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What are the effects of heat transfer in single-effect evaporators

Source:本站 | Date: 2017-02-16 | Hits:
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The effect of the heat transfer of the evaporator is a necessary standard for the effective operation of the evaporator. If the heat transfer effect is not good, the evaporator is not working properly. Single-effect evaporator is the most common type of evaporator, its heat transfer is affected by what factors?

 

The single-effect evaporator is one of the main heat exchange equipment in the refrigeration system for the heat exchange between the refrigerant and the low temperature heat source (cooled system). In the evaporator, the refrigerant liquid vaporizes and absorbs the heat of the cooled medium at a low pressure and low temperature, and becomes a refrigerant at a low temperature and a low pressure in a saturated steam or superheated steam, thereby generating and outputting a cold spot in the refrigeration system. Between the valve and the chiller of the chiller, or between the supply and return tubes connected to the vapor-liquid separation plant and installed in a cold or place where cooling or freezing is required.

 

From the perspective of heat transfer, although the evaporator in many forms, but generally belong to the wall heat exchanger, that is, the refrigerant and the cooling medium in the heat exchange on both sides of the heat exchange. On the refrigerant side, the refrigerant absorbs heat by vaporization. And the other side, the cooling medium is always continuous flow through the heat transfer wall, according to the process requirements released after the sensible heat or hot after being cooled or liquefied or frozen. The refrigerant entering the evaporator after the throttling and at the evaporation pressure Po is often in a liquid or vapor-liquid mixed state. The refrigerant absorbs the heat of the cooled medium through the heat transfer wall, reduces the temperature of the cooled medium, and the refrigerant liquid boils into the dry saturated steam or the superheated steam at a relatively stable low temperature and low pressure, and is discharged by the evaporator Inhalation of the refrigerator.

 

The single-effect evaporator is the main heat exchange device in the refrigeration unit. As with the condenser, the heat transfer of the evaporator is related to the heat exchange area, heat transfer temperature difference and heat transfer coefficient. For the selected evaporator, the heat exchange area is constant, so in addition to properly improve the heat transfer temperature difference, the main is to try to improve the heat transfer coefficient of the evaporator. The improvement of heat transfer coefficient depends on the thermal and physical properties of hot and cold fluid, flow conditions, heat transfer characteristics and the structural properties of the evaporator and other factors.
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