exhaust heat recovery and utilization device is configured by the floor heating panel 556 (engine exhaust heat utilization radiator) functioning as the exhaust heat utilization device. The indoor heat exchanger 240 of the indoor unit 522 disposed in each room is connected to the outdoor unit 2 via connection joints a1 to a8 on the outdoor unit side, and the engine exhaust heat recovery unit 70 is connected to the outdoor unit side. It is connected to the outdoor unit 2 via the joints a9 to a12.

The engine exhaust heat recovery unit 70 has connection joints b1 to b6 on the engine exhaust heat recovery unit side, and the connection joints b3 and b4 on the engine exhaust heat recovery unit side via branch pipes 216a and 218a. To the connection joints a10 and a9 on the outdoor unit side, and the connection joints b5 and b6 on the engine exhaust heat recovery unit side.
Are connected to connection joints a12, a11 on the outdoor unit side via water pipes 404, 402. An electronic expansion valve 23 for recovering engine exhaust heat is provided in a branch pipe line 216a of the outdoor unit 2.
8a is arranged and connected to the connection joint part a10 on the outdoor unit side via the strainer 291.

A thermostat 4 is connected to a pipe 254 between the linear three-way valve 280 of the outdoor unit 2 and the outdoor radiator 265.
00, and a packed valve 401 is provided in the middle of a pipe connecting the thermostat 400 and the connection joint part a11 on the outdoor unit side. A packed valve 405 is arranged in the middle of the pipe connecting the pipe 257 and the connection joint part a12 on the outdoor unit side. The packed valves 401 and 405 are manual open / close valves, and are fully closed when the engine exhaust heat recovery unit 70 is not used, and fully open when the engine exhaust heat recovery unit 70 is used. Alternatively, the following may be performed. Packed valve 40
1, 405 is an electronic open / close valve, and the packed valve 401 and the packed valve 405 are simultaneously opened when the floor heating operation unit 570b of the indoor remote controller 612 is ON even during heating or cooling.

The linear three-way valve 280 has a thermostat 4
00 F hot water flow I ₁ and the heating of, performing shunting the engine exhaust heat to the hot water flow I ₂ to the double-pipe heat exchanger 233 for collecting the refrigerant. The thermostat 400 divides the flow into the hot water flow I ₃ and the hot water flow I _{4 according} to the cooling water temperature immediately upstream.

In the engine exhaust heat recovery unit 70, an engine exhaust heat recovery heat exchange unit 71 and an engine exhaust heat utilizing heat transport liquid tank 410 are arranged. Between the connection joints b1 and b2 on the engine exhaust heat recovery unit side, the heat transfer liquid circulation pipes 411, 412, 4
16 is connected to the heat transfer liquid circulation pipe 4 utilizing the engine exhaust heat.
A heat transfer liquid pump 413 utilizing engine exhaust heat is disposed at 12. Heat exhaust pipe 414 connected to the heat transfer liquid circulation pipe 412 for heating, and the engine heat recovery pipe 4 connected to the heat transfer liquid circulation pipe 416 for heating.
Reference numeral 15 is incorporated in the heat exchange unit 71 for recovering engine exhaust heat.

The engine cooling water side radiating pipe 403 for recovering the engine exhaust heat is connected to the connection joints b5 and b6 on the engine exhaust heat recovery unit side, and the engine cooling water radiating pipe 418 for recovering the engine exhaust heat is connected to the engine exhaust heat recovering unit. The engine-side heat recovery pipe 403 and the engine exhaust-heat recovery refrigerant-side heat pipe 418 which are connected to the unit-side connection joints b3 and b4 are also built into the engine exhaust heat recovery heat exchange unit 71. ing.

The engine cooling water side radiating pipe 403 for recovering engine exhaust heat and the heat receiving pipe 415 for recovering engine exhaust heat are integrated to constitute a double-pipe heat exchanger. Similarly, the engine-side exhaust heat recovery refrigerant side heat radiating pipe 418 and the engine exhaust heat recovery heat receiving pipe 414 are integrated to constitute a double-pipe heat exchanger. The two double tube heat exchangers are connected to form a heat exchange unit 71 for recovering engine exhaust heat.
Is formed. In addition, you may make it comprise each plate heat exchanger instead of each double heat exchanger. A refrigerant liquid temperature sensor 419 for detecting the temperature of the refrigerant immediately downstream when the engine-side exhaust heat recovery refrigerant-side radiating pipe 418 is heated is provided.

FIG. 2 is a diagram showing the installation status of air conditioners in each room. For example, the engine exhaust heat recovery dedicated room 520A,
There are air conditioning target B room 520B, air conditioning target C room 520C, air conditioning target D room 520D, and air conditioning target E room 52OE. An indoor unit 522 without a built-in expansion valve is used for the air-conditioned B room 520B to the air-conditioned E room 520E.

No indoor unit is used in the floor heating dedicated room 520A.

Room B 520B to be air-conditioned and Room C 5 to be air-conditioned
The indoor heat exchanger 240, the blower fan 240a, and the indoor refrigerant temperature sensor 572 are built in the indoor unit 522 without a built-in expansion valve of 20C, and are connected to the refrigerant pipes 532, 533 via the refrigerant pipes 536, 537 and the branch unit 535. Connected, and refrigerant pipes 532, 533 are connected to refrigerant pipes 530, 531
Connected. The refrigerant pipes 530 and 531 are connected to the outdoor unit 2 via connection joints a1 and a2 on the outdoor unit side.

The branch unit 535 includes a refrigerant pipe 532.
The refrigerant pipe 536 branches to the air-conditioned B room 520B and the air-conditioned C room 520C side, the refrigerant pipe 537 branches from the refrigerant pipe 533 to the air-conditioned B room 520B and the air-conditioned C room 520C side, and the refrigerant pipe 536 Electronic expansion valve 238
b and a strainer 538 are arranged.

The air-conditioned D room 520D and the air-conditioned E room 5
An indoor heat exchanger 240, a blower fan 240a, and an indoor refrigerant liquid temperature sensor 572 are built in the indoor unit 522 without a built-in expansion valve of the 20E, and the connection joints a3, 3 on the outdoor unit side via refrigerant pipes 540, 541. a4 and a5, a6
And is connected to the outdoor unit 2 side.

Floor heating dedicated room 520A to air-conditioned E room 5
In 20E, an indoor remote controller 570, an indoor temperature sensor 571, and a floor temperature sensor 573 are arranged. Further, a floor heating panel (radiator using exhaust heat from the engine) 556 is arranged, and the heat transfer liquid pipe 550 using the engine exhaust heat through the electronic flow control valve 555 and the heat transport liquid pipes 552 and 553 using the engine exhaust heat. 551. The heat transfer liquid pipes 550 and 551 utilizing the exhaust heat of the engine are connected at the last end.

For example, in the room B 520B to be air-conditioned and the room C 520C to be air-conditioned, the indoor unit 52 without a built-in expansion valve is used.
In the case where an indoor unit with a built-in expansion valve is used instead of the second unit 2, the branch unit 535 is not used, and the refrigerant pipe 53 is not used.
6 and the refrigerant pipe 537 are connected to the refrigerant pipe 532, respectively. Each of the indoor units incorporating the expansion valve includes an internal pipe connected to the refrigerant pipe 536 and a refrigerant pipe 53 inside.
An electronic expansion valve is arranged in each of the internal pipes connected to. That is, the pipe 2 which is the internal pipe of the
Since the electronic expansion valve is not arranged in 94, it is possible to use an indoor unit incorporating an expansion valve.

