CN211372803U - Solar water heater anti-freezing system for gas-liquid direct contact heat exchange - Google Patents

Abstract

The utility model discloses an antifreeze system for a solar water heater with gas-liquid direct contact heat exchange, comprising a solar heat collector, using a high temperature gas to directly contact the water in the solar heat collector for circulating heat exchange to improve the temperature in the solar heat collector. The direct contact heat exchanger of water temperature, the gas storage tank connected to the high temperature gas inlet of the direct contact heat exchanger through a solenoid valve, and the geothermal buried pipe connected to the gas storage tank through a gas booster pump. The utility model utilizes the gas filled into the geothermal buried pipe to absorb the geothermal energy in the soil, heats the low-temperature water in the solar collector in the way of gas-liquid direct contact heat exchange, prevents the solar collector from freezing in low temperature weather, and exchanges heat. Fast speed, high efficiency and energy saving.

Description

An antifreeze system for solar water heaters with gas-liquid direct contact heat exchange

technical field

The utility model relates to the field of gas-liquid mixed heat exchange, in particular to a solar water heater antifreeze system with gas-liquid direct contact heat exchange.

Background technique

In recent years, due to the advantages of energy saving, environmental protection, safety and convenience, solar water heaters have been rapidly popularized. However, in some areas, due to the low temperature in winter or rainy and snowy weather, the components of the collector are prone to freezing and the surface is covered by snow, especially the collector tube in the water heater, the water inside is easy to freeze and freeze the collector tube. . For flat-panel solar collectors, antifreeze water heaters are usually used. The antifreeze absorbs solar heat and then conducts indirect heat exchange with water, resulting in reduced heat exchange efficiency. For the emptying and antifreezing measures, manual intervention is required, which not only consumes people's time and energy, but also causes waste of water resources.

Utility model content

The purpose of the utility model is to provide a solar water heater antifreeze system with gas-liquid direct contact heat exchange for the technical defects existing in the prior art. The system uses the high-temperature and high-pressure gas that absorbs geothermal heat and is pressurized to conduct direct contact heat exchange with the low-temperature water in the solar collector. And in the time period when the solar energy is insufficient and the hot water is frequently used, the temperature control system parameters can be adjusted to increase the operation time of the antifreeze system, provide additional heat to the solar collector, and improve the operating efficiency of the entire solar water heater system.

The technical scheme adopted for realizing the purpose of the present utility model is:

An antifreeze system for solar water heaters with gas-liquid direct contact heat exchange, comprising:

Solar heat collector, direct contact heat exchanger that utilizes high temperature gas to directly contact and circulate heat exchange with low temperature water in the solar heat collector to increase the temperature of low temperature water in the solar heat collector, and the direct contact heat exchanger through a solenoid valve A gas storage tank connected to the high temperature gas inlet of the heat exchanger, and a geothermal buried pipe connected to the gas storage tank through a gas booster pump.

Further, the inlet of the geothermal buried pipe is connected with the air outlet of the inflatable device.

Wherein, the circulating water outlet of the solar heat collector is connected to the liquid inlet of the direct contact heat exchanger, and the circulating water inlet of the solar heat collector is connected to the outlet of the direct contact heat exchanger.

The solar water heater antifreeze system with gas-liquid direct contact heat exchange further includes a controller connected with the solenoid valve, and the controller is connected with a temperature sensor for detecting the temperature of the water in the solar collector.

Wherein, the direct contact heat exchanger is a Venturi type high-efficiency mixer.

The antifreeze system of the solar water heater with gas-liquid direct contact heat exchange of the utility model makes full use of the available solar energy and soil energy in the natural environment, and adopts the method of gas-liquid direct contact heat exchange to heat the low-temperature water in the solar heat collector, and the heat exchange efficiency is high. It solves the freezing problem of solar collectors in low temperature weather in winter, improves the operation efficiency of the entire solar water heater, and saves water resources.

Description of drawings

Fig. 1 shows the structure diagram of the solar water heater antifreeze system of the utility model for gas-liquid direct contact heat exchange.

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the solar water heater antifreeze system with gas-liquid direct contact heat exchange of the present invention includes an inflator 1, a geothermal buried pipe 2, a gas booster pump 3, a gas storage tank 4, a solenoid valve 5, a direct contact exchange Heater 6 , solar collector 7 , vent 8 , temperature sensor 9 , controller 10 .

The gas inlet of the direct contact heat exchanger 6 is connected to the outlet of the gas storage box 4 through the solenoid valve 5, the liquid inlet of the direct contact heat exchanger 6 is connected to the circulating water outlet of the solar collector 7, and the direct contact heat exchanger 6 is connected to the outlet of the circulating water of the solar collector 7. The outlet of the heat exchanger 6 is connected to the circulating water inlet of the solar collector 7; the inlet of the geothermal buried pipe 2 is connected to the inflator 1, the outlet of the geothermal buried pipe 2 is connected to the inlet of the gas booster pump 3, and the outlet of the gas booster pump 3 is connected to the storage device 1. Air box 4 inlet connection.

