Gas engine heat pump

Abstract

The present invention relates to a gas engine heat pump comprising: an engine that combusts a mixture of air and fuel; a first exhaust passage connected to the engine such that exhaust gas discharged from the engine passes through and is discharged to the outside; a turbocharger including a first compressor that compresses the mixture and supplies it to the engine, and a first turbine installed in the first exhaust passage to receive the exhaust gas passing through the first exhaust passage and drive the first compressor; a supercharger installed in the first exhaust passage between the engine and the first turbine, which receives the exhaust gas passing through the first exhaust passage, compresses it, and supplies it to the first turbine; a second exhaust passage branching off from the first exhaust passage between the engine and the supercharger and joining with the first exhaust passage between the supercharger and the first turbine; and a first valve installed in the second exhaust passage to be openable and closable. It includes a third exhaust passage branched from the first exhaust passage between the supercharger and the first turbine and joined to the first exhaust passage downstream of the first turbine; a second valve installed to be openable and closable in the third exhaust passage; and a control unit that controls the operation of the first valve, the second valve, and the supercharger according to the load of the engine.

Description

Technology Field

[0001] The present invention relates to a gas engine heat pump, and more specifically, to a gas engine heat pump that improves engine output by double supercharging exhaust gas generated by combustion of the engine. Background Technology

[0002] Generally, a heat pump refers to a device that cools or heats an indoor space through the compression, condensation, expansion, and evaporation processes of a refrigerant. When cooling an indoor space, the indoor heat exchanger functions as an evaporator through which low-temperature, low-pressure refrigerant passes, while the outdoor heat exchanger functions as a condenser through which high-temperature, high-pressure refrigerant passes. Conversely, when heating an indoor space, the indoor heat exchanger functions as a condenser, and the outdoor heat exchanger functions as an evaporator.

[0003] Heat pumps can be broadly classified into electric heat pumps (EHP), which drive a compressor using an electric motor, and gas engine heat pumps (GHP), which drive a compressor using the combustion energy of fuel gas.

[0004] The above gas engine heat pump includes an engine that generates power using a mixture of fuel and air (hereinafter referred to as a mixture). For example, the engine may include an engine cylinder to which the mixture is supplied, and a piston provided to be movable within the cylinder.

[0005] The above gas engine heat pump may include an air supply device for supplying air and fuel, a fuel supply device, and a mixer for mixing the air and fuel.

[0006] The air supply device may include an air filter for purifying air. Additionally, the fuel supply device may include a zero governor for supplying fuel at a constant pressure. The air passing through the air filter and the fuel discharged from the zero governor may be mixed in the mixer (mixer) and supplied to the engine.

[0007] Meanwhile, the mixture that has passed through the above mixer can be supplied to the above engine after undergoing supercharging action by a supercharger. Representative examples of the above supercharger include a supercharger and a turbocharger.

[0008] The mixture flowing into the engine through the aforementioned supercharger passes through the intake manifold and is supplied to each of the multiple engine cylinders formed in the engine. Then, inside the multiple engine cylinders, the mixture undergoes a combustion reaction, and the thermal energy generated by the combustion reaction is converted into mechanical energy to drive the compressor.

[0009] The exhaust gas generated by the combustion reaction of the mixture in the above engine can pass through the exhaust manifold, then pass through the exhaust gas heat exchanger and be cooled by the coolant, and then pass through the muffler to be discharged to the outside of the gas engine heat pump.

[0010] Meanwhile, recently, in addition to technology for precisely adjusting the output of the above-mentioned engine, technology for improving the output of the engine is also required as the load required of the engine is increasingly growing. The problem to be solved

[0011] The problem that the present invention aims to solve is to provide a gas engine heat pump including a structure capable of further improving the output of the engine.

[0012] Another problem that the present invention aims to solve is to provide a gas engine heat pump capable of adjusting the engine output more precisely in stages.

[0013] The problems of the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0014] To achieve the above objective, a gas engine heat pump according to an embodiment of the present invention comprises: an engine that combusts a mixture of air and fuel; a first exhaust passage connected to the engine such that exhaust gas discharged from the engine passes through and is discharged to the outside; a first compressor that compresses the mixture and supplies it to the engine; a turbocharger including a first turbine installed in the first exhaust passage to receive exhaust gas passing through the first exhaust passage and drive the first compressor; a supercharger installed in the first exhaust passage between the engine and the first turbine, which receives exhaust gas passing through the first exhaust passage, compresses it, and supplies it to the first turbine; a second exhaust passage branched from the first exhaust passage between the engine and the supercharger and joined to the first exhaust passage between the supercharger and the first turbine; a first valve installed in the second exhaust passage to be openable and closable; and a first exhaust passage branched from the first exhaust passage between the supercharger and the first turbine It includes a third exhaust passage connected to the first exhaust passage downstream of the turbine, a second valve installed to be openable and closable in the third exhaust passage, and a control unit that controls the operation of the first valve, the second valve, and the supercharger according to the load of the engine.