FIG. 3 is a detailed piping diagram of the engine exhaust heat recovery unit. FIG. 3 is a diagram showing a heat transport liquid tank unit 4 utilizing engine exhaust heat of the engine exhaust heat recovery unit 70 in FIG.
10 is shown in more detail, and the air vent passages are also shown.

The heat carrier liquid tank unit 410 utilizing the exhaust heat of the engine comprises an air release tank 410 A and a reserve tank 4.
10B. In the air release tank 410A,
A conductor 701 is provided, and a pressure cap 700 is detachably provided on the conductor 701. The pressure of the air release tank 410A is set to a predetermined pressure or higher. A first heat transfer liquid air release passage 702 for releasing air to the conduction 701 is connected to the conductor 701, and the first heat transfer liquid air release passage 7
02 is connected to the heat carrier liquid drain passage 703. The heat transfer liquid drain passage 703 is connected to the heat transfer liquid circulation pipe 411 utilizing the engine exhaust heat, and is connected to the heat transfer liquid drain passage 703.
Is provided with a heat transfer liquid drain cock 703a.

The air vent tank 410A is provided with a second heat carrier liquid air vent passage 704 for bleeding air from the upper portion of the air vent tank. It is connected to the liquid supply passage 705. The heat transfer liquid supply passage 705 is connected to the first heat transfer liquid air release passage 702, and the heat transfer liquid is supplied to the air release tank 4.
When the inside of 10A becomes a negative pressure, it is supplied from the heat carrier liquid supply passage 705 through the heat carrier liquid air vent passage 702 and the conduction 701.

An external pressure introducing passage 706 is connected to the reserve tank 410B, and external pressure is introduced into the reserve tank 410B through the external pressure introducing passage 706. A heat transfer liquid supply cap 707 is provided in the reserve tank 410B, and the heat transfer liquid is supplied to the reserve tank 410B by opening the heat transfer liquid supply cap 707. The heat transfer liquid circulation pipe 412 using the engine exhaust heat uses the heat transfer liquid pump 413 that uses the engine exhaust heat as a boundary.
12a and a heat transfer liquid circulation pipe 412b on the side of the heat exchange unit for recovering engine exhaust heat.

The heat exchange unit 71 for recovering engine exhaust heat is provided with a refrigerant-side double-tube heat exchanger 600 in which an engine exhaust heat recovery refrigerant-side radiating pipe 418 and an engine exhaust heat recovery heat-receiving pipe 414 are integrated. Further, an engine cooling water side double pipe heat exchanger 601 in which the engine cooling water side heat radiation pipe 403 and the engine exhaust heat recovery heat receiving pipe 415 are integrated is provided.

In this embodiment, as shown in FIG. 3B, in the refrigerant side tube heat exchanger 600 composed of the outer tube 600e and the inner tube 600f, the outer tube 600e and the inner tube 600f
And the heat transfer liquid passes through the inside of the inner pipe 600f, so that the outer wall 600fl of the inner pipe 600f corresponds to the engine-side exhaust heat recovery refrigerant-side radiating pipe 418, and the inner pipe 600f
600fl is an engine exhaust heat recovery heat receiving tube 414.
Is equivalent to Similarly, in the engine cooling water side double pipe heat exchanger 601 including the outer pipe 60le and the inner pipe 60lf, the engine cooling water passes between the outer pipe 60le and the inner pipe 60lf, and the heat transfer liquid flows through the inner pipe 601f. , The outer wall 601f1 of the inner pipe 601f corresponds to the engine cooling water side radiating pipe 403 for recovering engine exhaust heat, and the inner wall 601f2 of the inner pipe 601f corresponds to the heat receiving pipe 415 for recovering engine exhaust heat.

The heat transfer liquid inlet 600 a, the heat transfer liquid outlet 600 b, the refrigerant inlet 60
0c and a refrigerant outlet 600d are provided. The heat transfer liquid inlet 600a has an engine exhaust heat recovery heat exchange unit side water circulation line 412b, the heat transfer liquid outlet 600b has one of the communication lines 8, the refrigerant inlet 600c has a pipe 218aA, and the refrigerant outlet 600d has a pipe 216aA. Each is connected.

As can be seen from FIG. 3, since the refrigerant and the heat carrier liquid flow in the refrigerant-side double-tube heat exchanger 600 in opposition, the temperature difference between the refrigerant and the heat carrier liquid will It can be made substantially equal over the entire length, and heat exchange is possible over the entire length of the double pipe.

The engine cooling water side double tube heat exchanger 601
Are a heat carrier liquid inlet 601a, a heat carrier liquid outlet 601b, an engine coolant inlet 601c, and an engine coolant outlet 60
1d is provided. The heat transfer liquid inlet 601a is one of the communication pipes 8, the heat transfer liquid outlet 601b is a heat transfer liquid circulation pipe 416 for heating, the engine cooling water inlet 601c is a water pipe 402A, and the engine cooling water outlet 601d is a water pipe. 4
04A.

The engine cooling water side double tube heat exchanger 6
Also in 01, the engine cooling water and the heat transfer liquid are made to flow in opposition, and heat exchange is possible over the entire length of the double pipe.

An engine cooling water drain passage 710 is connected to the water pipe 402A, and an engine cooling water drain passage 71 is provided.
0 is provided with an engine cooling water drain cock 710a. The engine cooling water is discharged by opening the engine cooling water drain cock 710a. Water pipe 4
The engine cooling water air vent passage 711 is connected to 04A, and the engine cooling water air is vented from the air vent passage open end 711a of the engine cooling water air vent passage 711. Further, a second heat transfer liquid air vent passage 712 is connected to the heat transfer liquid circulation pipe line 412b on the engine heat recovery unit side for exhaust heat recovery of the engine. Air venting of the heat transfer liquid is performed from 712a.

FIG. 4 is an external view of the engine exhaust heat recovery unit. 4A is a left side view, FIG. 4B is a front view,
FIG. 4C is a right side view.

The engine exhaust heat recovery unit 70 is formed in a box shape by a front panel 801, a floor panel 802, a ceiling panel 803, a rear panel 804, a right panel 805, and a left panel 806. The floor panel 802 is provided with a pair of support stays 807. The right panel 805 has a right cover 808 for taking out electric wires, and the left panel 806 has a left cover 809 for taking out electric wires.

FIGS. 5 to 8 show the actual shapes, arrangements, pipes, and the like of the components constituting the engine exhaust heat recovery unit 70 shown in FIG.

FIG. 5 is a sectional view of the internal exhaust heat recovery unit in detail. The engine exhaust heat recovery unit internal detailed portion is a view of the engine exhaust heat recovery unit 70 viewed from the left, showing a double-tube heat exchanger in a cross-sectional view, and showing a state where panels are removed. is there.

In the engine exhaust heat recovery unit 70, an engine cooling water side double tube heat exchanger 610 is arranged at the lower part, and a refrigerant side double tube heat exchanger 600 is arranged at the upper part. Further, a heat transfer liquid pump 41 is provided in the lower part of the engine exhaust heat recovery unit 70 inside the engine cooling water side double pipe heat exchanger 601.
3 and an electrical component box 900 that accommodates electrical components is disposed above and to the right of the refrigerant-side double-tube heat exchanger 600.

