HVAC · Systems-and-Components · Problem 29PDFSolution in PDF ↓
HVAC · Systems-and-Components · Problem 29
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OH 71: HVAC: Systems And Components-29
Q: For refrigerant line sizing with an equivalent length of 100 ft, what are the inputs to the equation when accommodating a change — for example, using the 7.92-ton capacity value and the associated ΔT?
A: The refrigerant line sizing tables give capacity as a function of equivalent pipe length and allowable temperature equivalent pressure drop — so you need both the tonnage and the ΔT that corresponds to your allowable pressure drop. When equivalent length isn't exactly 100 ft, you scale by the ratio of actual to 100-ft length. Make sure you're reading the table for the correct refrigerant and line type (suction vs. discharge).