JP5342162B2 - Power generation / air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase flexibility in system design by rational improvement, to improve use efficiency of electric power, and further to effectively reduce demand. <P>SOLUTION: This power generation-air conditioning system includes an engine-driven heat pump device 2 with a power generating function constituted by interlocking and connecting an AC generator 6 and a compressor to an engine, and a refrigerant from the compressor is supplied to an outdoor-side heat exchanger and an indoor-side heat exchanger. AC power generated by the AC generator 6 is converted into DC power by a convertor 17 for generated output, and the DC power is supplied to a DC electric motor 15 of an outdoor fan 13. A convertor 26 for commercial power is connected to a DC power line 24 from the convertor 17 for generated output, a commercial power source 25 is connected to a convertor 26 for commercial power, the AC power from the commercial power source 25 is converted into DC power and joined to generated output, and the joined DC power is supplied to a DC electric motor 20 of an indoor fan 18. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention comprises an engine-driven heat pump device with a power generation function in which a generator and a compressor are linked to an engine, an outdoor heat exchanger that supplies refrigerant from the compressor, and an indoor heat exchanger. The present invention relates to a power generation / air conditioning system configured to be able to supply power generated from a machine and power from a commercial power source to an outdoor fan of an outdoor heat exchanger, an indoor fan of an indoor heat exchanger, and other power loads.

In this type of system, the power generated by the generator of the engine-driven heat pump device with power generation function is used to drive the engine cooling water pump and the outdoor fan of the outdoor heat exchanger, and the excess power is exchanged indoors. It is supplied to the indoor fan and other electric power loads.
However, when using surplus generated power, there is a problem of grid interconnection in which power flows back to the power company when it is linked to commercial power, and there is a disadvantage that a complicated and expensive protection device is required. .

Therefore, in order to eliminate the inconvenience as described above, conventionally, the following gas heat pump type air conditioner is known.
A gas heat pump type air conditioner is configured by an outdoor unit, an indoor unit, and a refrigerant circulation passage that circulates between the outdoor unit and the indoor unit.
The outdoor unit has a compressor, an engine that drives the compressor, and an outdoor heat exchanger, and a synchronous motor that is a generator is connected to the engine so that power is generated when the engine has sufficient power. It is configured.

A PWM converter is connected to the synchronous motor, and the AC power generated by the synchronous motor is converted to DC power. On the other hand, AC power from an AC commercial power source is configured to be converted to DC power via a converter. Auxiliary equipment is connected to the PWM converter and converter via a load inverter to convert DC power to AC power, and the synchronous motor and commercial power supply cooperate to supply power to the auxiliary equipment ( Patent Document 1).
JP 2005-265220 A

However, in the case of the conventional example, after the generated power generated by the synchronous motor is converted from AC power to DC power, and further converted to AC power, the auxiliary machine on the indoor heat exchanger side cooperates with the commercial power source. It can be supplied.
For this reason, there is a disadvantage that the degree of freedom in system design is reduced due to restrictions on the selection of auxiliaries due to restrictions on the choice of auxiliaries, such as the number of phases and the number of wires used as auxiliary machines. In addition, since an AC electric motor has to be used to drive the indoor fan in the indoor heat exchanger, there is a disadvantage in that the power use efficiency decreases.

  In general, for large-scale customers such as office buildings, supermarkets, and store buildings, the basic charge for one year is determined based on the power used within a certain period of time such as 30 minutes, so-called demand, and this demand is reduced. Using generated power. However, in the case of the conventional example, in order to convert the generated power converted to DC power into AC power and supply it to the auxiliary machine, power loss is caused by the conversion, and the amount of generated power used to reduce demand is reduced. There was also a disadvantage that the air conditioning load had to be reduced.

The present invention was made in view of such circumstances, the rational improvement, it is possible to increase the degree of freedom in system design, to improve power use efficiency, further, effectively reducing the demand An object of the present invention is to make it possible to easily cope with many indoor fans when a plurality of engine-driven heat pump devices with a power generation function are used.