As can be seen from FIG. 5, since the heavy heat transfer liquid pump 413 is disposed at the lower center of the engine exhaust heat recovery unit 70, the stability of the engine exhaust heat recovery unit 70 is high. Similarly, as can be seen from FIG. 5, the air vent passage open end 711a and the engine vent passage open end 712a are arranged above the engine exhaust heat recovery unit 70.
Engine coolant and heat carrier liquid do not overflow. However, when the floor heating panel 556 is installed at a high position such as the second floor of the building, the discharge pressure of the heat transfer liquid pump 413 becomes large. Air accumulated in the air vent passage 712 during operation of the carrier liquid pump 413 is vented by opening the air vent passage open end 712a for a short time during operation. Also in this case, since the cock is arranged above the engine exhaust heat recovery unit 700, removing the ceiling panel 803 facilitates the air bleeding operation by operating the cock. Similarly, a cock may be arranged at the open end 711a of the air release passage and always closed, and the air may be released by opening the outdoor water pump 261 only for a short time during operation. Also in this case, the air bleeding operation by the cock operation becomes easy.

FIG. 6 is a sectional view of a detailed portion inside the engine exhaust heat recovery unit. The engine exhaust heat recovery unit internal detailed portion is a view of the engine exhaust heat recovery unit 70 viewed from the front, and shows a state in which the double tube heat exchanger is cut off and the panels are removed. Air release tank 41
In the upper part of 0A, there is an electrical box 90 containing electrical components.
0 is arranged.

FIG. 7 is a right side top view of the engine heat recovery unit with the ceiling panel removed. In the engine exhaust heat recovery unit 70, when the ceiling panel 803 is removed, the interior of the electrical component box 900 is exposed, and replacement of electrical components can be performed.

As can be seen from FIGS. 7 and 8, the ceiling panel 803 is removed, the electrical equipment box 900 is attached, and the pressurizing cap 700 above the air release tank 410A and the heat carrier liquid supply above the reserve tank 410B. Since both of the caps 707 are exposed upward in the upper part of the engine exhaust heat recovery unit 700, it is easy to refill the heat carrier liquid by removing one of the caps.

FIG. 8 is a top view of the engine exhaust heat recovery unit with the ceiling panel and the electrical box removed.
The double-tube heat exchanger 600 of the refrigerant side and the double-tube heat exchanger of the engine cooling water-side double tube heat exchanger 610 thereunder are respectively wound in a single coil shape. Since the air vent tank 410A, the reserve tank 410B, and the heat transfer liquid pump 413 are arranged, the space can be effectively used, and the engine exhaust heat recovery unit 70 can be formed compact.

In this embodiment, the engine exhaust heat recovery unit 70 is used in the engine-driven heat pump device 1, and during heating, high-temperature, high-pressure refrigerant upstream of the indoor heat exchanger 240 flows from the pipe 218 to the branch pipe. The refrigerant inlet 600c guided through the passage 218a, the connection joint part a9, the branch pipe line 218a which is a pipe outside the outdoor unit 2, the connection joint part b4, and the pipe 218aA in the engine exhaust heat recovery unit 70. An engine exhaust heat recovery refrigerant-side radiator pipe 418 that is a refrigerant radiator through which the refrigerant passes, and a refrigerant outlet 600d serving as an outlet of the refrigerant after passing through the refrigerant radiator
And the cooling water that has absorbed the engine exhaust heat passes through the pipe 253, the linear three-way valve 280, the thermostat 400, the packed valve 401, the connection joint portion a11, and the water pipe 4.
02, an engine cooling water inlet 601c guided through the connection joint b4, the water pipe 402aA in the engine exhaust heat recovery unit 70, and an engine cooling water radiator for the engine exhaust heat radiator through which the cooling water passes. Side radiating pipe 403, an engine cooling water outlet 601d serving as an outlet of cooling water after passing through the engine cooling water radiator, and a heat transfer liquid (water,
Or made of antifreeze) is connected joint portion b2, heat transfer liquid circulation pipe 411, air vent tank 410A, engine exhaust heat recovery tank unit side heat transfer liquid circulation pipe 41.
2a, a liquid circulation pump 413 for circulating the heat transfer liquid,
The heat transfer liquid inlet 600a guided through the heat transfer liquid circulation pipe 412b on the heat exchange unit side for exhaust heat recovery of the engine, the liquid circulation pump 413, the heat from the refrigerant radiator and the heat from the engine coolant radiator. Receiving pipe 414 for recovering engine exhaust heat, which is a refrigerant-side heat receiver that transmits heat to the heat carrier liquid, respectively.
In addition, an engine exhaust heat recovery heat receiving pipe 415, which is an engine cooling water side heat receiver, and a heat carrier liquid outlet 601b to the floor heating panel 556 are arranged.

As described above, the engine exhaust heat recovery unit 7
0 is formed independently of the outdoor unit 2, so that only the remodeling of the outdoor unit 2 by providing the outlet and the inlet of the engine cooling water, and the outlet and the inlet of the refrigerant, and the piping inside the outdoor unit 2, is required.
There is no need to place a heat exchanger inside. In addition, the pressure and temperature of the refrigerant on the high pressure side of the compressor during heating can be reduced by the amount of energy supplied to the engine exhaust heat recovery unit 70 via the refrigerant by the amount of the engine exhaust heat sent to the engine exhaust heat recovery unit 70.

Further, in the engine exhaust heat recovery unit 70, the heat radiating wall in contact with the engine cooling water and the heat receiving wall in contact with the heat transfer liquid are integrated to form the engine cooling water radiator and the engine cooling water side heat receiver. An engine cooling water-sided double-tube heat exchanger 601 as a water heat exchanger, a radiating wall in contact with the refrigerant, and a heat receiving wall in contact with the heat transfer liquid are integrated to form a refrigerant radiator / refrigerant side heat receiver. And a refrigerant-side double-pipe heat exchanger 600 as a heat exchanger for use. As described above, since another liquid for heat transfer is not disposed between the heat radiating wall and the heat receiving wall, heat transfer from the engine cooling water to the heat transfer liquid and heat transfer from the refrigerant to the heat transfer liquid are prevented. Each can be achieved by a simple structure.

Also, one of the engine cooling water and the heat transfer liquid flows through the inner pipe of the outer pipe and the inner pipe of the double pipe which is disposed inside the outer pipe and serves as a heat dissipation wall and a heat receiving wall. The engine cooling water side double pipe heat exchanger 601 is configured to flow the other between the inner pipe and the outer pipe, and one of the refrigerant and the heat transfer liquid is flowed inside the inner pipe of the double pipe, The refrigerant-side double-pipe heat exchanger 600 is configured to flow the other between the inner pipe and the outer pipe, and another liquid for heat transfer can be arranged between the heat radiating wall and the heat receiving wall. Since there is no heat transfer, heat transfer from the engine cooling water to the heat transfer liquid and heat transfer from the refrigerant to the heat transfer liquid can be achieved by simple structures.

Further, in the engine cooling water side double tube heat exchanger 601 as the engine cooling water side heat receiver and the refrigerant side double tube heat exchanger 600 as the refrigerant heat exchanger, the refrigerant side double tube heat exchange is performed. The heat exchanger 600 is placed above and the engine cooling water side double pipe heat exchanger 601 is placed below. However, any one of them can be placed vertically and the other one placed below. In this way, the floor area of the engine exhaust heat recovery unit 70 can be reduced, and the engine exhaust heat recovery unit 70 can be arranged in a narrow space that has room in the vertical direction.

