JP4468852B2 - Power generation / air conditioning system - Google Patents

Description

  The present invention includes a plurality of engine-driven heat pump devices with a power generation function in which a generator and a compressor are linked to an engine, a refrigerant circuit that includes an expansion valve and an indoor heat exchanger, and is connected to the compressor. The present invention relates to a power generation / air conditioning system that includes a power load connected to a commercial power source and is configured to be able to supply power generated by a generator to the power load.

  In general, a large-scale consumer such as an office building, a supermarket, or a store building determines a basic charge for one year based on power used within a certain time such as 30 minutes, so-called demand.

Under such circumstances, conventionally, various measures have been taken to reduce demand.
For example, when the amount of power used within a certain period of time is detected and the amount of power used exceeds a predetermined level of used power, or the accumulated amount of power used after a certain period of time is predicted to exceed a predetermined level Outputs a demand alarm signal, selectively unloads or stops the motor compressor, starts the engine compressor, and when the demand alarm signal continues to be generated, selectively unloads another motor compressor sequentially Or stop and start another engine compressor, effectively cut the power consumption without lowering the work efficiency due to lack of compressed air, lower the contract power value, and cheap work The overall operation cost can be reduced (see Patent Document 1).

In addition, when the secondary battery is charged during a time period when the power demand is small and the discharge power from the secondary battery is supplied to the electrical equipment during a time period when the power demand is large, a direct current from the bidirectional converter device is obtained by the inverter device. There is also one in which power is converted into AC power and supplied to the outside so that the power load can be leveled (see Patent Document 2).
Japanese Patent No. 2679058 Japanese Patent No. 3417365

However, in the case of the conventional example, only the electric power used for air conditioning is reduced, and there is still room for improvement.
In addition, when a secondary battery is provided, there is a drawback in that the installation cost and the control configuration of the secondary battery require a large amount of cost and the economic efficiency is lowered.

The present invention was made in view of such circumstances, the invention according to claim 1, intended to be able to suppress an increase in the economically receiving denden competence claim the invention according to 2, while it is possible to reduce the running cost, it is an object of the so that it is possible to suppress satisfactorily the increase of the generated power amount more increases and the received power amount, the invention according to claim 3, An object is to enable an increase in the amount of received power to be suppressed while responding well to the needs of the user.

In order to achieve the above-described object, the invention according to claim 1
A plurality of engine-driven heat pump devices with a power generation function in which a generator and a compressor are linked to the engine;
A refrigerant circuit comprising an expansion valve and an indoor heat exchanger and connected to the compressor;
A power load connected to a commercial power source and capable of supplying power generated by the generator;
Received power measuring means for measuring power received from the commercial power source;
Received power amount calculating means for calculating the received power amount by integrating the power measured by the received power measuring means for a predetermined time;
A received power amount predicting means for calculating and predicting a next received power amount based on a temporal change in the received power amount calculated by the received power amount calculating means;
A power amount comparing means for outputting a demand signal when it is determined that the predicted received power amount exceeds the set power amount by comparing the received power amount calculated and predicted by the received power amount predicting unit; and
In response to a demand signal from the power amount comparison means, a power generation control means for driving a generator by outputting a start signal to an engine-driven heat pump device with a predetermined power generation function;
In the power generation and air conditioning system with
Driving efficiency calculation means for calculating the operating efficiency provided in each engine-driven heat pump device with each power generation function;
An operating state determining means for determining what is in an operating state among the engine-driven heat pump devices with the power generation function;
When there are a plurality of engine-driven heat pump devices with a power generation function that are determined by the operating state determining means, the operating efficiency selecting means that preferentially selects the one with the low operating efficiency calculated by the operating efficiency calculating means And
In response to the demand signal from the power amount comparison means, the power generation control means is in the operation state determined by the operation state determination means, and the operation efficiency selected by the operation efficiency selection means is low. The engine driving heat pump device with a power generation function is configured to output a start signal preferentially to drive the generator .

