KR100790830B1 - Cogeneration System and Control Method - Google Patents

Abstract

In the cogeneration system and the control method thereof according to the present invention, at least some of the power consumption devices that receive the generated power of the generator when the driving source such as the engine starts to operate receive the generated power of the generator after warming up of the driving source. Since the driving is minimized, the load on the driving source can be minimized before warming up of the driving source, thereby improving the life of the driving source, and the driving source can be warmed up quickly and stably operated.

Cogeneration System, Drive Source, Generator, Waste Heat Recovery Unit, Heat Pump Air Conditioner, Generator Switchgear

Description

Cogeneration system and control method {Electric generation air condition system and the Control method for the Same}

1 is a schematic diagram of a cogeneration system according to the prior art,

Figure 2 is a schematic view of the cooling of the cogeneration system according to the present invention,

3 is a schematic view of the heating of the cogeneration system according to the present invention,

4 is a flow chart according to the control method of the cogeneration system according to the present invention,

5 is a graph showing the low pressure of the compressor according to the operating time of the heat pump type air conditioner of the general cogeneration system.

<Explanation of symbols on main parts of the drawings>

50: drive source 51: generator switch

52 generator 55 engine cooler

60: waste heat recovery device 70: compressor

73: four-way valve 74: indoor heat exchanger

75: outdoor heat exchanger 76: indoor expansion valve

77: outdoor expansion valve 80: waste heat supply heat exchanger

85: heat sink 90: bypass flow path

94: trilateral

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cogeneration system and a control method thereof, and more particularly, to a cogeneration system and a method for controlling the cogeneration system in which the generated power of a generator is allowed to be supplied to a power consumer such as a heat pump type air conditioner after warming up the driving source.

Cogeneration systems, commonly referred to as cogeneration systems, are systems that produce power and heat simultaneously from a single energy source.

Such a cogeneration system is capable of recovering waste heat from exhaust gas or cooling water generated by power generation by driving an engine or a turbine to increase the overall thermal efficiency by 70 to 80%. In particular, it is a high-efficiency energy utilization method that utilizes the recovered waste heat a lot in cooling, heating, and hot water supply.

1 is a schematic diagram of a cogeneration system according to the prior art.

In the conventional cogeneration system, as illustrated in FIG. 1, a generator 2 for generating electric power and a driving source 10 such as an engine for driving heat and generating heat, as well as an engine 10, hereinafter referred to as an “engine” ), A waste heat recovery apparatus 20 for recovering waste heat generated by the engine 10, and a heat demand 30 for use of the waste heat of the waste heat recovery apparatus 20.

The generated electric power generated by the generator 2 is supplied to electric power consuming devices such as various lighting fixtures and heat pump type air conditioners 4 in the home.

The generator 2 and the engine 10 are installed in an engine room E of a chassis (not shown) formed separately from the heat demand 30.

The heat pump type air conditioner 4 includes a compressor 5, a four-way valve 6, an indoor heat exchanger 7, an expansion mechanism 8, and an outdoor heat exchanger 9.

The heat pump type air conditioner (4) has a refrigerant compressed by the compressor (5) during the cooling operation, the four-way valve (6), the outdoor heat exchanger (9), the expansion mechanism (8) and the indoor heat exchanger (7) As it is circulated to the compressor 5 via the four-way valve 6 in turn, the outdoor heat exchanger 9 acts as a condenser, and the indoor heat exchanger 7 acts as an evaporator to take heat of indoor air.

On the other hand, the heat pump type air conditioner (4) has the refrigerant compressed by the compressor (5) during the heating operation, the four-way valve (6), the indoor heat exchanger (7), the expansion mechanism (8) and the outdoor heat exchanger ( 9) and the four-way valve 6, in turn, circulated to the compressor 5, the outdoor heat exchanger 9 acts as an evaporator, and the indoor heat exchanger 7 acts as a condenser to heat indoor air. do.

The waste heat recovery device 20 includes an exhaust gas heat exchanger 22 that takes heat of exhaust gas discharged from the engine 10, and a cooling water heat exchanger 24 that takes heat of cooling water cooling the engine 10. It is composed of

The exhaust gas heat exchanger 22 is connected to the heat demand 30 and the first heat supply line 23, and the waste heat taken from the exhaust gas of the engine 10 is connected to the first heat supply line 23. It is delivered to the heat demand (30) through.

