JPH10325640A - Driven by engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a proper supplying of waste heat of an engine in response to a heating operation and a hot water utilization, enable a heating requirement to be rapidly satisfied just after starting the heating operation, and further prevent frosting from being generated under utilization of the waste heat of the engine in the case where an outdoor heat exchanger shows a frosted state. SOLUTION: In a device 1 in which a part of waste heat of an engine is recovered into a refrigerant circuit during a heating operation and another part of it is used for hot water, a floor heating device is installed in a room R where an indoor heat exchanger acting as a hot water utilizing section is installed, wherein, during heating operation performed by a compressor 6, refrigerant is flowed in a refrigerant circuit 200 in which the compressor 6, the indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger 11 are connected to each other. Cooling water heat exchanged with at least one of a cooling water jacket 28b and a discharged gas heat exchanger 23b is branched into a water-refrigerant heat exchanger 8 in which heat is exchanged between the cooling water and the refrigerant in the circuit 200, and into a hot water utilizing section. The cooling water is supplied there and, when a high amount of requirement is applied, a supplying amount of cooling water is increased for the floor heating device rather that for the heat exchanger 8 between water and refrigerant on the basis of the requirement of heating operation from the detecting means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an engine-driven heat pump device used as a heating device.

[0002]

2. Description of the Related Art An engine-driven heat pump device that uses an engine as a drive source of a heat pump is used as a heating device. For example, a part of engine waste heat during heating is recovered in a refrigerant circuit to increase heating efficiency. Some use part of engine waste heat for hot water use.

[0003]

However, there has been no clarification on how to supply the engine waste heat for the recovery to the refrigerant circuit and for the use of hot water.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to supply engine waste heat appropriately in a heating operation state and a hot water utilization state. In addition, when the heating request is high, such as immediately after the operation of the heating device, the heating request can be satisfied quickly. Another object of the present invention is to effectively prevent frost formation by utilizing engine waste heat when the outdoor heat exchanger is frosted.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems and achieve the object, the invention according to claim 1 is characterized in that "a part of the engine waste heat during heating is recovered in a refrigerant circuit,
In an engine-driven heat pump device that uses part of the engine waste heat for hot water use, a floor heating device is installed in a room where an indoor heat exchanger is arranged as a hot water use unit, and heating is performed by a compressor driven by the engine. A refrigerant circuit for circulating a refrigerant from a compressor in the order of an indoor heat exchanger, an expansion valve, an outdoor heat exchanger, and a compressor, and exchanges heat with at least one of an engine cooling water jacket of the engine and an exhaust gas heat exchanger. The cooling water is branched and supplied to the water-refrigerant heat exchanger that exchanges heat between the cooling water and the refrigerant in the refrigerant circuit and the hot water utilization unit, Based on the heating demand, when the heating demand becomes large,
In preference to the supply of the cooling water to the water-refrigerant heat exchanger,
An engine-driven heat pump device, wherein a supply amount of the cooling water to the floor heating device is increased. When the demand for heating increases, the floor heating can be started quickly by increasing the supply of cooling water to the floor heating device in preference to the supply of cooling water to the water-refrigerant heat exchanger. Can be raised. Also, floor heating has higher responsiveness than raising room temperature, and even if the rise in room temperature is small, only the floor temperature rises and a person in the room can feel warmth.

According to a second aspect of the present invention, there is provided an apparatus for detecting a floor heating state, wherein after the floor heating state matches the floor heating request,
The engine-driven heat pump device according to claim 1, wherein the supply of the cooling water to the water-refrigerant heat exchanger is increased in accordance with a heating request while maintaining a floor heating state. ] In addition to the effect of the invention of claim 1,
An effective heating effect can be obtained by increasing the room temperature.

