Microchannel heat exchangers adopted for evaporator and heat pump applications
In microchannel evaporators, an internal refrigerant distributor is used in combination with vertical microchannel tube orientation and oversized manifolds. This provides optimum thermal performance over a wide range of operating conditions and design issues, ensures uniform refrigerant distribution in the inlet manifold and equal refrigerant injection across all the multi-port microchannel tubes, and counteracts the effects of outlet manifold pressure drop.
Refrigerant distributor of the microchannel evaporator can be operated in reverse refrigerant flow for heating duty in the heat pumps and by using switching valves that allow the same microchannel evaporator to then be used as a condenser for heating operation.
Features and benefits
The new generation microchannel evaporator significantly differs from other types in many ways, including the following features:
Liquid/gas separation of fluid delivered to the distributor
Weir arrangement to facilitate refrigerant injection into the orifices
Directional control of the refrigerant flow to the inlet manifold and to the multiport microchannel tubes
Secondary openings to create a pressure drop to spread out the refrigerant evenly across the length of the manifold
Ternary openings to inject refrigerant into the tube chambers
Isolation of each microchannel tube as secondary chambers to prevent refrigerant flow between the microchannel tubes
Special surface geometry for capturing and holding refrigerant to feed microchannel tubes
Evaporator design permits refrigerant to flow in both directions for use in reversible heat pumps
Product selection software
MCHE selection software includes condenser, evaporator, heat pump, and water coils making it a complete selection and calculation tool for refrigeration professionals. The software provides selections for microchannel heat exchangers which enables the user to select the best-suited product based on several deciding parameters such as heat exchanger application, cooling capacity, refrigerant, evaporation and condensation temperature, airflow and air temperature and other critical variables in refrigeration systems.
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