40_Lessons_on_Refrigeration_and_Air_Conditioning_www.hvac-eng.ir_168

40_Lessons_on_Refrigeration_and_Air_Conditioning_www.hvac-eng.ir_168

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8. An ammonia based refrigeration system with a refrigeration capacity of 100TR (1TR=3.5167 kW) operates at an evaporating temperature of –36 o C (saturation pressure = 0.8845 bar) and a condensing temperature of 30 o C (saturation pressure = 11.67 bar). Assume the system to operate on a single stage saturated (SSS) cycle. The compression process may be assumed to be isentropic. Under these conditions, the following property data are available: Enthalpy of saturated vapour at the exit of evaporator, h = 1414 kJ/kg 1 Enthalpy of saturated liquid at the exit of condenser,h = 341.8 kJ/kg 4 Isentropic index of compression, γ = 1.304 The compressor is an 8-cylinder, reciprocating type with a clearance ratio of 0.05 and speed of 1750 RPM. The stroke-to-bore ratio is 0.8. In the absence of superheat data, the refrigerant vapour may be assumed to behave as a perfect gas. The molecular weight of ammonia is 17.03 kg/kmol. Fnd: a) Power input to the compressor b) COP and cycle (second law) efficiency c) Compressor discharge temperature, and d)
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