According to a third aspect of the present invention, there is provided an engine-driven heat pump device which recovers a part of engine waste heat during heating to a refrigerant circuit and uses a part of engine waste heat for hot water use. A water supply device or a heating device other than the floor heating device of the room in which the indoor heat exchanger is disposed is provided, and during the heating operation by the compressor driven by the engine, the refrigerant flows from the compressor to the indoor heat exchanger, the expansion valve, An outdoor heat exchanger and a refrigerant circuit that circulates in the order of the compressor are provided.The cooling water that has exchanged heat with at least one of the engine cooling water jacket and the exhaust gas heat exchanger of the engine is formed by the cooling water and the refrigerant in the refrigerant circuit. The water-refrigerant heat exchanger that exchanges heat between the hot water utilization section and the hot water utilization section. Based on, as the heating demand is large,
An engine-driven heat pump device, wherein the supply amount of the cooling water to the water-refrigerant heat exchanger is increased. ], And takes precedence over the hot water request of the hot water utilization department,
As the heating demand increases, the room temperature can be raised earlier by increasing the supply amount of the cooling water to the water-refrigerant heat exchanger.

According to a fourth aspect of the present invention, there is provided a method for detecting a frost on the outdoor heat exchanger, wherein when the frost is formed, the supply amount of the cooling water based on a heating request from the heating request detecting means is further determined. The engine-driven heat pump device according to any one of claims 1 to 3, wherein the increased amount of the cooling water is supplied to the water-refrigerant heat exchanger. In addition to the effects of the first to third aspects of the present invention, it is possible to prevent frost formation on the outdoor heat exchanger while quickly satisfying the heating requirement.

According to a fifth aspect of the invention, when one or both of the heating request and the hot water use request become large,
The engine-driven heat pump device according to any one of claims 1 to 4, wherein the amount of fuel supplied to the engine is increased and / or the ignition timing is advanced. Claims 1 to 3
In addition to the effects of the invention, it is possible to quickly satisfy the heating demand.

[0010]

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 configuration of an outdoor unit of an engine-driven heat pump device, and FIG. 2 is a diagram showing the configuration of an indoor unit of an engine-driven heat pump device.

The engine-driven heat pump device 1 includes an outdoor unit 2 and an indoor unit 3.

As shown in FIG. 2, the indoor unit 3 includes an indoor heat exchanger 41 for refrigerant, an electronic expansion valve 42 for reducing pressure, and a blower fan 44 for indoor heat exchange in each room R. . Further, each room R is provided with an indoor temperature sensor 43 and a remote control operation section 87. In some room R,
A floor heating device 85 is provided as a hot water utilization unit,
Floor heating temperature sensor 85 constituting floor heating state detecting means
a is provided. In another room R, a water supply device 86 is provided as a hot water utilization unit, and in another room R, a heating device 88 is provided.

As shown in FIG. 1, the outdoor unit 2 is provided with an engine 5, compressors 6, 6 and the like, and further includes a main accumulator (hereinafter, also referred to as a water-refrigerant heat exchanger, that is, an exhaust heat recovery device). 8, a sub-accumulator 9, an outdoor heat exchanger 11 for a refrigerant, a hot water heat exchanger 13, and the like. The hot water heat exchanger 13 is provided with a cooling fan 13a.

A water-cooled gas fuel engine is used as the engine 5, and a gas mixer 21b and an air cleaner 21c are connected to an intake passage of the engine 5 via an intake pipe 21a. The gas mixer 21b is connected to a gas fuel source by a fuel line 22, and the gas line 21b is connected to the fuel line 22.
A flow control valve 22a, a zero governor (reducing valve) 22b, and a solenoid valve 22c are provided, and are connected to a fuel gas cylinder.

An exhaust passage of the engine 5 is connected to an exhaust gas heat exchanger 23b, an exhaust silencer 23c, and a mist separator 23d via an exhaust pipe 23a. Drain water generated in the exhaust gas heat exchanger 23b, the exhaust silencer 23c and the mist separator 23d is discharged to the neutralizer 23e. The engine 5 has a lubricating oil tank 24a.
When the amount of lubricating oil decreases, the solenoid valve 24b opens, and lubricating oil is supplied by gravity.