The cooling water heat exchanger (24) is connected to the heat demand (30) and the second heat supply line (25), and the heat taken away from the cooling water rotor cooling the engine (10) is transferred to the second heat supply line (25). It is transmitted to the heat demand 30 through.

However, the cogeneration system according to the prior art as described above, after the start of the operation of the engine 10 until the warm-up of the engine 10, that is, the initial start of the engine 10 of the engine 10 The operation is unstable and its efficiency is low. Since the generated power of the generator 2 is supplied to a power consuming device such as the heat pump type air conditioner 4 immediately after the operation of the engine 10 starts, the engine ( 10) shorten the life, there is a problem that takes a long time to stabilize the operation of the engine (10).

In addition, there is a disadvantage in terms of reliability because the initial operating state of the cogeneration system as a whole is unstable. That is, as shown in FIG. 5, it takes a predetermined time (to) until the low pressure of the compressor 4 becomes stable ('A' portion of FIG. 5) after the operation of the heat pump type air conditioner 4 starts. If the operation of the engine 10 is unstable, the time for which the low pressure of the compressor 4 is stabilized becomes longer, and the initial operating performance of the heat pump type air conditioner 4 is lowered.

The present invention has been made to solve the above problems of the prior art, and after warming up the drive source, the power generated by the generator is supplied to a power consumer such as a heat pump type air conditioner, thereby improving the life of the drive source and the It is an object of the present invention to provide a cogeneration system and a control method thereof, in which a driving source can be stabilized at an initial operation and can be operated in a stable state.

In addition, an object of the present invention is to provide a cogeneration system and a method of controlling the same, in which the power consumption device such as the heat pump type air conditioner is operated in a stable operation of the engine, whereby the efficiency and reliability thereof can be improved. .

Cogeneration system according to the present invention for solving the above problems, the drive source; A waste heat recovery apparatus for recovering waste heat of the driving source; A generator which is driven by the drive source to produce generated power; At least one power consumer using the generated power; At least some of the power consumer may include a control unit configured to control the power supply to be allowed to be supplied after warm-up of the driving source.

One of the power consumers is a heat pump type air conditioner capable of cooling / heating, and the heat pump type air conditioner supplies waste heat absorbing the waste heat recovered to the waste heat recovery device so as to use waste heat of the driving source when heating. It is characterized in that connected to the heat exchanger.

One of the power consumer devices is a heat pump type air conditioner, and the control unit is characterized in that the power supply for generating power of the heat pump type air conditioner is controlled to be allowed after warm-up of the drive source.

The cogeneration system includes: an engine cooling apparatus for allowing the driving source to be operated within a proper temperature range by cooling water; A coolant temperature sensor for sensing a coolant temperature of the driving source; The controller may determine whether the driving source is warmed up through the cooling water temperature of the driving source.

The cogeneration system is characterized in that it comprises a generator switch for regulating the generated power output.

The cogeneration system includes an engine cooling apparatus for causing the driving source to be operated within a proper temperature range by cooling water; The waste heat recovery device is characterized in that it is provided to recover the heat of the cooling water cooling the drive source.

The control unit may control whether the driving source is stopped according to the indoor unit operation capacity of the heat pump type air conditioner, which is one of the power consumption devices.

In addition, the control method of the cogeneration system according to the present invention for achieving the above object is a power generation preparation step of driving the drive source when the driving request signal of the drive source for driving the generator is input; After starting the driving of the drive source, at least some of the power consumer device is characterized in that it comprises a power generation allowance step for receiving the generation power supply depending on whether the drive source is warmed up.

Heat pump type air conditioner of the power consumer is characterized in that the generation power is supplied through the power generation allowance step.

The generation power preparation step is characterized in that the driving source operation on process, the generator operation on process, and the generator switch on process in which the generator switch for intermittent generation power output is turned on.

In the generating power allowance step, it is determined whether the driving source is warmed up according to the cooling water temperature of the driving source.

The control method of the cogeneration system includes: a generation power use step of turning on an operation of a power consuming device that is allowed to supply generation power through the generation power supply allowing step; After the step of using the power generation power, the generation of the power supply through the power supply allow step further after the predetermined time after the operation off of the power consumption device allowed to supply the power generation, further comprising the step of stopping the power generation of the operation of the drive source .