(Action / Effect)
According to the configuration of the power generation / air conditioning system according to claim 1, when it is predicted that the amount of received power received from the commercial power source will increase and exceed the set power amount, the power generation function has low operation efficiency in the operating state. The engine-driven heat pump device is preferentially activated to drive the generator, thereby suppressing an increase in the amount of received power.
Therefore, while increasing the engine efficiency, the generated generator obtains the generated power and suppresses the increase in the amount of received power, so it can generate power efficiently in terms of fuel consumption without installing another facility. it can be powered, economically it is possible to suppress an increase in receiving Denden competence.

In order to achieve the above object, the invention according to claim 2
The power generation / air conditioning system according to claim 1,
A total operation time measuring means provided in each engine-driven heat pump device with a power generation function for measuring the total operation time;
When there are a plurality of engine-driven heat pump devices with a power generation function determined by the operating state determining means , the total operation that preferentially selects the one with the short total operating time measured by the total operating time measuring means Time priority selection means,
The power generation control means is configured to output a start signal to the engine-driven heat pump device with a power generation function selected by the total operation time selection means in response to a demand signal to drive the generator.

(Action / Effect)
According to the configuration of the power generation / air conditioning system according to claim 2, when there are a plurality of engine-driven heat pump devices with a power generation function in a stopped state, the engine-driven heat pump device with a power generation function with a short total operation time is given priority. Start up and drive the generator to suppress the increase in received power.
Therefore, the total operation time of a plurality of engine-driven heat pump devices with a power generation function can be leveled, and when performing maintenance based on the operation time, maintenance for a plurality of engine-driven heat pump devices with a power generation function can be performed at one time. can, while it is possible to reduce the running cost, Ru can be satisfactorily suppress the increase of the generated power amount more increases and received power amount.

In order to achieve the above object, the invention according to claim 3
The power generation / air conditioning system according to claim 1 or 2 ,
Comprising an operation mode selection means capable of selectively setting the operation mode of the engine-driven heat pump device with a power generation function to a power generation priority operation mode and an air conditioning priority operation mode;
The power generation control means is configured to give the highest priority to the engine-driven heat pump device with a power generation function for which the power generation priority operation mode is selected by the operation mode selection means .

(Action / Effect)
According to the configuration of the power generation / air conditioning system according to the third aspect, the generator of the engine-driven heat pump device with a power generation function in the power generation priority operation mode is preferentially driven to suppress an increase in the amount of received power.
Therefore, for example , for an engine-driven heat pump device with a power generation function in an air conditioning priority operation mode that requires highly important air conditioning demand such as a computer room or a guest room, while being able to respond well even in sudden operation, For example, a generator is driven by an engine-driven heat pump device with a power generation function in a power generation priority operation mode where the importance of air conditioning is low, such as in a conference room, etc. The increase can be suppressed.

As apparent from the above description, according to the power generation and air conditioning system according to claim 1, when the received power amount received from the commercial power supply is expected to exceed the set amount of power increase, in the operating condition The engine-driven heat pump device with a power generation function with low operating efficiency is preferentially activated to drive the generator, thereby suppressing an increase in the amount of received power.
Therefore, while increasing the engine efficiency, the generated generator obtains the generated power and suppresses the increase in the amount of received power, so it can generate power efficiently in terms of fuel consumption without installing another facility. it can be powered, economically it is possible to suppress an increase in receiving Denden competence.

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 FIG. 2A, the engine-driven heat pump device 2 with a power generation function interlocks a generator 6 with one of the output shafts 4 of the engine 3 via a power generation clutch 5 and outputs an output. The other end of the shaft 4 is configured by interlockingly connecting a compressor 10 via a belt type transmission mechanism 7, a compressor transmission mechanism 8 and an air conditioning clutch 9.

The engine housing 11 is provided with a cooling fan 12, and is configured to convert the DC power from the generator 6 into AC power through a converter 15 and an inverter 16 and supply the fan motor 13 and the cooling water pump 14. ing.
Moreover, it is comprised so that the electric power generated from the generator 6 converted into alternating current power can be supplied to electric power loads, such as the illumination in the building 1, via the inverter 16 and the receiving / transforming equipment 17. FIG. The power receiving / transforming equipment 17 is configured to supply commercial power via a power line 18.