The output shaft 5a of the engine 5 has a clutch 6
The compressors 6 and 6 arranged in the refrigerant circuit 200 are connected via a and 6a. The outlet of the compressor 6 is connected to the outdoor heat exchanger 11 for the refrigerant via the refrigerant line 16a, the four-way valve 15 in which the ports 15a and 15c are communicated and switched to the heating operation position, and the refrigerant line 16b. The outdoor heat exchanger 11 for the refrigerant is connected to the electronic expansion valve 42 disposed in the indoor unit 3 shown in FIG. , Is connected to an indoor heat exchanger 41 for refrigerant. The refrigerant pipes 17a to 17c are connected by a joint 100, and a dryer 101 and a switching valve 102 are arranged in the refrigerant pipe 17a.

The refrigerant indoor heat exchanger 41 is disposed in the outdoor unit 2 shown in FIG. 1 through refrigerant pipes 17d to 17f, and is connected to the ports 15d and 15b so as to be switched to the heating operation position. It is connected to the suction ports of the compressors 6, 6 via a valve 15, a refrigerant line 16d, a main accumulator 8, a refrigerant line 16e, a sub-accumulator 9, and a refrigerant line 16f. The refrigerant pipes 17d to 17f are connected by a joint 110, and the refrigerant pipe 17f has a switching valve 1
11 are arranged.

A capillary tube 900 is arranged in the refrigerant line 16e, and 910 and 910 are each a combination of a temperature detector and a capillary tube, and detect the refrigerant temperature to detect the level of the liquid-phase refrigerant in the main accumulator 8. This is for detecting. Reference numeral 911 denotes an on-off valve, and 912 denotes an oil discharge passage. When the amount of oil stored in the lower part of the accumulator increases, the on-off valve 9 is operated manually or automatically.
11 is opened to allow the oil to flow from the main accumulator 8 to the sub-accumulator 9.

An oil separator 19a for separating the lubricating oil in the refrigerant is provided in the middle of the refrigerant line 16a. When the amount of the lubricating oil separated by the oil separator 19a exceeds a predetermined value, the oil strainer 19b Is returned to the refrigerant pipe 16f on the suction port side of the compressors 6, 6. The refrigerant line 16a is connected to the oil strainer 20.
a, It is connected to the refrigerant line 16d on the main accumulator 8 side via an electromagnetic valve 20b that opens when the pressure in the tube is equal to or higher than a predetermined pressure, thereby avoiding an abnormal rise in the refrigerant line pressure.

An electromagnetic valve 90 and an oil strainer 91 are arranged in the refrigerant line 16g connected between the refrigerant line 16d and the refrigerant line 16c.
When the load of (1) becomes particularly small, the solenoid valve 90 is opened, and the refrigerant is caused to flow to the main accumulator 8 bypassing the indoor heat exchanger 41 for the refrigerant so as to balance with the load. The high-pressure side pressure sensor 610 of the compressor 6 is arranged in the refrigerant line 16a, and the low-pressure side pressure sensor 611 of the compressor 6 is arranged in the refrigerant line 16f. At the entrance of the outdoor heat exchanger 11 for the refrigerant, an outdoor heat exchanger inlet air sensor C is arranged.

The outdoor unit 2 is provided with a cooling water circulation system.
An engine-side circulation half-way S1 including an engine cooling water jacket 28b of the engine 5, a switching valve K, and circulation passages 29a1 and 29a2 connecting these;
b, a linear three-way valve 28d, one of which is a heat exchange part 300a of the heat exchanger 300, a heat exchange part 302 in the hot water storage tank 301,
A thermostat 303, the other is a heat exchange part 29g in the water-refrigerant heat exchanger 8, a cooling water pump 28e, and circulation passages 29e1, 29e2, 29b, 29c, 2 communicating these.
9c1, 29c2, 29c3, 29f1, 29f2, 2
The heat radiation side circulation half path S2 composed of 9p is provided. 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. The communication passage 29q forms a bypass that bypasses the engine-side circulation half-way S1.