Further, the engine cooling water side double tube heat exchanger 601 and the refrigerant side double tube heat exchanger 600, each of which has a double tube wound in a coil shape, with one of them up and the other down. While overlapping vertically, the lower end of the heat transfer liquid passage of the upper double tube receiver and the upper end of the heat transfer liquid passage of the lower double tube receiver are connected by piping. Therefore, the length of the pipe connecting the heat transfer liquid passages of the double-tube heat receiver to each other can be reduced.

On the upper side, the refrigerant side double tube heat exchanger 600
The engine cooling water side double tube heat exchanger 601 is disposed on the lower side, and the upper end of the heat carrier liquid passage of the upper double tube heat receiver is a heat carrier liquid inlet 600a from the floor heating panel 556. The lower end of the heat transfer liquid passage of the lower double tube heat receiver is a heat transfer liquid outlet 601a from the floor heating panel 556,
The engine cooling water higher than the refrigerant temperature guided to the refrigerant-side double-tube heat exchanger 600 is supplied to the engine-cooling water-side double-tube heat exchanger 6.
01. As described above, since the low-temperature refrigerant and the heat transfer liquid exchange heat, and then exchange heat with the next-highest engine cooling water, the refrigerant-side double pipe heat exchanger 600 and the engine cooling water-side double pipe heat exchange. Since it is possible to apply heat to the heat carrier liquid in both of the vessels 601, the heat carrier liquid can be efficiently heated.

The upper end of the refrigerant passage of the refrigerant-side double-pipe heat exchanger 600 is a refrigerant outlet 600d to the expansion valve, and the lower end of the refrigerant passage is a refrigerant inlet 600c from the compressor. The upper end of the engine cooling water passage of the water side double tube heat exchanger 601 is an engine cooling water outlet 601d to the engine, and the lower end of the engine cooling water passage is an engine cooling water inlet 601c from the engine. Since the heat exchange between the low-temperature refrigerant and the heat carrier liquid and the heat exchange with the next-higher temperature engine cooling water can be performed more reliably, the heat carrier liquid can be heated more efficiently.

The refrigerant-side double tube heat exchanger 600
The engine cooling water side double tube heat exchanger 601 may be arranged on the upper side, and in this case, the lower end of the heat transfer liquid passage of the lower double tube heat receiver is placed on the floor heating panel. The heat transfer liquid inlet from the heat transfer liquid 556 and the upper end of the heat transfer liquid passage of the upper double tube heat receiver serve as the heat transfer liquid outlet to the floor heating panel 556 and lead to the refrigerant side double tube heat exchanger 600. The engine cooling water higher than the refrigerant temperature can be guided to the engine cooling water side double-pipe heat exchanger 601, and the low-temperature refrigerant exchanges heat with the heat carrier liquid, and then the engine cooling water having the next higher temperature Since heat is exchanged with water, it is possible to apply heat to the heat transfer liquid in both the refrigerant-side double pipe heat exchanger 600 and the engine cooling water-side double pipe heat exchanger 601, so that the heat transfer liquid can be efficiently provided. Can be heated.

The lower end of the refrigerant passage of the refrigerant-side double-pipe heat exchanger 600 serves as a refrigerant outlet 600d to the expansion valve, and the upper end of the refrigerant passage serves as a refrigerant inlet 600c from the compressor. The lower end of the engine cooling water passage of the water side double pipe heat exchanger 601 is an engine cooling water outlet 601d to the engine, and the upper end of the engine cooling water passage is an engine cooling water inlet 601c from the engine. Since the heat exchange between the low-temperature refrigerant and the heat carrier liquid and the heat exchange with the next-higher temperature engine cooling water can be performed more reliably, the heat carrier liquid can be heated more efficiently.

FIG. 9 is a control circuit diagram of the engine driven heat pump device. Engine driven heat pump device 1
Is a control device for each of the outdoor unit 2, the indoor unit 522, the engine exhaust heat recovery unit 70, and the branch unit 535.
It has a sensor group and an actuator group. The outdoor CPU 615 of the outdoor unit 2, the indoor CPU 616 of the indoor unit 522,
The CPU 617 of the engine exhaust heat recovery unit 70 and the branch unit CPU 618 of the branch unit 535 transmit and receive information via the data buses 620, 621, and 622, and control them.

The outdoor CPU 615 includes a throttle valve opening control actuator 311, a drive actuator for the linear three-way valve 280, a drive actuator 238 a for the electronic expansion valve 238, a drive actuator for the outdoor fans 235 and 266, a drive actuator for the outdoor water pump 261, In addition, it controls the actuator group 640, for example, the fuel gas flow control valve 312, the four-way valve 232, the electric bypass valve 422, the electric open / close valve 426, the electric open / close valve 424, etc., and the engine rotation sensor 310, the high pressure side pressure sensor 301, the refrigerant temperature Sensor 425, engine coolant temperature sensor 431,
432, and other sensor groups 641, for example, the detection data of the engine accommodation room temperature sensor 430, the outside air temperature sensor 439, the high pressure side temperature sensor 303, and the like.

The indoor CPU 616 includes the blower fan 240
a, the indoor louver motor 240b, the indoor refrigerant liquid temperature sensor 572, the indoor remote controller 570a, the indoor temperature sensor 571, and the drive actuator 23 of the electronic expansion valve 238
8b or the like or capture of detection data. Note that the indoor remote control operation unit 570a is
70.

The CPU 617 takes in detection data for the drive actuator 413a of the heat transfer liquid pump 413 utilizing engine exhaust heat, the refrigerant liquid temperature sensor 419, the floor warm remote control operation section 570b, the floor temperature sensor 573, the electronic flow control valve 555, and the like. Control the actuator. The degree of opening of the electronic expansion valve 238 in the outdoor unit 2 is also determined by the outdoor CPU 615.
Is controlled by a command from the CPU 617 via the.

Next, the engine-driven heat pump device 1
Is a coolant that exchanges heat between the engine coolant recovered from the engine exhaust heat and the coolant in the coolant circuit 210.
The supply is branched and supplied to the double-pipe heat exchanger 233, which is an inter-refrigerant heat exchanger, and the engine exhaust heat recovery device A, and the blowing fan 240
a, and when the demand for heating becomes large, the cooling water is supplied to the double-tube heat exchanger 233, which is a water-refrigerant heat exchanger, in preference to the supply of the cooling water to the engine exhaust heat recovery device A. Control is performed to increase the supply amount. It takes a long time to raise the temperature of the engine exhaust heat by the heating control. The heat is recovered in the refrigerant circuit 210 from the radiator installed on the floor, and the engine exhaust heat is supplied to the indoor heat exchanger 240 with priority. In addition, the warm air from the blower fan 240a acts on a person in the room, and can satisfy the heating demand.

FIG. 10 is a wiring diagram in the engine exhaust heat recovery unit. The engine exhaust heat recovery unit 70 includes a connection terminal 809 disposed in a left cover 809 for taking out an electric wire.
a of the indoor remote controller 570 via the connection terminal 808a disposed in the right cover 808 for taking out electric wires.
Connected to.

CPU 617 and outdoor unit 2 are installed in electrical box 900 arranged in engine exhaust heat recovery unit 70.
Interface 950 connected to the side, power supply circuit 9
51, a relay 952, and a relay driver 953 are arranged. Further, a signal interface 950 connected to the indoor remote controller 570 is arranged. Further, electrical components such as a sensor interface 955 connected to each sensor such as the refrigerant liquid temperature sensor 419 are arranged. Have been.

