Wall-hung solar water heater

Abstract

The invention relates to a wall-hung solar water heater which comprises a heat collecting plate and a water storing tank, wherein the heat collecting plate is provided with heat collecting pipes; a heat exchanger is arranged in the water storing tank which is arranged above the heat collecting plate; the heat exchanger is communicated with the heat collecting pipes of the heat collecting plate toform a circulation loop; and a heat exchanging medium is stored in the circulation loop. The wall-hung solar water heater is characterized in that the heat exchanging medium is mixture liquid of triethanol amine, propanetriol, sodium dodecyl sulfate and purified water. The invention has simple structure, freezing resistance, safe and convenient installation and use and small occupied area, and has high heat exchanging efficiency because the heat exchanging medium circulates under the action of thermal power.

Description

technical field [0001] The invention relates to a solar water heater, in particular to a wall-mounted solar water heater in which a heat collecting plate and a water tank are separated. Background technique [0002] Solar water heaters are favored by the public for their advantages of safety, energy saving, and no pollution. At present, most of solar water heaters are combined with water tanks and glass heat collecting tubes, and are installed on the top of buildings or other flat places, because of their large footprint. The scope of use of consumers is greatly limited; it is not only inconvenient to install solar water heaters for users on low floors in high floors, but also because the water pipes are too long, each time the cold water in the pipes needs to be emptied to waste water resources; and it uses vacuum glass As a heat collector, the tube is fragile and easy to burst, and has poor antifreeze performance; with the advancement of science and technology, separate wa...

AI Technical Summary

Problems solved by technology

[0002] Solar water heaters are favored by the public for their advantages of safety, energy saving, and no pollution. At present, most of solar water heaters are combined with water tanks and glass heat collecting tubes, and are installed on the top of buildings or other flat places, because of their large footprint. The scope of use of consumers is greatly limited; it is not only inconvenient to install solar water heaters for users on low floors in high floors, but also because the water pipes are too long, each time the cold water in the pipes needs to be emptied to waste water resources; and it uses vacuum glass As a heat collector, the tube is fragile and easy to burst, and has poor antifreeze performance; with the advancement of science and technology, separate water heaters have also appeared on the market, that is, the heat collector plate is separated from the water storage tank and can be installed on the balcony or the outer wall of the building ; Such as Chinese patent 02206240.8 antifreeze type new solar water heater, the heat collecting plate made of its vacuum glass tube collects heat energy to the water collecting tank, and then transfers the heat energy to the heat carrier circulation device through the heat collecting water tank, and the heat energy is transferred to the heat carrier circulation device through the heat carrier circulation device Transfer to the heat exchanger in the hot water storage tank, and a pump for circulating the heat carrier is installed in its heat carrier circulation device; this kind of water heater can be installed on the balcony or the outer wall of the building, but it also has the following defects: First, because the heat collecting tube adopts a vacuum glass tube, it is fragile and easy to burst; second, it gathers light energy into the hot water tank through the heat collecting plate, and then transfers the heat energy to the heat carrier circulation device through the hot water tank, Then it is transferred to the water to be heated through the heat exchanger. After three times of heat energy transfer, the heat energy exchange efficiency is low, and the water temperature is heated slowly; third, the heat carrier circulation device is additionally equipped with a pump, which requires external power to achieve heat exchange. Purpose of media circulation

[0003] Chinese patent 02206009.x discloses a separate water heater using methanol, ethanol, acetone or any combination as the heat exchange medium. The requirement is to change the heat exchange medium from liquid to gas and then use it as a heat carrier for heat transfer; its The defects that exist are: 1. The boiling point of acetone is the lowest, which is 60 degrees Celsius. When the ambient temperature is low and the weather is dark, it is difficult to have enough heat energy to heat the heat exchange medium to its boiling point and turn it into a gas; 2. When the heat exchange When the medium changes completely from liquid to gas in a closed space, according to the principle of gas-liquid saturation, only when the amount of liquid allowed to be placed in the closed space is very small can it be completely changed into gas. Due to the small amount of heat exchange medium, it can The heat energy carried is also very limited. Therefore, this type of water heater has a low heat exchange rate effect, a long heating time, and the effect is not very good.

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