[0015] The above control unit can open the first valve and the second valve when the engine load has a value within the first load condition or the second load condition.

[0016] The control unit can fully open the opening rate of the second valve when the load of the engine has a value within the first load condition, and open the first valve and the second valve when the load of the engine has a value within the second load condition, while adjusting the opening rate of the second valve according to the load of the engine.

[0017] The control unit can open the first valve and close the second valve when the load of the engine has a value within the third load condition.

[0018] The above control unit can drive the supercharger when the load of the engine has a value within the fourth load condition or the fifth load condition.

[0019] The control unit can close the first valve if the load of the engine has a value within the fourth load condition or the fifth load condition.

[0020] The control unit above opens the second valve when the load of the engine has a value within the fourth load condition, and can adjust the opening rate of the second valve according to the load of the engine.

[0021] The above control unit can close the second valve when the load of the engine has a value within the fifth load condition.

[0022] The above gas engine heat pump may further include an exhaust gas heat exchanger installed in the first exhaust passage to cool the exhaust gas discharged from the engine.

[0023] The exhaust gas heat exchanger can be installed downstream of the first turbine.

[0024] Specific details of other embodiments are included in the detailed description and drawings. Effects of the invention

[0025] According to the gas engine heat pump of the present invention, one or more of the following effects are present.

[0026] First, since the supercharger can compress and supply exhaust gases emitted from the engine to the turbocharger's turbine, it has the advantage of further improving engine output.

[0027] Second, the operation of the first valve, the second valve, and the supercharger can be controlled according to the engine load, thereby controlling the engine output more precisely, and

[0028] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0029] FIG. 1 is a schematic diagram of a gas engine heat pump system according to an embodiment of the present invention. FIG. 2 is a block diagram of the control configuration of the gas engine heat pump of the present invention. Figure 3 shows a schematic diagram of increasing engine output through stepwise control as the engine load of the gas engine heat pump of the present invention increases. Figure 4 is a control flowchart for the gas engine heat pump of the present invention. FIG. 5 is a schematic diagram of a gas engine heat pump according to one embodiment of the present invention. FIG. 6 is a schematic diagram of a gas engine heat pump according to another embodiment of the present invention. FIG. 7 shows a schematic diagram of a gas engine heat pump according to another embodiment of the present invention. FIG. 8 shows a schematic diagram of a gas engine heat pump according to another embodiment of the present invention. FIG. 9 shows a schematic diagram of a gas engine heat pump according to another embodiment of the present invention. Specific details for implementing the invention

[0030] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0031] Spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used to facilitate the description of the relationship between one component and another, as illustrated in the drawings. Spatially relative terms should be understood as encompassing different orientations of the component during use or operation, in addition to the orientations depicted in the drawings. For example, if a component depicted in a drawing is inverted, a component described as "below" or "beneath" of another component may be placed "above" of that other component. Therefore, the exemplary term "below" may encompass both the lower and upper directions. Components may also be oriented in other directions, and accordingly, spatially relative terms may be interpreted according to the orientation.

[0032] The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, and / or actions to the mentioned components, steps, and / or actions.

[0033] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0034] In the drawings, the thickness or size of each component is exaggerated, omitted, or schematically depicted for the convenience and clarity of explanation. Additionally, the size and area of ​​each component do not entirely reflect their actual size or area.

[0035] Hereinafter, the present invention will be described with reference to the drawings for explaining the gas engine heat pump of the present invention by way of embodiments of the present invention.

[0037] Referring to FIG. 1 below, the gas engine heat pump according to the present invention includes an engine (5) that drives a compressor (not shown) by burning a mixture of air and fuel.

[0038] The above fuel and air can be supplied through a fuel supply device and an air supply device, respectively. And, the supplied fuel and air can be mixed in a mixer through a mixer (1).

