experimental investigation on food warmer cum freezer

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


Dimension:-13.5x4x5.6

Freezer


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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experimental investigation on food warmer cum freezer

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