JPH031897B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cogeneration internal combustion power generation device installed as a heat source and power source for air conditioning equipment.

[Technical Background of the Invention and its Problems] Generally, hotels, hospitals, buildings, factories, etc. are equipped with air conditioners for heating and cooling the rooms. The heat source and power source of this air conditioner are usually obtained from a commercial power source, but in recent years, the heat source and power source are sometimes obtained from a cogeneration internal combustion power generation facility for the purpose of energy saving. This internal combustion power generation equipment is
The generator is configured to be driven by the internal combustion engine to supply electric power from the generator and exhaust heat energy from the internal combustion engine to the air conditioner.

By the way, internal combustion engines, especially gas turbines,
Even though the waste heat energy emitted is much higher than the energy expended to drive the load, traditional internal combustion power generation equipment is the most efficient way to meet the power demands of air conditioners from the generator. Emphasis is placed on controlling the power supply, and the waste heat energy emitted from the internal combustion engine is not fully utilized.

[Object of the Invention] An object of the present invention is to provide a cogeneration internal combustion power generation device that increases the utilization of exhaust heat energy of an internal combustion engine and saves energy.

[Summary of the Invention] The cogeneration internal combustion power generation device according to the present invention detects the temperature difference between the actual temperature in a room being air-conditioned by an air conditioner and a set temperature, and calculates the amount of heat supplied to the air conditioning equipment based on the temperature difference. , and further calculates the desired generator output from the relationship between the calorific value of the calculation result, the generator output stored in advance, and the exhaust fuel amount of the internal combustion engine,
The power load amount of the generator is controlled so that the output of the generator becomes the desired generator output determined above.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 is an internal combustion engine that drives a generator 2, 3 is a heat exchanger that heats a fluid with exhaust heat energy discharged from the internal combustion engine 1, and 4
is a pump driven by a motor 4' that transports the fluid heated by the heat exchanger 3 to the radiator 5a of the air conditioning equipment 5; 6 is the electric power load of the air conditioning equipment 5, etc.;
This electric power load 6 can select whether electric power is supplied from the generator 2 or from the commercial power source 8 by means of a changeover switch 7 provided for each electric power load 6.

9 is an air conditioning load detector that detects the temperature difference between the actual temperature in the room air-conditioned by the air conditioner 5 and a set value; 10 is a fluid supplied to the air conditioner 5 based on the temperature difference detected by the air conditioner load detector 9; The desired generator output is calculated from the calculation result and the relationship between the generator output and the exhaust heat amount of the internal combustion engine as shown in FIG. 2, which is stored in advance, and the output of the generator 2 is This is a power load control device that switches the changeover switch 7 provided in each power load 6 to the commercial power supply side or the generator side so as to obtain the desired generator output determined above. Here, when controlling the changeover switch 7 by the power load control device 10, it is also possible to assign priorities and control based on these priorities. Note that the above-described control can be easily performed by constructing the power load control device using a microcomputer.

Next, control of the cogeneration internal combustion power generation facility configured as described above will be explained. First, when the indoor temperature is lower than the set temperature, the air conditioning load detector 9 detects the temperature difference, and a signal corresponding to the detected temperature is sent to the power load control device 10.

Based on the signal, the power load control device 10 calculates the amount of heat of the fluid supplied from the heat exchanger 3 to the air conditioner 5, that is, the extent to which the exhaust heat energy of the internal combustion engine 1 is insufficient. This calculation is performed in consideration of various conditions such as the size of the room air-conditioned by the air conditioning equipment 5 or the heat dissipation capacity of the air conditioning equipment 5.

Then, this calculation result and the pre-stored second
A desired generator output is determined from the relationship between the generator output and the exhaust fuel amount of the internal combustion engine as shown in the figure, and each power load 6 is adjusted so that the output of the generator 2 becomes the desired generator output determined above. Changeover switch 7 installed in
Switch to the generator side.

When one or more electric power loads 6 are input to the generator 2 in this way, the load on the internal combustion engine 1 increases,
The exhaust heat energy discharged from the internal combustion engine 1 increases. As the exhaust heat energy increases, the temperature of the fluid heat exchanged by the heat exchanger 3 increases, and the temperature in the room air-conditioned by the air conditioner 5 approaches the set value.

Next, when the indoor temperature is higher than the set temperature, the power load control device 10 switches the changeover switch 7 to the commercial power source side, and the output of the generator is reduced. In this way, when the electric power load input to the generator 2 is reduced, the load on the internal combustion engine 1 is reduced, and the exhaust heat energy discharged from the internal combustion engine 1 is reduced. When the exhaust heat energy decreases, the temperature of the fluid heat exchanged by the heat exchanger 3 decreases, and the temperature in the room air-conditioned by the air conditioner 5 approaches the set value.

[Effects of the Invention] As described above, according to the cogeneration internal combustion power generation device of the present invention, the power load amount of the generator is adjusted depending on the air conditioning condition of the room air-conditioned by the air conditioner, and the exhaust heat energy of the internal combustion engine can be used. Since the amount of heat from the air conditioner is controlled by increasing or decreasing the amount of heat, the exhaust heat energy of the internal combustion engine can be utilized more effectively, resulting in energy savings.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a cogeneration internal combustion power generation apparatus according to the present invention, and FIG. 2 is a characteristic diagram showing the relationship between power generation output and exhaust heat amount. 1... Internal combustion engine, 2... Generator, 3... Heat exchanger, 5... Air conditioner, 6... Power load, 7...
Changeover switch, 8...Commercial power supply, 9...Air conditioning load detector, 10...Power load control device.

Claims (1)

[Claims] 1. A generator driven by an internal combustion engine, an air conditioner that uses the exhaust heat energy of the internal combustion engine as a heat source, and a temperature difference between the actual temperature and the set temperature in the room air-conditioned by the air conditioner. and an air conditioning load detector that detects the temperature difference detected by the air conditioning load detector, and calculates the amount of heat to be supplied to the air conditioner from the temperature difference detected by the air conditioning load detector. a power load control device that determines a desired generator output from the relationship with the amount and controls the power load amount of the generator so that the output of the generator becomes the desired generator output that has been determined. Power generation equipment.