JP2011007357A - Air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve air conditioning high in energy consumption efficiency according to air conditioning load.SOLUTION: An air conditioning device has a compressor 12 constituting a refrigerating cycle, a generator 30, a capacitor 31 charged by the generator, a gas engine 10 driving the compressor and the generator, a control means C for controlling a rotational frequency of the gas engine according to an air conditioning load, and a temperature detecting means 37 for detecting a temperature of a conditioned room in which the air conditioning is performed by the refrigerating cycle, or a suction air temperature of a user-side heat exchanger 15 constituting the refrigerating cycle. In the case that the detection temperature of the temperature detecting means rises to a prescribed on-point temperature with the compressor stopped, the compressor is started in a motor driving mode, and the mode is moved to a gas engine driving mode when the detection temperature rises to a prescribed threshold value temperature higher than the on-point temperature after the starting.

Description

  The present invention relates to a gas heat pump type air conditioner including a compressor constituting a refrigeration cycle, a generator, a capacitor charged by the generator, and a gas engine driving the compressor and the generator.

  Conventionally, as an air conditioner system, an electric heat pump with an inverter (so-called EHP) for electrically driving a compressor and a gas heat pump (so-called GHP) for driving a compressor with an engine using natural gas as a fuel have been widely used. ing. In the EHP type air conditioner, it is possible to freely change the rotation speed of the compressor according to the air conditioning load. However, when the air conditioning load is large in summer or winter, the power consumption increases. The peak demand for power demand is an issue.

  On the other hand, since the GHP air conditioner can obtain a larger output than the EHP air conditioner, efficient air conditioning can be realized for a large air conditioning load in summer or winter. In the case of GHP, the engine speed is controlled according to the air conditioning load. However, in order to improve the durability of the engine and the inconvenience that the engine stops, the air conditioning load is reduced during the intermediate period between summer and winter. Even if the number is small, it must be driven at a predetermined low rotational speed. For this reason, there is a problem that the engine is driven wastefully with respect to the air conditioning load and energy is consumed, resulting in inefficient partial load operation.

  Therefore, as shown in Patent Document 1, a hybrid system including a gas engine, a compressor driven by the gas engine, a generator, and an electric compressor driven by the output of the generator has been developed. Yes. In this case, when the air conditioning load is large, a compressor driven by a gas engine is used, and when the air conditioning load is small, an electric compressor driven by the output from the generator is used. Further, in a system including a plurality of air conditioners, some air conditioners are driven by a gas engine according to the air conditioning load, and other air conditioners are electrically driven by energy generated by the gas engine. Driving the compressor.

JP 2007-187330 A

  However, in the heat pump system as described above, each air conditioner needs to include both a compressor driven by the engine and an electric compressor driven by energy generated by the generator. There is a rise in production costs. Further, in this case, since the gas engine is driven to drive the electric compressor and power is generated by the generator, in any case, the gas engine must be driven at a low rotational speed, and the efficiency is increased. There was a problem of being bad.

  The present invention has been made in order to solve the conventional technical problem, and by driving the compressor by a gas engine or using the energy charged in the battery according to the air-conditioning load, high energy can be obtained. Realize consumption-efficient air conditioning.

  In order to solve the above problems, a gas heat pump type air conditioner according to the present invention drives a compressor, a generator, a capacitor charged by the generator, and the compressor and the generator that constitute a refrigeration cycle. A gas engine, a control means for controlling the rotation speed of the gas engine according to an air conditioning load, a temperature of a conditioned room air-conditioned by the refrigeration cycle, or a use side heat exchanger constituting the refrigeration cycle Temperature detecting means for detecting the intake air temperature, and the control means drives the compressor and the generator by the gas engine, and controls the gas engine from the compressor and the generator. A motor drive mode for driving the compressor, wherein the generator is a motor using the energy charged in the capacitor, and the compressor is stopped. When the detected temperature of the temperature detecting means rises to a predetermined ON point temperature in the running state, the compressor is started in the electric motor drive mode, and the detected temperature is higher than the ON point temperature after starting. When the temperature rises to a predetermined threshold temperature, the gas engine drive mode is entered.

  The invention of claim 2 includes a compressor constituting a refrigeration cycle, a generator, a capacitor charged by the generator, a gas engine driving the compressor and the generator, and the gas depending on the air conditioning load. Control means for controlling the rotational speed of the engine, and temperature detection means for detecting the temperature of the conditioned room that is air-conditioned by the refrigeration cycle or the intake air temperature of the use side heat exchanger that constitutes the refrigeration cycle The control means uses a gas engine drive mode in which the compressor and the generator are driven by the gas engine, and uses the energy charged in the capacitor to disconnect the gas engine from the compressor and the generator. The generator is an electric motor, and has an electric motor drive mode for driving the compressor. In a state where the compressor is stopped, the detected temperature of the temperature detecting means is When the temperature rises to a predetermined ON point temperature, the compressor is started in the electric motor drive mode, and when the detected temperature rise degree after the start is equal to or higher than a predetermined value, the gas engine drive mode is entered. It is characterized by that.