Among them, the cable of the temperature sensor 9 that detects the temperature of the water in the solar collector 7 and the cable of the solenoid valve 5 that controls the flow of the high-temperature gas entering the heat exchanger 6 directly from the gas storage box are connected to a The controller 10 controls the opening and closing of the solenoid valve 5 according to the data of the temperature sensor 9. The controller 10, the solenoid valve 5, and the temperature sensor 9 constitute the temperature control device of the system.

The direct contact heat exchanger 6 is a Venturi-type high-efficiency mixer. After the high-pressure gas flows through the gas inlet, a negative pressure lower than the atmosphere is generated at the liquid inlet, and the pipeline connected to the liquid inlet also has negative pressure. Suction is generated, and the water sucked from the liquid inlet is fully mixed with the gas entering from the gas inlet. During the mixing process, the high-temperature gas and the water sucked from the liquid inlet conduct direct contact heat exchange, and the heat-exchanged medium passes through. The outlet of the direct contact heat exchanger 6 flows back into the solar collector 7 .

When the system is running, the inflator 1 inflates the geothermal buried pipe 2, the gas in the geothermal buried pipe 2 reaches a predetermined pressure, and the inflator 1 stops inflating. The geothermal buried pipe 2 absorbs the heat of the soil to heat the gas in the pipe, and the heated gas is pressurized by the gas booster pump 3 to become high temperature and high pressure gas and enters the gas storage tank 4 for storage. The controller 10 reads the temperature data from the temperature sensor 9 in the solar collector 7, when the read temperature data is less than the preset temperature a of the controller 10 itself, the controller 10 controls the solenoid valve 5 to conduct, at this time The high-temperature and high-pressure gas in the gas storage tank 4 enters the direct contact heat exchanger 6, and the high-pressure gas flow causes the liquid inlet of the direct contact heat exchanger 6 to generate a negative pressure lower than the atmosphere, so that the solar heat collector 7 connected to the liquid inlet is The water at the circulation outlet is drawn into the direct contact heat exchanger 6, and conducts direct contact heat exchange with the high-temperature gas injected from the gas inlet. The medium flow after heat exchange flows out from the outlet of the direct contact heat exchanger 6 and flows into the solar energy collector 7. In this way, until the water temperature of the solar collector 7 reaches the preset temperature b of the controller 10, the solenoid valve 5 is closed and the heating is stopped.

By adjusting the preset temperature in the controller 10 and increasing the opening and closing temperatures a and b of the solenoid valve 5 within a reasonable range, the low-temperature water in the solar collector 7 can be continuously heated, and during periods of insufficient solar energy or frequent use of hot water Additional heat is provided for the solar collector 7 .

The utility model utilizes the geothermal energy in the soil to heat the low-temperature water in the solar heat collector in the way of gas-liquid direct contact heat exchange, with high heat exchange efficiency, and solves the problem that the water in the solar heat collector is easily frozen in low temperature weather. And in the period of frequent use of hot water or insufficient solar energy, additional heat can be provided for the solar collector, which improves the operation efficiency of the entire solar water heater and saves water resources.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present invention. Improvement and modification should also be regarded as the protection scope of the present invention.

Claims (5)

1. The utility model provides a solar water heater system of preventing frostbite of gas-liquid direct contact heat transfer which characterized by includes:

the solar energy heat collector comprises a solar energy heat collector, a direct contact heat exchanger which utilizes direct contact circulating heat exchange of high-temperature gas and low-temperature water in the solar energy heat collector to improve the temperature of the low-temperature water in the solar energy heat collector, a gas storage box which is connected with a high-temperature gas inlet of the direct contact heat exchanger through an electromagnetic valve, and a geothermal buried pipe which is connected with the gas storage box through a gas booster pump.

2. The antifreeze system of solar water heater with direct gas-liquid contact heat exchange of claim 1, wherein the inlet of the geothermal buried pipe is connected with the outlet of the air charging device.

3. The antifreeze system of the solar water heater with the gas-liquid direct contact heat exchange function as claimed in claim 1, wherein the circulating water outlet of the solar heat collector is connected with the liquid inlet of the direct contact heat exchanger, and the circulating water inlet of the solar heat collector is connected with the outlet of the direct contact heat exchanger.

4. The anti-freezing system of the solar water heater with the direct gas-liquid contact heat exchange function as claimed in claim 1, further comprising a controller connected with the electromagnetic valve, wherein the controller is connected with a temperature sensor for detecting the temperature of water in the solar heat collector.

5. The antifreeze system for solar water heater with direct gas-liquid contact heat exchange as claimed in claim 1, wherein said direct contact heat exchanger is a venturi type high efficiency mixer.

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