Split pressure bearing type solar water heater

Abstract

The invention discloses a split pressure bearing type solar water heater, comprising a heat collecting header (15), a plurality of heat collecting and guide units arranged in parallel, a pressure bearing water tank (8) and a temperature difference control unit, wherein, a heat exchange pipe coil (82) is arranged inside the pressure bearing water tank (8) which is connected with the heat collecting header (15) by a conduit tube A (6) and a conduit tube B (7) which is provided with a recycle pump (11); the inner wall of the pressure bearing water tank (8) is provided with a temperature sensor B (13) which is used for sensing the water temperature inside the pressure bearing water tank (8), that is the hot water temperature T13, and for outputting the hot water temperature T13 to a temperature difference controller (14); a temperature sensor A (12) is arranged on the outer wall of a heat pipe C (3c) of the third heat collecting and guide unit, the temperature sensor A (12) is used for sensing the temperature inside a vacuum heat collecting pipe in the third heat collecting and guide unit, that is the heat energy temperature T12, and for outputting the heat energy temperature T12 to the temperature difference controller (14) which compares the difference value between the received hot water temperature T13 and the heat energy temperature T12 and obtains the on and off information for driving the recycle pump (11), wherein, delta T is equal to T12 minus T13.

Description

technical field [0001] The invention relates to a solar water heater, more particularly, to a split pressure-bearing solar water heater for heat exchange by means of forced heat exchange of circulating liquid. Background technique [0002] The solar water heater is composed of three major parts: an all-glass vacuum solar heat collecting tube (or vacuum tube, vacuum heat collecting tube), an insulated water tank, and a support frame. The core heat collecting element is an all-glass vacuum heat collecting tube. The outer wall of the inner tube of the heat collector is coated with a multi-layer gradient aluminum-aluminum nitride coating or stainless steel aluminum nitride through magnetron sputtering coating technology. The coating can withstand a high temperature of 400 ° C and selectively absorb sunlight. Ratio ≥ 0.92, emission ratio ≤ 0.09 (80°C). The vacuum heat collection tube selectively absorbs sunlight and converts light energy into heat energy to continuously heat the...

AI Technical Summary

Problems solved by technology

[0005] (1) The amount of water in the vacuum heat collecting tube is too large, and the starting speed is slow

Taking the vacuum heat collecting tube with a diameter of 58mm and a length of 1.5m as an example, the water in the tube accounts for about 1 / 3 of the available water, and the converted sun's heat must first heat the water in the tube, so the startup speed is slow;

[0006] (2) Large heat loss and low available heat

This problem is especially serious in winter in the north, especially when the ice and snow are covered, the water in the tube freezes and causes the vacuum tube to rupture, causing the system to be paralyzed frequently;

[0007] (3) The rupture of a single vacuum tube will cause the entire system to be paralyzed. In special cases, such as balcony wall hanging, the rupture of a single vacuum tube will easily cause dangerous accidents;

[0008] (4) Due to the requirements of the manufacturing process and installation, the tube gap is large, and the light-to-heat conversion rate per unit area is low

[0009] (5) Fouling and precipitation in the vacuum heat collecting tube will seriously affect the heat exchange and even make the vacuum heat collecting tube invalid

[0010] (6) Cannot operate under pressure

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