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7/27/2019 Experimental Investigation on Food Warmer Cum Freezer
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A PROJECT SEMINAR ON
EXPERIMENTAL INVESTIGATION ON FOOD
WARMER CUM FREEZER
presented by:
SATISH TAMGADGE VIKAS DUBEY
KETAN PATHODE SAMEER DAS
SUSHANT BAWNE VAIBHAV DHAKATEKUNDAN TURALE MOHIT SATPUTE
(BACHELOR OF ENGINEERING FINAL YEAR, MECHANICAL ENGINEERING)
Guided by
Prof. K.A. Sikdar
Professor & HOD, Department of Mechanical Engineering
SHRI SAI COLLEGE OF ENGINEERING & TECHNOLOGY,
BHADRAWATI
(2012-2013)
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INDEX
Introduction
Components used
Hydrocarbon Refrigerant Construction
Working Principle
Calculation
Result & Conclusion
Future scope
References
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Introduction
The domestic refrigerator essentially consist of two compartment
One is the freezer & other is the normal cooling compartment
In our refrigerator the upper part i.e. freezer is replaced by
a warming compartment
The freezing part is placed in the normal cooling
compartment i.e. below warming compartment
The main advantage of this refrigerator is that
we can use one machine for warming as well as for
cooling food and other products.
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Components used
Compressor
Refrigerant (Propane & Iso-butane Blend)
Condenser Evaporator
Expansion Device
Thermostat
Relay
Digital Temperature indicator
Hot chamber
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Hydrocarbon Refrigerant
Zero ODP and negligible GWP
Good substitutes for CFCs, HCFCs, and HFCs. Compatible with copper
Miscible with mineral oil
Energy saving : up to 20% due to lower
molecular mass and vapour pressure
HCs can reduce/eliminate acids forming
Drawback :
Inflammable
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Construction
Hot Chamber
Material :-GI 26Guage
Dimension:-15x8x9.5
Water Tank
Material :-GI 26Guage
Dimension:-13.5x4x5.6
Freezer
Material :-GI 26Guage
Dimension:-14x6x6
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Construction
CondenserMaterial :- Steel tubes
Dimension :- 6 mm Diameter
Capillary Tube
Material :- Copper tubes
Dimension :- 2 mm
Vacuum Cleaning ofCompressor
Charging of Compressor
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Construction
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Construction Capacity of Refrigerator : 165 lit
Compressor :- Hermetically sealed 1/8 HP Refrigerant used :- Propane & Iso-butane Blend (40-50 gm)
Approximate hot chamber temperature : 50-55 degree Celsius
Approximate freezer temperature : -10 degree Celsius
Approximate cold chamber temperature : 4 degree Celsius
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Working Principle
Fig: Working diagram of Food Warmer
cum Freezer
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Working Principle
As we know when refrigerant leaves or discharge from the compressor, it is
superheated from the capillary tube. A capillary tube is used to carry the refrigerant
to the warming compartment, where it is properly coiled to heat it. The refrigerant flowing through the capillary tube transfer heat to the warming
compartment and the temperature inside the compartment rises. Which is then used
to keep anything warm.
After leaving warming compartment the refrigerant flow through the condenser
where it is then cooled and passed it to the evaporator. This cooled refrigerant is thenused for freezer for the chilling and cooling.
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P-h & T-s Diagram
Fig : PressureEnthalpy diagram Fig : Temperature - Specific entropy
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Calculation
Condenser pressure = 7.5 bar
Evaporating pressure =2.4 bar
Specific heat of liquid at 300c
cpl=2.54 kJ/kgk
cpv=1.7 kJ/kgk
t1=100c=263k
t2=300c=303k
S1=S1+2.3 cpv log (T1/T1
)
Where S1=2.35 kJ/kgk
S1=2.35+2.3x1.7 ln (T1/263)
S2= S2+2.3 cpv log (T2/T2
)
S2=2.36
S2=2.36+2.3x1.7 x ln (323/303)
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Calculation
But S1= S2
T1=281.07k
h1=h1+cpv (T1 T1
)
h1=550+1.7(281.02263)
h1=580.71 kJ/kg
h2= h2+ cpv (T2 T2
)
= 600+1.7(323303)
h2=634 kJ/kg
hf3=hf3cpl (T3T3)
=275-2.54(8)
hf3=254.68 kJ/kg
C.O.P. = (h1hf3)/ (h2h1) = (580.71254.68)/ (634580.71)
C.O.P. =6.11
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Result & Conclusion
The C.O.P. ofEXPERIMENTAL INVESTIGATION ONFOOD WARMER CUM FREEZER using HC (Propane & Iso-Butane) as a
refrigerant is found to be 6.11
The performance of modified domestic refrigerators suited to
operate with hydrocarbon blends was experimentally evaluated under
controlled environment conditions. Head-to-head testing under controlled
conditions.
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Future scope
By implementing two stage compressor we can increase theefficiency of refrigerator.
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References
BOOKS REFERENCES Khurmi S.R., Gupta K.J.
Refrigeration and Air Conditioning, S. CHAND PUBLICATION
At_al (Page No. 316,318,347,358,359,376,398,399)
Prasad Manohar
Refrigeration and Air Conditioning, NEW AGE INTERNATIONAL PUBLICATION(113-172,438-476)
INTERNET REFERENCES http://www.google.co.in/url?sa=t&rct=j&q=godrej%2Busing%2Bhc%2Brefrigerant&source=
web&cd=12&cad=rja&ved=0CCQQFjABOAo&url=http%3A%2F%2Fwww.resourcesaver.com%2Ffile%2Ftoolmanager%2FO105UF861.pdf&ei=WcmAUP2kNoPtrQeE2IC4AQ&usg=AFQjCNH0rJzBaX91YAIYqYn9CaBsPgqoVg
http://www.google.co.in/url?sa=t&rct=j&q=recent%2Bresearch%2Bon%2Bhc%2Bas%2Ba%2Brefrigerant&source=web&cd=4&cad=rja&ved=0CDUQFjAD&url=http%3A%2F%2Fwww.ijest.info%2Fdocs%2FIJEST11-03-05-229.pdf&ei=QsqAUI_kNITRrQfXtIGQCw&usg=AFQjCNGXUQ3NLMAHcWUq04K3NPI
u6MJ5Og
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