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Thread: Log p/h diagram
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07-01-2007, 06:45 PM #1
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Log p/h diagram
CAn someone verify this for me please:
When you install the liquid receiver on the roof besides the condensor and the liquid is going straight down to the evaporator - let's say 20 m (65ft) - with a liquid temperature of 30°C and the refrigerant R134a gives me 0.8416 dm³/kg or 0.0008416 m³/kg or a density of 1/0.0008416 = 1188 kg/m³ (74.16 lb/ft³)
This gives me a pressure of 1188 kg/m³x 9.81 N/kg x 20 m = 233127 N/m² or 2.33 bar (33.79 psi) gain in 'mechanical subcooling'
When I draw my upper horizontal condensing line in my Log p/h diagam, going from right to left while condensing and I take 5 K SC, then I draw the line with this mechanical SC straight up starting from the end point of the upper line.
Is this correct?Last edited by Peter_1; 08-01-2007 at 06:47 AM. Reason: changed vertical in horizontal, mistake of me
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