In order to achieve the above object, the present invention provides
An engine-driven heat pump device with a power generation function in which a generator and a compressor are linked to the engine;
An outdoor heat exchanger provided with an outdoor fan and connected to the compressor to supply refrigerant from the compressor;
Including an indoor fan and an indoor heat exchanger connected to the compressor and supplying refrigerant from the compressor,
In the power generation / air conditioning system configured to be able to supply the generated power of the generator and the power from the commercial power source to the indoor fan and other power loads,
A plurality of engine-driven heat pump devices with the power generation function are installed,
The generator is constituted by an AC generator and the outdoor fan and the motor for driving the indoor fan are constituted by a DC electric motor that is driven by DC power,
Each of the engine-driven heat pump devices with a power generation function is provided with a converter for generated power that converts AC power generated by the AC generator into DC power,
DC power lines connected to the respective generated power converter are connected to each other merge into confluence DC power lines, the power generated from the alternator is converted to DC power that make up can be supplied to the indoor fan.

According to the configuration of the power generation / air conditioning system according to the present invention , both the outdoor fan and the indoor fan are configured by a DC electric motor, the power generated by the AC generator is converted to DC power, and the DC power is directly converted to DC. The outdoor fan and the indoor fan can be driven by supplying the electric motor .
In addition, the power generated by the AC generators of the engine-driven heat pump devices with a plurality of power generation functions is joined to the DC power line for merging and supplied to the indoor fan.
Therefore, since the outdoor fan and the indoor fan are driven by DC power, the outdoor fan and the indoor fan are not restricted by the power supply system used in the commercial power supply such as the number of phases and the number of lines, so the selection is not restricted. The degree of freedom in system design can be improved.
In addition, since the generated power converted to DC power is supplied to the outdoor fan and indoor fan as they are, power loss due to conversion can be reduced compared to the case where the power is converted to AC power as in the past, and the power usage efficiency is reduced. Since the power loss can be reduced and power loss can be reduced, the amount of generated power used to reduce demand can be increased. As a whole, the system is improved by a rational improvement of driving outdoor fans and indoor fans with DC power. The degree of freedom in design can be increased, the power use efficiency can be improved, and the demand can be effectively reduced.
Moreover, even if there are many indoor fans, it is only necessary to connect and connect to the DC power line for merging after merging, compared to the case of connecting to the DC power line of the engine-driven heat pump device with an individual power generation function. Thus, it is not necessary to consider which one to connect to. When a plurality of engine-driven heat pump devices with a power generation function are used, a large number of indoor fans can be handled easily.

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

Figure 1 is a schematic block diagram showing an embodiment of a power generation and air conditioning system according to the present invention, the roof to five power generation function engine driving type heat pump device 2 of the building 1 is provided.
As shown in the front view of the drive system of the compressor shown in FIG. 2, the engine-driven heat pump device 2 with a power generation function generates AC power via one of the output shafts 4 of the engine 3 using city gas as fuel via a power generation clutch 5. The machine 6 is linked and connected to the other side of the output shaft 4 via the belt-type transmission mechanism 7 and the first and second air-conditioning clutches 8 and 9. The compressor 11 is interlocked and connected. In FIG. 1, the second compressor 11 is omitted.

  The engine housing 12 in which the engine 3 is installed is provided with an outdoor heat exchanger 14 including two outdoor fans 13 for cooling, and further, a DC electric motor 15 that drives the outdoor fan 13 and cooling water for cooling the engine. A pump 16 and a converter 17 for generated power that converts AC power generated by the AC generator 6 into DC power are provided.

An indoor side heat exchanger 19 including an indoor fan 18 is provided at various locations in the building 1, and the indoor fan 18 is configured to be driven by a DC electric motor 20.
A refrigerant circuit 21 is connected to the first and second compressors 10 and 11, and a four-way valve 22, an outdoor heat exchanger 14, an expansion valve 23, and an indoor heat exchanger that switch the refrigerant flow path to the refrigerant circuit 21. 19 is interposed, and is configured so that cooling or heating can be performed by switching the refrigerant flow path.