The hot water heat exchanger 13 is connected to a cooling water reservoir tank 30a via a water pipe 30c and an inlet 30b. One port of the switching valve K is also connected to the inlet 30b. The cooling water reservoir tank 30a has a water inlet 30d and a communication passage 30e between the cooling water reservoir 30a and the atmosphere.
Is provided.

The hot water storage tank 301 is connected to a water pipe 311 via a water pipe 310, and an on-off valve 312 and a check valve 313 are arranged in the water pipe 310. The hot water storage tank 301 is provided with a relief valve 314 and an on-off valve 315. The on-off valve 312 is always open, and by opening the on-off valve 315, the water pipe 3
Tap water is supplied from 10, and the hot water storage tank 301 is maintained at a predetermined water level by the relief valve 314. Check valve 31
No. 3 regulates the backflow to the water pipe 311 side when the water pressure in the hot water storage tank 301 rises.

The hot water storage tank 301 has a circulation hot water path 320
a, 320b, 321a, 321b are connected, and the room R
The hot water is circulated to the heating device 88 arranged in the heater. The circulating hot water passages 320a and 320b are connected by a joint 320c, and the circulating hot water passages 321a and 321b are connected by a joint 321c.
A supply pump 320d is disposed in the circulation hot water passage 320a.

Hot water storage tank 301 is connected with hot water supply paths 330 a and 330 b for supplying hot water, and supplies hot water to water supply device 86. Instant water heater 86a of water supply device 86
To open and close the on-off valve 86b and supply it to the bathtub, or for cooking or washing. Instant water heater 86a
It is also possible to use warm water without using such a method. The supply hot water paths 330a and 330b are connected by a joint 330c.

The heat exchanger 300 has a double-pipe structure, and the heat exchange section 300b is disposed in the floor heating circuit 340. The floor heating circuit 340 includes floor heating water passages 341a to 341.
e, and the floor heating water passages 341a and 341b
1f, and the floor heating water channels 341c and 341d are connected by a joint 341g. The floor heating device 85 is disposed in the floor heating circuit 340, and hot water is circulated by the circulation pump 342 disposed in the floor heating water passage 341d. To the floor heating circuit 340, a hot water reservoir tank 350a is connected via a hot water pipe 350b and an inlet 30b.

The indoor unit 3 includes a heat exchanger 3
Separately from 00, a water-refrigerant heat exchanger 400 is provided, and this water-refrigerant heat exchanger 400 has a double-pipe structure. The heat exchange part 400a of the water-refrigerant heat exchanger 400 is disposed in the floor heating water passage 341e, and the heat exchange part 400b is disposed in the refrigerant pipe 410, and performs heat exchange between water and refrigerant, and the temperature of hot water. To rise. One of the heat exchange units 400b is connected to the refrigerant line 17e via the refrigerant line 410a, the other is connected to the refrigerant line 17b via the refrigerant line 410b, and an on-off valve A is provided on the refrigerant line 410a. Placed,
An electronic expansion valve B is disposed in the refrigerant pipe 410b.
The floor heating circuit 340 is provided with a floor heating water channel temperature sensor D, and temperature control is performed by feeding back temperature information from the floor heating water channel temperature sensor D so that the hot water in the floor heating circuit 340 has a predetermined temperature. .

FIG. 3 is a control circuit diagram of the engine-driven heat pump device. Engine driven heat pump device 1
Has a main controller 80, an indoor unit controller 81, and an outdoor unit controller 82. The indoor unit control device 81 controls the indoor unit 3, and the outdoor unit control device 82 controls the outdoor unit 2.

