JP2006296039A - Power generating/air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the increase of received electric energy while improving the durability of the entire system by leveling the loads of the engines of a plurality of engine-driven heat pump devices provided with power generating functions without affecting air conditioning as much as possible. <P>SOLUTION: An engine-driven heat pump device provided with a power generating function is installed on the rooftop of a building, and a compressor is driven to perform air conditioning, and also the power generated by a generator is supplied to a power load within the building. The electric energy received from a commercial power source increases, and an electric energy comparing means 31 judges that the estimated electric energy received, which is computed in a means 30 for estimating an received electric energy, gets over set electric energy, and a demand signal is output. Then, an operation load selecting means 33 selects an engine-driven heat pump device provided with a generating function which is equipped with an engine where the maximum load in an operation load within a set period stored in an operation load storage means 32 is smaller, in answer to the demand signal, and drives the generator. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 including a power load connected to a commercial power source and 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 to start the engine compressor, and when the demand alarm signal continues to be generated after that, another motor compressor is selectively unloaded 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 has been made in view of such circumstances, and the invention according to claim 1 is directed to an engine load of a plurality of engine-driven heat pump devices with a power generation function without affecting the air conditioning operation as much as possible. The invention according to claim 2 is capable of leveling the engine load more satisfactorily so that the increase in the amount of received power can be suppressed while improving the durability of the entire system. An object of the present invention is to make it possible to suppress an increase in the amount of received power without affecting the air conditioning operation.

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
Operating load measuring means provided in each engine-driven heat pump device with a power generation function for measuring the operating load of the engine;
Driving load storage means for storing changes over time of the driving load measured by the driving load measurement means;
An operation load selection means for selecting an engine-driven heat pump device with a power generation function comprising an engine having a small maximum load by comparing the maximum load in the operation load within the set period stored in the operation load storage means;
In response to the demand signal from the power amount comparison means, the power generation control means outputs a start signal to the engine-driven heat pump device with power generation function selected by the operating load selection means to drive the generator. Configure as follows.
As the setting period, a period such as the previous day, the past week, or even a month or year may be set. In any case, the influence of changes in the outside air temperature, etc. are equally applied to the engine-driven heat pump devices with each power generation function, and the overall usage status of each engine-driven heat pump device with each power generation function, etc. This is because the tendency of fluctuations in operating load can be captured.

(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 maximum The generator of the engine-driven heat pump device with a power generation function with a smaller load is driven preferentially to suppress an increase in the amount of received power.
Therefore, the engine load of the engine-driven heat pump apparatus with a power generation function that has a large maximum load that requires a high load operation in the air conditioning operation should not be driven as much as possible, and the engine operating load of the engine-driven heat pump apparatus with a plurality of power generation functions Can be avoided, and it is possible to avoid the load on the engine of some engine-driven heat pump devices with a power generation function, resulting in a decrease in the durability of the system. In addition, it is possible to suppress an increase in the amount of received power while improving the durability of the entire system.

In order to achieve the above object, the invention according to claim 2
The power generation / air conditioning system according to claim 1,
When there are a plurality of engine-driven heat pump devices with the same power generation function at a small maximum load based on the operating load within the setting period stored in the operating load storage means, within the setting period stored in the operating load storage means With an operation time selection means for selecting the engine with a longer engine stop time,
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 operation time selection means 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 the same operation stop state at a small maximum load of the past operation load, The engine-driven heat pump device with a long power generation function is preferentially activated to drive the generator, thereby suppressing an increase in the amount of received power.
Therefore, the operation load of the plurality of engine-driven heat pump devices with a power generation function can be further leveled, and the durability of the entire system can be improved.

In order to achieve the above-described object, the invention according to claim 3
The power generation / air conditioning system according to claim 1 or 2,
When the selected engine-driven heat pump device with a power generation function is in an operating state, the power generation control means outputs a power generation increase signal to the engine-driven heat pump device with a power generation function, and rotates the engine without reducing the air conditioning capacity. It is configured to generate electricity by increasing the number.

(Action / Effect)
According to the configuration of the power generation / air conditioning system according to the third aspect, when power is generated by the engine-driven heat pump device with the power generation function in the operating state, the engine speed is increased without reducing the air conditioning capability.
Therefore, power generation can be performed while maintaining the air conditioning capability in the state before the start of power generation, and an increase in the amount of received power can be suppressed without affecting the air conditioning operation.

As is clear from the above description, according to 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, Based on the change over time, the generator of the engine-driven heat pump device with a power generation function with the smaller maximum load is driven preferentially to suppress an increase in the amount of received power.
Therefore, the engine load of the engine-driven heat pump apparatus with a power generation function that has a large maximum load that requires a high load operation in the air conditioning operation should not be driven as much as possible, and the engine operating load of the engine-driven heat pump apparatus with a plurality of power generation functions Can be avoided, and it is possible to avoid the load on the engine of some engine-driven heat pump devices with a power generation function, resulting in a decrease in the durability of the system. In addition, it is possible to suppress an increase in the amount of received power while improving the durability of the entire system.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an embodiment of a power generation / air conditioning system according to the present invention, in which five engine-driven heat pump devices 2 with a power generation function are installed on the roof of a building 1.
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, etc. 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 in FIG. 3, the receiving / transforming equipment 17 is provided with received power measuring means 22 for measuring 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.
In addition, the engine control unit 25 is provided with an operation load measuring unit 26 that measures the operation load of the engine 3.

