What do you think NoL?
Gas / R404A
Evap Temp / -28.9
Condenser Temp / 46.1 C
Step 1: Estimate Condenser THR
From Table 1 for suction cooled compressors, at +25Â° F (-3.9 C) suction and 115Â° F (46.1 C) condensing temperature, select a heat of compressor factor of 1.335.
THR = Compressor Capacity * Heat of Compression Factor
= 1,261 (BTU) * 1.335 (My compressor BTU at 300 Watt load)
Step 2: Correct for Altitude
From Table 3 obtain an altitude correction factor of 1.01 for 500 feet.
THR = THR (from step 1) * Altitude Correction Factor (design)
= 1,683.4 * 1.01 (My altitude factor)
Step 3: Calculate Design Condenser T.D.
Design Condenser T.D. = Condensing Temp â€” Ambient Temp
= 115 - 75 (My ambient)
= 40Â° T.D.
Step 4- Convert the THR
calculated in step 2 to MBH/Â°TD by dividing by 1,000 to get THR in MBH.
Then divide the THR by the design TD to get MBH/Â°TD.
THR (MBH) = 1700.27 / 1,000 = 1.70
THR (MBH/Â°TD) = 1.70 / 40 = 0.0425
Step 5: Calculate Actual T.D. and Condensing Temperature
The actual condenser T.D. can be calculated by dividing the design THR by
the condenser rating.
Actual T.D. = THR (Design) / (Rating @ 1Â° T.D.)
= 1.70 / .0425
= 40Â°F. T.D.
The actual condensing temperature is the actual T.D. plus the ambient
Actual Condensing Temperature = (Actual T.D.) + (Ambient)
= 40 + 75
= 115 Â°F.
= 46.1 C
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