SU1726924A1 - Hot water supply sun plant - Google Patents

Abstract

This invention relates to a hot water solar system. The invention is aimed at improving the reliability and simplifying the design of a solar water supply system for hot water. The solar water supply system contains a solar energy collector 1, connected to the direct and return pipelines 2 and 3 with 8 12 10 storage tank 4, and communicated with it through the connecting pipes capacity 8, cold water supply pipe 6 and hot extraction pipe 5 water. New in the solar installation is the performance of the tank 8 in the form of an expansion tank, placing it in the upper zone of the accumulator tank, supplying the extraction pipeline with a jet pump 11 and connecting the expansion tank to its passive nozzle by means of an overflow siphon. In the process of heating water in the collector 1, thermosiphon circulation occurs, the volume of water increases, after which the most heated water through the pipe 9 is poured into the tank 8, the air is displaced through the air tube 10. The hot water is removed from the upper zone of the storage tank torus 4 by creating a vacuum in the overflow siphon with a 12 jet pump 11. 1 sludge. cl

Description

The invention relates to hot water supply, mainly to hot water heliosystems.

The installation of a hot water supply is known, comprising a solar energy collector, the supply and return pipelines of which are connected to an accumulator tank located above it, connected to a hot water supply pipeline with a consumer, and a cold water supply device with a level control.

The disadvantage of the installation is the placement of the storage tank below the supply and return pipelines and, as a result, the inability to control the temperature of the extracted hot water.

Also known is a hot water solar system containing a storage tank in the form of two compartments separated by a vertical partition and interconnected, with one compartment being consumable and communicating with the water supply and direct solar collector piping and the other accumulating and connected with the return pipe of the solar energy collector and the lower part - with the consumer, additionally communicated with the supply compartment through the control valve. The accumulator compartment is provided with a level gauge connected to the valve actuator and is additionally communicated with the expenditure compartment through a check valve.

The disadvantage of this solar hot water supply system is the presence of several valves designed to control the flow of heat transfer fluid in the solar collector circuits, make-up and water intake, as well as a level tracking system, which reduces the reliability of the installation and somewhat complicates its design.

The aim of the invention is to increase the reliability and simplify the design of a solar hot water supply.

The goal is achieved by the fact that in a well-known solar power plant a hot water supply containing a solar energy collector communicated with a storage tank and connected to it by means of connecting nozzles located in the latter, and pipelines for supplying cold and collecting hot water. of which are additionally connected to the tank, the tank is made in the form of an expansion tank, the latter being installed in the upper zone of the storage tank, connecting their branch pipe to the upper zones, and the pipe od selection provided with a jet pump and an expansion tank connected to the nozzle by means of its passive overflow siphon.

At the same time, the minimum volume of the expansion tank is equal to the difference between the volumes of cold and hot coolants that completely fill the storage tank,

0 according to the following formula:

 .

five

0

five

0

five

0

five

V2 where Vi is the volume of the storage tank;

Va is the volume of the expansion tank;

ft is the coefficient of volumetric expansion of the coolant;

At is the difference between the temperature of the feed water and the maximum attainable temperature of the water in the storage tank.

The implementation of the tank in the form of an expansion tank makes it possible to compensate for the thermal expansion of water as it warms up and, moreover, the tank is unloaded by pressure.

Placing the expansion tank in the upper zone of the storage tank and connecting the connecting pipe to these zones ensures the supply of the warmed-up water directly to the expansion tank, preventing its mixing with the total volume of water, and since the expansion can is surrounded by water whose temperature is close to temperature water in the expansion tank itself, the heat loss is minimal.

When the main stream of water flows through the active nozzle of the jet pump, a negative pressure occurs in its passive nozzle, as a result of which hot water accumulated in the expansion tank is removed. Hot water is also withdrawn by means of an overflow siphon already filled with water, and a jet pump is needed only at the beginning of the cycle, when the inlet siphon is not yet filled with water.

Thus, the use of a tank in the form of an expansion tank, placing it in the upper zone of the storage tank, as well as supplying the extraction pipeline 0 with a jet pump and connecting the expansion tank to its passive nozzle using a siphon overflow siphon, improves the reliability and simplifies the design of solar power plants. water supply, since this eliminates controlled valves and other moving parts.

The drawing shows schematically the proposed solar system for hot water supply in the variant of thermosiphon circulation of heat-transfer fluid.

The solar station contains a solar energy collector 1, connected by pipelines 2 and 3 with a storage tank 4 and communicated with it by means of connecting nozzles 8, made in the form of an expansion tank, located in the upper zone of the storage tank 4, cold water supply pipe 6 and pipeline 5 for the extraction of hot water. The latter additionally contains a jet pump 11, the passive nozzle of which is connected via a pipe 12, made in the form of an overflow siphon, to a tank 8 connected to a storage tank by a branch pipe 9 with an air tube 10. To maintain a constant water level in the storage tank The torus 4 serves as a float valve 7.

Solar power plant works as follows.

In the initial state, the solar system is flooded with water through pipeline b to level A-A, after which the float valve is activated and the water supply stops. In the process of heating water in the solar energy collector 1, a thermo-siphon regulation occurs and the water in the storage tank 4 gradually warms up. At the same time, its volume increases and its level in a solar plant rises to position BB. After that, a part of the most heated water through the U-shaped pipe 9 is poured into the expansion tank 8, the air is displaced

cutting the air tube 10. The consumer receives hot water mainly from the upper zone of the storage tank 4. In the selection process, the flow of water passing through the jet pump 11 creates a vacuum in the overflow siphon 12, resulting in the accumulation in the expansion tank most The heated water is sucked into the pipe 5 and is also fed to the consumer. Thus, the proposed solar plant eliminates the need to use control valves and other moving parts, which simplifies its design and increases its reliability.

Claims (1)

Invention Solar water supply system comprising a solar energy collector in communication with a storage tank and connected to it by means of connecting pipes a container placed in the latter and a cold supply and hot water supply pipeline, the latter of which is additionally connected capacity, in order to increase the reliability and simplify the design of the solar plant, the tank is designed as an expansion tank, the latter being installed in the upper zone of the accumulator tank and connecting the branch pipe connected to them their upper zones, and the selection line is provided with a jet pump and an expansion tank connected to the nozzle by means of its passive overflow siphon.