  A refrigerant circuit 19 is connected to the compressor 10 (details of an outdoor heat exchanger, a four-way switching valve, and the like are omitted), and an indoor heat exchanger installed in the building 1 is connected to the refrigerant circuit 19. 20 and an expansion valve 21 are provided, and the compressor 10 is driven by the engine 3 using city gas as fuel, and cooling and heating can be performed corresponding to each floor.

As shown in the block diagram of the control system of one embodiment of FIG. 3, the receiving / transforming equipment 17 is provided with received power measuring means 22 that measures the power received from the commercial power source.
The engine 3 is provided with an engine control unit 25 that controls the start switch 23 and the engine speed control device 24 in addition to the power generation clutch 5, the compressor transmission mechanism 8, and the air conditioning clutch 9 described above.

  The engine control unit 25 includes a total operation time measurement unit 26 that measures the total operation time of the engine 3, an air conditioning load measurement unit 27 that measures the air conditioning load, and an operation mode of the engine-driven heat pump device 2 with a power generation function. Is provided with an operation mode selection means 28 that can alternatively set the power generation priority operation mode and the air conditioning priority operation mode.

  A microcomputer 29 is connected to the received power measuring means 22, and a timer 30 that is reset every 30 minutes and an engine control unit 25 are connected to the microcomputer 29.

  The microcomputer 29 includes a received power amount calculation unit 31, a received power amount prediction unit 32, a power amount comparison unit 33, an operation stop state determination unit 34, a total operation time selection unit 35, an air conditioning load selection unit 36 and a power generation control unit 37. Is provided.

The received power amount calculating means 31 calculates the received power amount by integrating the power measured by the received power measuring means for a predetermined time (30 minutes) set by the timer 30.
The received power amount prediction means 32 calculates and predicts the next received power amount based on the temporal change of the received power amount calculated by the received power amount calculation means 31. That is, the rate of change is obtained by calculating the difference between the previous received power amount and the current received power amount, and the next received power amount is calculated and predicted by multiplying the current received power amount by the change rate. It has become.

  In the power amount comparison means 33, the received power amount calculated and predicted by the received power amount prediction means 32 and the set power amount (the power amount used as the contract reference or a slightly smaller power amount may be set). A demand signal is output when it is determined that the predicted received power amount exceeds the set power amount by comparison.

  The operation stop state discriminating means 34 operates based on a signal input from the engine control unit 25 based on whether the start switch 23 is in the ON state or the OFF state. A stop state and an operation state are discriminated from each other.

  In the total operation time priority selection means 35, the total operation time measured by the total operation time measurement means 26 when there are a plurality of engine-driven heat pump devices 2 with the power generation function determined by the operation stop state determination means 34. Priority is given to the item with less time.

  In the air conditioning load selection means 36, when there is no engine-driven heat pump apparatus 2 with a power generation function in the operation stop state determined by the operation stop state determination means 34, the engine-driven heat pump apparatus 2 with a power generation function in the operation state is selected. The air-conditioning load measuring means 27 measures a small air-conditioning load and selects it with priority.

With the above configuration, in response to a demand signal from the power amount comparison means 33, the power generation control means 37 controls the driving of the engine-driven heat pump device 2 with a power generation function, which will be described next.
In response to the demand signal in response to the demand signal being output when the power amount comparison means 33 determines that the predicted received power amount exceeds the set power amount, the operation stop state determination means 34 has a power generation function in the operation stop state. The engine-driven heat pump device 2 is discriminated.

  Here, when there are a plurality of engine-driven heat pump devices 2 with the power generation function in the operation stop state, the operation mode selection means 28 gives priority to the one set in the power generation priority operation mode, and the total operation time selection means 35 The engine-driven heat pump device 2 with the power generation function with the shorter total operation time is selected, a start signal is output, and the generator 6 is driven.

  When the power generation is sequentially performed according to the above-described procedure and the engine-driven heat pump device 2 with the power generation function in the operation stopped state is lost, the engine-driven heat pump device 2 with the power generation function in the operation state is selected.

