Ijesrt: International Journal of Engineering Sciences & Research Technology
Ijesrt: International Journal of Engineering Sciences & Research Technology
Ijesrt: International Journal of Engineering Sciences & Research Technology
IJESRT
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH
TECHNOLOGY
CALCULATION OF COEFFICIENT OF PERFORMANCE IN VAPOUR
COMPRESSION REFRIGERATION SYSTEM BY USING R600 REFRIGERANT
Umar Farooque*, Mr. Yogesh Parkhi
*
Associate professor Department of Mechanical Engineering School of Research and Technology,
Bhopal
DOI: 10.5281/zenodo.579966
ABSTRACT
This Synopsis deals with experimental investigation by using R600 refrigerant and to calculate the value of COP.
We have all experienced a sensation of heat when passing behind a functioning refrigerator or air conditioner. The
cause of this phenomenon is the air condenser, a heat exchanger made up of tubes with air fins attached to the
back of the device. This is where the cooling fluid condenses by releasing its heat into the ambient air. To limit
the system’s energy consumption, humidification processes were initiated. The principle consists of saturating the
ambient air in contact with the exchanger by projecting fine water droplets. Humidification of the air intensifies
the heat exchange on the air side and reduces the cooling fluid’s condensation temperature. This lowers the
compression rate in the cooling cycle and improves the compressor’s consumption of electrical power
INTRODUCTION
Refrigeration may be defined as the process to achieve and keep an enclosed space at a temperature lower than its
surrounding temperature. This is done by continuous extraction of heat from the enclosed space whereas the
temperature is below than that of the surrounding temperature. Nowadays refrigeration is something that is
indispensable in our daily life. One of the most important applications is the preservation of perishable foods and
keeps the food in fresh condition. There is no doubt that food, is just like air and water are necessities for livings.
People often utilize refrigeration to chill their drinks, making it more scrumptious. In additional, refrigeration also
being used in providing thermal comfort to people by means of air conditioning process. Historically, it is
generally agreed that the first refrigeration machine was introduced in 1755 which was made by Scottish professor
William Cullen. However, he did not use his discovery for any practical purpose. In the following 50 years, an
American inventor, Oliver Evans, designed the first refrigeration machine. An American physician, John Gorrie,
built a refrigerator based on Oliver Evans' design in 1844 to make ice to cool the air for his yellow fever patients.
A German engineer named Carl von Linden patented not a refrigerator but the process of liquefying gas in 1876
that is part of basic refrigeration technology. Generally refrigeration systems can be classified in 3 main cycle
systems which are vapor compression refrigeration system, vapor absorption refrigeration system, and gas cycle
refrigeration system. However the vapor compression refrigeration system is the most widely used in the
refrigeration process. It is adequate for most refrigeration applications. The ordinary vapor compression
refrigeration systems are simple, inexpensive, reliable and practically maintenance free.
OBJECTIVES
The main objective of this report is to improve the configuration of the refrigerator test rig to a simpler
configuration. and the effect of the charge quantity of the refrigerant on the refrigeration system. Finally, obtain
the optimum COPr by using the data collected from the experiment. To be able to do this, the exact locations of
the points of interest at where the data (temperature and pressure) should be collected must be identified correctly.
SCOPES
Literature Study
The literature study is mainly focused on the fundamental of working principle of vapor compression refrigeration
cycle. The working principle of each of the 4 main components, compressor, condenser, expansion device and
evaporator are also in the region of concerned.
LITERATURE REVIEW
THE SECOND LAW OF THERMODYNAMICS
There are 2 classical statements of second law of thermodynamics which are the Kelvin-Planck statement and the
Clausius statement. Both of Kelvin-Planck and Clausius statements are 2 equivalent expressions of the second
law of thermodynamics. For refrigerators or heat pump, Clausius statement is being related to which is expressed
as “It is impossible to construct a device that operates in a cycle and produces no effect other than the transfer of
heat from a lower-temperature body to a higher temperature body” (Cengel, 2008).
