Natural circulation gravity force liquid-supply evaporator

Abstract

The invention discloses a natural circulation gravity liquid supply evaporator, aiming to provide an evaporator which can enhance the heat transfer coefficient so as to further improve the performance and efficiency of the entire refrigeration device. The low-pressure liquid refrigerant outlet of a gas-liquid separator is connected with the refrigerant inlet of an evaporator; the refrigerant outlet of the evaporator is connected with the inlet of the gas-liquid separator through a return gas pipe; the gas outlet of the gas-liquid separator is connected with a compressor return gas pipe; a liquid level sensor is arranged at the external side of the gas-liquid separator; the liquid level sensor is connected with a liquid level controller; the control signal outlet end of the liquid level controller is connected with the control end of an electronic expansion valve; one end of the electronic expansion valve is connected with the low-pressure liquid refrigerant inlet of the gas-liquid separator; and the other end of the electronic expansion valve is connected with the tube side outlet of a gas-liquid heat exchanger. As the evaporator increases the flow amount of the liquid refrigerant in the evaporator, the refrigerant with high flow rate can completely contact the inner wall of the refrigerant evaporation pipe so as to make full of the heat exchange surface and achieve higher heat transfer coefficient.

Description

technical field [0001] The present invention relates to an evaporator system, more specifically, relates to a natural circulation gravity liquid-fed evaporator system capable of improving the performance and efficiency of the whole refrigeration device. Background technique [0002] The evaporator is the key equipment in the refrigeration device. Its performance has a great impact on the cost and efficiency of the entire refrigeration device. It is a link that must be paid attention to to improve the overall performance and efficiency. [0003] As an important component of a refrigeration device, the improvement of the performance of the evaporator is particularly important. When the evaporation temperature increases by 1°C, the coefficient of performance of the refrigeration device can increase by about 4%. The enhanced heat transfer of the evaporator is the main means to improve the performance of the evaporator, and the improvement of the heat transfer coefficient of the...

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Problems solved by technology

However, expanding the heat transfer area will increase the consumption of materials, and at the same time, the volume of the evaporator will increase accordingly, taking up a large space; increasing the disturbance will increase the flow resistance of the working medium. For the evaporator, increasing the flow resistance means If there is a larger pressure difference between the inlet and outlet, the pressure and temperature of the refrigerant at the outlet will be lower, and the average evaporation temperature will inevitably decrease. From this point of view, on the refrigerant side of the evaporator, the method of enlarging the area and increasing the disturbance is adopted. Enhanced heat transfer means, for the whole system device, its effect is not very significant

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