The Superiority of the TXV

The TXV is on the left. The fixed metering device is on the right.

The rolled up capillary tubes of the TXV connect to the cooling coil to measure what's going on and adjust accordingly. When the air crossing the cooling coil is especially hot the TXV feeds more refrigerant thereby increasing cooling capacity. When the air crossing the coil is relatively cool the TXV cuts back on the flow of refrigerant thereby protecting the compressor. The TXV's superiority is obvious. And its wholesale cost is not that significant.

The fixed metering device is a small piece of brass with a precisely drilled hole that has no ability to adjust. As a result a system that uses one is at peak efficiency only when indoor and outdoor temperatures happen to match the conditions the fixed metering device is rated for, which is a minority of the time.

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