Pressure bearing type solar water heater

Abstract

The invention relates to a pressurized solar energy water heater, which belongs to the technical field of application of solar energy. The water heater mainly comprises a water storage liner and a solar heat collection device, wherein the solar heat collection device mainly comprises a transverse collector tube and a vertical header; one end of the collector tube is communicated with the header to form a primary heat exchange circulation loop; the header is obliquely arranged, and is provided with a U-shaped heat exchange tube with two branch tubes inside; the U-shaped heat exchange tube is obliquely arranged along with the header, and the two branch tubes are arranged on a high position and a low position respectively; and the two branch tubes which are arranged on the high position and the low position are extended upwards respectively and communicated with a circulating joint corresponding to the water storage liner, so as to form a secondary heat exchange circulation loop. The invention skillfully solves the technical problems through scientific and reasonable pipeline arrangement and provides an economic, practical and high-efficiency heat exchange path for the naturally circulated pressurized solar energy water heater. As proved by experiments, the heat exchange effect of the pressurized solar energy water heater is full, heat dissipation is small, and the solar heat gain per unit area is improved by 20 to 30 percent.

Description

technical field [0001] The invention relates to a solar water heater, in particular to a pressure-bearing solar water heater, which belongs to the technical field of solar energy application. Background technique [0002] According to the applicant's understanding, existing solar water heaters mainly include non-pressure bearing type and pressure bearing type. The water storage container of the non-pressurized solar water heater is directly connected with the solar heat collector tube, so the user directly uses the hot water heated by the solar energy without intermediate heat exchange links. Since there is no pressure in the water storage container, there is a shortcoming of insufficient impact of the water flow during use; in addition, since antifreeze cannot be added to the water, the external water pipe connected to the solar collector pipe may freeze in cold seasons. The water storage container of the pressurized solar water heater (commonly referred to as the inner ta...

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Problems solved by technology

Due to the use of U-shaped tubes, this product overcomes the shortcomings of small heat exchange area, uncompact structure, and untidy shape of the above-mentioned patent application, but there are problems in the principle of heat exchange: due to the U-shaped pressure-bearing heat exchange tube left, The pipes on the right side are symmetrically distributed, and the water inlet and outlet are at the same height. It is theoretically difficult to form a thermosiphon phenomenon between the water inlet and the outlet due to temperature difference, and it is very difficult to start the natural circulation of water flow, so the thermal efficiency is very low.

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