As shown in the schematic configuration diagram showing the electrical system in FIG. 3, the DC power line 24 connected to the converter 17 for generated power is connected to the DC load such as the cooling water pump 16 or the AC power from the commercial power supply 25 as DC power. The commercial power converter 26 to be converted and the DC electric motor 15 of the outdoor fan 13 are connected, and the commercial power source 25 is connected to the commercial power converter 26.
Further, the DC electric motor 20 of the indoor fan 18 is connected to the DC power line 24, and the DC power converted by the generated power converter 17 is supplied to the DC electric motor 20 of the indoor fan 18.

  An indoor fan converter 27 that converts AC power into DC power is connected to the DC electric motor 20 of the indoor fan 18, and a distribution board 29 is connected to the indoor fan converter 27 via a branch AC power line 28a. . A commercial power supply 25 is connected to the distribution board 29, and another power load 30 such as lighting equipment is connected to another branch AC power line 28 a connected to the distribution board 29. In the figure, 31 indicates a circuit breaker.

  With the above configuration, during normal times, the AC generator 6 is driven to generate power while the generated power from the AC generator 6 and the power from the commercial power supply 25 can be supplied in cooperation to perform air conditioning. The generated power thus generated can be converted into direct current power, and the direct current power can be directly supplied to the direct current electric motors 15 and 20 to drive the outdoor fan 13 and the indoor fan 18. On the other hand, AC power from the commercial power source 25 is also converted into DC power by the commercial power converter 26 and converted to DC power by the indoor fan converter 27 and supplied to the indoor fan 18 by the indoor fan converter 27. Can do. Further, AC power from the commercial power supply 25 can be supplied via the distribution board 29 to another power load 30 driven by AC power.

As shown in FIG. 4 , the DC power lines 24 of the five (plural units) engine-driven heat pump devices 2 with a power generation function are connected to each other and merged into the merging DC power line 32, and the generated power from the AC generator 6. Is converted to DC power by the generated power converter 17, and then the DC power is combined and supplied to the indoor fan 18 and other power loads 30 .

As the engine 3 of the above-described embodiment, various engines such as a general-purpose gas engine, a diesel engine, and a gasoline engine can be used.
In the above embodiment, the first and second compressors 10 and 11 having different capacities are linked to the engine 3 in an interlocking manner, but they may be of the same capacity. Further, the number of compressors to be linked and connected may be one or three or more. Further, one compressor may be linked to the engine 3 through a transmission mechanism.

It is a schematic block diagram which shows the Example of the electric power generation and air conditioning system which concerns on this invention. It is a front view which shows the drive system of a compressor. It is a schematic block diagram which shows an electric system. It is a schematic diagram showing the electrical system.

Explanation of symbols

2 ... Engine-driven heat pump with power generation function
3 ... Engine
DESCRIPTION OF SYMBOLS 6 ... AC generator 10 ... 1st compressor 11 ... 2nd compressor 13 ... Outdoor fan 14 ... Outdoor heat exchanger 15 ... DC electric motor (for outdoor fan 13)
17 ... Converter for generated power 18 ... Indoor fan 19 ... Indoor heat exchanger 20 ... DC electric motor (for indoor fan 18)
24 ... DC power line 25 ... Commercial power supply 26 ... Converter for commercial power 27 ... Converter for indoor fan 29 ... Distribution board 30 ... Other power load 32 ... DC power line for confluence

Claims (1)

An engine-driven heat pump device with a power generation function in which a generator and a compressor are linked to the engine;
An outdoor heat exchanger provided with an outdoor fan and connected to the compressor to supply refrigerant from the compressor;
Including an indoor fan and an indoor heat exchanger connected to the compressor and supplying refrigerant from the compressor,
In the power generation / air conditioning system configured to be able to supply the generated power of the generator and the power from the commercial power source to the indoor fan and other power loads,
A plurality of engine-driven heat pump devices with the power generation function are installed,
The generator is constituted by an AC generator and the outdoor fan and the motor for driving the indoor fan are constituted by a DC electric motor that is driven by DC power,
Each of the engine-driven heat pump devices with a power generation function is provided with a converter for generated power that converts AC power generated by the AC generator into DC power,
DC power lines connected to each converter for generated power are connected to each other and merged with a DC power line for merging, and the generated power from the AC generator converted into DC power can be supplied to the indoor fan. A power generation and air conditioning system.

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