  According to a third aspect of the present invention, there is provided a compressor that constitutes a refrigeration cycle, a generator, a battery that is charged by the generator, a gas engine that drives the compressor and the generator, and the gas according to an air conditioning load. Control means for controlling the rotational speed of the engine, and temperature detection means for detecting the temperature of the conditioned room that is air-conditioned by the refrigeration cycle or the intake air temperature of the use side heat exchanger that constitutes the refrigeration cycle The control means uses a gas engine drive mode in which the compressor and the generator are driven by the gas engine, and uses the energy charged in the capacitor to disconnect the gas engine from the compressor and the generator. The generator is an electric motor, and has an electric motor drive mode for driving the compressor, and the detected temperature of the temperature detecting means is determined from the state where the compressor is stopped. When the temperature rises to the ON point temperature, the compressor is started in the electric motor drive mode if the degree of increase in the detected temperature so far is less than a predetermined value, and if it is equal to or higher than the predetermined value, the gas The compressor is started in an engine drive mode.

  According to the invention of claim 1, the control means starts the compressor in the electric motor drive mode when the temperature detected by the temperature detection means rises to a predetermined ON point temperature in a state where the compressor is stopped. At the same time, when the detected temperature rises to a predetermined threshold temperature higher than the ON point temperature after start-up, it shifts to the gas engine drive mode, so in a situation where the air conditioning load is small, the compressor is driven by power supply from the capacitor, Wasteful energy consumption can be reduced. And if it is judged from the fact that the air conditioning load has increased to a predetermined threshold temperature, it is more energy efficient than driving the compressor by power supply from the capacitor, and the comparison is made after the start of operation. A compressor driven by a gas engine that can be air-conditioned to a target temperature in a short time can be realized.

  As a result, the drive mode can be changed according to fluctuations in the air conditioning load, so the air conditioning load increases, and in a state where the driving by the gas engine can be efficiently performed, the motor driving mode is switched to the gas engine driving mode, Efficient air conditioning can be realized.

  According to the invention of claim 2, the control means starts the compressor in the motor drive mode when the detected temperature of the temperature detection means rises to a predetermined ON point temperature in a state where the compressor is stopped. At the same time, when the degree of increase in the detected temperature after startup is equal to or greater than a predetermined value, the gas engine drive mode is entered, so the condition of the cooling load in the conditioned room is determined from the degree of temperature increase during execution of the motor drive mode, When the degree of temperature rise is large, the motor drive mode can be shifted to the gas engine drive mode at an early stage.

  Therefore, it is possible to cope with load fluctuations quickly, and the compressor can be driven by an efficient gas engine before the temperature in the conditioned room becomes an uncomfortable region, and air conditioning can be realized with high energy consumption efficiency as a whole. Is possible.

  According to the invention of claim 3, when the detected temperature of the temperature detecting means rises to a predetermined ON point temperature from a state where the compressor is stopped, the control means increases the degree of detection temperature until that time to a predetermined value. If it is less than the value, the compressor is started in the electric motor drive mode, and if it is equal to or greater than the predetermined value, the gas engine is started in the gas engine drive mode. When the fluctuation state of the cooling load in the conditioned room is appropriately judged from the degree of temperature rise in the conditioned room, and the degree of temperature rise is equal to or higher than the predetermined value and the cooling load is judged to be large, the gas engine drive mode is set. The compressor can be restarted, and it becomes possible to cope with load fluctuations as soon as possible. Before the temperature in the conditioned room becomes an uncomfortable region, it is possible to realize efficient driving of the compressor by the gas engine corresponding to a high air conditioning load.

  On the other hand, if it is determined that the temperature rise in the conditioned room when the compressor is stopped is less than a predetermined value and the cooling load is small, the battery is charged by the generator that is driven as the motor in the motor drive mode. The energy can be used to restart the compressor. This makes it possible to achieve air conditioning with high energy consumption efficiency as a whole.

