JPS58217167A - Heat apparatus utilizing solar heat - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a solar heating system.

A conventional solar heating system was constructed as shown in FIG. That is, in this FIG. 1, 1 is a heat collector, 2 is a three-way valve, 3 is an auxiliary boiler, 4 is a heat medium radiator, and 5 is a heat medium pump. When there is solar radiation, the three-way valve 2 is switched so that the heat medium flows in the following order: heat collector 1 → three-way valve 2 → heat medium radiator 4 → heat medium pump 5 → heat collector 1. , the heat medium radiator 4 was emitting heating output. If there is still no solar radiation, switch the three-way valve 2 so that the flow of the heat medium is in the order of the auxiliary boiler 3 -> the three-way valve 2 -> the heat medium radiator 4 - the heat medium pump 5 -> the auxiliary boiler 3. The boiler 3 inputs heat, and the heat medium radiator 4 generates heating output.

The coefficient of performance when there is an amount of solar radiation in the above conventional solar heating system is defined as (coefficient of performance=heating output/heating medium pump electricity consumption). When there is sufficient solar radiation, the coefficient of performance becomes a high value, ie, coefficient of performance>1. However, when there is no solar radiation, it is defined as (coefficient of performance - heating output / combustion amount of auxiliary boiler 3), and the coefficient of performance is a low value of 1, so the heating efficiency was not very good. .

FIG. 2 shows another conventional example, and the same parts as in FIG. 1 are given the same numbers.

In FIG. 2, 6 is a heat pump cycle, and this heat pump cycle 6 is composed of a compressor 7, an evaporator 8, an expansion valve 9, a heat pump radiator 10, and a four-way valve 11. The heat pump cycle 6 includes an electric motor 1
2 drives the compressor 7, and the evaporator 8 utilizes solar heat to generate heating output from the heat pump radiator 10. The coefficient of performance in this case is defined as (coefficient of performance - heating output/electricity consumption of the electric motor 12). In this case, even when there is no solar radiation, the coefficient of performance is >1 and the efficiency is good. However, when there is sufficient solar radiation, comparing the coefficient of performance of conventional example M shown in Figure 1 with the coefficient of performance of conventional example B shown in Figure 2, (coefficient of performance of conventional example A > conventional example B) performance coefficient)
Therefore, Conventional Example B could not be said to be good either. The electricity consumption of the electric motor was still high.

In view of the above conventional drawbacks, it is an object of the present invention to prevent a decrease in the coefficient of performance during auxiliary operation when there is no solar radiation, and to reduce operating electricity consumption when there is solar radiation. It is something.

The basic configuration of the present invention to achieve the above object includes a Rankine engine, a heat pump cycle driven by the Rankine engine, a heat collector, a heat medium radiator, a heat medium pump, and a three-way valve. If the temperature of the heating medium piping and heating medium is higher than the set value, the three-way valve is switched so that the heating medium flows to the heating medium radiator, and the operation of the working fluid pump of the Rankine engine is stopped, and the heating medium is reversely turned off. If the medium temperature is lower than the set value,
The three-way valve is switched so that the heat medium flows to the generator of the Rankine engine, and a control circuit is configured to operate the working fluid pump.

By having the above-mentioned structure, when the amount of solar radiation is low (when the heating medium temperature is lower than the set value), the heating medium flows into the generator of the Rankine engine, and the working fluid pump is operated, thereby generating the Rankine engine. The heat pump cycle is driven by the engine to perform heating operation, and conversely, when the amount of solar radiation is large (when the heat medium temperature is higher than the set value), the operation of the working fluid pump is stopped, and the Rankine engine and the heat pump cycle are activated. operation is stopped, and the heat medium flows into the heat medium radiator to generate heating output. Therefore, even when the amount of solar radiation is low, efficient operation can be performed by heat pump operation driven by the Rankine engine, and when there is sufficient solar radiation. Since the heating medium directly generates the heating output, it can be operated more efficiently.

Hereinafter, one embodiment of the present invention will be described based on FIG. 3. In FIG. 3, the same parts as in FIGS. 1 and 2 are given the same numbers.

In FIG. 3', 12 is a Rankine engine, and this Rankine engine 12 is composed of an expander 13, a Rankine condenser 14, a working fluid pump 15, and a generator 16. 17
is a heat medium pipe through which a heat medium flows, and this heat medium pipe 17 is connected to the heat collector 1. Three-way valve, heat medium radiator4. Heat medium pump 5. The generators 16 of the Rankine engine 12 are connected. 18 is a control circuit.

Next, the operation of the solar heating system having the above configuration will be explained. First, when there is sufficient solar radiation, the heat medium temperature is higher than the set value, so the control circuit 18 switches the three-way valve 2 so that the heat medium from the collector 1 flows to the heat medium radiator 4. Further, the control circuit 18 stops the operation of the working fluid pump 15 of the Rankine engine 12. As a result, Rankine engine 12d-O.-1.