FIG. 11 is an installation diagram of the engine exhaust heat recovery unit. The engine exhaust heat recovery unit 70 is connected to the outdoor unit 2 by wiring and piping. Further, the engine exhaust heat recovery unit 70 is connected by wiring to an indoor remote control device 570 disposed indoors, and similarly connected by a pipe to a floor heating panel 556 disposed indoors.

As described above, the engine exhaust heat recovery unit 70 is disposed between the outdoor unit 2 and the indoor remote controller 570 and the floor heating panel 556. As can be seen from FIGS. On the right side surface of the exhaust heat recovery unit 70, connection joints b4 and b6, which are the respective inlets of the refrigerant and the engine cooling water from the outdoor unit 2, and the connections that form the respective outlets of the refrigerant and the engine cooling water to the outdoor unit 2. The joints b3 and b5 are centrally arranged, and an electric wire take-out right cover 808 for electric wiring with the outdoor unit 2 is arranged. Also, as can be seen from FIGS. 4A and 4B), on the left side surface opposite to the right side surface of the engine exhaust heat recovery unit 70, a connection joint portion b4 which is an inlet of the heat transfer liquid from the floor heating panel 556 and Floor heating panel 556
The connection joint part b3 which is the outlet of the heat carrier liquid to the floor heating panel 556 and the left cover 809 for taking out electric wires for electric wiring between the floor heating panel 556 and the indoor remote controller 570 are arranged. . For this reason, the piping length and the wiring length can be shortened, and the construction work such as piping and wiring connection can be improved.

FIG. 12 is a flow chart of energy during operation.

The fuel is generated by combustion of the engine 201.
Energy E₁E₂Mechanical energy of compressor 2
08 and the energy E₁Exhaust heat within
Is further branched and energy E₃Is used as engine cooling water
Recovered and energy E₄Or with exhaust gas
It is released from the surface of the engine 201 into the atmosphere. engine
Energy E recovered in cooling water₃Is a linear three-way valve 2
At 80, the engine coolant is I₂, I₁Branch to
Take energy E₃₁And energy E₃₂Branch to
You. Evaporator (heating outdoor heat exchanger 234, cooling indoor heat
Energy E in the heat exchanger 240)₅Given to the refrigerant
Energy E₃₁Is in the double tube heat exchanger 233
Given to the refrigerant. Thus, the energy E₅And energy
Lugie E ₃₁And energy E₄And energy E
₆Becomes Energy E₃₂Is engine cooling water
Stat 400 with I₃, I₄Energy to branch to
Lugie E₃₂₁And energy E₃₂₂Branch to Energy
Lugie E₆Is branched and energy E₆₁, E₆₂Tona
You. Energy E₆₁Is a condenser (heating indoor heat exchanger 2)
40, heat is dissipated in the outdoor heat exchanger 234) during cooling.
You. Energy E₆₂And energy E₃₂₁Is merging
Nergie E₇Radiated from the floor heating panel 556
You. On the other hand, energy E₃₂₂Is the outdoor radiator 265
Heat is released into the atmosphere.

Energy E₂Is energy E₁30 ~
40%, and the energy E is low because the outside air temperature during heating is low.
₅Is small. For this reason, the room temperature rises at the beginning of heating
It is difficult to do, but at the start of heating
7 to 10, the linear three-way valve 280 is operated.
Increase the opening (at least 20% or more) ₂
To increase part of the exhaust heat into the refrigerant,
The heat radiation by the exchanger 240 can be increased,
Is started, the indoor fans are immediately warmed by the indoor fan.
The airflow can be sensed and heating requests can be met early.
You can help. Also, at the start of heating, the linear three-way valve 28
0 to 50% or even 100% (I₂= 50
１００100%) is better. Further, the electronic expansion valve 2
38 is 20% or less of the specified opening, and fully closed.
And the amount of heat radiation of the engine heat recovery refrigerant radiator 418 is suppressed.
To heat the exhaust air from the engine
Heat exchange prior to engine exhaust heat recovery
The heat can be dissipated by the vessel 240. Heat radiation started
The indoor fan immediately warms the room
To be able to sense flow and meet heating requirements early
Can be.

During cooling, heat is absorbed by the evaporator (indoor heat exchanger 240) while energy E is absorbed.
₃₁ and the energy E ₆₂ is set to 0,
₃₂₁ makes it possible to recover engine exhaust heat.

FIG. 13 is a view showing an engine heat recovery unit according to another embodiment. This engine exhaust heat recovery unit 1070 is different from the engine exhaust heat recovery unit 70 of the above-described embodiment in that the engine exhaust heat recovery unit 70 has a refrigerant pipe 110 between the engine exhaust heat recovery refrigerant-side radiating pipe 418 and the connection joint portion b3.
This is the point that the electronic expansion valve 1238a is arranged in the middle of 0. The connection joint b3 of this engine exhaust heat recovery unit 1070 is a connection joint a1 of the outdoor unit 2, and the connection joint b4 is a connection joint a2 of the outdoor unit 2.
And used by refrigerant pipes 1101 and 1102, respectively. That is, the engine exhaust heat recovery unit 10
70 can be easily used by being connected to the outdoor unit 2 having no electronic expansion valve.

The refrigerant pipe between the indoor unit 1522 and the refrigerant pipe 1101 connecting the connection joint a1 and the connection joint b3 is connected between the indoor unit 1522 and the refrigerant pipe connecting the connection joint a2 and the connection joint b4. It becomes possible by connecting the middle of 1102 and the indoor unit 1522, respectively. The indoor unit 1522 in this case
Uses an indoor unit 1522 with a built-in electronic expansion valve having a built-in electronic expansion valve 1238b.

According to this, the refrigerant whose temperature has been raised to a high temperature and high pressure by the compressor is branched, and one of the refrigerants is branched to the indoor heat exchanger 24 of the indoor unit 1522.
0, the room air is heated, and the other is circulated to the engine exhaust heat recovery unit 1070 to heat the floor heating panel 556 via the heat transfer liquid, thereby raising the floor temperature. The person in the room is heated by both the indoor air and the floor, and inserts the engine exhaust heat recovery unit 1070 in the middle of the refrigerant pipe between the outdoor unit 2 and the indoor unit 1522. When the heat pump device 1 can recover the exhaust heat of the engine only by providing a pipe for circulating the cooling water between the floor heating panels 556, the outdoor unit 2 and the indoor unit 1
The modification of the 522 is not required, and the modification can be easily performed.

The opening degree of the electronic expansion valve 1238a is determined by the difference between the saturated liquid temperature calculated based on the high pressure detected by the high pressure side pressure sensor 30l and the refrigerant temperature detected by the refrigerant temperature sensor 419. If it is larger, the opening is increased. As a result, the high pressure is reduced so that the difference approaches a predetermined value. If the difference is smaller than a predetermined value, the opening is reduced. As a result, the high pressure is increased so that the difference approaches a predetermined value. In this way, the electronic expansion valve 1238a is subjected to the feedback control type subcool control for the opening degree. Still further, a capillary can be arranged in place of the electronic expansion valve 1238a to reduce the cost.

