CAPACITY MODULATING AN EXPANSION DEVICE OF A HVAC SYSTEM

摘要

Methods, systems and apparatuses are directed to a capacity modulating assembly configured to distribute two-phase refrigerant mixture to an evaporator of a HVAC system, such as a micro-channel heat exchanger (MCHEX) evaporator. The capacity modulating assembly may include a plurality of expansion devices. During capacity modulation, at least one of the plurality of expansion devices can be closed so that a refrigerant flow rate through the remaining expansion devices can be maintained. The capacity modulating assembly can include a refrigerant outflow port, which may help direct refrigerant out of the heat exchanger. The capacity modulating assembly can be connected with the MCHEX. The plurality of expansion devices can be configured to extend inside a header of the MCHEX to help distribute refrigerant to the micro-channel tubes of the MCHEX.

主权项

1. A micro-channel heat exchanger, comprising:
a header; a plurality of micro-channel tubes configured to form fluid communication with the header; and a capacity modulating assembly connected to the header, wherein the capacity modulating assembly includes a plurality of expansion devices, a first flow control device connected to one of the plurality of expansion devices; the first flow control device has an open state and a closed state, the closed state is configured to restrict refrigerant to the one of the plurality of expansion devices, and the open state is configured to allow refrigerant to flow to the one of the plurality of expansion devices.