All-plastic straight pressure-bearing double-cycle solar water heater

Abstract

The invention discloses an all-plastic straight pressure-bearing double-cycle solar water heater, comprising a heat insulation water tank, a full-glass tri-cavity vacuum solar collector tube, a tail box and a bracket. An annular groove on the end cover is connected with the water tank to form an annular hole, and the annular hole is communicated with the holes in the water tank wall and is communicated with a collection pipe. In the invention, one part of the water tank also serves as one part of a water collecting tube, multiple holes in the water tank wall provide a circular channel for heating cycle, and the water tank wall is a heat exchanger, thus saving the raw materials and improving the heat transfer efficiency. In the invention, the heat exchange surface is big enough, thus the heat resistance is small, the heat exchange temperature is low, the heat exchange surface is prevented from scaling, and higher heat transfer efficiency can be maintained forever. The liner in the invention is mainly made from a polymer material and has the advantages of long service life, high reliability, simple production process, capability of large-scale industrialized production and wide market prospect, a great quantity of metal raw materials are saved, and the system manufacturing cost is greatly lowered.

Description

Technical field [0001] The invention relates to a year-round solar water heater in solar heat utilization, in particular to an all-plastic straight-insert pressurized double-circulation solar water heater. Background technique [0002] At present, most of the solar water heaters sold in the domestic market are in-line non-pressurized single-cycle solar water heaters. This product has the advantages of low price and high water temperature of the new machine. Because it is a single cycle, the water in the water tank directly enters the solar vacuum tube. When heating, a large amount of fouling will be caused in the vacuum tube. According to the measurement, the heat gain of the vacuum tube solar water heater can be reduced by more than 50% in three years. To solve this problem, a common method is to install magnesium rods in the water tank. The fouling speed in the vacuum tube has been slowed down, and the occurrence of fouling cannot be fundamentally eliminated; because they ...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the solar water heaters sold in the domestic market are in-line non-pressurized single-cycle solar water heaters. This product has the advantages of low price and high water temperature of the new machine. Because it is a single cycle, the water in the water tank directly enters the solar vacuum tube. When heating, a large amount of fouling will be caused in the vacuum tube. According to the measurement, the heat gain of the vacuum tube solar water heater can be reduced by more than 50% in three years. To solve this problem, a common method is to install magnesium rods in the water tank. The fouling speed in the vacuum tube has been slowed down, and the occurrence of fouling cannot be fundamentally eliminated; because they cannot bear pressure, they need to be filled with water once in use, and the operation is very troublesome. cost, which in turn reduces the reliability of the system

Although the heat pipe vacuum tube is a double-cycle working form, its condensing end needs to be made separately, which consumes a lot of precious metals

Due to the small area of ​​the condensing end and the high working temperature, the condensing end is particularly prone to fouling, which greatly reduces the heat transfer efficiency, and its price is difficult to be accepted by ordinary users.

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