Since the heat medium does not flow into the engine and the working fluid pump 15 also stops operating, the operation of the Rankine engine 12 stops. Furthermore, since the compressor is not driven by the expander 13 of the Rankine engine 12, the heat pump cycle 6 also stops operating. Conversely, when the amount of solar radiation decreases, the heat medium and temperature become lower than the set value, so the control circuit 18 causes the three-way valve 2 to flow the heat medium from the collector 1 into the generator 16 of the Rankine engine 12. In addition to issuing the switching signal, the control circuit 18 also issues an operating signal to the working fluid pump 15 of the Rankine engine 12.

As a result, the Rankine engine 12 is heated by the heating medium, and the working fluid pump 15 is also operated, so that the expander 13 outputs an output. As a result, since the compressor 7 of the heat pump cycle 6 is also driven by the expander 13, heating output is generated from the heat pump radiator 1°.

In this way, when there is sufficient solar radiation and the heat medium temperature is higher than the set value, the heat medium in the collector 1 is directly radiated by the heat medium radiator 4 to generate heating output, so the performance in this case is The coefficient is (coefficient of performance=heating output/electricity consumption of heat medium pump 6), and the most efficient operation can be achieved. Furthermore, when the amount of solar radiation decreases and the heat medium temperature is lower than the set value, the Rankine engine 12 is operated and the heat pump cycle 6 generates heating output, so the coefficient of performance is ([coefficient of performance - heating output / heat medium pump Electricity consumption of 5 + working fluid pump 1
5 electricity consumption)]. This is compared with the coefficient of performance (coefficient of performance - heating output/electrical consumption of electric motor) explained in the conventional example B of FIG. 〉Electricity consumption of the electric motor〉) Therefore, the coefficient of performance shown in one embodiment of the present invention is high. In other words, even when switching to heat pump operation due to a decrease in solar radiation, the coefficient of performance remains high.

As described above, according to the solar heating system of the present invention, when there is sufficient solar radiation and the heating medium temperature is higher than the set value, the heating output is directly emitted from the heating medium radiator, and conversely the solar radiation decreases. However, if the heat medium temperature is lower than the set value, the control circuit should control the Rankine engine to drive the heat pump cycle and generate heating output. can secure a high coefficient of performance, but if the amount of solar radiation decreases, the coefficient of performance will drop dramatically.
Alternatively, even in a heat pump cycle that can secure a coefficient of performance when the amount of solar radiation decreases, the problem of high electricity consumption of the electric motor is eliminated; It is possible to ensure a high coefficient of performance by dissipating heat from the machine, and even when the amount of solar radiation decreases, the heat pump cycle is driven by the Rankine engine, which has the excellent effect of saving electricity consumption. .

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram showing a conventional solar heating device, Fig. 2 is a system configuration diagram showing another conventional example, and Fig. 3 is a system configuration diagram of a solar heating device showing an embodiment of the present invention. It is. 1... Heat collector, 2... Three-way valve, 4... Heat medium radiator, 5... Heat medium pump, 6...
... Heat pump cycle, 7 ... Compressor, 8
...Evaporator, 919900. Expansion valve, 10...
...Heat pump radiator, 11...Four-way valve, 12
... - Rankine engine, 13 ... Expander, 1
4...--Rankine condenser, 15... Working fluid pump, 16... Generator, 17...
Heat medium piping, 18.・=[l control circuit.

Claims (1)

[Claims] A Rankine engine consisting of a generator, an expander, a Rankine condenser, and a working fluid pump, a compressor, and an evaporator. A heat pump cycle consisting of a heat pump radiator, an expansion valve, and a four-way valve, and in which a compressor is driven by the expander of the Rankine engine to generate heating output, a collector for collecting solar heat, and the collector a heat medium radiator that generates a heating output using a heat medium from the collector, and a three-way switch that switches the heat medium from the heat collector so that it flows in one direction to the generator of the Rankine engine and in the other direction to the heat medium radiator. a valve, a heat medium pump that circulates the heat medium, the heat collector, the three-way valve, the heat medium radiator, the heat medium pump, and the heat medium piping that connects the generator of the Rankine engine; If the temperature is higher than the set value, switch the three-way valve to the heat medium radiator side, stop the operation of the working fluid pump of the Rankine engine, and stop the operation of the Rankine engine and the heat pump cycle; and a control circuit that switches the three-way valve to the generator side of the Rankine engine and operates the working fluid pump to operate the Rankine engine and the heat pump cycle when the heat medium temperature is lower than the set value. The constructed solar heating system.