SU1576803A1 - Solar heat supply system - Google Patents

Abstract

The invention relates to the field of solar technology and allows for an increase in efficiency by keeping the temperature of the heat transfer fluid at the entrance to the solar collector to a minimum. The solar heat supply system includes a solar collector 1 connected by means of supply 2 and return 3 pipelines with heat exchanger 4, and a pump 5 installed in return pipe 3. The system further comprises heated and cooled heat storage tanks 6 and 7, respectively, the first of which is installed on the supply pipe 2, and the second between the pump 5 and the heat exchanger 4 on the return pipe 3. The section of the latter after the heat exchanger 4 is connected using a circulation pipe 8 with an yuschim valve 9 to the feed pipe 2 between the solar collector 1 and the accumulator tank 6-heated heat medium. After the latter, an additional pump 10 is installed on the supply pipe 2, and on pipes 2 and 3 after and before the accumulator tanks 6 and 7 - control valves 11-14. The invention provides a reduction in heat loss of the solar collector. 1 il.

Description

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The invention relates to solar technology, in particular, to devices for heating a heat transfer fluid due to solar energy.

The purpose of the invention is to increase the efficiency by keeping the temperature of the coolant at the entrance to the solar collector to a minimum.

The drawing shows a solar heat transfer system, a general view.

The system contains a solar collector 1, connected by means of a supply 2 and return 3 pipelines to a heat exchanger 4, and a pump 5 installed in the return pipeline 3. The system further comprises storage tanks 6 and 7 of the heated and cooling heat carriers, the first of which is installed in the supply line 2, and the second between the pump 5 and the heat exchanger 4 in the return pipe 3, the section of the latter after the heat exchanger 4 is connected via a circulation pipe 8 with a regulating valve 9 to the supply the pipeline 2 between the solar collector 1 and the storage tank 6 of the heated coolant, after the latter, an additional pump 10 is installed on the supply pipe 2, and on the pipelines 2 and 3 after and before the storage tanks 6 and 7 - control valves 11-14. The system also has a distribution tank 15 with pipelines 16 and 17 and pumps 18 and 19.

The solar heating system operates as follows.

In the day period, the valves 11-14 are open, the valve 9 is closed. The pumps 5, 10, 18 and 19 are turned on. In this case, the cooled coolant from the storage tank 7 passes by a constant flow through the solar collectors 1, where it is heated depending on the radiation arrival and the outdoor air temperature, and enters the storage tank. At the same time, in accordance with the heat supply schedule, the heated coolant is pumped out of the storage tank, which passes through the heat exchanger 4 and is directed to the storage tank, where it is mixed with the heat transfer fluid accumulated during the night. The flow rate of the coolant flowing through the heat exchanger 4 is variable, and its value is less than the flow rate of the heat transfer fluid passing through the collectors 1, so the storage tank 6 is filled and the storage tank 7 is empty.

The night period (ie, the period of the day, in which there is no solar radiation arrival) is conventionally divided into two parts. In the first part of the night period, valves 9 and 12 are open, the rest are closed. Pumps 10, 18 and 19 are on. Pump 5 is turned off. The coolant from the storage tank 6 is pumped by the pump 10 through the heat exchanger 4 and is returned through the circulation pipe 8 to the storage tank. Such circulation is carried out until the temperature of the coolant at the exit from the heat exchanger drops to the minimum level 4 according to the conditions of the heat exchanger. In the second part of the night period, valves 12 and 13 are open, the rest are closed.

When the temperature of the heat transfer medium possible under the conditions of heat exchange at the exit of the heat exchanger 4 closes, the valve 13 opens and the cooled heat transfer medium from the storage tank 6 through the heat exchanger 4 is discharged into the storage tank 7 to fill it

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The net water supplied by the pump 18 through the heat exchanger 4 to the distribution tank 15 is stratified according to the height of the tank depending on the heating, in connection with which

5 To the consumer, hot water of the required temperature is directed in accordance with the daily schedule.

The flow of the coolant in the collectors with low temperature provides a reduction of heat loss.

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Claims (1)

Invention Formula A solar heating system comprising a solar collector connected by a feed and return 5 pipelines with a heat exchanger, and a pump installed on the return pipe, characterized in that, in order to increase efficiency by maintaining the temperature of the coolant at the inlet to the solar collector 0 at the minimum level, the system additionally contains heated and cooled coolant storage tanks, the first of which is installed on the supply pipe, and the second between the pump and the heat exchanger on the back side, 5 of the latter, after the heat exchanger, is connected by means of a circulation pipeline with a control valve to the supply pipeline between the solar collector and the storage tank of the heated coolant, after the latter an additional pump is installed on the supply pipe0 and before the storage tanks - control valves .