It is a schematic block diagram of a gas heat pump type air conditioning apparatus. It is a schematic block diagram which shows the relationship between the compressor in a gas engine drive mode, a gas engine, and a generator. It is a schematic block diagram which shows the relationship between the compressor in a motor drive mode, a gas engine, and a generator. It is a timing chart at the time of air-conditioning control. It is a timing chart at the time of the air-conditioning control of another Example. (When the gas engine is stopped) It is a timing chart at the time of the air-conditioning control of another Example. (When the compressor restarts) It is a timing chart at the time of the air-conditioning control of another Example. (When the compressor restarts)

  Hereinafter, an embodiment of a gas heat pump type air conditioner 1 of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a gas heat pump type air conditioner 1. The gas heat pump type air conditioner 1 is composed of an outdoor unit 2 installed outdoors and, for example, a wall-mounted indoor unit 3 disposed indoors and provided with an indoor heat exchanger (use side heat exchanger). Both are connected by a refrigerant pipe (liquid pipe 4A and gas pipe 4B) through a service valve (not shown). In the figure, the outdoor unit 2 is indicated by a two-dot chain line, and the indoor unit 3 is indicated by a one-dot chain line.

  The outdoor unit 2 includes a compressor 12 constituting a refrigeration cycle, a generator 30, a capacitor 31 charged by the generator 30, a gas engine 10 that drives the compressor 12 and the generator 30, and a control device C. And.

  The refrigeration cycle includes a compressor 12, an accumulator 13, a four-way valve 23, an outdoor heat exchanger (heat source side heat exchanger) 17, an expansion valve 24 as decompression means, It is comprised by the indoor side heat exchanger (use side heat exchanger) 15 arrange | positioned at the unit 3. FIG. An accumulator 13 is connected to the suction side of the compressor 12, and a four-way valve 23 is connected to the discharge side. The outdoor heat exchanger 17 and the expansion valve 24 are sequentially connected to the side to which the four-way valve 23 is connected, and the indoor heat exchanger 15 is connected via a liquid pipe 4A provided with a service valve. A gas pipe 4B provided with a service valve is connected to the refrigerant outlet side of the indoor heat exchanger 15, and the gas pipe 4B is connected to the four-way valve 23. This constitutes an annular refrigeration cycle. The compressor 12, the expansion valve 24, the four-way valve 23, and the like are controlled by the control device C.

  In the vicinity of the outdoor heat exchanger 17 disposed in the outdoor unit 2, an outdoor blower 18 that blows air to the outdoor heat exchanger 17 is disposed. Further, an indoor fan 16 for blowing air to the indoor heat exchanger 15 is disposed in the vicinity of the indoor heat exchanger 15 disposed in the indoor unit 3. In principle, the blowers 16 and 18 are supplied with electric power from the generator 30 converted into direct current by a power converter 34 described later. However, when the generator 30 is not generating power, power is supplied from a commercial power source. The blowers 16 and 19 are controlled by the control device C.

  Therefore, the gas heat pump type air conditioner 1 is set to the cooling operation or the heating operation when the four-way valve 23 is switched by the control device C. That is, when the four-way valve 23 is switched to the cooling operation side, the refrigerant circulating in the refrigeration cycle is discharged from the compressor 12 as indicated by the broken line arrow, and then flows into the outdoor heat exchanger 17 acting as a condenser. After the heat is dissipated, the pressure is reduced by the expansion valve 24 and flows into the indoor heat exchanger 15 acting as an evaporator, evaporates and exhibits a cooling action, and then returns to the compressor 12. Thereby, the room to be conditioned is cooled by the indoor heat exchanger 15. On the other hand, when the four-way valve 23 is switched to the heating operation side, the refrigerant sealed in the refrigerant circuit is discharged from the compressor 12 as indicated by a solid line arrow, and then enters the indoor heat exchanger 15 acting as a condenser. After flowing in and dissipating heat, the pressure is reduced by the expansion valve 24, flows into the outdoor heat exchanger 17 acting as an evaporator, evaporates, and then returns to the compressor 12. Thereby, the room is heated by the indoor heat exchanger 15.

  The compressor 12 is connected to a gas engine 10 having an electromagnetic clutch (transmission means) 14 so as to be able to contact and separate, and can be driven by the gas engine 10.

  On the other hand, the gas engine 10 provided in the outdoor unit 2 is operated by the fuel gas supplied from the fuel supply system. That is, a fuel supply pipe 25 is connected to the gas engine 10, and a fuel cutoff valve 26, a zero governor 27, and a fuel adjustment valve 28 that are controlled to open and close by the control device C are sequentially connected to the fuel supply pipe 25.

