Vapor compression cycle calculator

Compare refrigeration cases, estimate COP, compressor work, condenser heat, and inspect the cycle on a P-h diagram.Use it to compare evaporating pressure, condensing pressure, superheat, subcooling, COP, compressor power, and condenser heat.P-h calculator P-h diagram guide Superheat & subcooling Saturation pressure vs temperature R134a properties

Refrigerant
Mass Flow
Evaporator Heat Duty
Isentropic Efficiency
Volumetric Efficiency
Mechanical Efficiency
Displacement	cc/rev
Evaporating Pressure
Condensing Pressure
Superheat
Subcooling

Condenser Secondary Side

Enable

Fluid / Flow

Flow Rate

Inlet Temperature

°C

Outlet Temperature

°C

Evaporator Secondary Side

Enable

Fluid / Flow

Flow Rate

Inlet Temperature

°C

Outlet Temperature

°C

P-h Diagram

Calculating cycle results…

COP	Compressor Specific WorkkJ/kg	Compressor PowerkW	Compressor Speedrpm	Evaporator Heat DutykW	Mass Flowkg/h	Condenser Heat DutykW
34.669	4.652	0.144	1263	5.000	94.868	5.123

Item	P_inbar(a)	P_outbar(a)	T_in°C	T_out°C	h_inkJ/kg	h_outkJ/kg	s_inJ/kg·K	s_outJ/kg·K	x_in	x_out
Comp	4.000	25.000	-46.90	-32.40	377.68	382.33	928.07	486.58	—	—
Cond	25.000	25.000	-32.40	-35.40	382.33	187.94	486.58	465.67	—	—
Valve	25.000	4.000	-35.40	-49.90	187.94	187.94	465.67	490.72	—	0.068
Evap	4.000	4.000	-49.90	-46.90	187.94	377.68	490.72	928.07	0.068	—

Assumptions and applicability

Steady four-state cycle estimate: fixed evaporating and condensing pressures, no heat-exchanger pressure drop or heat leak, isenthalpic throttling, and constant input efficiencies. COP uses compressor shaft power and excludes motor and control power.

Secondary-side heat transfer and UA are simplified estimates. Two-phase temperature glide of blends is not included in secondary-side temperature differences. Use results for concept comparison, not detailed equipment sizing or safety checks.

Parameter	Value	Unit
Inlet Pressure	4.000	bar(a)
Outlet Pressure	25.000	bar(a)
Pressure Ratio	6.250	-
Inlet Temperature	-46.90	°C
Outlet Temperature	-32.40	°C
Outlet Superheat	0.00	°C
Inlet Enthalpy	377.68	kJ/kg
Outlet Enthalpy	382.33	kJ/kg
Specific Work	4.652	kJ/kg
Refrigerant-side Compression Power	0.123	kW
Compressor Power	0.144	kW
Speed	1263	rpm
Mass Flow	94.868	kg/h