The indoor unit controller 81 receives temperature information from the floor heating temperature sensor 85a and the indoor temperature sensor 43, and controls the blower fan 44 and the electronic expansion valve 42 based on a command from the remote controller 87. Room heating is performed, and information on the operation state is exchanged with main controller 80.

The outdoor unit control unit 82 exchanges information on the operating state with the main control unit 80 to operate the engine 5. Further, information from the high pressure side pressure sensor 610, the low pressure side pressure sensor 611, and other information from the sensor group F is input to the outdoor unit controller 82, and further, temperature information is input from the outdoor heat exchanger inlet air sensor C, The linear three-way valve 28d, the on-off valve A, the electronic expansion valve B, the four-way valve 15, and the other actuator group E are controlled based on the temperature information.

Next, the engine-driven heat pump device 1
The control of recovering part of the engine waste heat during heating in the refrigerant circuit 200 and using part of the engine waste heat for hot water utilization will be described with reference to FIGS. 4 to 8. 4 is a control flowchart of heating, FIG. 5 is a diagram showing a relationship between a heating temperature and a target pressure, FIG. 6 is a diagram illustrating output characteristics of a linear three-way valve, FIG. 7 is a control flowchart of floor heating, and FIG. It is a figure explaining the relation between a set temperature and a floor heating set temperature.

The engine-driven heat pump device 1 includes:
A floor heating device 85 of the room R in which the indoor heat exchanger 41 is disposed as a hot water utilization unit is provided. During the heating operation by the compressors 6 and 6 driven by the engine 5, the refrigerant exchanges indoor heat with the compressors 6 and 6. Alarm 41, electronic expansion valve 42, outdoor heat exchanger 11
Further, a refrigerant circuit 200 that circulates in the order of the compressors 6 and 6 is provided. Then, the cooling water that has exchanged heat with at least one of the engine cooling water jacket 28b of the engine 5 and the exhaust gas heat exchanger 23b is separated from the cooling water and the refrigerant circuit 200.
A water-refrigerant heat exchanger 8 for exchanging heat with the refrigerant therein;
A linear three-way valve 2 is connected to the floor heating device 85, which is a hot water utilization unit.
The opening of 8d is controlled, and the supply is branched off by this control.

In the control for using a part of the engine waste heat for the use of hot water, in the main flow of FIG. 4A, an allowance for exhaust heat is checked in step a1, and the opening of the linear three-way valve 28d is determined in step a2. The opening degree of the linear three-way valve 28d is controlled based on the calculation result (step a).
3).

The exhaust heat allowance check is performed according to the flow shown in FIG. That is, in step b1, it is determined whether or not the heating operation is being performed. When the heating operation is not being performed, the process ends without performing the exhaust heat allowance check. In the case of the heating operation, in Step b2, the high pressure Pd obtained from the high pressure sensor 610 is changed to the target pressure Pd_m.
If the target pressure is not the target pressure Pd_m, the control is being performed, and the exhaust heat allowance check ends.

As shown in FIG. 5, the comparison between the high pressure Pd and the target pressure Pd_m is based on the target pressure Pd at the temperature difference Δt between the indoor set temperature Tin-m and the indoor temperature Tin-r.
Judgment is made based on whether or not _m is within the range of the pressure Pd_m + 1, that is, the value obtained by adding 1 atm to the pressure Pd_m and the value obtained by subtracting 1 atm from the pressure Pd_m-1. High pressure P
If d is in the range of the target pressure Pd_m plus or minus 1 atm, it is determined in step b3 whether or not the rotational speeds of the compressors 6 and 6 are maximum. If the rotational speeds of the compressors 6 and 6 are the maximum, the process ends. If the rotational speeds are not the maximum, it is determined that there is a margin for exhaust heat and the process ends (step b4).