  The fuel shut-off valve 26 is selectively closed or fully opened to selectively control the shutoff and flow of the fuel gas. The zero governor 27 adjusts the fuel supply to the gas engine 10 at a constant pressure on the fuel adjustment valve 28 side even if the fuel cutoff valve 26 side causes a pressure fluctuation in the fuel supply pipe 25 due to the open / close control. The fuel adjustment valve 28 optimally adjusts the air-fuel ratio of the mixed gas generated by mixing the fuel gas and air.

  The gas engine 10 is provided in the outdoor unit 2 and burns the gas supplied from the fuel supply system to generate a driving force, and the compressor 12 is driven by the driving force. Waste heat generated by the combustion of gas is cooled by circulating engine cooling water. That is, the cooling water path 5 of the gas engine 10 includes a cooling water pump 21 that circulates the engine cooling water and a radiator 19 that radiates the engine cooling water. The radiator 19 is provided with a radiator blower 20. The radiator blower 20 blows air to the radiator 19, thereby accelerating the heat radiation of the cooling water. The cooling water pump 21 and the radiator blower 20 are controlled by the control device C.

  Thereby, when the cooling water pump 21 is always operated while the gas engine 10 is being driven, the engine cooling water circulates through the cooling water path through the gas engine 10, the cooling water pump 21, and the radiator 19 in order. Thus, the gas engine 10 is cooled.

  Here, with reference to FIG.2 and FIG.3, the relationship between the compressor 12, the gas engine 10, and the generator 30 is demonstrated. FIG. 2 is a schematic configuration diagram showing the relationship between the compressor 12, the gas engine 10 and the generator 30 in the gas engine drive mode, and FIG. 3 shows the relationship between the compressor 12, the gas engine 10 and the generator 30 in the motor drive mode. The schematic block diagram shown is shown.

  A belt 32 is stretched between the input shaft 12 </ b> A of the compressor 12 and the output shaft 10 </ b> A of the gas engine 10. An electromagnetic clutch 14 is provided on the output shaft 10 </ b> A of the gas engine 10, and can be connected to the belt 32 via the clutch 14. In addition to the belt 32, the input shaft 12 </ b> A of the compressor 12 spans a belt 33 between the input shaft 12 </ b> A and the drive shaft 30 </ b> A of the generator 30.

  Thus, when the gas engine 10 is driven, the power of the gas engine 10 is transmitted to the input shaft 12A of the compressor 12 via the belt 32, and further, the drive shaft 30A of the generator 30 via the belt 33. Is transmitted to.

  Here, the generator 30 is driven by the gas engine 10 to convert a part of its shaft output into electric energy, and outputs three-phase AC power to the power converter 34. This power converter 34 incorporates a power generation control controller for variably controlling the power generation output amount of the power generator 30, and converts the three-phase AC power from the power generator 30 into DC power via an AC / DC converter. Then, the electric power is charged in the battery 31. At this time, the electric power generated by the generator 30 and converted into direct current along with the charging of the battery 31 is converted into the inside of the equipment of the gas heat pump type air conditioner 1 as described above, that is, the outdoor blower 18 and the like. Output to the radiator blower 20 and further to auxiliary equipment such as the indoor blower 16.

  When the control device C switches to the gas engine drive mode and the clutch 14 connects the output shaft 10A of the gas engine 10 to the input shaft 12A of the compressor 12 and the drive shaft 30A of the generator 30 via the belts 32 and 33. (FIG. 2), the power of the gas engine 10 is transmitted to the compressor 12 and the generator 30, the compressor 12 driven by the gas engine 10 compresses the refrigerant, and the air conditioning operation such as the heating operation or the cooling operation is performed. At the same time, the battery 31 is charged by the generator 30.

  In addition, when the motor drive mode is set by the control device C and the clutch 14 of the gas engine 10 is disconnected from the compressor 12 and the generator 30 (FIG. 3), the generator 30 in the present embodiment The electric motor is supplied, and the power from the drive shaft 30A of the generator 30 is transmitted to the input shaft 12A of the compressor 12 via the belt 33. In this case, the compressor 12 is not driven by the gas engine 10, but is driven by the generator 30 using the electric power charged in the battery 31 as the electric motor.

  The control device C in the present embodiment is constituted by a general-purpose microcomputer provided with a timer 36 as a time measuring means, and as described above, the compressor 12, the gas engine 10, and the clutch of the gas engine 10 14, the generator 30, the power converter 34, the four-way valve 23, the blowers 16, 18, 20, the expansion valve 24, the cooling water pump 21, and the valve devices 26, 27, 28 are controlled. Further, at least the control device C is input with a temperature sensor (temperature detection means) 37 for detecting the temperature of the conditioned room or the intake air temperature of the indoor heat exchanger 15.