There is commonsense that heat does not naturally transfer on its own from a colder medium to a warmer medium.
The Clausius statement simply means that if a cyclic device that transfers heat from a colder medium to a warmer
medium will be impossible to be achieved or construct, unless this cyclic device produce a net effect on other
(Cengel, 2008).
For an example, a cyclic device that transfers heat from a cold medium to a warmer one has long been constructed
which is the domestic refrigerator. A domestic refrigerator is in complete compliance with the Clausius statement
of the second law of thermodynamics. The Clausius statement simply states that a refrigerator cannot operate
unless its compressor is driven by an external power source, such as an electric motor. In this case, the compressor
leaves a trace in the surroundings by consuming some energy in the form of work by the electric motor so that to
transfer heat from the colder body to a warmer one (Cengel, 2008).
REFRIGERANTS
Over the last decade, the choice of refrigerant used in a refrigeration system has been becoming a worldwide issue
as mainly in response to the environmental issues of “holes in the ozone layer” and “global warming or greenhouse
effect”. Previously people had no much discussion on the selection of refrigerant. The refrigerants chosen were
all based on the capability of heat absorption and releasing of the fluids, which depends on the latent heat of
vaporization of the fluids. As the majority of applications could be met by the well known and well tested fluids,
R-11, R- 12, R-22, R-502 and ammonia (R-717). However only ammonia can be considered environmental
friendly today, but still it is not readily suited to commercial or air-conditioning refrigeration applications because
of its toxicity, flammability and attack by copper. The ozone layer beyond the atmosphere provides a filter for
ultraviolet radiation, which is harmful to us. The ozone depletion potential of the refrigerants such as R-11, R-12,
R-114, and R502 is due to the emissions into the atmosphere of chlorofluorocarbons (CFCs). The Montreal
Protocol in 1987 agreed that the production of hydro chlorofluorocarbons (HCFCs) would be phased out by 1995
with a consumption cap, followed by a 35 % reduction in consumption beginning in 2004 and alternative fluids
developed (Trott, 2000). The phaseout of HCFCs is earlier in some European countries, with for example Germany
having a phaseout of R-22 in new equipment starting in 2000, and Sweden banning HCFC use for new equipment
after 1997, and service after 2001 (Murphy, 1998).
Figure 2.1: (a) T s and (b) p h diagrams for the idea vapor compression refrigeration cycle
Source: Cengel and Boles (1998)
The vapor compression refrigeration system is the most common refrigerationsystem that is being used nowadays.
It is widely used for all purpose refrigeration. It iscommonly used for all industrial purposes from a small domestic
refrigerator to big airconditioning plant. The vapor compression refrigeration system is an improved type ofsystem
of air refrigeration system. In this system, a particularly suitable working fluid isused to run the whole system and
we called this working fluid as refrigerant. Therefrigerant used is circulating throughout the system alternately
condensing andevaporating without leaving the system (Khurmi, 2006).
METHODOLOGY
DESCRIPTION OF THE TEST RIG:-
Refrigeration test rig consists of a hermetically sealed compressor, air-cooled condenser, capillary and an
evaporator. The evaporator cools the water in a calorimeter. A heater is provided in the calorimeter, whose output
can be varied by a dimmer stat. Separate pressure gauges are provided to measure Condenser & Evaporator
pressures. Five suitable thermometers are provided to measure temperatures at various locations (refer the
Layout). Two energy meters are provided to measure energy supplied to compressor and heater. Suitable H.P.L.P.
cutout, Voltmeter and ammeter are provided in the unit.
