Solar water heater antifreezing system capable of exchanging heat through direct contact of gas and liquid

Abstract

The invention discloses a solar water heater antifreezing system capable of exchanging heat through direct contact of gas and liquid. The solar water heater antifreezing system comprises a solar thermal collector, a direct contact heat exchanger, a gas storage box and a geothermal buried pipe, wherein the direct contact heat exchanger is used for perform circulating heat exchange through direct contact of high-temperature gas and water in the solar thermal collector to improve the temperature of the water in the solar thermal collector; the gas storage box is connected with a high-temperatureinlet of the direct contact heat exchanger through an electromagnetic valve; and the geothermal buried pipe is connected with the gas storage box through a gas boosting pump. Geothermal energy in soilis absorbed by gas filled in the geothermal buried pipe and the low-temperature water in the solar thermal collector is heated by a gas and liquid direct contact heat exchange mode, so that the phenomenon that the solar thermal collector is frozen in low-temperature weather is avoided, heat exchange speed is high, efficiency is high and energy is saved.

Description

technical field

[0001] The invention relates to the field of gas-liquid mixed heat exchange, in particular to an antifreeze system for a solar water heater in which gas-liquid directly contacts and exchanges heat. Background technique

[0002] In recent years, due to the advantages of energy saving, environmental protection, safety and convenience, solar water heaters have been rapidly popularized. However, in some areas, due to the low temperature in winter or rainy and snowy weather, the heat collector components are prone to freezing and the surface is covered by snow, especially the heat collecting tubes in the water heater, the water inside is easy to freeze and damage the heat collecting tubes . For flat-plate solar heat collectors, antifreeze-type water heaters are usually used. The antifreeze liquid absorbs solar heat and then conducts indirect heat exchange with water, resulting in a decrease in heat exchange efficiency. For emptying antifreeze measures, manual in...

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