[0039] The above air supply device may include an air filter (2) for purifying air. Additionally, the above air supply device may include a silencer (3) for reducing noise caused by air inflow. Furthermore, the above fuel supply device may include a zero governor (not shown) for supplying fuel at a constant pressure.

[0040] Meanwhile, the gas engine heat pump of the present invention includes a turbocharger (4) that compresses the mixture discharged after air and fuel are mixed in the mixer (1) and supplies it to the engine (5). The turbocharger (4) can compress the air and fuel in the mixer (1) to a pressure higher than atmospheric pressure by adjusting the rotational speed.

[0041] The turbocharger (4) may include a first compressor (4b) that compresses the mixture and introduces it into the engine (5), and a first turbine (4a) that receives exhaust gas discharged from the engine (5) and drives the first compressor (4b). The first compressor (4b) may be positioned upstream of the engine (5) and connected to the intake side of the engine (5). The first turbine (4a) may be positioned downstream of the engine (5) and receive exhaust gas from the engine (5).

[0042] Meanwhile, the above gas engine heat pump may include a control means (6). For example, the control means (6) may be equipped with a valve to which an electronic throttle control (ETC) method is applied. Fuel and air are mixed in a mixer (1) and can be pressurized to a high pressure in a turbocharger (4), which is a supercharging means. Subsequently, as the opening degree of the control means (6) is adjusted, the amount of the mixture can be adjusted and supplied to the engine (5).

[0043] Meanwhile, the exhaust passage connected downstream of the engine (5) is branched into multiple passages, and thus, the exhaust gas discharged from the engine (5) can flow through the multiple passages.

[0044] Specifically, the gas engine heat pump of the present invention may include a first exhaust passage (21) connected to the engine (5) so that exhaust gas discharged from the engine passes through and is discharged to the outside. Additionally, the gas engine heat pump may include a second exhaust passage (22) and a third exhaust passage (23), which are bypass passages branching from the first exhaust passage (21).

[0045] Meanwhile, the gas engine heat pump of the present invention includes a supercharger (7) that receives exhaust gas discharged from the engine, compresses it, and supplies it to the first turbine (4a) of the turbocharger (4). The supercharger (7) may include a second compressor (7b) that receives and compresses exhaust gas, and a motor (7a) that drives the compressor (7b).

[0046] The first turbine (4a) of the turbocharger (4) is installed inside the first exhaust passage (21) and can drive the first compressor (4b) by receiving exhaust gas discharged from the engine (5) and passing through the first exhaust passage (21).

[0047] Additionally, the supercharger (7) is installed in the first exhaust passage (21) to compress and supply exhaust gas to the first turbine (4a). Specifically, the second compressor (7b) of the supercharger (7) is installed in the first exhaust passage (21) between the engine (5) and the first turbine (4a), and the second compressor (7b) receives exhaust gas passing through the first exhaust passage (21), compresses it, and supplies it to the first turbine (4a).

[0048] That is, the first exhaust passage (21) is connected to the exhaust side of the engine (5) and can discharge exhaust gas emitted from the engine (5) to the outside. Also, the supercharger (7) and the first turbine (4a) can be installed in sequence inside the first exhaust passage (21).

[0049] Meanwhile, the second exhaust passage (22) may be branched from the first exhaust passage (21) between the engine (5) and the supercharger (7), and may be joined to the first exhaust passage (21) between the supercharger (7) and the first turbine (4a). At this time, a first valve (11) may be installed in the second exhaust passage (22) to be openable and closable.

[0050] Additionally, the third exhaust passage (23) branches off from the first exhaust passage (21) between the supercharger (7) and the first turbine (4a), and can be joined again to the first exhaust passage (21) downstream of the first turbine (4a). At this time, a second valve (12) can be installed in the third exhaust passage (23) to be openable and closable.

[0051] Meanwhile, the control unit (30, see FIG. 2) can control the operation of the first valve (11), the second valve (12), and the supercharger (7) according to the load of the engine (5). At this time, the opening and closing status and the opening rate of the first valve (11) and the second valve (12) can be controlled by the control unit (30). Also, the supercharger (7) can have the operation of the motor (7a) and the compressor (7b) and the rotational speed of the motor (7a) controlled by the control unit (30). A detailed description of the control will be provided later.

[0052] The temperature of the mixture entering the engine (5) is affected not only by the pressure of the mixture but also by the heat generated by the rotation of the supercharger. Assuming that a mixture of the same pressure is introduced into the engine, the present invention double-supercharges the exhaust side, so the influence of the heat from the supercharger is less than that of double-supercharges the intake side, and thus the temperature of the mixture entering the engine can be lowered relatively, and the deletion of the intercooler (not shown) configuration for cooling the mixture can be considered.