The control method of the cogeneration system is characterized in that, after the step of preparing the generated power, some power consumers include a generated power using step to receive the generated power immediately regardless of the warm-up of the drive source.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic view of the cogeneration system according to the present invention during cooling, and FIG. 3 is a schematic view of the cogeneration system according to the present invention during heating.

The cogeneration system according to the present invention shown in FIGS. 2 and 3 is driven by a drive source 50, a waste heat recovery device 60 for recovering waste heat of the drive source 50, and a drive force of the drive source 50. And a generator 52 for generating generated power, and at least one power consumer using the generated power of the generator 52.

The driving source 50 may be implemented as a fuel cell or various devices such as an engine and a turbine which are operated by using fuel such as gas or petroleum. ).

The engine 50 includes a fuel pipe 53 through which fuel is supplied to a combustion chamber provided therein, and an exhaust pipe 54 through which exhaust gas exhausted from the combustion chamber is discharged.

In addition, the engine 50 is easily broken when the engine 50 is overheated, its life is shortened, and the engine output is decreased, and the reliability of the engine 50 is lowered when the engine efficiency is decreased when the engine 50 is overcooled. The engine cooler 55 is provided to allow the engine 50 to operate within an appropriate temperature range.

The engine cooler 55 guides the coolant to be circulated between the engine 50 and the coolant heat exchanger 61, which will be described later, among waste heat recovery devices 60 for dissipating heat absorbed from the engine 50. A cooling water circulation flow path 56 and a cooling water pump 57 installed on the cooling water circulation flow path 56 to pump the cooling water along the cooling water circulation flow path 56.

The cooling water circulation passage 56 may be provided with a cooling water temperature sensor 56 ′ for detecting the cooling water temperature.

The cooling water temperature sensor 56 ′ is for acquiring cooling water temperature information for determining whether the engine cooling device 55 is properly cooling the engine 50. The cooling water temperature sensor 56 ′ is provided on the cooling water circulation passage 56. Preferably, the engine 50 is positioned at the discharge port side of the engine 50 so as to sense the temperature of the coolant that has cooled the engine 50.

The waste heat recovery device 60 includes the cooling water heat exchanger 61 which takes away the heat of the cooling water of the engine cooling device 55 which has become a high temperature after cooling the engine 50, and the exhaust pipe 54 of the engine 50. The first and second exhaust gas heat exchangers 62 and 63 may be connected to each other to recover heat of exhaust gas exhausted from the engine 50.

The waste heat recovered by the waste heat recovery device 60 may be supplied to some of the power consumer devices through the waste heat supply heat exchanger 80 or may be radiated in the air through the heat dissipation device 85.

The waste heat supply heat exchanger (80) absorbs the heat recovered in at least one of the cooling water heat exchanger (61) and the first and second exhaust gas heat exchangers (62, 63), and the cooling water heat exchanger (61). And first and second exhaust gas heat exchangers 62 and 63 and a heat medium circulation passage 64 for guiding the heat medium for waste heat recovery. That is, the heat medium circulation passage 64 is a heat medium in the heat medium circulation passage 64 is the cooling water heat exchanger 61, the second exhaust gas heat exchanger 63, the first exhaust gas heat exchanger 62, and Waste heat supply heat exchanger 80 may be provided to circulate in turn. The heat medium circulation passage 64 is provided with a heat medium circulation pump 65 that performs a pumping function to circulate the heat medium in the heat medium circulation passage 64.

The heat dissipation device 85 includes a heat dissipation heat exchanger 86 in which heat recovered from the cooling water heat exchanger 61 and the first and second exhaust gas heat exchangers 62 and 63 is radiated to the atmosphere, and the heat medium circulation passage. The heat dissipation flow path 87 is connected to 64 to guide the heat medium in the heat medium circulation path 64 to the heat dissipation heat exchanger 68. In addition, the heat dissipation device 85 includes a heat dissipation fan 88 for forcibly blowing external air to the heat dissipation heat exchanger 86 to maximize heat dissipation.

At any one of two points at which the heat dissipation flow path 87 and the heat medium circulation path 64 are connected, a three-way side 94 for switching the flow of the heat medium is provided.

The generator 52 is implemented by any one of an alternator and a direct current generator.

The generator 52 is provided with a generator circuit breaker (GCB) 51 that can control the output of the generated power generated by the generator 52 to the outside. The generator switch 51 may be implemented as an on / off operation switch.