  Hereinafter, the operation at the time of air-conditioning control will be described with reference to FIG. FIG. 4 shows a change in the rotational speed of the gas engine 10, a generator driving or driving state of the generator 30 as a motor, and a change in the temperature sensor 37. When the operation start instruction is input from the remote controller connected to the indoor unit 3 via the communication line, the control device C detects the intake air temperature of the indoor heat exchanger 15 in this embodiment. Based on the input from 37, the air conditioning load is acquired in real time. In addition, the control device C acquires the amount of electricity stored in the battery 31 and, when the amount of electricity stored is equal to or less than a predetermined value, the gas engine drive mode is set as the air-conditioning priority operation capacity corresponding to the air-conditioning load. Thus, the rotational speed of the gas engine 10 is specified, and the rotational speed of the gas engine 10 is controlled so as to be the rotational speed.

  Since the battery 31 is not charged at the beginning of operation, the gas engine drive mode is executed. In this gas engine drive mode, the control device C connects the clutch 14 to the belt 32 and connects the output shaft 10A of the gas engine 10 to the input shaft 12A of the compressor 12 and the drive shaft of the generator 30 via the belts 32 and 33. Connect to 30A. Thus, the generator 30 is driven as a generator, and the power transmitted from the output shaft 10A of the gas engine 10 to the drive shaft 30A of the generator 30 via the belts 32 and 33 is converted into electric energy, and three-phase AC power is obtained. Is output to the power converter 34. The power converter 34 converts the three-phase AC power from the generator 30 into DC power via an AC / DC converter, and then charges the capacitor 31 with the power.

  As shown in FIG. 4, by executing the gas engine drive mode, the compressor 12 is driven by the gas engine 10, and the indoor heat exchanger 15 that acts as an evaporator exhibits a cooling action and is conditioned. Will be cooled. In this embodiment, the operation of the compressor 12 is controlled based on the ON point temperature and the OFF point temperature of the compressor 12 set above and below the set temperature. That is, when the temperature detected by the temperature sensor 37 reaches the OFF point temperature, the control device C stops the operation of the compressor 12, and the temperature of the conditioned room gradually increases due to the influence of the outside air temperature and the like. When the point temperature is reached, the compressor 12 is restarted. During the heating operation, the indoor heat exchanger 15 acts as a radiator, and the conditioned room is heated by radiating heat. Therefore, when the temperature detected by the temperature sensor 37 reaches the OFF point temperature of the compressor 12, the control device C stops the operation of the compressor 12, and the temperature of the conditioned room gradually decreases due to the influence of the outside air temperature or the like. When the ON point temperature is reached, the compressor 12 is restarted.

  Here, in the control device C in the present embodiment, a predetermined low rotational speed of the gas engine 10 is set, and the rotational speed of the gas engine 10 whose rotational speed is controlled according to the air conditioning load as described above is the temperature. Even before the temperature detected by the sensor 37 reaches the OFF point temperature, when the air conditioning load decreases and reaches a predetermined low speed, the gas engine 10 is stopped and executed so far. The gas engine drive mode is shifted to the electric motor drive mode.

  In this electric motor drive mode, the control device C disconnects the clutch 14 from the belt 32 and disconnects the gas engine 10 from the compressor 12 and the generator 30. Then, the electric energy charged in the battery 31 in the gas engine drive mode that has been executed previously is discharged, and the power converter 34 converts the DC power into the AC power to drive the generator 30 as a motor.

  Thereby, the motive power output from the drive shaft 30A of the generator 30 driven as an electric motor is transmitted to the input shaft 12A of the compressor 12 via the belt 33. In this case, the compressor 12 can be driven by using the generator 30 as an electric motor using the electric energy charged in the battery 31 instead of the gas engine 10.

  When the chamber 12 is further cooled by driving the compressor 12 in the electric motor drive mode and the temperature detected by the temperature sensor 37 reaches the OFF point temperature, the control device C stops the operation of the compressor 12. End the motor drive mode.

  Then, when the temperature of the conditioned room gradually increases due to the influence of the outside air temperature or the like, and the temperature detected by the temperature sensor 37 reaches the ON point temperature, the control device C executes the motor drive mode again and compresses it. The machine 12 is restarted.

  When the air-conditioning load is small, the compressor 12 is driven using the electric energy charged in the battery 31, and between the predetermined ON point temperature and the OFF point temperature based on the temperature detected by the temperature sensor 37. By controlling the operation, the conditioned room can be maintained at a predetermined cooling temperature. As a result, even in a situation where the air conditioning load is small and the operating efficiency of the gas engine is poor, the air conditioning control can be efficiently realized using the electric energy charged in the battery 31 in the gas engine drive mode.