A microcomputer 27 is connected to the received power measuring means 22, and a timer 28 and an engine control unit 25 that are reset every 30 minutes are connected to the microcomputer 27.
The microcomputer 27 includes a received power amount calculation unit 29, a received power amount prediction unit 30, a power amount comparison unit 31, an operation load storage unit 32, an operation load selection unit 33, an operation time selection unit 34, and a power generation control unit 35. It has been.

The received power amount calculation means 29 calculates the received power amount by integrating the power measured by the received power measurement means for a predetermined time (30 minutes) set by the timer 28.
The received power amount prediction means 30 calculates and predicts the next received power amount based on the change over time of the received power amount calculated by the received power amount calculation means 29. 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 31, the received power amount calculated and predicted by the received power amount prediction means 30 and the set power amount (the power amount used as the contract reference or a slightly smaller amount of power 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 driving load storage means 32 stores the change with time of the driving load measured by the driving load measuring means 26.
The driving load selection means 33 compares the maximum load in the driving load within the set period (for example, the past one week) stored in the driving load storage means 32 and compares the maximum load with the engine 3 with a power generation function. The type heat pump device 2 is selected.

  The operation time selection means 34 stores the operation load memory when there are a plurality of engine-driven heat pump devices 2 with the same power generation function at a small maximum load based on the operation load within the set period stored in the operation load storage means 32. One having a longer operation stop time within the set period stored in the means 32 is selected.

With the above configuration, in response to a demand signal from the electric energy comparison means 31, the power generation control means 35 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, the driving load selection unit 33 stores the driving load storage unit 32 in response to the demand signal being output when the power amount comparison unit 31 determines that the predicted received power amount exceeds the set power amount. The maximum load in the operation load within the set period is compared, and the engine-driven heat pump device 2 with a power generation function including the engine 3 with the smaller maximum load is selected.

  That is, when there are five engine-driven heat pump devices 2 with a power generation function shown in the graph of FIG. 4A as a change with time of the operation load (engine load), in order to compare the maximum load, The selection is made in the order of A → B → C → D → E.

  Here, when there are a plurality of engine-driven heat pump devices 2 with the same power generation function at the small maximum load based on the operation load within the set period stored in the operation load storage means 32, the operation time selection means 34 Then, the one having the longer operation stop time within the set period stored in the operation load storage means 32 is selected, the corresponding engine-driven heat pump device 2 with a power generation function is selected and a start signal is output, and the generator 6 is selected. Drive. If there is not a plurality of engine-driven heat pump devices 2 with the same power generation function at a small maximum load, a start signal is output to the engine-driven heat pump device 2 with the power generation function selected by the operation load selection means 33, and the power generation is performed. The machine 6 is driven.

That is, as a change with time of the operating load (engine load), when there are five engine-driven heat pump devices 2 with a power generation function shown in the graph of FIG. 4B, when the maximum load is compared, Even if the operation loads A1 and B of the two engine-driven heat pump devices 2 with the power generation function are the same, the operation time is compared and judged, and the longer one of the operation stop time is preferentially selected. The selection is made in the order of B → C → D → E.
Power generation is performed sequentially according to the above procedure.

During the power generation, when the engine-driven heat pump device 2 with a power generation function is in an operating state, power is generated by increasing the engine speed without reducing the air conditioning capability.
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 the amount of generated power is increased, 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.

  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 provided with a variable capacity type compressor, and (b) is a front view of an engine-driven heat pump device with a power generation function provided with a fixed capacity type compressor. FIG. It is a block diagram which shows the control system of an Example. It is a graph which shows a time-dependent change of driving | running load (engine load).

Explanation of symbols

2 ... Engine-driven heat pump with power generation function
3 ... Engine
DESCRIPTION OF SYMBOLS 6 ... Generator 10 ... Compressor 19 ... Refrigerant circuit 20 ... Indoor heat exchanger 21 ... Expansion valve 22 ... Received electric energy measuring means 26 ... Operating load measuring means 29 ... Received electric energy calculating means 30 ... Received electric energy predicting means 31 ... Electric energy comparison means 32 ... Operating load storage means 33 ... Operating load selection means 34 ... Operating time selection means 35 ... Power generation control 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
Operating load measuring means provided in each engine-driven heat pump device with a power generation function for measuring the operating load of the engine;
Driving load storage means for storing changes over time of the driving load measured by the driving load measurement means;
An operation load selection means for selecting an engine-driven heat pump device with a power generation function comprising an engine having a small maximum load by comparing the maximum load in the operation load within the set period stored in the operation load storage means;
In response to the demand signal from the power amount comparison means, the power generation control means outputs a start signal to the engine-driven heat pump device with power generation function selected by the operating load selection means to drive the generator. A power generation / air conditioning system characterized by the above configuration. The power generation / air conditioning system according to claim 1,
When there are a plurality of engine-driven heat pump devices with the same power generation function at a small maximum load based on the operating load within the setting period stored in the operating load storage means, within the setting period stored in the operating load storage means With an operation time selection means for selecting the engine with a longer engine stop time,
A power generation / air conditioning system in which power generation control means outputs a start signal to the engine-driven heat pump device with power generation function selected by the operation time selection means to drive a generator. The power generation / air conditioning system according to claim 1 or 2,
When the selected engine-driven heat pump device with a power generation function is in an operating state, the power generation control means outputs a power generation increase signal to the engine-driven heat pump device with a power generation function and rotates the engine without reducing the air conditioning capability. A power generation and air conditioning system that generates electricity by increasing the number.

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