The opening degree of the linear three-way valve 28d, which can be opened and closed by 1.8 ° per step and can take an opening degree of any step between the 0 step position and 100 steps, is calculated as shown in FIG. It is done by flow. That is, in step c1, it is determined whether or not there is a margin for the exhaust heat. The control opening is obtained by comparing with. As shown in FIG. 6, when the opening degree is 0 degree, the flow rate of hot water I1 to use hot water is 100%, and the flow rate of hot water I2 to the refrigerant circuit 200 is 0%, as shown in FIG. When the opening degree is 180 degrees, the hot water flow rate I1 for hot water use is 0% and the refrigerant circuit 20
The output is such that the hot water flow rate I2 to 0 is 100%.

After the control opening is obtained, in step c3, it is determined whether or not frost is attached to the refrigerant outdoor heat exchanger 11 based on the temperature information from the outdoor heat exchanger inlet air sensor C. If no frost has adhered, the control opening is obtained by adding 100 steps to the current opening, so that the flow rate I1 of hot water to use the hot water becomes 100%.

Next, control of floor heating will be described with reference to FIGS.

In step a, it is determined whether or not the floor heating operation is to be performed. If the floor heating operation is not to be performed, the process ends without performing the exhaust heat allowance check. In the case of the floor heating operation, a floor heating set temperature is set in step b based on a heating request from a remote control operation section 87 which is a heating request detecting means, and the target floor temperature T and the floor heating temperature sensor 85 are set.
Then, the temperature difference ΔT is calculated by comparing the bed temperature from “a”. Further, the floor heating set temperature by the heating request detection means can be automatically set based on the room temperature set temperature based on a map as shown in FIG. Also, the floor heating set temperature may be set independently of the room temperature set temperature.

If the ratio of the temperature difference ΔT to the target bed temperature T is smaller than the constant a of a <b in step c, the process proceeds to step d to close the on-off valve A and fully close the electronic expansion valve B. In the water-refrigerant heat exchanger 400, no heat exchange is performed. Then, the high pressure Pd obtained from the high pressure side pressure sensor 610 is compared with the target pressure Pd_m (step e). If the target pressure is not Pd_m, the control is in progress and the exhaust heat allowance check ends.

The comparison between the high pressure Pd and the target pressure Pd_m is such that the target pressure Pd_m is equal to the pressure Pd_m + 1 atmosphere and the pressure Pd_m.
The determination is made based on whether or not the pressure is within a range of d_m-1 atm. When the high pressure Pd is equal to the target pressure Pd_m, it is determined in step f whether or not the rotational speeds of the compressors 6 and 6 are maximum. If the rotational speeds of the compressors 6 and 6 are the maximum, the process is terminated. If not, it is determined that there is a margin for exhaust heat and the process is terminated (step g).

If the ratio between the temperature difference ΔT and the target floor temperature T is larger than the constant a of a <b in step c, the process proceeds to step h, where the ratio between the temperature difference ΔT and the target floor temperature T becomes If it is smaller than the constant b, the on-off valve A is closed, the electronic expansion valve B is fully closed, and the process is terminated assuming that there is room for exhaust heat (step g).

When the ratio between the temperature difference ΔT and the target bed temperature T is larger than the constant b in step h, the on-off valve A is closed, the electronic expansion valve B is set to the set opening degree, and the heat between water and refrigerant is set. The heat exchange is performed in the exchanger 8, and the process is terminated as there is room for exhaust heat (step g).

As described above, when the heating request is increased by the control of the linear three-way valve 28d based on the heating request from the remote control operating section 87 as the heating request detecting means, the cooling water to the water-refrigerant heat exchanger 8 is supplied. Floor heating device 85
By increasing the supply of cooling water to the floor, floor heating can be started up quickly. Also, rather than raising the room temperature,
Floor heating is more responsive, and even if the rise in room temperature is small,
Just by raising the floor temperature, it is possible to make the humans in the room feel warmth.

Further, a floor heating temperature sensor 85a as floor heating state detecting means is provided. After the floor heating state matches the floor heating request, the floor heating state is maintained by controlling the linear three-way valve 28d, and the heating request is maintained. Water-refrigerant heat exchanger 8 according to
In addition to increasing the supply of cooling water to the floor, the floor heating is started more quickly, and an effective heating effect can be obtained by increasing the room temperature.