  In this case, when the amount of electricity stored in the battery 31 is equal to or less than a predetermined value, the motor drive mode is terminated, the gas engine drive mode is entered, and the compressor 12 and the generator 30 are driven by the gas engine 10. This is executed, and the continuous operation of the compressor 12 and the charging of the battery 31 by the generator 30 are performed.

  On the other hand, when the air conditioning load is large, that is, as described above, the temperature increases even though the motor drive mode is being executed, and the temperature detected by the temperature sensor 37 as shown in FIG. When the temperature rises to a predetermined threshold value that is higher than the temperature by a predetermined temperature, the control device C ends the electric motor drive mode and shifts to the gas engine drive mode as described above. In the heating operation, the threshold value is set to a temperature lower than the ON point temperature by a predetermined temperature.

  As a result, the gas engine driving mode in which the compressor 12 is driven by the gas engine 10 having higher energy efficiency as the load increases can be executed, and even when the air conditioning load is large in summer or winter, the efficiency is increased. Air-conditioning operation can be realized. Then, it is determined that the energy efficiency of the gas engine 10 has decreased due to the rotation speed of the gas engine 10 being equal to or less than the predetermined rotation speed, the gas engine 10 is stopped, and the battery 31 is charged in the gas engine drive mode. The electric motor drive mode in which the compressor 12 is driven using the generated electrical energy by using the generator 30 as an electric motor can be executed.

  In this way, the compressor 12 is driven by the gas engine 10 in the gas engine drive mode, and the excess electricity is charged in the battery 31, so that the air conditioning load is small and the gas engine 10 cannot be driven with high energy efficiency. In this case, the compressor 12 can be driven using the electric energy charged in the battery 31 in the gas engine drive mode, and air conditioning with high energy consumption efficiency can be realized.

  In particular, in this embodiment, since the rotational speed of the gas engine 10 has decreased to a predetermined low rotational speed or less, the gas engine driving mode is shifted to the electric motor driving mode, so that the driving mode can be switched efficiently, Air conditioning can be realized with high energy consumption efficiency as a whole.

  Further, in this embodiment, when the temperature detected by the temperature sensor 37 reaches a predetermined OFF point temperature or the like, the detected temperature of the temperature sensor 37 is a predetermined ON point temperature when the compressor 12 is stopped. When the compressor 12 is started in the electric motor drive mode and the detected temperature rises to a predetermined threshold temperature higher than the ON point temperature after the start, the gas engine drive mode is entered. Judging from the fact that it has increased to a predetermined threshold temperature, the energy efficiency is higher than when the compressor 12 is driven by electricity, and the target temperature is reached in a relatively short time after the start of operation. The compressor drive by the gas engine 10 which can be air-conditioned can be realized.

  As a result, the air conditioning load increases in accordance with fluctuations in the air conditioning load, and in the state where the driving by the gas engine 10 can be efficiently performed, the motor driving mode is switched to the gas engine driving mode to realize efficient air conditioning. can do.

  In the above embodiment, when the rotation speed of the gas engine 10 falls below a predetermined rotation speed when the gas engine drive mode is being executed, the gas engine drive mode is shifted to the electric motor drive mode. However, the present invention is not limited to this, and as shown in FIG. 5, the rotational speed of the gas engine 10 decreases to a predetermined rotational speed or less, and the temperature detected by the temperature sensor 37 decreases to a predetermined temperature or lower. In this case, the gas engine drive mode may be shifted to the electric motor drive mode.

  Thus, in consideration of the cooling state in the conditioned room, the motor drive mode is set on condition that the rotation speed of the gas engine 10 is equal to or lower than a predetermined low speed and is cooled to a predetermined temperature or lower. In a situation where the engine is not sufficiently cooled, the gas engine drive mode can be continuously executed. Therefore, the motor drive mode is executed in a state where the chamber is not sufficiently cooled, and it is possible to effectively eliminate the inconvenience that the temperature in the conditioned room immediately rises to an uncomfortable region without being able to respond quickly to load fluctuations. Is possible. In FIG. 5, the predetermined temperature is set between the ON point temperature and the OFF point temperature. However, the predetermined temperature is not limited to this, and a temperature at which the conditioned room is not sufficiently cooled, for example, It may be a predetermined temperature higher than the ON point temperature.

  Therefore, the drive mode can be switched more efficiently, and air conditioning can be realized with high energy consumption efficiency as a whole.

