Evaporator inlet coil and outlet coil - Evaporator excessive pressure drop refrigerant

Technical information Evaporators Evaporator Circuits

Evaporator Chains

Evaporator refrigerant circuit in the passage that exists between the inlet and outlet of the evaporator. To refrigerant mass flow through the evaporator pressure drop must be created between the inlet and outlet ports. This differential is created and maintained compressor and performs several important functions. In aadition to create a refrigerant to flow through to die coil, differential pressure, regulates the speed of the flow and speed of the couple, together with the saturation pressure and temperature of the heat exchanger. Rate and speed of the refrigerant is directly connected with the magnitude of the pressure difference. Therefore, as the pressure drop in the evaporator increases the consumption and speed die refrigerant flowing through the pipelines will also increase. Above refrigerant rate of increase of the heat transfer rate and ensure adequate oil return to the compressor. Pressure reduction through the coil is called a drop in pressure.

The same pressure drop, which is required to create the flow of refrigerant may also reduce the effectiveness of the system.

When the pressure drop across the coil becomes too high, the relative amount die refrigerant vapor increases. Increase in the volume reduction C.O.P. system. Operating pressure drop through the evaporator circuit a function of the velocity die refrigerant pipe inner diameter, the length of each chain and heat load of each circuit. Internal diameter of the tube affects the speed of the refrigerant, it turbulence and, consequently, its resistance to flow. Die die diameter of the tube is reduced, speed and resistance increase, producing a corresponding increase in differential pressure. Tube length affects die length and resistance to the flow path.

And the length of the pipeline increases the resistance and the corresponding pressure drop also increase. Depending on heat load circuit (load circuit) is a course that conducts heat through the walls of the tubes measured in units of BTU/lir (kJ/lir). Load circuit determines the quantity of refrigerant that must pass through each circuit pipelines to meet die cooling requirements of the application. The load increases, the amount of refrigerant flowing through the circuit also rises, increasing differential pressure. An inverse relationship exists between the pipe length and load circuit for a given diameter of the pipe. Thus, for any diameter of a pipe, the length should be reduced, as the load increases so that the pressure drop does not exceed settlement.

Operating the system with refrigerant speeds diat above, Dian needed to ensure adequate oil return is not a good practice. Excessive speed the creation of excessive pressure drops that reduce compressor output and efficiency. To avoid unnecessary loss in the system, evaporators are designed to work with a minimum full-load pressure drop their input and output connections required to maintain good thermal conductivity and oil return. One strategy used to reduce the pressure drop in the evaporator is a division of one tube in one multiple circuits. Evaporator circuit of one of the refrigerant passage between the inlet and outlet connections of the evaporator. Large capacity of the coil and compact rolls with a few lines of the tube designed widi more than one refrigerant circuit. These chains are transmitted parallel to widi each other, so everyone sees the same pressure differential between the metering device and the compressor. This strategy gives the correct intensity of heat transfer in accordance with the requirements of the application while maintaining an acceptable pressure drop in the evaporator...

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