CN201170667Y - Natural circulation antifreeze balcony type heat pipe vacuum tube solar water heater - Google Patents

Abstract

The utility model discloses a natural circulation anti-freezing balcony type heat pipe vacuum tube solar water heater, which comprises a hot water storage tank and a heat pipe vacuum tube solar heat collector. The condensing end is inserted into the header pipe; the header pipe is installed vertically, its upper nozzle is connected to the upper circulation port of the hot water storage tank through the upper circulation pipe, and the lower nozzle of the header pipe is connected to the lower circulation pipe through the lower circulation pipe. The lower circulation port of the hot water storage tank is connected, the lower nozzle of the joint header and the lower circulation pipe are not lower than the lower circulation mouth of the hot water storage tank, the upper nozzle of the joint header and the upper circulation The pipe is not higher than the upper circulation port of the hot water storage tank. The solar water heater has the advantages of simple structure, low cost and good antifreeze effect.

Description

Natural circulation antifreeze balcony type heat pipe vacuum tube solar water heater

technical field

The utility model relates to a solar water heater, in particular to a split solar water heater.

Background technique

Solar water heaters are widely used in China due to the use of clean energy - solar energy. In northern my country, due to the low temperature, the water will freeze and damage the water heater, so it is necessary to solve the antifreeze problem.

In order to prevent freezing of solar water heaters installed outdoors, water with antifreeze is usually used as the heat transfer medium. This structure needs to isolate the water with antifreeze from the domestic water in the hot water storage tank. The measures The heat is exchanged through an intermediate heat exchanger, resulting in a relatively complicated structure, high cost, and affecting the heat exchange efficiency.

Utility model content

The purpose of the utility model is to provide a balcony-type solar water heater, which does not need an intermediate heat exchanger and does not add antifreeze, and uses water self-circulation to prevent freezing.

The utility model adopts the following technical scheme: a natural circulation antifreeze balcony type heat pipe vacuum tube solar water heater, including a hot water storage tank and a heat pipe vacuum tube solar heat collector, characterized in that: the heat pipe vacuum tube solar heat collector includes multiple heat pipe vacuum tubes and connected header, the heat pipe condensing end of the heat pipe vacuum tube is inserted into the header; The outlet is connected to the lower circulation port of the hot water storage tank through the lower circulation pipe. The nozzle and the upper circulation pipe are not higher than the upper circulation port of the hot water storage tank.

This solar water heater of the present utility model utilizes the difference in density between the water in the header pipe and the water in the hot water storage tank during the day and night, so that the water passes through the upper circulation pipe and the lower circulation pipe in the joint header pipe and the hot water storage tank. The internal natural circulation achieves the purpose of antifreezing. After testing, the effect of antifreezing can be achieved at -18°C at night in the north. Since no antifreeze and intermediate heat exchanger are used, this solar water heater has a simpler structure and lower cost.

Description of drawings

Fig. 1 is the natural circulation antifreeze balcony type heat pipe vacuum tube solar water heater of the present utility model.

Fig. 2 is a left view of the solar water heater shown in Fig. 1 .

Fig. 3 is another embodiment of the circulation pipe of the natural circulation antifreeze balcony type heat pipe vacuum pipe solar water heater of the present invention.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, to help understand the content of the utility model.

As shown in Figure 2, it is a balcony type heat pipe vacuum tube solar water heater, comprising a hot water storage tank 1 and a heat pipe vacuum tube solar heat collector 2, utilizing the heat pipe vacuum tube solar heat collector 2 to absorb solar energy to heat the water in the heat storage tank 1 It heats up. As a balcony type solar water heater, the hot water storage tank 1 is placed inside the balcony, while the heat pipe vacuum tube solar collector 2 is installed outside the balcony. In the utility model, the heat pipe vacuum tube solar heat collector 2 includes a plurality of parallel heat pipe vacuum tubes 21 as heat absorbing elements to absorb solar energy. The heat pipe vacuum tubes 21 are installed horizontally, and the condensation end of the heat pipe is slightly higher than the evaporation end, and the included angle with the horizontal plane is 0.1 -5°. The heat pipe condensing end of the heat pipe vacuum pipe 21 is inserted in a header pipe 22 . The joint header 22 is placed vertically to make the water flow due to the density difference that exists when the water temperature is different. The heat pipe vacuum tube solar heat collector 2 is installed obliquely to increase the sun-facing area and improve heat absorption. As shown in Figures 1 and 3, the upper nozzle of the header 22 is connected to the upper circulation port 13 of the hot water storage tank through the upper circulation pipe 3, and the lower nozzle of the header 22 is connected to the heat storage tank through the lower circulation pipe 4. The lower circulation mouth 14 of water tank is connected.