FIG. 14 is a diagram showing another embodiment of the engine exhaust heat utilization device. In this embodiment, instead of the floor heating panel 556 of the engine-driven heat pump device 1 shown in FIGS. 1 and 2, a heat radiator 2002 as a heat radiator using engine exhaust heat, and heat exchange incorporating the heat radiator 2002 are provided. A tank 2000 and a main hot water supply tank 2001 are provided. City water is supplied to the heat exchange tank 2000, and an open / close valve 2010 is provided at an upper portion. The engine heat recovered from the engine heat recovery unit 70 is circulated through the heat radiating section 2002.

The heat exchange tank 2000 and the main hot water supply tank 2001 are connected. The main hot water supply tank 2001 has a relief valve 2003 with a valve opening pressure higher than the water pressure of city water.
, A faucet 2004 is provided, and a float type level holding valve 2005 is provided inside the main hot water supply tank 2001.

In this embodiment, the engine exhaust heat utilization device is configured to circulate a part of the engine exhaust heat to the heat radiating portion 2002 provided in the heat exchange tank 2000 provided with the city water introduction portion, and to supply the main hot water. The hot water supply device G includes a tank 2001 provided with an internal hot water outlet.
, And the room can be heated early.

FIG. 15 is a view showing still another embodiment of the engine exhaust heat utilization device. In this embodiment, like the other embodiments, instead of the floor heating panel 556,
An engine exhaust heat utilizing heat radiating section 2111;
1 is provided. An opening / closing door 210 is provided in front of a casing 2101 of the dryer 2100.
2 can be opened and closed with a hinge 2103 as a fulcrum. In a casing 2101 of the dryer 2100, an intake shroud 2104 having an air intake 2104a, a discharge shroud 2105 having an air exhaust port 2105a, and a rotating drum 2106 are provided. Casing 2101
, An outside air introduction passage 2107 for guiding outside air is formed by an intake shroud 2104, and an inside air discharge passage 2108 for discharging inside air is formed by a discharge shroud 2105. The rotating drum 2106 is a rotating drum holding bearing device 2
The motor is rotatable by a motor 109 and is rotated by a drum drive motor 2110.

The air intake 21 of the intake shroud 2104
The outside air is introduced from the outside air 04a, and a radiator 2111 is arranged in the outside air introduction path 2107 for guiding the outside air.
A fan 2112 is provided. In the heat radiating part 2111,
The engine exhaust heat recovered from the engine exhaust heat recovery unit 70 is circulated.

In this embodiment, a heat radiating section 2111 in which an engine exhaust heat utilization device is installed in an outside air introduction path 2107 of a casing 2101 provided with an outside air introduction path 2107 for guiding outside air and an inside air discharge path 2108 for discharging inside air. The drying device H is configured to circulate a part of the engine exhaust heat, so that the room can be heated earlier than the drying device H.

FIG. 16 is a view showing still another embodiment of the engine exhaust heat utilization device. In this embodiment, a floor heating device I, a drying device H, and a hot water supply device G are provided. Hot water supply device G has hot water storage tank 2200, and city water is supplied. Hot water storage tank 2200 has a relief valve 22
03 and a faucet 2204 are provided.
Is provided with a molten metal level holding valve 2205. In addition, inside the hot water storage tank 2200,
06 is arranged. A part of the engine exhaust heat from the engine exhaust heat recovery unit 70 is circulated through the radiator 2006. The floor heating device I is a floor heating panel 5
The floor heating device I and the drying device H are configured to circulate engine exhaust heat recovered from the engine exhaust heat recovery unit 70 via a linear three-way valve 2210 capable of adjusting the amount of branch hot water.

In this embodiment, a part of the engine exhaust heat is circulated to the respective heat radiating portions of at least two of the floor heating device I, the drying device H and the hot water supply device G. Thus, it is possible to heat the room at an early stage in preference to the plurality of engine exhaust heat utilization devices. Although the heat radiating section 2006 and the floor heating panel 556 of the hot water supply device G are connected in parallel, the cooling water from which the engine exhaust heat is recovered may be circulated from the heat radiating section 2006 to the floor heating panel 556 in series.

FIG. 17 is a view showing still another embodiment of the engine exhaust heat utilization device. In this embodiment, the engine exhaust heat recovery unit 70B is formed similarly to the engine exhaust heat recovery unit 70 of the embodiment of FIG. 3, but the engine exhaust heat utilizing heat transport liquid tank unit of the engine exhaust heat recovery unit 70 is used. 410 is abolished, and city water is supplied via the connection joint part b2 '.

In this embodiment, FIGS. 1 and 2
A hot water supply device G is provided in place of the floor heating panel 556 of the engine-driven heat pump device 1 indicated by, and a hot water storage tank 2200 is connected to the engine exhaust heat recovery unit 70B by a connection joint b1. this is,
Unlike the engine exhaust heat recovery unit 70 shown in FIG. 3, the water pressure of city water is used, and city water is connected to the connection joint b2.
'The hot water storage tank 2 which also doubles as a heat radiating part via the heat transfer liquid circulation pipe 412b on the heat exchange unit side for recovering engine exhaust heat.
The city water passes through the refrigerant-side double-pipe heat exchanger 600 and the engine coolant-side double-pipe heat exchanger 601 and is sent to the hot water storage tank 2200 via the connection joint b1. Can be

In this embodiment, the engine exhaust heat utilization device is provided with an engine cooling water radiating section through which engine cooling water circulates, and a heat receiving section opposite to the engine cooling water radiating section. 600, an engine cooling water side double pipe heat exchanger 601, which guides city water to a heat receiving portion of the refrigerant side double pipe heat exchanger 600 and the engine cooling water side double pipe heat exchanger 601 and receives heat. Water heater G provided with a lead-out part that allows the city water whose temperature has risen in the part to be drawn out to the outside
By using the hot water supply device G as the engine exhaust heat utilization device, it is possible to heat the room at an early stage prior to the hot water supply device G.

[0117]

As described above, according to the first aspect of the present invention, during heating, a refrigerant inlet through which a high-temperature and high-pressure refrigerant upstream of the indoor heat exchanger is guided, and a refrigerant radiator through which the high-temperature and high-pressure refrigerant passes. A coolant outlet serving as a coolant outlet after passing through the coolant radiator, an engine coolant inlet through which coolant that has absorbed engine exhaust heat is guided, an engine coolant radiator through which the coolant passes, The engine coolant outlet, which is the coolant outlet after passing the coolant radiator, the heat carrier fluid inlet for the heat carrier fluid, and the heat from the coolant radiator and the heat from the engine coolant radiator, respectively Arranges the refrigerant-side heat receiver and the engine coolant-side heat receiver to transmit, and the heat transfer liquid outlet of the heat transfer liquid to the radiator for utilizing engine exhaust heat, and makes the engine exhaust heat recovery unit independent of the outdoor unit Because it was formed in the engine The engine cooling water heat recovery,
In the case of having a plurality of sets of an engine cooling water outlet and an engine cooling water inlet for circulating the refrigerant to the hot water boiler outside the outdoor unit and a refrigerant outlet and a refrigerant return port for circulating the refrigerant to the indoor unit, the hot water boiler is used. Stop the circulation of
Piping to circulate the engine cooling water directly to the engine exhaust heat recovery unit, or branching from the middle of the circulation path to the hot water boiler and circulating to the engine exhaust heat recovery unit, while having multiple refrigerant outlets and refrigerant return The refrigerant is circulated to the engine exhaust heat recovery unit by using one of the sets of ports, or it is merely diverted from the refrigerant circulation path to the indoor unit and circulated to the engine exhaust heat recovery unit. In addition, additional installation of the engine exhaust heat recovery unit can be easily performed. In the case of an outdoor unit having only one set of the refrigerant outlet and the refrigerant return port and having no engine cooling water outlet or engine cooling water inlet for circulation to an external hot water boiler, the engine cooling water is provided to the outdoor unit. It is not necessary to dispose a heat exchanger in the outdoor unit only by modifying the outlet, the engine cooling water inlet, the refrigerant outlet, the refrigerant inlet, and the respective outdoor unit piping. Further, the pressure and temperature of the refrigerant on the high pressure side of the compressor during heating can be reduced by the amount of energy supplied to the engine exhaust heat recovery unit via the refrigerant by the amount of engine exhaust heat sent to the engine exhaust heat recovery unit.