[0054] Meanwhile, the gas engine heat pump of the present invention may include an exhaust gas heat exchanger (8) for cooling exhaust gas discharged from an engine (5). Cooling water that exchanges heat with the exhaust gas may flow through the exhaust gas heat exchanger (8). The exhaust gas may pass through the exhaust gas heat exchanger (8) and be discharged to the outside in a cooled state. In order to reduce noise when the exhaust gas is discharged to the outside, the gas engine heat pump may further be equipped with a muffler (not shown).

[0055] The above coolant can pass through the outdoor heat exchanger (81), exchange heat with the refrigerant circulating through the outdoor heat exchanger (81), and be supplied into the exhaust gas heat exchanger (8) by the coolant pump (83). A blower fan (82) that circulates air to discharge the heat of the outdoor heat exchanger (81) to the outside may be provided on the side of the outdoor heat exchanger (81). The coolant that has passed through the exhaust gas heat exchanger (8) can lower the heat of the engine (5) by passing through the engine (5) and then circulating back to the outdoor heat exchanger (81).

[0056] Meanwhile, if the exhaust gas is cooled before passing through the supercharger (7) and the first turbine (4a), the kinetic energy of the exhaust gas particles is reduced, which may reduce the driving efficiency of the turbocharger (4). Therefore, to prevent this, the exhaust gas heat exchanger (8) may be installed downstream of the first turbine (4a).

[0058] Referring to FIG. 2 below, the control unit (30) is connected to at least one of the engine (5), the control means (6), the coolant pump (83), the circulation fan (82), the first valve (11), the second valve (12), and the supercharger (7), and can control the operation of the connected components.

[0059] The control unit (30) is connected to the motor (7a) of the supercharger (7) and can control the rotational speed of the second compressor (7b) of the supercharger (7). Accordingly, the control unit (30) can control the amount of exhaust gas compressed and supplied to the first turbine (4a).

[0060] The control unit (30) is connected to the first valve (11) and can control the opening of the first valve (11). Accordingly, the control unit (30) can control the rotational speed of the first turbine (4a) by controlling the amount of exhaust gas flowing into the second exhaust passage (22) or by controlling the amount of exhaust gas flowing into the first exhaust passage (21).

[0061] The control unit (30) is connected to the second valve (12) and can control the opening of the second valve (12). Accordingly, the control unit (30) can control the rotational speed of the first turbine (4a) by controlling the amount of exhaust gas flowing into the third exhaust passage (23).

[0062] The control unit (30) can control the opening of the control means (6). The amount of high-pressure mixture supplied to the engine (5) through the control means (6) can be precisely controlled by the control unit (30).

[0063] The control unit (30) can receive information from the engine (5) regarding the current output and required output of the engine (5). To this end, the control unit (30) can be connected to the internal configuration of the engine (5), and the engine (5) may be equipped with a sensor (not shown) inside.

[0064] The control unit (30) is connected to a cooling water pump (83) to circulate cooling water. Additionally, the control unit (30) is connected to a motor (not shown) that operates a circulation fan (82), and by rotating the circulation fan (82), it can circulate air on the side of the outdoor heat exchanger (81) to release heat to the outside.

[0066] Referring to FIGS. 3 and 4 below, the gas engine heat pump of the present invention can increase or decrease the output of the engine (5) by controlling the operation of the first valve (11), the second valve (12), and the supercharger (7) by the control unit (30) according to the load of the engine. First, after the engine is driven (S10), for example, the control unit (30) can implement five levels of control according to the load of the engine (5).

[0067] Below, the load conditions of the engine (5) are defined. Reference values ​​for dividing the load conditions of the engine (5) are denoted as X1, X2, X3, and X4, and the magnitudes of the reference values ​​are X1 <X2<X3<X4의 관계를 가진다. 상기 기준값 X1, X2, X3, X4는 임의의 값을 가질 수 있다. 예를 들어, 100% 엔진 부하를 기준으로, 상기 X1, X2, X3, X4 값은 각각 20%, 40%, 60%, 80%의 값을 가질 수 있다.

