As energy costs and regulatory demands for system efficiency increase, thermostatic expansion valves (TXVs) are replacing capillary tubes, particularly in residential air conditioning and heat pumps.
In the late 1910s and early 1920s a pair of scientists independently developed an equation that describes how a fluid rises in a capillary tube as a function of time. The formula—the Lucas-Washburn ...
The capillary tube — the simplest of refrigerant controls — is the most popular method for metering refrigerant flow from the condenser to the evaporator in compression-type refrigeration systems.
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