The heat from the condenser side is dissipated to the room air. If this heat is not utilized it simply becomes the waste heat. The rejected heat could be used to operate any other low grade heat required refrigeration system.

1. Submitted By:- Submitted To:-.
DHANANJAY PARMAR Neelesh Soni
(Assistant Professor)
Mechanical Engineering Department
ITM UNIVERSITY GWALIOR
1

2. CONTENTS
1. OBJECTIVE
2. INTRODUCTION
3. HISTORY &BACKGROUND
4. PROBLEM DEFINITION
5. DESCRIPTION OF PROJECT
6. METHODOLOGY
7. PROGRESS
8. CONCLUSION
9. REFERENCES
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3. 1. OBJECTIVE
The heat from the condenser side is dissipated to the room air. If this heat is not utilized
it simply becomes the waste heat.
 The rejected heat could be used to operate any other low grade heat required
refrigeration system.
 It is a suitable way of utilization of such waste heat hence improve the co-efficient
of performance of a vapour compression refrigeration system
 To Use as domestic hot water, wash down water, boiler feed water and even
sterilisation. Further lowering the consumption of LPG and Electricity.
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4. 2. INTRODUCTION
 Refrigeration is a process of moving heat from one location to another in controlled
conditions.
 Refrigeration systems are designed to absorb heat at a low temperature and reject it
at a higher temperature and it play a very important role in industrial, domestic, and
commercial sectors for cooling, heating, and food preserving applications.
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COMPRESSOR
CONDE
NSOR
EXPANSION DEVICE
EVAPO
RATOR
Fig 1: Refrigeration Cycle

5. Operation Principle
Compression refrigeration cycles take advantage of the fact that highly compressed
fluids at a certain temperature tend to get colder when they are allowed to expand. If
the pressure change is high enough, then the compressed gas will be hotter than our
source of cooling (outside air, for instance) and the expanded gas will be cooler than
our desired cold temperature. In this case, fluid is used to cool a low temperature
environment and reject the heat to a high temperature environment
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PROCESS 4-1: Two phase liquid vapor mixture of refrigerant
is evaporated through heat transfer from the refrigerated
space.
PROCESS 1-2: Vapor refrigerant is compressed to a relatively
high temperature and pressure requiring work input.
PROCESS 2-3: Vapor refrigerant condenses to liquid through
heat transfer to the cooler surroundings.
PROCESS 3-4: Liquid refrigerant expands to the evaporator
pressure.
CONDENSOR
EVAPORATOR
COMP-
RESSOR
Q OUT
Q IN
3 2
1
4
Fig 2:Refrigeartion Operation Cycle

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The following are the various parts of a vapour compression
refrigeration systems:
(i) compressor,
(ii) discharge line,
(iii) condenser,
(iv) receiver tank,
(v) liquid line,
(vi) expansion valve,
(vii) evaporator,
(viii) suction line.
Fig 3: Working Model of VCRS
cycle with hot chamber
Fig 4: Filter Drier

7. Refrigerant R134-A
 Refrigerant R134a is a hydrofluorocarbon (HFC) that has zero potential to cause the
depletion of the ozone layer and very little greenhouse effect.
 R134a is the chemical compound tetrafluoro ethane.
 R134a is the non-flammable and non-explosive, has toxicity within limits and good
chemical stability.
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No Properties R-134a
1 Boiling Point -14.9°F or -26.1°C
2
Auto-Ignition
Temperature
1418°F or 770°C
3 Ozone Depletion Level 0
4 Solubility In Water
0.11% by weight at
77°F or 25°C
Excel Table 1: R-134A Properties

8. 3. HISTORY &BACKGROUND
 S. C. Walawade ,B.R. Barve , P. R. Kulkarni , The main objective of his paper was to study
“Waste Heat recovery system for domestic refrigerator”. An attempt has been made to utilize
waste heat from condenser of refrigerator.
 S. N. Vedil, A. Kumar, D. Mahto , This paper studies theoretical approach to recover the waste
heat liberated from vapour compression cycle, which is used to run vapour absorption cycle. The
required heat has been given by solar energy. The work evaluated the performance of combined
cooling cycle.
 S. C. Kaushik, N. L. Panwar, V. Siva Reddy , This papers deals with the waste heat recovery by
introducing Canopus heat exchanger. There is a considerable amount of low-grade heat available
in large-capacity systems. To recover this low-grade heat, a Canopus heat exchanger is introduced
between compressor and condenser components.
 Satish K. Maurya, Saurabh Awasthi , This paper deals with utilization of waste heat and improve
the co-efficient of performance of a vapour compression refrigeration plant
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9. 4. PROBLEM STATEMENT
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Energy saving is one of the key issues not only from the view of energy conservation
but also for the aegis of global environment. In the present world energy spectrum
and energy management plays an important role. Energy conservation is the
technique to be adopted to face the energy crisis under these circumstances. Waste
heat is the heat, which is generated in a process by the way of fuel consumption or
chemical reaction and then “dumped” into the environment even though it could still
be utilized for some useful and economic purposes.
HEAT REJECT TO
ENVIRONMENT
AS WASTE
REFRIGERATOR CONDENSOR
Fig 5: Heat Rejection To Environment as Waste