According to the second aspect of the present invention, the heat radiating wall in contact with the engine cooling water and the heat receiving wall in contact with the heat carrier liquid are integrated to form the engine cooling water radiator and the engine cooling water side heat receiver. The operation of claim 1, wherein the heat exchanger, the heat radiating wall in contact with the refrigerant, and the heat receiving wall in contact with the heat transfer liquid are integrated to provide a refrigerant heat exchanger that serves as a refrigerant radiator and a refrigerant-side heat receiver. In addition to the effect, there is no need to place another liquid for heat transfer between the heat dissipating wall and the heat receiving wall, so heat transfer from engine cooling water to heat transfer liquid and heat transfer from refrigerant to heat transfer liquid. Each can be achieved by a simple structure.

According to the third aspect of the present invention, the engine cooling water and the heat transfer liquid are placed inside the inner pipe of the outer pipe and the inner pipe, which is disposed inside the outer pipe and serves as a heat dissipation wall and a heat receiving wall. The engine cooling water side double pipe heat exchanger is constructed by flowing one of the inner pipe and the other between the inner pipe and the outer pipe, and the refrigerant and heat transfer liquid are placed inside the inner pipe of the double pipe. Since the refrigerant-side double-pipe heat exchanger is constituted by flowing one of the pipes and the other between the inner pipe and the outer pipe, in addition to the effect of claim 1, between the heat radiating wall and the heat receiving wall Since there is no need to place another liquid for heat transport,
The heat transfer from the engine cooling water to the heat transfer liquid and the heat transfer from the refrigerant to the heat transfer liquid can be achieved by simple structures.

According to the fourth aspect of the present invention, one of the engine cooling water-side heat receiver and the refrigerant heat exchanger is vertically stacked with the other up and the other down. In addition to the effects, the floor area of the engine exhaust heat recovery unit can be reduced, and the engine exhaust heat recovery unit can be arranged in a narrow space with a margin in the vertical direction.

According to the fifth aspect of the present invention, the engine cooling water-side double-tube heat exchanger and the refrigerant-side double-tube heat exchanger, each of which has a double tube wound in a coil shape, are arranged such that one of them is on the upper side and the other is on the other side. And the lower end of the heat transfer liquid passage of the upper double tube receiver and the upper end of the heat transfer liquid passage of the lower double tube receiver. Since the pipes are connected by a pipe, in addition to the function and effect of the third aspect, the length of the pipe connecting the heat transfer liquid passages of the double pipe heat receivers to each other can be reduced.

According to the sixth aspect of the present invention, the refrigerant-side double-pipe heat exchanger is disposed on the upper side, and the engine cooling water-side double-pipe heat exchanger is disposed on the lower side. The upper end of the liquid passage is a heat transfer liquid inlet from the floor heating panel, the lower end of the heat transfer liquid passage of the lower double tube receiver is a heat transfer liquid outlet from the floor heating panel, Since the engine cooling water higher than the refrigerant temperature guided to the refrigerant-side double-pipe heat exchanger is guided to the engine-cooling water-side double-pipe heat exchanger, in addition to the function and effect of claim 5, first the temperature is low. The heat exchange between the refrigerant and the heat transfer liquid and the heat exchange with the next highest temperature engine cooling water, the heat transfer liquid is converted into the heat transfer liquid by both the refrigerant double pipe heat exchanger and the engine cooling water double pipe heat exchanger. Since heat can be given, the heat carrier liquid can be efficiently heated.

According to the present invention, the upper end of the refrigerant passage of the refrigerant-side double pipe heat exchanger serves as a refrigerant outlet to the expansion valve, and the lower end of the refrigerant passage serves as a refrigerant inlet from the compressor. ,
Since the upper end of the engine cooling water passage of the engine cooling water side double pipe heat exchanger is an engine cooling water outlet to the engine, and the lower end of the engine cooling water passage is an engine cooling water inlet from the engine, In addition to the function and effect of claim 6, heat exchange between the low-temperature refrigerant and the heat carrier liquid and then heat exchange with the high-temperature engine cooling water can be performed more reliably. Can be heated.

According to the eighth aspect of the present invention, the refrigerant-side double-tube heat exchanger is disposed on the lower side, and the engine cooling water-side double-tube heat exchanger is disposed on the upper side. The lower end of the carrier liquid passage is the heat carrier liquid inlet from the engine exhaust heat radiator, and the upper end of the heat carrier liquid passage of the upper double-tube heat receiver is connected to the engine exhaust heat radiator. Since the heat transfer liquid outlet is used to guide the engine cooling water having a temperature higher than the refrigerant temperature guided to the refrigerant-side double-tube heat exchanger to the engine-cooling water-side double-tube heat exchanger, the effect of claim 5 can be improved. In addition, heat exchange between the low-temperature refrigerant and the heat transfer liquid first occurs, and then heat exchange occurs with the high-temperature engine cooling water. Since it is possible to apply heat to the heat carrier liquid in both cases, the heat carrier liquid can be efficiently heated.

According to the ninth aspect of the present invention, the lower end of the refrigerant passage of the refrigerant-side double-pipe heat exchanger serves as a refrigerant outlet to the expansion valve, and the upper end of the refrigerant passage serves as a refrigerant inlet from the compressor. ,
Since the lower end of the engine cooling water passage of the engine cooling water side double pipe heat exchanger is an engine cooling water outlet to the engine, and the upper end of the engine cooling water passage is an engine cooling water inlet from the engine, In addition to the effects of claim 8, heat exchange between the low-temperature refrigerant and the heat transfer liquid and then heat exchange with the high-temperature engine cooling water can be performed more reliably. Can be heated.

According to the tenth aspect of the present invention, a throttle or a capillary for pressure drop is arranged in the middle of the refrigerant pipe between the refrigerant radiator and the outlet of the refrigerant. In the case of using a floor heating panel as an engine exhaust heat radiator, the refrigerant which has been heated and pressurized by a compressor is branched, and one of the refrigerant is circulated to an indoor heat exchanger of the indoor unit to raise the temperature of indoor air. Is circulated to the engine exhaust heat recovery unit to heat the floor heating panel via the heat transfer liquid, thereby raising the floor temperature. The indoor person is warmed by both the indoor air and the floor, and the engine exhaust heat recovery unit is inserted in the middle of the refrigerant pipe between the outdoor unit and the indoor unit. By simply providing a pipe for circulating the cooling water between them, the heat pump device can recover the exhaust heat of the engine without any modification of the outdoor unit or the indoor unit, and the modification work can be easily performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing the overall configuration of an engine-driven heat pump device.

FIG. 2 is a diagram showing an installation state of an air conditioner in each room.

FIG. 3 is a detailed view of an engine exhaust heat recovery unit.

FIG. 4 is an external view of an engine exhaust heat recovery unit.

