When assessing heating mode performance, what is the suction pressure range with an outdoor temperature of 33 degrees and indoor dry bulb of 65 degrees?

In assessing the heating mode performance of an air-to-air heat pump, the suction pressure is a critical factor in understanding how effectively the system can draw in refrigerant at the outdoor coil and transfer heat to the indoor space. The given outdoor temperature of 33 degrees Fahrenheit and an indoor dry bulb temperature of 65 degrees provides specific conditions under which the system operates.

At an outdoor temperature of 33 degrees Fahrenheit, the suction pressure typically falls within a certain range that correlates with the refrigerant being used. For common refrigerants such as R410A, the suction pressure in heating mode at this temperature generally aligns with the range provided in B. This pressure range reflects the refrigerant's necessary pressure levels to absorb heat efficiently from the outside environment and move it indoors.

In this case, a suction pressure range of 77 to 83 psig accurately represents the conditions expected at that outdoor temperature and effectively demonstrates the heat pump's capacity to provide heating. Maintaining this pressure range is vital for optimal performance, ensuring the compressor operates correctly and the heat exchange process functions efficiently.

The other ranges provided do not coincide with the typical performance characteristics of heat pumps operating under these conditions. Understanding this relationship between temperature and suction pressure is crucial for anyone working with residential air-to