10. 5. DESCRIPTION OF PROJECT
The following experimental facility has been created.
i. Highly insulated chamber with 5 litre capacity is installed in the compressor outlet.
ii. The high pressure high temperature vapour refrigerant is made to pass through the
copper tube which is coiled inside the chamber.
iii. The copper tube is highly insulated outside the chamber.
iv. The heat of the refrigerant is emitted only inside the chamber and waste heat is
recovered and utilized for useful purpose.
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11. HOT AND COLD CHAMBERS
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Fig 6: Hot Chamber (Blue)
Fig 7: Evaporator Chamber (Yellow)

12. 7/29/2017 ITM UNIVERSITY GWALIOR 12
Table shows List of Equipment's
S.NO. EQUIPMENT TYPE/MATERIAL SPECIFICATION
1
2
3
100 Gram
Chamber Hot chamber
Cold Chamber
Blue
Yellow
3.Evaporator Copper, Air cooled
Plate type
Refrigerant R-134A
160-200L
Model MA922G
1/6 HP , 160 Watt
30 Feet Length
Domestic Type
Reciprocating Type
Hermitically Sealed
Copper, Sealed
Refrigerator
1.compressor
2.Condensor
Excel Table 2: List Of Equipment's

13. 6. METHOLOGY
 The existing refrigeration system has air cooled condenser.
 A compactable chamber is inserted between the compressor discharge and condenser.
 Thermostat arrangement is added to control the heat in chamber so that overheating is
also avoided.
 Heating of food particles is done by placing it in the chamber.
 The food particles and chamber water is heated from the waste heat of refrigeration
system.
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Fig 8: Inside view of Hot Chamber

14. 7. PROGRESS
 It has been established that the above mentioned method of heat recovery, can be
designed and developed for every household refrigerators, with the minimal cost.
 Hence the reuse of waste heat paved way for maximum energy conservation.
So, This work can be enhanced by providing better insulation which in turn minimizes
the heat loss and increases the efficiency of the system
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15. 8. CONCLUSION
“Waste heat recovery system” is an excellent tool to conserve available energy. An
attempt is made to recover the waste heat from 160-200 L refrigerator used for
domestic purpose.
It is perceived that by installing water chamber in between compressor and condenser,
will utilize the maximum heat emitted to atmosphere for heating the food particles
and also for heating the drinking water. By this system the power consumption and
LPG consumption in a house for heating food items and water can be reduced. Thus
the waste energy emitted to atmosphere is utilized for useful purposes and the
demand for power is reduced.
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16. 9. REFERENCES
1. S. Maurya and S. Awasthi, Waste Heat Recovery : An Analytical Study Of Combined Ejector And Vapour
Compression Refrigeration System,2014, ISSN: 2277-9655
2. S. C. Kaushik, N. L.Panwar and V. Siva Reddy, Thermodynamic evaluation of heat recovery through a
Canopus heat exchanger for vapor compression refrigeration (VCR) system, J Therm Anal Calorim
(2012) 110:1493–1499
3. R. Varghese, N. Raju, Rohit M, R.T. Antony and T. Mathew, Heat Recovery System in Domestic
Refrigerator, 2014, ISSN (Online):- 2349-3585
4. C.P.Arora, Refrigeration and Air conditioning, Third Edition
5. M. Yaswanth, Utilization of Heat Energy in R & AC Systems, 2015, ISSN (Online): 2319-7064
6. Roy J. Dossat, Principles of Refrigeration, fourth edition, Prentice Hall
7. S. C. Walawade, B.R. Barve and P. R. Kulkarni, Design and Development of Waste Heat Recovery System
for Domestic Refrigerator, ISSN: 2278-1684
8. S. N. Vedil, A. Kumar, and D. Mahto, Waste heat Utilization of vapour compression cycle, 2014, ISSN
2250-3153
9. P. Elumalai, R. Vijayan, K.K. Ramasamy and M. Premkumar, Experimental Study on Energy Recovery
from Condenser Unit of Small Capacity Domestic Refrigerator ,2015, ISSN 1990-9233
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17. Question and answer session
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