An ammonia refrigerating system has a load of 250 kW and operates at a condensing pressure of1400 kPa and an evaporating temperature of -20°C. The refrigerant exits at the evaporator with a 5-degree superheat. The vapor enters the compressor suction at 10-degree superheat. The compressedvapor is discharged from the compressor at the condensing pressure and 150°C. The refrigerant exitsthe condenser as saturated liquid.a. State the enthalpies at each point:enthalpyPointkJ/kghkJ/kgkJ/kgh2kJ/kgh3kJ/kgh4

Given that: Condensing pressure = 1400 kPa Evaporating temperature = -20 oC Exit of the evaporator…

Answered: a. State the enthalpies at each point:…

Engineering

Mechanical Engineering

a. State the enthalpies at each point: enthalpy Point kJ/kg kJ/kg h kJ/kg h2 kJ/kg h3 kJ/kg h4

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

An ammonia refrigerating system has a load of 250 kW and operates at a condensing pressure of
1400 kPa and an evaporating temperature of -20°C. The refrigerant exits at the evaporator with a 5-
degree superheat. The vapor enters the compressor suction at 10-degree superheat. The compressed
vapor is discharged from the compressor at the condensing pressure and 150°C. The refrigerant exits
the condenser as saturated liquid.
a. State the enthalpies at each point:
enthalpy
Point
kJ/kg
h
kJ/kg
kJ/kg
h2
kJ/kg
h3
kJ/kg
h4

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