JPS6323464B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Rankine cycle drive refrigerator which obtains driving force for a compressor by a Rankine cycle engine and performs a refrigeration cycle.

Conventionally, refrigerators using the Rankine cycle can be operated at relatively low temperatures (around 100°C) as a heating source, so as shown in Figure 1, solar heat or waste heat is used as a heat source and a heating medium (such as fluorocarbons) is used in an evaporator. The gas is evaporated in step 2 to generate high-temperature, high-pressure gas, converted into low-pressure gas in expander 1 to simultaneously obtain driving force, and then cooled and liquefied in condenser 3.

However, since most of these low-temperature heat sources are irregular, an electric motor 8 is provided as an auxiliary source, and when the amount of heat is insufficient, the electric input is used to turn the electric motor 8 and drive the compressor 7. .

However, looking at the current electricity situation, there is a peak load in the afternoon on a sunny day during cooling periods, and it is becoming impossible to deal with this situation without building power plants. This greatly reduces the load factor and is not economical.

The present invention was made to solve the above-mentioned drawbacks. In order to suppress power peaks, the heat storage tank is heated with a non-electric high-temperature heat source (oil, gas, etc.) during or before peak hours, and the Rankine cycle is activated. To provide a Rankine cycle refrigerator that performs a refrigeration cycle without increasing power demand by adding heat to the refrigerator.

Hereinafter, one embodiment of the present invention will be described based on FIG. 2. In the figure, 1 is an expander, 2 is an evaporator, 3 is a condenser, 4 is a pump, 5 is a heating device, and 6
1 is a cooling device, 7 is a compressor, 8 is an auxiliary electric motor, 9 is a cooling tower, 10 is a pump, 11 is heat source piping such as solar heat or waste heat, 12 is a timer and control device, 13 is a temperature or pressure detector, 14 is a heat storage tank. This heat storage tank 14 has an evaporator 2 and a heat source pipe 11 installed therein, and a non-electric heating device 5 as an auxiliary high temperature heating source.
is located at an external location where heat can be supplied.

Next, we will discuss the operation. solar heat as a heat source,
The heat storage tank 14 is used when sufficient exhaust heat can be secured.
The evaporator 2 is heated to evaporate the heat medium, and the gas is sent to the expander 1 as high-temperature, high-pressure gas, which drives the compressor 7 and connects the condenser, expansion device,
The refrigeration cycle of a well-known refrigeration cycle device (not shown) including an evaporator is operated to perform cooling (or heating). Further, the high temperature and high pressure gas sent to the expander 1 is expanded to become a low pressure gas and is discharged from the expander 1. After this gas is liquefied in the condenser 3, it is again pumped under pressure by the pump 4 and reaches the evaporator 2, where this operation is repeated.

However, these heat sources are usually irregular, and even if the auxiliary motor 8 is used, it may not necessarily be possible to obtain a sufficient heat source around noon in August, when the cooling load is the highest and the power consumption is at its peak. There was no limit.

In this system, the evaporator 2 can be heated by the heating device 5, so in the event of power outage for cooling during power peak times that may occur in the future, the heat storage tank can be heated by the timer/control device 12 before that, and the Rankine cycle refrigerator can be heated. The evaporator 2 can also be operated during operation. Further, the temperature (pressure) detector 13 can keep the evaporation temperature and pressure constant, and the driving force of the cooling compressor 7 can be kept stable.

As mentioned above, since the timer/controller that drives the heating device has a timer function and is configured to control the amount of heating by the heating device based on the detected temperature or pressure inside the heat storage tank, it is possible to avoid power peaks. Since the heat storage tank can be heated to a predetermined temperature or pressure in advance, there is no need to use too much electricity during peak electricity hours, and accidents such as power outages due to power shortages can be prevented. There is an effect that can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional Rankine cycle refrigerator, and FIG. 2 is a circuit diagram of a Rankine cycle refrigerator of the present invention. The same reference numerals in the figures indicate the same or equivalent parts, 1 is an expander, 2 is an evaporator, 3 is a condenser, 5 is a heating device, 7 is a compressor, 12 is a timer/controller, and 14 is a heat storage tank. be.

Claims (1)

[Claims] 1. An evaporator, heat source piping for solar heat, exhaust heat, etc. to heat the evaporator, and a non-heat source that heats the evaporator to compensate for the shortage of heat supply from the heat source piping. In a Rankine cycle drive refrigerator, the driving force is obtained from a Rankine cycle engine that performs a Rankine cycle with an auxiliary high-temperature heating source of electric power, and a refrigeration cycle is performed by driving a compressor that is auxiliary driven by an electric motor. A heat storage tank in which a high-temperature heating source is disposed externally and a heat source piping and an evaporator are installed inside, a detector that detects the temperature or pressure inside the heat storage tank, and a detector that detects the temperature or pressure inside the heat storage tank, and according to the detection result of the detector. control the amount of heating by the auxiliary high temperature heating source to keep the temperature or pressure inside the heat storage tank constant, and has a timer function set in advance so that the auxiliary high temperature heating source operates at a predetermined time. A Rankine cycle-driven refrigerator characterized by being equipped with a timer and a controller.