Improved lithium bromide air conditioning evaporator

Abstract

The invention relates to an improved lithium bromide air conditioning evaporator. The evaporator comprises a refrigerant nozzle and a heat exchanger, wherein the refrigerant nozzle is arranged above the heat exchanger and is matched with a heat exchange tube of the heat exchanger. The evaporator is characterized in that: the port of the heat exchange tube positioned on the upper part of the heat exchanger is a chilled water inlet, and the port of the heat exchange tube positioned on the lower part of the heat exchanger is a chilled water outlet. By using the structure, the heat exchange tube with the chilled water outlet is positioned on the lower part of the heat exchanger, and the liquid film thickness of a refrigerant outside the heat exchange tube is lower, so that the temperature of chilled water effluent is reduced and the efficiency of the evaporator is improved. Unit experiments prove that the refrigerating capacity when the chilled water flows from top to bottom can be 4 to 7 percent higher than that when the chilled water flows from bottom to top.

Description

technical field [0001] The invention relates to a lithium bromide air conditioner, in particular to an evaporator of the lithium bromide air conditioner. Background technique [0002] In the current prior art, a lithium bromide air conditioner evaporator is composed of a refrigerant nozzle and a heat exchanger; the refrigerant nozzle is arranged above the heat exchanger and cooperates with the heat exchange tube of the heat exchanger; The port of the tube is the cold water outlet, and the port of the heat exchange tube located at the lower part of the heat exchanger is the cold water inlet, that is, the chilled water adopts the way of bottom in and top out, which is consistent with the electric refrigeration air conditioner, but the refrigerant of the electric refrigeration air conditioner is Evaporation in the heat exchange tube requires that the refrigerant vapor at the end of the heat exchange tube must be superheated, otherwise the compressor will be damaged, while the l...

AI Technical Summary

Problems solved by technology

We know that the thickness of the refrigerant liquid film outside the heat exchange tube of the lithium bromide air conditioner evaporator affects the evaporation effect, and the evaporation effect determines the temperature of the chilled water outlet. Obviously, the thickness of the refrigerant liquid film outside the heat exchange tube at the lower part of the lithium bromide air conditioner evaporator is smaller than that at the upper part The thickness of the refrigerant liquid film outside the heat exchange tubes, the chilled water adopts the bottom-in and top-out mode, which is not conducive to lowering the temperature of the chilled water outlet; if we make the evaporator larger, because the capacity of the absorber is fixed, the evaporation The temperature must be a certain value between the inlet water temperature and the outlet water temperature of the frozen water. Such refrigerant water is sprayed from the upper part of the evaporator to the lower part. Not only will the water not be cooled, but it will be heated by the refrigerant water higher than its temperature, reducing the heat exchange efficiency

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