The electric power consumption device includes a heat pump type air conditioner for cooling / heating that consumes most of the generated electric power of the cooling water pump 57, the heat medium circulation pump 65, the heat radiating fan 88, and the generator 52. There is a flag.

The heat pump type air conditioner includes an outdoor unit Oa provided with a compressor 70, a four-way valve 73, an outdoor heat exchanger 75, an outdoor blower 75 ', and an outdoor expansion valve 77 used only for heating. The indoor heat exchanger (74), the indoor blower (74 '), the indoor expansion valve 76 is provided with an indoor unit (Ia) is installed.

The compressor 70 may be composed of one or more than two plural to each outdoor unit Oa. Hereinafter, only two compressors 70 are configured for each outdoor unit Oa.

The two compressors 70 installed in the respective outdoor units Oa are connected through a common accumulator 78 installed on a suction side on which a refrigerant, which is a heat medium of a heat pump type air conditioner, is sucked.

The heat pump type air conditioner may be composed of one outdoor unit Oa and one indoor unit Ia, may be composed of one outdoor unit Oa and a plurality of indoor units Ia, It is also possible to comprise the outdoor unit Oa and the plurality of indoor units Ia. Hereinafter, the heat pump type air conditioner according to the present embodiment will be described as being limited to a plurality of outdoor units Oa and a plurality of indoor units Ia.

The plurality of outdoor units Oa, indoor units Ia, and the waste heat supply heat exchanger 80 for supplying waste heat of the engine 50 to a heat pump type air conditioner during a heating operation may include a heat pump type air conditioner. It is connected through a refrigerant circulation passage 79 for guiding the refrigerant, which is a heat medium for cooling / heating, can be circulated.

The refrigerant circulation passage 79 is provided with a first opening / closing valve 81 at an inlet side of the waste heat supply heat exchanger 80 to block refrigerant from flowing into the waste heat supply heat exchanger 80 during a cooling operation. The first check valve 91 is provided at the outlet side of the waste heat supply heat exchanger 80 to block the refrigerant from flowing back to the waste heat supply heat exchanger 80 during the cooling operation.

In addition, the refrigerant circulation passage 79 includes a cooling passage 84 connecting the inlet side and the outlet side of the waste heat supply heat exchanger 80 to bypass the waste heat supply heat exchanger 80 during the cooling operation. It is provided.

The cooling passage 84 is provided with a second opening / closing valve 82 to guide the refrigerant during the cooling operation and block the inflow of the refrigerant during the heating operation.

In addition, the refrigerant circulation passage 79 is provided with a third open / close valve 83 at an inlet side of the outdoor heat exchanger 75 to block the refrigerant from flowing into the outdoor heat exchanger 75 during a heating operation. A second check valve 92 is provided at the outlet side of the outdoor heat exchanger 75 to block backflow of the refrigerant.

In addition, the refrigerant circulation passage 79 includes a bypass passage 90 connecting the inlet side and the outlet side of the outdoor heat exchanger 75 so that the refrigerant bypasses the outdoor heat exchanger 75 during a heating operation. do.

The bypass flow path 90 is provided with a third check valve 93 to block backflow of the refrigerant sucked into the outdoor heat exchanger 75 into the bypass flow path 90 during a cooling operation, and expand the refrigerant. The outdoor expansion valve 77 is positioned for the purpose of

As the refrigerant circulating through the refrigerant circulation passage 79 provided as described above, the refrigerant may be circulated only by one of the outdoor heat exchanger 75 and the waste heat supply heat exchanger 80 during the heating operation. 75 and the waste heat supply heat exchanger 80 are arranged in parallel.

On the other hand, the cogeneration system according to the present embodiment, including the power supply of the heat pump-type air conditioner of the power consumption device of the power consumption device according to whether the warm-up of the engine 50 at the start of operation of the engine 50, the overall The control unit 100 for controlling the operation of the cogeneration system is provided.

The controller 100 may determine whether the engine 50 is warmed up through the coolant temperature information obtained through the coolant temperature sensor 56 ′.

The operation of the cogeneration system according to the present invention configured as described above will be described with reference to FIGS. 2 to 4.

When the engine 50 and the plurality of indoor units Ia are stopped and any one of the plurality of indoor units Ia receives an operation command for cooling / heating, a driving request signal is input to the engine 50. (S2).