  Here, when there are a plurality of engine-driven heat pump devices 2 with a power generation function in an operating state, priority is given to the operation mode selection means 28 set in the power generation priority operation mode, and the air conditioning load selection means 36 controls the air conditioning load. The engine-driven heat pump device 2 with a smaller power generation function is selected to output a power generation amount increase signal, and the engine speed is increased without reducing the air conditioning capacity.

  When the engine speed is increased, the rotational speed of the variable capacity type compressor 10 is decreased by the compressor speed change mechanism 8 so as to be inversely proportional to the increase of the engine speed, and the rotational speed of the generator 6 is increased. Thus, while increasing the amount of generated power, the rotation speed of the compressor 10 is maintained constant to maintain the discharge capacity constant, and the air conditioning capacity is not substantially reduced.

  FIG. 2B is a front view of an engine-driven heat pump device with a power generation function equipped with a fixed capacity type compressor. Two compressors 10 are provided, and the output shafts of both the compressors 10 and the engine 1 are shown. 4 are linked together through one belt-type transmission mechanism 7 and individual air-conditioning clutch 9.

  When this fixed capacity type compressor 10 is used, as the engine speed increases, one of the air-conditioning clutches 9 is disconnected and the number of compressors 10 operated is reduced to 2 as the engine speed increases twice. By changing from one to one, the change in the discharge capacity is suppressed, and the air conditioning capacity is not substantially reduced.

FIG. 4 is a block diagram showing a control system of an embodiment of the power generation / air conditioning system according to the present invention. The difference from the embodiment is as follows.
That is, the operation control unit 25 is provided with an operation efficiency calculation unit 51 instead of the air conditioning load measurement unit 27, and the microcomputer 29 is provided with an operation state determination unit 52 instead of the operation stop state determination unit 34, and Instead of the air conditioning load selection means 36, operating efficiency selection means 53 are provided.

  The operation efficiency calculation means 51 calculates the operation efficiency of the engine 3 based on the engine speed, the discharge pressure, the suction pressure, the outside air temperature, and the like, and the calculated operation efficiency is calculated, for example, every 1 to 3 minutes. The data is transmitted to the selection means 53.

  In the operation state discriminating means 52, based on the signal input from the engine control unit 25, the operation state of the engine-driven heat pump device 2 with the power generation function is determined based on whether the start switch 23 is in the ON state or the OFF state. And those in a stopped state are discriminated.

  In the operation efficiency selection means 53, when there are a plurality of engine-driven heat pump devices 2 with a power generation function that are determined by the operation state determination means 52, priority is given to the one with the lower operation efficiency calculated by the operation efficiency calculation means 51. To select.

With the above configuration, in response to a demand signal from the power amount comparison means 33, the power generation control means 37 controls the driving of the engine-driven heat pump device 2 with a power generation function, which will be described next.
In response to the demand signal in response to the demand signal being output by the power amount comparison means 33 determining that the predicted received power amount exceeds the set power amount, the driving state determination means 52 performs engine driving with a power generation function. The type heat pump device 2 is discriminated.

  Here, when there are a plurality of engine-driven heat pump devices 2 with a power generation function in the operating state, the operation mode selection means 28 gives priority to the one set in the power generation priority operation mode, and the operation efficiency selection means 53 determines the operation efficiency. The engine-driven heat pump device 2 with the smaller power generation function is selected to output a power generation amount increase signal, and the engine speed is increased without reducing the air conditioning capability.

  Power generation is sequentially performed according to the above-described procedure, and when the engine-driven heat pump device 2 with the power generation function in the operating state disappears, the engine-driven heat pump device 2 with the power generation function in the operation stopped state is selected.

  Here, when there are a plurality of engine-driven heat pump devices 2 with a power generation function in the operation stop state, priority is given to the operation mode selection means 28 set in the power generation priority operation mode, and the total operation time selection means 35 The engine-driven heat pump device 2 with the power generation function with the shorter total operation time is selected, a start signal is output, and the generator 6 is driven.

