This article explores how a restricted metering device will affect system performance and efficiency. The system is a commercial refrigeration system with a thermostatic expansion valve (TXV) as the metering device.
The refrigerant being used is R-134a. Very similar results will occur if an automatic expansion valve (AXV) is being used. However, because different refrigerant system configurations may apply when using capillary tubes as metering devices, different system symptoms may occur. The intent of this article is to explore how a partially restricted TXV will affect system performance and efficiency and what symptoms will occur.