Where is the metering device's orifice typically located within a refrigeration system?

The orifice of a metering device in a refrigeration system plays a critical role in regulating the flow of refrigerant into the evaporator. This orifice essentially functions as a restriction point, creating a pressure drop that allows the refrigerant to expand and cool as it enters the evaporator for heat absorption.

In a refrigeration cycle, the orifice is typically located at the valve's seat of a thermal expansion valve or an orifice metering device. This placement is strategic as it enables the precise control of the refrigerant flow based on the cooling demand and the system's conditions. By being at this point, the orifice helps maintain the correct pressure and temperature of the refrigerant entering the evaporator, facilitating efficient operation and preventing issues such as flooding or starving of the evaporator.

Positioning the orifice elsewhere, such as at the compressor outlet, evaporator inlet, or condenser outlet, would not fulfill its necessary function within the system. Each of these locations would disrupt the intended flow pattern and pressure management essential for refrigeration efficiency. Thus, the valve's seat is the correct and typical location for the metering device's orifice within a refrigeration system.