FIG. 5 is a sectional view of a detailed portion inside the engine exhaust heat recovery unit.

FIG. 6 is a sectional view of a detailed portion inside the engine exhaust heat recovery unit.

FIG. 7 is a right side top view of the engine exhaust heat recovery unit with a ceiling panel removed.

FIG. 8 is a top view of the engine heat recovery unit with the ceiling panel and the electrical box removed.

FIG. 9 is a control circuit diagram of the engine-driven heat pump device.

FIG. 10 is a wiring diagram in the engine exhaust heat recovery unit.

FIG. 11 is an installation diagram of an engine exhaust heat recovery unit.

FIG. 12 is a flow chart of energy during operation.

FIG. 13 is a diagram showing an engine exhaust heat recovery unit of another embodiment.

FIG. 14 is a view showing another embodiment of the engine waste heat utilization device.

FIG. 15 is a view showing still another embodiment of the engine exhaust heat utilization device.

FIG. 16 is a diagram showing still another embodiment of the engine exhaust heat utilization device.

FIG. 17 is a view showing still another embodiment of the engine exhaust heat utilization device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine drive type heat pump apparatus 2 Outdoor unit 70, 1070 Engine exhaust heat recovery unit 201 Engine 208 Compressor 210 Refrigerant circuit 240 Indoor heat exchanger 403 Engine exhaust heat recovery engine cooling water side radiating pipe 413 Liquid circulation pump 415 Engine exhaust heat Heat receiving pipe for recovery 418 Refrigerant side heat discharge pipe for exhaust heat recovery of engine 522, 1522 Indoor unit 556 Floor heating panel 600 Refrigerant side double pipe heat exchanger 600c Refrigerant inlet 600d Refrigerant outlet 601 Engine cooling water side double pipe heat exchanger 601c Engine cooling water inlet 601b Heat carrier liquid outlet 601d Engine cooling water outlet

Claims (10)

[Claims] 1. During heating operation by an engine-driven compressor,
An outdoor unit including a refrigerant circuit that circulates refrigerant from a compressor to an indoor heat exchanger, an expansion valve, an outdoor heat exchanger and a compressor, and at least an engine, a compressor, and an outdoor heat exchanger.
Used in an engine-driven heat pump apparatus including an indoor unit having an indoor heat exchanger, and a refrigerant inlet through which high-temperature, high-pressure refrigerant upstream of the indoor heat exchanger is guided during heating.
A refrigerant radiator through which the high-temperature and high-pressure refrigerant passes, a refrigerant outlet as an outlet of the refrigerant after passing through the refrigerant radiator, an engine cooling water inlet through which cooling water that has absorbed engine exhaust heat is led, and this cooling water An engine cooling water radiator passing therethrough, an engine cooling water outlet serving as an outlet of cooling water after passing through the engine cooling water radiator, a heat carrier liquid inlet of a heat carrier liquid, and heat and engine cooling from the refrigerant radiator. A refrigerant side heat receiver and an engine cooling water side heat receiver for transmitting heat from the water radiator to the heat carrier liquid, respectively, and a heat carrier liquid outlet of the heat carrier liquid to the heat radiating portion for utilizing engine exhaust heat are arranged. A floor heating unit, characterized in that: 2. A heat exchanger for engine cooling water, wherein a heat radiating wall in contact with the engine cooling water and a heat receiving wall in contact with the heat transfer liquid are integrated to serve as an engine cooling water radiator and an engine cooling water side heat receiver. The engine exhaust system according to claim 1, wherein a heat exchanger for a refrigerant, which is a refrigerant radiator and a refrigerant-side heat receiver integrated with a heat radiating wall in contact with the heat transfer liquid and a heat receiving wall in contact with the heat transfer liquid, is arranged. Heat recovery unit. 3. One of engine cooling water and heat transfer liquid is provided inside an inner tube of a double tube comprising an outer tube and an inner tube disposed inside the outer tube and serving as the heat radiating wall and the heat receiving wall. The engine cooling water side double pipe heat exchanger is constituted by flowing the other between the inner pipe and the outer pipe, and one of the refrigerant and the heat transfer liquid is provided inside the inner pipe of the double pipe. 2. The engine exhaust heat recovery unit according to claim 1, wherein the refrigerant-side double-pipe heat exchanger is configured so that the refrigerant flows between the inner pipe and the outer pipe. 4. The heat exchanger according to claim 1, wherein one of the heat receiver for the engine cooling water and the heat exchanger for the refrigerant is vertically stacked with one of the heat exchangers on the upper side and the other on the lower side. The engine exhaust heat recovery unit according to any one of the above. 5. An engine cooling water-side double-tube heat exchanger and a refrigerant-side double-tube heat exchanger each having a double tube wound in a coil shape, one of which is up and the other is down. And that the lower end of the heat transfer liquid passage of the upper double-tube receiver and the upper end of the heat transfer liquid passage of the lower double-tube receiver are connected by piping. Claim 3
The engine exhaust heat recovery unit according to 1. 6. A double-tube heat exchanger on the refrigerant side on the upper side and a double-tube heat exchanger on the engine cooling water side on the lower side, and the upper end of the heat transfer liquid passage of the upper double-tube receiver. Part is a heat transfer liquid inlet from the floor heating panel, a lower end of the heat transfer liquid passage of the lower double tube receiver is a heat transfer liquid outlet from the floor heating panel, and the refrigerant side double pipe is The engine exhaust heat recovery unit according to claim 5, wherein engine cooling water having a temperature higher than a refrigerant temperature guided to the heat exchanger is guided to the engine cooling water side double pipe heat exchanger. 7. An engine cooling water side, wherein an upper end of a refrigerant passage of the refrigerant-side double-pipe heat exchanger serves as a refrigerant outlet to an expansion valve, a lower end of the refrigerant passage serves as a refrigerant inlet from a compressor. The upper end of the engine cooling water passage of the double pipe heat exchanger is an engine cooling water outlet to the engine, and the lower end of the engine cooling water passage is the engine cooling water inlet from the engine. Item 7. An engine exhaust heat recovery unit according to Item 6. 8. A double-tube heat exchanger on the refrigerant side and a double-tube heat exchanger on the engine cooling water side on the lower side, and the lower part of the heat transfer liquid passage of the double-tube heat receiver is arranged on the lower side. The side end is a heat carrier liquid inlet from the engine exhaust heat utilizing radiator, the upper end of the heat carrier liquid passage of the upper double pipe heat receiver is a heat carrier liquid outlet to the engine exhaust heat utilizing radiator, 6. The engine exhaust system according to claim 5, wherein engine cooling water having a temperature higher than a refrigerant temperature guided to the refrigerant side double pipe heat exchanger is guided to the engine cooling water side double pipe heat exchanger. Heat recovery unit. 9. A refrigerant outlet to an expansion valve, a lower end of the refrigerant passage of the refrigerant-side double-pipe heat exchanger, an upper end of the refrigerant passage to a refrigerant inlet from a compressor, and an engine cooling water side. The lower end of the engine cooling water passage of the double pipe heat exchanger is an engine cooling water outlet to the engine, and the upper end of the engine cooling water passage is the engine cooling water inlet from the engine. Item 7. An engine exhaust heat recovery unit according to Item 6. 10. The engine according to claim 1, wherein a throttle or a capillary for reducing pressure is arranged in the middle of the refrigerant pipe between the refrigerant radiator and the refrigerant outlet. Exhaust heat recovery unit.