In order to enable water to circulate between the hot water storage tank 1 and the header pipe 22 by using the density difference, the lower nozzle of the header pipe 22 and the lower circulation pipe 4 should not be lower than the lower circulation port 14 of the hot water storage tank 1, The upper nozzle of the joint header 22 and the upper circulation pipe 3 are not higher than the upper circulation port 13 of the hot water storage tank 1 . The specific way can be shown in Figure 1, the upper circulation pipe 3 and the lower circulation pipe 4 are installed horizontally. Also as shown in Figure 3, the upper nozzle of the header 22 is lower than the upper circulation port 13 of the hot water storage tank, and the upper circulation pipe 3 is inclined upward from the header 22 toward the hot water storage tank 1; The lower end nozzle of the header pipe 22 is higher than the lower circulation port 14 of the hot water storage tank 1, and the lower circulation pipe 4 is inclined downward toward the hot water storage tank 1 by the header pipe 22. Although the upper circulation pipe 3 and the lower circulation pipe 4 are straight pipes in Figure 1 and Figure 3, they can also be bent pipes, but it must be ensured that the direction of the upper circulation pipe 3 from the header to the hot water storage tank is rising , and the direction of the lower circulation pipe 4 from the header pipe to the hot water storage tank is descended, so as to be consistent with the natural flow direction caused by the density difference of cold and hot water, but the use of curved pipelines will increase the resistance of water flow.

The outside of the header pipe 22, the upper circulation pipe 3, the lower circulation pipe 4 and the hot water storage tank 1 can be provided with an insulating layer to reduce heat loss.

The upper circulation pipe 3 and the lower circulation pipe 4 must pass through the balcony wall, so their length is determined according to the thickness of the balcony wall and the installation position of the hot water storage tank 1. The length of the circulation pipe should be minimized to reduce heat dissipation and reduce water in the circulation pipe. flow resistance.

When there is sun, the heat pipe vacuum tube solar heat collector 1 absorbs solar energy and converts it into heat energy, and the water in the header pipe 22 is added through the heat pipe to make it warm up, and the water temperature in the header pipe 22 is higher than the water temperature in the hot water storage tank 1 , due to the density difference caused by the different temperature of the water, the water in the header pipe 22 enters the hot water storage tank 1 through the upper circulation pipe 3, and the relatively low temperature water in the hot water storage tank 1 enters through the lower circulation pipe 4 The header pipes 22 are connected to form a circulation, and the water in the hot water tank 1 is continuously added through the circulation to increase its temperature, which is called a positive circulation.

When there is no sun, the solar heat collector will continue to dissipate heat when it cannot absorb solar energy, so that the water temperature in the header pipe 22 is lowered so that it is lower than the water temperature in the hot water storage tank 1. Due to the density difference of the water, the water temperature in the header pipe 22 The water inside will enter the hot water storage tank 1 through the lower circulation pipe 4, and the water in the hot water storage tank 1 will enter the header pipe 22 through the upper circulation pipe 3 to form a natural circulation. This circulation can prevent the solar collector from Union header 22 is damaged by freezing, and this circulation is opposite to positive circulation flow direction, is called reverse circulation.

Claims (6)

1. A natural circulation anti-freezing balcony type heat pipe vacuum tube solar water heater, comprising a hot water storage tank and a heat pipe vacuum tube solar heat collector, characterized in that: the heat pipe vacuum tube solar heat collector includes a plurality of heat pipe vacuum tubes and joint headers, the heat pipe vacuum tube The condensing end of the heat pipe is inserted into the joint header; the joint header is installed vertically, and its upper nozzle is connected to the upper circulation port of the hot water storage tank through the upper circulation pipe, and the lower nozzle of the joint header is connected to the upper circulation mouth of the hot water storage tank through the lower circulation pipe. The lower circulation port of the hot water storage tank is connected, the lower nozzle of the joint header and the lower circulation pipe are not lower than the lower circulation port of the hot water storage tank, the upper nozzle of the joint header and the upper The circulation pipe is not higher than the upper circulation port of the hot water storage tank. 2. The natural circulation antifreeze balcony type heat pipe vacuum tube solar water heater as claimed in claim 1, characterized in that: said header pipe, upper circulation pipe, lower circulation pipe and heat storage tank are provided with an insulation layer. 3. The natural circulation antifreeze balcony type heat pipe vacuum tube solar water heater as claimed in claim 1 or 2, characterized in that: the upper circulation pipe and the lower circulation pipe are straight pipes and are installed horizontally. 4. The natural circulation antifreeze balcony type heat pipe vacuum tube solar water heater as claimed in claim 1 or 2, characterized in that: the upper end nozzle of the header is lower than the upper circulation port of the hot water storage tank, and the The upper circulation pipe then rises gradually from the header pipe to the direction of the hot water storage tank. 5. The natural circulation antifreeze balcony type heat pipe vacuum tube solar water heater as claimed in claim 1 or 2, characterized in that: the lower end nozzle of the manifold is higher than the lower circulation port of the hot water storage tank, and the lower The circulation pipe gradually descends from the header pipe to the hot water storage tank. 6. The natural circulation antifreeze balcony type heat pipe vacuum tube solar water heater as claimed in claim 1 or 2, characterized in that: the heat pipe vacuum tube is installed horizontally, the condensation end of the heat pipe is higher than the evaporation end, and the included angle with the horizontal plane is

-5°, the manifold is placed vertically.

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