Further, the indoor heat exchanger 41 is used as a hot water utilization section.
Water supply device 86 other than the floor heating device 85 of the room R in which
Alternatively, a heating device 88 is provided, and the cooling water that has exchanged heat with at least one of the engine cooling water jacket 28b and the exhaust gas heat exchanger 23b of the engine 5 is cooled by the cooling water and the refrigerant circuit 2.
Water-refrigerant heat exchanger 8 for exchanging heat with the refrigerant in the heat exchanger 00
And the water is supplied to the hot water utilization section. The higher the heating request is, the higher the heating request is based on the heating request from the remote control operating section 87 which is the heating request detecting means, in preference to the warm water request from the hot water utilization section. -The room temperature can be quickly raised by increasing the supply amount of the cooling water to the inter-refrigerant heat exchanger 8.

Further, when frost formation on the outdoor heat exchanger 11 is detected,
In the frosted state, the cooling water supplied from the water-refrigerant heat exchanger 8 is further increased from the supply amount of the cooling water by controlling the linear three-way valve 28d based on the heating request from the remote control operation unit 87 as the heating request detecting means. To the above, in addition to the above effects,
In order to satisfy the heating demand quickly, the outdoor heat exchanger 11
Frost can be prevented.

When one or both of the heating request and the hot water use request are large, the fuel supply to the engine 5 is increased, and the ignition timing is advanced to one or both of the above. In addition to the effect, it is possible to quickly meet the heating requirements.

[0050]

As described above, according to the first aspect of the present invention, a floor heating device for a room in which an indoor heat exchanger is provided as a hot water utilization unit is provided, and an engine cooling water jacket of an engine and an exhaust gas heat exchanger are provided. The cooling water that has exchanged heat with at least one of the cooling water is branched and supplied to a water-refrigerant heat exchanger that exchanges heat between the cooling water and the refrigerant in the refrigerant circuit and the hot water utilization unit, and a heating request is provided. Based on the heating request from the detection means, when the heating request is large, by giving priority to the supply of the cooling water to the water-refrigerant heat exchanger, by increasing the supply amount of the cooling water to the floor heating device, Floor heating can be started up quickly. Also, floor heating has higher responsiveness than raising room temperature, and even if the rise in room temperature is small, only the floor temperature rises and a person in the room can feel warmth.

According to the second aspect of the present invention, the floor heating state detecting means is provided, and after the floor heating state matches the floor heating request,
Since the supply of the cooling water to the water-refrigerant heat exchanger is increased in response to the heating request while maintaining the floor heating state, an effective heating effect is obtained by increasing the room temperature in addition to the effect of the invention of claim 1. can get.

According to the third aspect of the present invention, a water supply device or a heating device other than a floor heating device in a room provided with an indoor heat exchanger is provided as a hot water utilization portion, and an engine cooling water jacket of an engine and an exhaust gas heat exchanger are provided. The cooling water that has exchanged heat with at least one of the cooling water and the coolant in the refrigerant circuit is branched and supplied to a water-refrigerant heat exchanger that exchanges heat between the cooling water and the refrigerant in the refrigerant circuit, and is supplied to the hot water using unit. Prior to the hot water request, based on the heating request from the heating request detecting means, the larger the heating request, the faster the room temperature is increased by increasing the supply amount of the cooling water to the water-refrigerant heat exchanger. Can be done.

According to the fourth aspect of the present invention, the frost formation of the outdoor heat exchanger is detected, and in the frosted state, the cooling amount is further increased from the supply amount of the cooling water based on the heating request from the heating request detecting means. By supplying water to the water-refrigerant heat exchanger, in addition to the effects of the first to third aspects of the present invention, it is possible to prevent frost formation on the outdoor heat exchanger while quickly satisfying the heating requirement. .

