CHAPTER 2
1. An ammonia vapor refrigeration cycle operates at an evaporator temperature of 16 C and a
condensing temperature of 32 C. Determine the coefficient of performance (a) for an ideal
saturation cycle, (b) for wet compression with saturated vapor

CHAPTER 1
1. A reversed Carnot cycle is used for refrigeration and rejects 1,000 kW of heat at 340 K while
receiving heat at 250 K. Determine (a) the COP, (b) the power required, and (c) the refrigerating
effect.
Solution:
Th = 340 K , Tc = 250 K
&
QR = 1

Applications of Derivatives — Related Rates Problems
Steps for Solving Related Rates Problems
A. Read the problem carefully and identify all the quantities that are changing (either
increasing or decreasing).
B. Use appropriate variables to represent the

Parts of Compressor
Piston type Compressor
Cylinder - In small compressors the cylinder is
made by directly boring into the main body of the
compressor, which is usually made up of cast iron.
Piston - The piston performs upwards and
downwards motion ins

COMPRESSOR
What is compressor?
It is a refrigerant gas pump in
which the evaporator supplies
gaseous refrigerant at a low
pressure and increases it to a
greater pressure.
Two Components of a
Compressor
the power source
the compressing mechanism
Types of C

CHAPTER 8
1. Calculate the specific volume of an air-vapor mixture in cubic meters per kilogram of dry air at the
following conditions t = 32 C , W = 0.016 kg kg , pt = 100 kPa .
Solution:
0.622p s
W=
pt ps
0.622ps
0.016 =
100 ps
ps = 2.508 kPa
pa = pt ps

CHAPTER 4
1. In an ammonia refrigeration system, the capacity is 210 kW at a temperature of 20 C. The vapor
from the evaporator is pumped by one compressor to the condensing pressure of 1431 kPa. Later,
the system was revised to a two-stage compression op

CHAPTER 5
1. A two-stage cascade refrigeration system uses ammonia as the working substance. The evaporator is at 35
C and the high-pressure condenser is at 1514.2 kPa. The cascade condenser is a direct contact type. The
refrigeration load is 90 tons. Det

CHAPTER 6
1. An open air refrigeration system carries a load of 35 kW with a suction pressure of 103 kPa and a
discharge pressure of 690 kPa. The temperature leaving the refrigerator is 5 C and that leaving the
cooler is 30 C. The compression is polytropi

CHAPTER 7
1. There are removed 3.06 m3/s of vapor from the water evaporator of a vacuum refrigeration system;
the warm water enters the evaporator at 18 C and chilled water leaves at 10 C; make-up water
enters at 29 C. Determine the refrigerating capacity

CHAPTER 3
1. A Freon 12 refrigeration system, with a 10-TR capacity and a coefficient of performance of 3.23,
operates with a condenser pressure of 984.5 kPa and an evaporator pressure of 150.8 kPa. The
temperature entering and leaving the compressor are

Loan Amortization Schedule
http:/www.vertex42.com/ExcelTemplates/loan-amortization-schedule.html
Loan Information
Loan Amount
Annual Interest Rate
Term of Loan in Years
First Payment Date
Payment Frequency
Compound Period
Payment Type
Rounding
Monthly Pay