Separated type solar water heater provided with U-shaped tube heat collector and enamel outer interlayer heat exchanger

Abstract

The invention relates to a separated type solar water heater provided with a U-shaped tube heat collector and an enamel outer interlayer heat exchanger. The separated type solar water heater comprises a water tank and the heat collector, wherein a liner is mounted in the water tank; the liner and a liner of an interlayer form the enamel outer interlayer heat exchanger; an air exhaust tube, a liquid injection port, a medium circulation inlet and a medium circulation outlet are arranged at the outer end of the heat exchanger; both the medium circulation inlet and the medium circulation outlet penetrate through the outer wall of the water tank and are connected with a medium circulation pipeline; the liner is provided with a water inlet tube and a water outlet tube; the water inlet tube and the water outlet tube penetrate through the water tank and are connected with an external pipeline; a vacuum tube is mounted in a frame of the heat collector and connected with the frame of the heat collector through a seal ring; a stainless U-shaped tube is inserted into the vacuum tube; the upper end of the U-shaped tube is a hot tube section, the lower end of the U-shaped tube is a cold tube section, and the two ends of the U-shaped tube are connected with a medium heat collection outlet and a medium heat collection inlet respectively; and the medium heat collection outlet and the medium heat collection inlet are connected with the medium circulation inlet and the medium circulation outlet of the water tank respectively, so that a circulation loop is formed. According to the separated type solar water heater, the U-shaped tube is added and filled with a medium, and no water passes through the vacuum tube, so that scaling is avoided; and even the separated type solar device is used for a long time, the heat collection efficiency of the device cannot be influenced.

Description

technical field [0001] The invention relates to the field of solar water heaters, and relates to the split solar energy of a U-shaped tube heat collector and an enamel outer interlayer heat exchanger. Background technique [0002] At present, most of the water tanks of split solar water heaters adopt a pressure-bearing structure, and the heat exchange structure is divided into built-in heat exchange and external heat exchange. Most of the built-in heat exchangers are welded structures. Although the thermal efficiency is improved, the welds are easy to corrode due to high pressure and high heat, causing the medium to leak out and pollute the water tank; the external heat exchanger has a large heat transfer area, and the heat exchanger does not bear external pressure. , but the interlayer is difficult to enamel, making it difficult to guarantee the anti-corrosion performance, and eventually the heat exchanger is damaged, resulting in the scrapping of the entire water tank. At...

AI Technical Summary

Problems solved by technology

The heat collection efficiency of the vacuum heat pipe collector is high, but the vacuum degree gradually decreases with the increase of the service life, so that the heat collection efficiency is insufficient. The heat loss of the flat plate collector is large and it is not suitable for cold regions, and the overall thermal efficiency is not high.

Although the U-shaped copper tube has a high thermal conductivity, it is easy to open the weld when the copper tube is welded, and the copper is easy to oxidize, and it is easy to block the circulation pipe. The tensile strength of the copper is low, and it is prone to problems such as fatigue cracks and medium leakage.

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