At this time, the valves 81, 82, 83, 77, 76, three-way side 94, and the like, generate power of the generator 52 according to the cooling or heating operation command of the indoor unit Ia. Not initialized by commercial power.

When the engine 50 receiving the driving request signal is operated, after the operation preparation signal is input to the generator 52, the generator 52 is driven by the engine 50 to generate generated power (S6). .

When the generator 52 is generated, after the GCB ON request signal is inputted to the generator switch 51, the generator switch 51 is turned on to allow the generator 52 to output the generated power (S8). .

When the generator switch 51 is turned on, other than the heat pump type air conditioner, that is, the cooling water pump 57 and the heat medium circulation pump 65, heat dissipation, among the power consumption devices supplied with the generated power of the generator 52. The fan 88 and the like are driven by receiving the generated power of the generator 52 immediately regardless of whether the engine 50 is warmed up (S20).

In addition, when the generator switch 51 is turned on, whether the engine 50 is warmed up is determined based on temperature information of the coolant cooling the engine 50 obtained through the coolant temperature sensor 56 '. (S10).

That is, the temperature T information of the coolant obtained by cooling the engine 50 acquired through the coolant temperature sensor 56 ′ is a preset warm-up reference value as a reference for determining whether the engine 50 is warmed up. To).

In the cooling water temperature comparison process, when the temperature T of the cooling water cooling the engine 50 obtained through the cooling water temperature sensor 56 'exceeds the preset warm-up reference value To, the engine 50 ) Is determined to be warmed up.

When the temperature of the coolant cooling the engine 50 is in the range of 75 to 85 ° C., the engine 50 is stably operated and its efficiency is good, and thus the preset warm-up reference value To is set to about 50 ° C. Is preferred.

If it is determined that the engine 50 is warmed up through the warm-up determination process of the engine 50 as described above, the generated power of the generator 52 is allowed to be supplied to the heat pump type air conditioner, and the heat pump The driving permission signal is input to the outdoor unit Oa of the air conditioner.

When the operation permit signal is input to the outdoor unit Oa of the heat pump type air conditioner, the heat pump type air conditioner receives the generated power of the generator 52 to perform a cooling / heating function (S12).

In addition, while the engine 50 is operating, the engine 50 is cooled by the engine cooling device 55, and the waste heat of the engine 50 is recovered by the waste heat recovery device 60. It is discharged through the waste heat supply heat exchanger 80 or the heat sink 85.

On the other hand, if none of the plurality of indoor units Ia receives a driving command while the cogeneration system is operating as described above, that is, when the operating capacity of the indoor unit Ia becomes zero (S14), the outdoor unit Oa Is stopped.

During operation of the cogeneration system, any one of the plurality of indoor units Ia may be operated before a predetermined time t (for example, about 5 minutes) has elapsed while the operating capacity of the indoor unit Ia is zero. On receipt, if the operating capacity of the indoor unit Ia is not zero, the outdoor unit Oa is driven again.

On the other hand, if a predetermined time t elapses with the operation capacity of the indoor unit Ia being zero during the operation of the cogeneration system (S16), the operation of the heat pump type air conditioner is stopped (S18). After the operation stop signal is input to the engine 50, the engine 50 is stopped (S19). That is, the cogeneration system is stopped.

Meanwhile, the cooling operation of the heat pump type air conditioner will be described in detail with reference to FIG. 2.

When the cooling operation command is input, the three-way side 94 is switched to the cooling mode. That is, the waste heat of the engine 50 recovered through the waste heat recovery device 60 is discharged to the atmosphere 100%.

The four-way valve 73 is switched to the cooling mode, the first opening / closing valve 81 is turned off, and the second and third opening / closing valves 82 and 83 are turned on. In addition, the outdoor expansion valve 77 is also turned off so that the bypass flow path 90 is blocked.

When the compressor 70, the outdoor blower 75 ′, and the indoor blower 74 ′ are driven while the cooling operation is prepared as described above, the refrigerant in the refrigerant circulation passage 79 exchanges heat with the compressor 70. Group 75, the indoor expansion valve 76, and the indoor heat exchanger 74 in turn.

Then, the refrigerant in the refrigerant circulation passage 79 is compressed in the compressor 70 and then condensed in the outdoor heat exchanger 75, and then expanded while passing through the indoor expansion valve 76. The refrigerant expanded at 76 is evaporated by heat exchange with the indoor air in which the indoor unit Ia in operation is installed in the indoor heat exchanger 74, whereby the room is cooled.