  In this embodiment, since the cooling operation is taken as an example, as a condition for shifting from the gas engine drive mode to the motor drive mode, the rotational speed of the gas engine 10 is equal to or lower than a predetermined low rotational speed, and Although it is supposed that it is cooled to a predetermined temperature or lower, the condition for shifting from the gas engine driving mode to the electric motor driving mode in the case of heating operation is that the rotational speed of the gas engine 10 is equal to or lower than a predetermined low rotational speed, And it shall be heated to more than predetermined temperature as the state fully heated. As a result, the gas engine drive mode is switched to the electric motor drive mode without being sufficiently heated, and the temperature in the conditioned room immediately rises to an uncomfortable region without being able to respond quickly to load fluctuations. Can be eliminated.

  Further, in the above embodiment, when the temperature detected by the temperature sensor 37 reaches the ON point temperature from the state where the compressor 12 is stopped and restarted, first, the motor drive mode is executed, and nevertheless, the temperature sensor When the detected temperature 37 is equal to or higher than a predetermined threshold value higher than the ON point temperature, the motor drive mode is shifted to the gas engine drive mode. However, the present invention is not limited to this. The drive mode may be shifted according to the conditions as shown.

  In the embodiment in FIG. 6, when the temperature detected by the temperature sensor 37 reaches the ON point temperature from the state where the compressor 12 is stopped and restarted, first, the motor drive mode is executed, and when the motor drive mode is executed. The degree of temperature increase detected by the temperature sensor 37 is detected. Specifically, the temperature rise Δt per predetermined time is measured, and when the temperature rise Δt becomes equal to or greater than a predetermined value, the motor drive mode is shifted to the gas engine drive mode.

  As a result, the condition of the cooling load in the conditioned room is determined from the degree of temperature rise during execution of the motor drive mode, and when the degree of temperature rise is steep (large), the predetermined threshold as described above is reached. Before doing so, it is possible to shift from the electric motor drive mode to the gas engine drive mode. Therefore, it is possible to cope with load fluctuations quickly, and the compressor 12 can be driven by the efficient gas engine 10 before the temperature in the conditioned room becomes an uncomfortable region, and air conditioning is realized with high energy consumption efficiency as a whole. It becomes possible to do.

  In addition to this, as shown in FIG. 7, the control device C detects the degree of increase Δt in the temperature detected by the temperature sensor 37 when the compressor 12 is stopped, and the degree of increase (temperature increase rate) is predetermined. When the temperature sensor 37 is higher than the value, the gas engine drive mode is executed when the temperature sensor 37 rises to the ON point temperature (the left figure in FIG. 7), and the increase degree (temperature increase rate) is equal to or less than a predetermined value. May execute the electric motor drive mode (the right diagram in FIG. 7). Specifically, the degree of temperature increase (temperature increase rate) is stored in the storage unit of the control device C by detecting a plurality of detected temperatures of the temperature sensor 37 in a predetermined time period when the compressor 12 is stopped. When the slope of the temperature change during the predetermined time to the ON point temperature is not less than a predetermined value, that is, when it is steep, the gas engine drive mode is executed when the temperature rises to the ON point temperature, and when it is less than the predetermined value, That is, when it is slow, the motor drive mode is executed when the temperature rises to the ON point temperature. In addition, the detection of the degree of temperature rise is not limited to this. In addition to this, the stop time of the compressor 12, that is, the time from when the OFF point temperature is reached to when the ON point temperature is reached is a predetermined time. If shorter, the gas engine drive mode may be executed, and if longer, the electric motor drive mode may be executed.

  As a result, the temperature rise degree in the state where the compressor 12 is stopped, in this embodiment, the temperature rise degree (temperature rise rate) in the process until the temperature detected by the temperature sensor 37 rises to the ON point temperature. When the condition of the air-conditioning load is appropriately determined, and when it is determined that the degree of temperature increase (temperature increase rate) is equal to or greater than a predetermined value and the cooling load is large, the gas engine 10 is executed from the beginning by executing the gas engine drive mode. Thus, the compressor 12 can be driven. For this reason, it is possible to quickly cope with load fluctuations, and it is possible to realize efficient driving of the compressor by the gas engine corresponding to a high air conditioning load before the temperature in the conditioned room becomes an uncomfortable region.

  On the other hand, if the degree of temperature increase (temperature increase rate) is less than the predetermined value and it is determined that the cooling load is small, compression is performed using the energy charged in the capacitor by the generator driven as the motor in the motor drive mode. You can restart the machine. This makes it possible to achieve air conditioning with high energy consumption efficiency as a whole.

