Refrigerant Metering Orifices and Thermostatic Expansion Valves Quiz

• A metering orifice is a fixed orifice metering device that limits the amount of refrigerant that can pass through a fitting.
• It creates a pressure drop between the fitting's inlet and outlet and is installed between the condenser and evaporator.
• The orifice must be correctly sized to produce the proper pressure drop for a given system.
• The refrigerant charge is critical in a system with a metering orifice.
• Manufacturers often supply several metering orifices for air conditioners that may require on-site changes to the suction line length.
• One type of metering orifice commonly used in heat pump applications is a sliding fluted piston with a small hole.
• Heat pumps often use two piston-type metering orifices installed between indoor and outdoor coils.
• Fixed metering devices are less efficient than thermostatic expansion valves under varying load conditions.
• A thermostatic expansion valve (TXV) adjusts the refrigerant flow rate based on a superheat pressure signal from a sensing bulb at the evaporator's outlet.
• The refrigerant flow rate through a thermostatic expansion valve is controlled by the combination of the system's low-side pressure and the pressure signal from the sensing bulb.

Test your knowledge on refrigerant metering devices with this quiz! From fixed orifice meters to thermostatic expansion valves, this quiz covers everything you need to know about these important components in air conditioning and heat pump systems. Learn about the benefits and drawbacks of each type of metering device and discover how to properly size and install them. Impress your colleagues with your expertise on refrigerant metering devices after acing this quiz!