Next, the heating operation of the heat pump type air conditioner will be described in detail with reference to FIG. 3.

When the heating operation command is input, the three-way side 94 is switched to the heating mode. That is, at least a part of the waste heat of the engine 50 recovered through the waste heat recovery device 60 is discharged to the waste heat supply heat exchanger 80.

The four-way valve 73 is switched to a heating mode, the first open / close valve 81 is turned on, and the second and third open / close valves 82 and 83 are turned off.

When the compressor 70, the outdoor blower 75 ′, and the indoor blower 74 ′ are driven while the cooling operation is prepared as described above, the refrigerant in the refrigerant circulation passage 79 is compressed by the compressor 70. After the flow through the four-way valve (73) to the indoor heat exchanger (74).

The refrigerant flowing into the indoor heat exchanger (74) heats the indoor air while being condensed by the heat exchanged with the indoor air in which the indoor unit (Ia) is installed.

The refrigerant condensed in the indoor heat exchanger 74 is expanded by the indoor expansion valve 76 and then flows into the bypass flow path 90.

The refrigerant flowing into the bypass flow path 90 passes through the outdoor expansion valve 77, the third check valve 93, and the first open / close valve 91, and then flows into the waste heat supply heat exchanger 80. .

The refrigerant introduced into the waste heat supply heat exchanger 80 is evaporated by receiving the waste heat of the engine 50 recovered through the waste heat recovery device 60 from the waste heat supply heat exchanger 80.

The refrigerant evaporated in the waste heat supply heat exchanger (80) passes sequentially through the first check valve (91) and the four-way valve (73), and is circulated back to the compressor (70) through the common accumulator (78). .

In the heat pump type air conditioner that performs the heating function as described above, since the waste heat supply heat exchanger 80 serves as an evaporator instead of the outdoor heat exchanger 75 when heating, a constant heating is always performed regardless of the outdoor temperature change. Can provide the ability.

On the other hand, the heat pump type air conditioner does not use waste heat of the engine 50 according to the outdoor temperature at which the outdoor unit Ia is installed, and heats the outdoor heat exchanger as in the case of heating a general heat pump type air conditioner. It may be implemented that group 75 can be used as an evaporator.

In the cogeneration system and the control method thereof according to the present invention configured as described above, at least some of the power consumption devices that receive the generated power of the generator when the driving source such as the engine starts to operate may be configured to perform the warm-up of the generator after warming up the driving source. Since the driving is supplied with generated electric power, the load on the driving source can be minimized before warming up of the driving source, thereby improving the life of the driving source, and the driving source can be warmed up quickly and stably operated. .

In addition, at least the heat pump type air conditioner of the power consumer is operated by receiving the generated power of the generator after warming up the old man, and thus the operating state can be stabilized quickly, thereby improving the initial operating performance. .

Claims (17)

A drive source; A generator which is driven by the drive source to produce generated power; A waste heat recovery apparatus for recovering waste heat of the driving source; A waste heat supply heat exchanger for absorbing the recovered waste heat of the waste heat recovery apparatus; A heat pump type air conditioner that uses the generated electric power and is connected to the waste heat supply heat exchanger such that a refrigerant can be heat exchanged with the waste heat recovered by the waste heat recovery device; And a controller configured to control the heat pump type air conditioner to be allowed to supply the generated electric power after warm-up of the driving source. The control unit is a cogeneration system for controlling whether the driving source is stopped according to the indoor unit operating capacity of the heat pump type air conditioner. The method of claim 1, A cogeneration system comprising a generator switchgear to intercept the generated power output. The method according to claim 1 or 2, An engine cooling device for allowing the driving source to be operated within a proper temperature range by the cooling water; Cooling water temperature sensor for detecting the cooling water temperature of the drive source, And the control unit is configured to determine whether the driving source is warmed up through the cooling water temperature of the driving source. delete delete delete delete delete The method according to claim 1 or 2, The cogeneration system includes an engine cooling apparatus for causing the driving source to be operated within a proper temperature range by cooling water; The waste heat recovery apparatus is a cogeneration system for recovering the heat of the cooling water cooling the drive source. delete delete delete delete delete delete delete delete

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