  In this embodiment, since the cooling operation is taken as an example, as a selection condition of the drive mode when the compressor 12 is restarted from the state where the compressor 12 is stopped, the harmonized condition in the stopped state of the compressor 12 is used. When the temperature rise degree is large using the indoor temperature rise degree (temperature rise rate) as an index, when it is determined that the cooling load is large and the compressor 12 is restarted in the gas engine drive mode, and the temperature rise degree is small In this case, it is determined that the cooling load is small and the compressor 12 is restarted in the electric motor drive mode. However, in the case of heating operation, the compressor 12 is restarted from the stopped state. As a selection condition for the drive mode, when the temperature decrease degree is large with the temperature decrease degree (temperature decrease rate) in the conditioned room when the compressor 12 is stopped as an index, the heating load is large. It is determined that the restart of the compressor 12 by the gas engine drive mode, when lowering the degree of temperature is small, to restart the compressor 12 determines that the heating load is small by the electric motor drive mode.

  As a result, when the heating load is large, the gas engine drive mode is executed from the beginning and the compressor 12 can be driven by the gas engine 10, and the temperature in the conditioned room can not be dealt with promptly. It is possible to effectively eliminate the inconvenience that immediately falls to the uncomfortable area.

DESCRIPTION OF SYMBOLS 1 Gas heat pump type air conditioner 2 Outdoor unit 3 Indoor unit 4A Liquid pipe 4B Gas pipe 5 Cooling water path 10 Gas engine 12 Compressor 13 Accumulator 14 Clutch (transmission means)
15 Indoor heat exchanger (use side heat exchanger)
16 Indoor blower 17 Outdoor heat exchanger (heat source side heat exchanger)
18 Outdoor blower 19 Radiator 20 Radiator blower 23 Four-way valve 24 Expansion valve 25 Fuel supply pipe 30 Generator 31 Accumulator 32, 33 Belt 34 Power converter 36 Timer (time measuring means)
37 Temperature sensor (temperature detection means)

Claims (3)

A compressor constituting a refrigeration cycle, a generator, a capacitor charged by the generator, a gas engine for driving the compressor and the generator, and a rotational speed of the gas engine according to an air conditioning load Control means, and temperature detecting means for detecting the temperature of the conditioned room that is air-conditioned by the refrigeration cycle, or the intake air temperature of the use side heat exchanger that constitutes the refrigeration cycle,
The control means includes a gas engine driving mode in which the compressor and the generator are driven by the gas engine;
The gas engine is disconnected from the compressor and the generator, the generator is used as an electric motor using energy charged in the capacitor, and an electric motor driving mode for driving the compressor,
When the detected temperature of the temperature detecting means rises to a predetermined ON point temperature in a state where the compressor is stopped, the compressor is started in the electric motor drive mode, and the detected temperature is A gas heat pump type air conditioner that shifts to the gas engine drive mode when the temperature rises to a predetermined threshold temperature higher than the ON point temperature. A compressor constituting a refrigeration cycle, a generator, a capacitor charged by the generator, a gas engine for driving the compressor and the generator, and a rotational speed of the gas engine according to an air conditioning load Control means, and temperature detecting means for detecting the temperature of the conditioned room that is air-conditioned by the refrigeration cycle, or the intake air temperature of the use side heat exchanger that constitutes the refrigeration cycle,
The control means includes a gas engine driving mode in which the compressor and the generator are driven by the gas engine;
The gas engine is disconnected from the compressor and the generator, the generator is used as an electric motor using energy charged in the capacitor, and an electric motor driving mode for driving the compressor,
When the detected temperature of the temperature detecting means rises to a predetermined ON point temperature in a state where the compressor is stopped, the compressor is started in the electric motor drive mode, and the detected temperature after the start is detected. A gas heat pump type air conditioner that shifts to the gas engine drive mode when the degree of increase is a predetermined value or more. A compressor constituting a refrigeration cycle, a generator, a capacitor charged by the generator, a gas engine for driving the compressor and the generator, and a rotational speed of the gas engine according to an air conditioning load Control means, and temperature detecting means for detecting the temperature of the conditioned room that is air-conditioned by the refrigeration cycle, or the intake air temperature of the use side heat exchanger that constitutes the refrigeration cycle,
The control means includes a gas engine driving mode in which the compressor and the generator are driven by the gas engine;
The gas engine is disconnected from the compressor and the generator, the generator is used as an electric motor using energy charged in the capacitor, and an electric motor driving mode for driving the compressor,
When the detected temperature of the temperature detecting means rises to a predetermined ON point temperature from the state where the compressor is stopped, the motor drive mode is entered if the detected temperature rise until then is less than a predetermined value. The gas heat pump type air conditioner is characterized in that the compressor is started and the compressor is started in the gas engine drive mode when the compressor is above a predetermined value.

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