ARE Study Review

A water cooled liquid chiller (photo) performs which function in the refrigeration cycle for HVAC systems? A. thermal expansion valve, reducing pressure from the refrigerant's liquid state B. condenser cooling hot refrigerant with ambient air C. heat exchanger for liquid to cool air or equipment D. removes heat from liquid by vapor-compression or absorption refrigeration Answer D. removes heat from liquid by vapor-compression or absorption refrigeration. Industrial chillers may combine the chiller unit, condenser, pump station and expansion valve into a packaged unit. ARE 4.0 exam prep: BS

How can the required capacity of a refrigeration machine generally be determined? Answer Divide the total heat gain in Btu/hr by 12,000.

Which component of the compressive refrigeration cycle releases latent heat? A. the compressor B. the condenser C. the evaporator Answer B. the condenser. After the compressor compresses a gaseous form of refrigerant into a liquid, it passes through the condenser, releasing latent heat, thereafter flowing into the evaporator where the refrigerant expands, vaporizing back to a gas. ARE 4.0 exam prep: BS