EXPERIMENT
WORK
DATA COLLECTION
DATA ANALYSIS
RESULT
EQUIPMENT
COMPRESSOR
The low pressure and temperature vapour refrigerant from evaporator is drawn into the compressor through
the inlet or suction valve A, where it is compressed to a high pressure and temperature. This high pressure
and temperature vapour refrigerant is discharged into the condenser through the delivery or discharge valve B
CONDENSOR
The condenser or cooler consists of coils of pipe in which the high pressure and temperature vapour
refrigerant is cooled and condensed. The refrigerant, while passing through the condenser, gives up its
latent heat to the surrounding condensing medium which is normally air or water
RECEIVER
The condensed liquid refrigerant from the condenser is stored in a vessel known as receiver from where it
is supplied to the evaporator through the expansion valve or refrigerant control valve.
EXPANSION VALVE
It is also called throttle valve or refrigerant control valve. The function of the expansion valve is to allow
the liquid refrigerant under high pressure and temperature to pass at a controlled rate after reducing its pressure
and temperature. Some of the liquid refrigerant evaporates as it passes through the expansion valve, but the
EVAPORATOR
An evaporator consists of coils of pipe in which the liquid-vapour refrigerant at low pressure and
temperature is evaporated and changed into vapour refrigerant under high pressure and temperature to pass
at a controlled rate after reducing its pressure and temperature. Some of the liquid refrigerant evaporates
as it passes through the expansion valve, but the greater portion is vaporized in the evaporator at the
OBSERVATION TABLE
9 Temp. of water T5 °C
REFERANCES
[1] ANSI / ASHRAE Standard (1986). “Standard Method for Temperature Measurement.” Atlanta:
(ANSI / ASHRAE 41.1-1986 (RA 2001).
[2] ANSI/ASHRAE Standard (1989). “Standard Method for Pressure Measurement.” Atlanta: (ANSI /
ASHRAE 41.1-1986 (RA 2001).
[3] Baustian, J.J., Pate, M.B., Bergles, A.E., 1988. Measuring the concentration of a flowing oil–refrigerant
mixture: instrument test facility and initial results. ASHRAE Transactions, Vol. 94, No. 1, pp167–177.
[4] Bi S., Guo K., Liu Z., 2011. Performance of a domestic refrigerator using TiO2-R600a nanorefrigerant
as working fluid. Energy Conversion and Management, Vol. 52, No. 1, pp. 733-737.
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oil/nano-TiO2 as working fluid. ICR07-B2-346.
[6] Brinkman, H.C., 1952. The viscosity of concentrated suspensions and solution. The Journal of Chemical
Physics, Vol.20, pp. 571– 581.
[7] Hamilton, R.L., Crosser, O.K., 1962. Thermal conductivity of heterogeneous two-component systems.
Industrial and Engineering Chemistry Fundamentals, Vol. 1, No. 3, pp. 187–191.
[8] Jensen, M.K., Jackman, D.L., 1984. Prediction of nucleate pool boiling heat transfer coefficients of
refrigerant–oil mixtures. Journal of Heat Transfer, Vol. 106, pp. 184–190.
[9] Jwo et.al, 2009. Effect of nano lubricant on the performance of Hydrocarbon refrigerant system. J. Vac.
Sci. Techno. B, Vol.27, No. 3, pp. 1473-1477.
[10] Kedzierski, M.A., Kaul, M.P., 1993. Horizontal nucleate flow boiling heat transfer coefficient
measurements and visual observations for R12, R134a, and R134a/ester lubricant mixtures. In:
Proceedings of the 6th International Symposium on Transport Phenomena in Thermal Engineering, Vol.
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[11] Whitman, C. W., Johnson, W. M and Tanczyk, J. A. (2000). “Refrigeration and Air Conditioning
Technology.” 4th edition. Delmar Thomson Learning, USA.
CITE AN ARTICLE
Farooque, U., & Parkhi, Y., Mr. (2017). CALCULATION OF COEFFICIENT OF
PERFORMANCE IN VAPOUR COMPRESSION REFRIGERATION SYSTEM BY USING
R600 REFRIGERANT. INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES &
RESEARCH TECHNOLOGY, 6(5), 331-337. doi:10.5281/zenodo.579966