[0068] At this time, the first load condition may be defined as the case where the engine load is less than X1. The second load condition may be defined as the case where the engine load is X1 or more but less than X2. The third load condition may be defined as the case where the engine load is X2 or more but less than X3. The fourth load condition may be defined as the case where the engine load is X3 or more but less than X4. The fifth load condition may be defined as the case where the engine load is X4 or more. That is, the first load condition is the lowest load condition among the load conditions of the engine95), and as the load condition of the engine progresses from the first load condition to the fifth load condition, the load condition of the engine may gradually move toward a high load condition.

[0069] After driving the engine (5) (S21), the control unit (30) can determine whether the load condition of the engine (5) has a value within any of the first to fifth load conditions. FIG. 4 illustrates a control flowchart in which, if the load condition of the engine (5) does not have a value within the first load condition (No in S21), it determines whether it has a value within the second load condition (S22); if the load condition of the engine (5) does not have a value within the second load condition (No in S22), it determines whether it has a value within the third load condition (S23); if it does not have a value within the third load condition (No in S23), it determines whether it has a value within the fourth load condition (S24); and if it does not have a value within the fourth load condition (No in S24), it determines whether it has a value within the fifth load condition. However, as this is just one example, it is obvious that the control unit (30) can determine in a single path which load condition of the engine (5) corresponds to which of the first to fifth load conditions, without sequentially determining.

[0071] Hereinafter, control according to the load conditions of each engine will be explained with reference to any one of FIGS. 5 to 9 and FIG. 4.

[0072] Referring to FIGS. 4 and 5, the control unit (30) can open the first valve (11) and the second valve (12) (S31) if the load condition of the engine (5) has a value within the first load condition (Yes in S21). Afterwards, if the operation of the engine (5) is stopped, it terminates (Yes in S40), and if it is not terminated, it can determine again whether the load condition of the engine (5) has a value within the first load condition (No in S40).

[0073] More specifically, under the first load condition, which is the lowest load condition, the second valve (12) can be fully opened. At this time, exhaust gas discharged from the engine (5) and passing through the first exhaust passage (21) is branched into the second exhaust passage (22), and flows separately into the first exhaust passage (21) and the second exhaust passage (22). Afterward, the exhaust gas is combined back into the first exhaust passage (21), then branches from the first exhaust passage (21) into the third exhaust passage (23), and flows separately into the first exhaust passage (21) and the third exhaust passage (23).

[0074] At this time, since the supercharger (7) is not operating, if the first valve (11) is closed, there may be a large resistance to the flow of exhaust gas. Therefore, the first valve (11) is opened, and at this time, the amount of exhaust gas passing through the first valve (11) may be greater than the amount of exhaust gas passing through the supercharger. The first valve (11) may also be fully opened.

[0075] Exhaust gas passing through the first exhaust passage (21) and the second exhaust passage (22) can pass through the first turbine (4a) after being combined into the first exhaust passage (21), and then being branched into the first exhaust passage (21) and the third exhaust passage (23) by the second valve (12) which is fully opened. Thus, the turbocharger (4) can be rotated to supercharge the system to suit the lowest load conditions.

[0076] Referring to FIGS. 4 and 6, the control unit (30) can open the first valve (11) and the second valve (12) when the load condition of the engine (5) has a value within the second load condition (Yes in S22). At this time, the control unit (30) can open the second valve (12) by an opening rate of y% according to the load of the engine (5). At this time, since the flow rate of exhaust gas supplied to the first turbine (4a) can be determined according to the opening rate of the second valve (12), the control unit (30) can adjust the y value according to the load condition of the engine (5) within the second load condition. And, the first valve (11) can be fully opened.

[0077] The amount of exhaust gas supplied to the first turbine (4a) is greater than when the second valve (12) is fully open. The turbocharger (4) can be rotated to supercharge to suit the second load condition, which has a higher load condition compared to the first load condition.

[0078] Referring to FIGS. 4 and FIGS. 7, the control unit (30) can open the first valve (11) and close the second valve (12) when the engine load condition has a value within the third load condition (Yes in S23). At this time, the first valve (11) can be fully opened.

[0079] In this case, the second valve (12) is closed, so the exhaust gas is not diverted to the third exhaust passage (23) and can be supplied to the first turbine (4a) through the first exhaust passage (21). That is, the entire amount of exhaust gas discharged from the engine (5) can be supplied to the first turbine (4a), so the turbocharger (4) can be rotated to supercharge to suit the third load condition, which has a higher load condition than the second load condition.