According to the fifth aspect of the present invention, when one or both of the heating request and the hot water use request increase, the fuel supply amount to the engine is increased, and the ignition timing is advanced and / or performed. By doing so, in addition to the effects of the inventions of claims 1 to 3, it is possible to quickly satisfy the heating demand.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a configuration of an indoor unit of an engine-driven heat pump device.

FIG. 3 is a control circuit diagram of the engine-driven heat pump device.

FIG. 4 is a control flowchart of heating.

FIG. 5 is a diagram showing a relationship between a heating temperature and a target pressure.

FIG. 6 is a diagram illustrating output characteristics of a linear three-way valve.

FIG. 7 is a control flowchart of floor heating.

FIG. 8 is a diagram illustrating a relationship between a room temperature set temperature and a floor heating set temperature.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine drive type heat pump apparatus 5 Engine 6 Compressor 8 Water-refrigerant heat exchanger 11 Outdoor heat exchanger 28b Engine cooling water jacket 41 Indoor heat exchanger 42 Electronic expansion valve 85 Floor heating device 200 Refrigerant circuit R Room

Claims (5)

[Claims] 1. An engine driven heat pump device for recovering a part of the engine waste heat during heating to a refrigerant circuit and using a part of the engine waste heat for hot water use, wherein an indoor heat exchanger is provided as a hot water use part. A floor heating device is provided in the installed room, and a refrigerant circuit for circulating refrigerant from the compressor to the indoor heat exchanger, the expansion valve, the outdoor heat exchanger, and the compressor in the order of heating during the heating operation by the compressor driven by the engine. A water-refrigerant heat exchanger for exchanging heat between the cooling water and the refrigerant in the refrigerant circuit, the cooling water having exchanged heat with at least one of an engine cooling water jacket and an exhaust gas heat exchanger of the engine. And the branch to the hot water utilization section, and based on the heating request from the heating request detecting means, when the heating request is large, priority is given to the supply of the cooling water to the water-refrigerant heat exchanger. hand, Engine driving type heat pump apparatus which is characterized in that so as to increase the supply amount of the cooling water to the Kiyuka heating system. 2. A floor heating state detecting means is provided, and after the floor heating state matches the floor heating request, while maintaining the floor heating state,
The supply of the cooling water to the water-refrigerant heat exchanger is increased in response to a heating request.
An engine-driven heat pump device as described in the above. 3. An engine-driven heat pump device for recovering a part of the engine waste heat during heating to a refrigerant circuit and using a part of the engine waste heat for hot water use, wherein an indoor heat exchanger is provided as a hot water use part. A water supply device or heating device other than the floor heating device of the installed room is provided, and during the heating operation by the compressor driven by the engine, the refrigerant flows from the compressor to the indoor heat exchanger, the expansion valve, the outdoor heat exchanger, and the compressor. A coolant circuit that circulates heat in at least one of the engine cooling water jacket and the exhaust gas heat exchanger of the engine, and heat exchanges heat between the cooling water and the refrigerant in the refrigerant circuit. The supply is branched and supplied to the inter-refrigerant heat exchanger and the hot water utilization unit, and the heating request is large based on the heating request from the heating request detection unit prior to the hot water request of the hot water utilization unit. That enough water - engine driving type heat pump apparatus being characterized in that so as to increase the supply amount of the cooling water to the refrigerant heat exchanger. 4. The method according to claim 1, wherein the frost formation of the outdoor heat exchanger is detected, and when the frost formation state is reached, the cooling water supplied from the heating request detection means is further increased in amount than the cooling water supply amount based on the heating request. 4. The engine-driven heat pump device according to claim 1, wherein the heat pump is supplied to a water-refrigerant heat exchanger. 5. When one or both of the heating request and the hot water use request become large, the fuel supply amount to the engine is increased and the ignition timing is advanced, and / or the ignition timing is advanced. The engine-driven heat pump device according to any one of claims 1 to 4, wherein