Freeze-proof type solar flat plate heat collector

Abstract

The invention provides a freeze-proof type solar flat plate heat collector, relating to the technical field of a flat plate type solar energy heat collector. The heat collector comprises a heat-preserving layer and a heat-collecting board which is arranged in the heat-preserving layer, wherein the heat-collecting board comprises a heat-absorbing piece, an upper heat-collecting pipe, a lower heat-collecting pipe and a plurality of parallel heat-absorbing pipes, the two ends of which are respectively connected with the upper heat-collecting pipe and the lower heat-collecting pipe; the inner diameter of each heat-absorbing pipe is not larger than the inner diameters of the upper heat-collecting pipe and the lower heat-collecting pipe, which are connected with the heat-absorbing pipes; the heat-absorbing pipes are mutually connected with the heat-absorbing piece, one ends of the upper heat-collecting pipe and the lower heat-collecting pipe are larger than the other ends thereof, the middle parts of the upper heat-collecting pipe and the lower heat-collecting pipe are provided with gradually-changed diameters, and the large ends of the upper heat-collecting pipe and the lower heat-collecting pipe are provided with openings which are connected with a water tank; and the direction of the large opening of the upper heat-collecting pipe is opposite to that of the lower heat-collecting pipe. The freeze-proof type solar energy flat plate heat collector has simple and reasonable structure, can effectively overcome the phenomenon that the heat-absorbing pipes, the upper heat-collecting pipe or the lower heat-collecting pipe are cracked caused by the freeze of water therein under the condition of low temperature, can more thoroughly circulate the water, and can be applied to extraordinary-large engineering.

Description

technical field [0001] The invention relates to the technical field of a flat-plate solar heat collector, in particular to a frost-resistant type solar plate heat collector. Background technique [0002] The key problem faced by solar water heaters used in winter so far is that the water in the heat collecting plate freezes and expands when there is no sunlight and the ambient temperature is below 0°C, which freezes the heat absorbing tubes on the heat collecting plate and the upper and lower heat collecting tubes. crack. In order to overcome the above problems, the following three methods are generally used at present: 1. Antifreeze double circulation method: that is, antifreeze that does not freeze below 0°C is placed in the heat collecting plate. The heater heats the water in the tank. This method has high cost and low heat collection efficiency. 2. Evacuation method: When the water in the heat collecting plate reaches below 0°C, the water in the heat collecting plate ...

AI Technical Summary

Problems solved by technology

This method has high cost and low heat collection efficiency

2. Evacuation method: When the water in the heat collecting plate reaches below 0°C, the water in the heat collecting plate is emptied, so as to avoid the problem of freezing of the heat collecting plate. This method requires many electronic control parts, and the cost is high and Unreliable

3. Elastic method: the heat collecting plate is made of elastic material, so as to avoid freezing and damaging the heat collector. This method is expensive and short in life, and cannot be popularized and used

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