[0080] Referring to FIGS. 4 and 8, the control unit (30) can drive the supercharger (7) when the load condition of the engine (5) has a value within the fourth load condition (Yes in S24). Accordingly, the supercharger (7) can compress the exhaust gas discharged from the engine (5) and supply it to the first turbine (4a), thereby improving the supercharging function of the turbocharger (4) and the output of the engine (5). At this time, the control unit (30) can adjust the amount of exhaust gas supercharged to the first turbine (4a) by adjusting the rotational speed of the supercharger (7).

[0081] At this time, the control unit (30) can close the first valve (11). Accordingly, the exhaust gas discharged from the engine (5) is not diverted into the second exhaust path (22), and the entire amount can pass through the supercharger (7) and be supercharged to the first turbine (4a).

[0082] Additionally, the control unit (30) can open the second valve (12). At this time, the control unit (30) can adjust the opening rate of the second valve (12) to z% according to the load of the engine (5). At this time, since the flow rate of exhaust gas supplied to the first turbine (4a) can be determined according to the opening rate of the second valve (12), the control unit (30) can adjust the z value according to the load condition of the engine (5) within the second load condition.

[0083] Referring to FIGS. 4 and FIGS. 9, the control unit (30) can close both the first valve (11) and the second valve (12) if the load condition of the engine (5) does not have a value within the fourth load condition (No in S24), and the load condition of the engine has a value within the fifth load condition. That is, by not opening the second valve (12) compared to the fourth load condition, the entire amount of exhaust gas discharged from the engine (5) can be supplied to the first turbine (4a) through the supercharger (7) that is driven.

[0085] Although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above. Various modifications are possible by those skilled in the art without departing from the essence of the invention as claimed in the patent claims, and such modifications should not be understood individually from the technical spirit or perspective of the present invention. Explanation of the symbols

[0086] 1: Mixer 4: Turbocharger 4a: 1st turbine 4b: 1st compressor 5: Engine 7: Supercharger 7a: Motor 7b: Second compressor 8: Heat exchanger 11: First valve 12: Second valve 21: First exhaust passage 22: 2nd exhaust passage 23: 3rd exhaust passage

Claims

Claim 1 An engine that burns a mixture of air and fuel; a turbocharger comprising a first compressor that compresses the mixture and supplies it to the engine, and a first turbine that receives exhaust gas and drives the first compressor; a first exhaust passage connecting the engine and the first turbine; a supercharger installed in the first exhaust passage between the engine and the first turbine, which receives and compresses exhaust gas passing through the first exhaust passage and supplies it to the first turbine; a second exhaust passage branching off from the first exhaust passage between the engine and the supercharger, and joining with the first exhaust passage between the supercharger and the first turbine; a first valve installed in the second exhaust passage so as to be openable and closable; a third exhaust passage branching off from the first exhaust passage between the supercharger and the first turbine, and joining with the first exhaust passage downstream of the first turbine; and a second valve installed in the third exhaust passage so as to be openable and closable. A gas engine heat pump comprising a control unit that controls the operation of the first valve, the second valve, and the supercharger according to the load of the engine. Claim 2 In claim 1, the control unit is a gas engine heat pump that opens the first valve and the second valve when the engine load condition has a value within the first load condition or the second load condition. Claim 3 A gas engine heat pump according to claim 2, wherein the control unit fully opens the second valve when the load condition of the engine has a value within the first load condition, and opens the first valve and the second valve when the load condition of the engine has a value within the second load condition, and adjusts the opening rate of the second valve according to the load of the engine. Claim 4 A gas engine heat pump according to claim 1, wherein the control unit opens the first valve and closes the second valve when the load condition of the engine has a value within the third load condition. Claim 5 In claim 1, the control unit is a gas engine heat pump that drives the supercharger when the load condition of the engine has a value within the fourth load condition or the fifth load condition. Claim 6 In claim 5, the control unit closes the first valve when the load condition of the engine has a value within the fourth load condition or the fifth load condition, in a gas engine heat pump. Claim 7 In claim 6, the control unit opens the second valve when the load condition of the engine has a value within the fourth load condition, and the gas engine heat pump adjusts the opening rate of the second valve according to the load of the engine. Claim 8 In claim 6, the control unit closes the second valve when the load condition of the engine has a value within the fifth load condition, in a gas engine heat pump. Claim 9 A gas engine heat pump according to claim 1, further comprising an exhaust gas heat exchanger installed in the first exhaust passage to cool the exhaust gas discharged from the engine. Claim 10 In claim 9, the exhaust gas heat exchanger is a gas engine heat pump installed downstream of the first turbine.

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