The present invention includes not only the configuration of the embodiment but also the following configuration.
(1) A system that does not include the operation mode selection means 28.
(2) A system that does not include the total operation time measurement means 26 and the total operation time selection means 35.

  As the engine 1 of the above-described embodiment, various engines such as a general-purpose gas engine, a diesel engine, and a gasoline engine can be used.

It is a schematic block diagram which shows the Example of the electric power generation and air conditioning system which concerns on this invention. (A) is a front view of an engine-driven heat pump device with a power generation function including a variable capacity type compressor, and (b) is a front view of an engine-driven heat pump device with a power generation function including a fixed capacity type compressor. FIG. It is a block diagram which shows the control system of the example of 1 aspect . It is a block diagram which shows the control system of the Example of the electric power generation and air conditioning system which concerns on this invention.

2 ... Engine-driven heat pump with power generation function
3 ... Engine
6 ... generator 10 ... compressor 19 ... refrigerant circuit 20 ... indoor heat exchanger 21 ... expansion valves 22 ... received power amount measuring means 26 ... total operating time measurement hands stage
2 8 ... operation mode selection means 31 ... received power amount calculating means 32 ... receiving power amount prediction means 33 ... power quantity comparing unit 34 ... operation stop state determining means 35 ... total operating time selection hand stage
3 7 ... power generation control means 51 ... the operating efficiency calculation means 52 ... operating state discrimination means 53 ... the operating efficiency selecting means

Claims (3)

A plurality of engine-driven heat pump devices with a power generation function in which a generator and a compressor are linked to the engine;
A refrigerant circuit comprising an expansion valve and an indoor heat exchanger and connected to the compressor;
A power load connected to a commercial power source and capable of supplying power generated by the generator;
Received power measuring means for measuring power received from the commercial power source;
Received power amount calculating means for calculating the received power amount by integrating the power measured by the received power measuring means for a predetermined time;
A received power amount predicting means for calculating and predicting a next received power amount based on a temporal change in the received power amount calculated by the received power amount calculating means;
A power amount comparing means for outputting a demand signal when it is determined that the predicted received power amount exceeds the set power amount by comparing the received power amount calculated and predicted by the received power amount predicting unit; and
In response to a demand signal from the power amount comparison means, a power generation control means for driving a generator by outputting a start signal to an engine-driven heat pump device with a predetermined power generation function;
In the power generation and air conditioning system with
Driving efficiency calculation means for calculating the operating efficiency provided in each engine-driven heat pump device with each power generation function;
An operating state determining means for determining what is in an operating state among the engine-driven heat pump devices with the power generation function;
When there are a plurality of engine-driven heat pump devices with a power generation function that are determined by the operating state determining means, the operating efficiency selecting means that preferentially selects the one with the low operating efficiency calculated by the operating efficiency calculating means And
In response to the demand signal from the power amount comparison means, the power generation control means is in the operation state determined by the operation state determination means, and the operation efficiency selected by the operation efficiency selection means is low. A power generation / air conditioning system configured to output a start signal preferentially to an engine-driven heat pump device with a power generation function to drive a generator. The power generation / air conditioning system according to claim 1,
A total operation time measuring means provided in each engine-driven heat pump device with a power generation function for measuring the total operation time;
When there are a plurality of engine-driven heat pump devices with a power generation function determined by the operating state determining means , the total operation that preferentially selects the one with the short total operating time measured by the total operating time measuring means Time priority selection means,
A power generation / air conditioning system in which a power generation control means outputs a start signal to the engine-driven heat pump device with a power generation function selected by the total operation time selection means in response to a demand signal to drive a generator. The power generation / air conditioning system according to claim 1 or 2 ,
Comprising an operation mode selection means capable of selectively setting the operation mode of the engine-driven heat pump device with a power generation function to a power generation priority operation mode and an air conditioning priority operation mode;
A power generation / air conditioning system in which the power generation control means gives the highest priority to the engine-driven heat pump device with a power generation function in which the power generation priority operation mode is selected by the operation mode selection means .

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