## User: Ramnath

Ramnath3.4k
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#### Posts by Ramnath

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... ### Acarnot refrigerator works between the temperature limits of -5°C and 23°C. Calculate the power required to run the refrigerator in case it produces 1000 kg of ice per hour at -5°C. Surrounding temperature is 23°C. Assume reversible heat transfer , specific heat of ice as 2 kJ/kgK and that of wa ...
written 2.7 years ago by Ramnath3.4k
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... $$\text{Given}:Q=20 TR;p1=0.8 \text{bar};p2=1.2 bar;p3=p4=p5=4.5 \text{bar} ; \\ p7=p6=p6'=1 \text{bar};T8=373K \\ T1=283K T5=333K T7=298K$$ ![enter image description here][1] ![enter image description here][2] For 1-2, \frac{T2}{T1}=\big(\frac{p2}{p1}\big)^{\big(\frac{γ-1}{γ}\big) ...
written 2.7 years ago by Ramnath3.4k
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... ### A regenerative air cooling system is used for an airplane to take 20 TR of refrigeration load. The ambient air at pressure 0.8 bar and temperature 10°C is rammed isentropically till the pressure rises to 1.2 bar. The air bled off the main compressor at 4.5 bar is cooled by the ram air in heat ex ...
written 2.7 years ago by Ramnath3.4k
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... - In case of ammonia, constant entropy lines in the superheated zone are of diverging type. So its temperature rise after single stage compression will be more than R12. Hence if water or flash intercooling is used in multistaging then work required for compression reduces significantly. - But for R ...
written 2.7 years ago by Ramnath3.4k
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... **Mumbai University > Mechanical Engineering > Sem8 > Refrigeration and Air Conditioning** **Marks:** 4M **Year:** May 2013 ...
written 2.7 years ago by Ramnath3.4k
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... Process 1-2: Isentropic compression in compressor Process 2-3: Constant pressure heat rejection in condenser Process 3-4: Throttling process in expansion valve Process 4-1: Constant pressure heat addition in evaporator ![enter image description here][1] [1]: http://i.imgur.com/ShjFgYL.pn ...
written 2.7 years ago by Ramnath3.4k
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... **Mumbai University > Mechanical Engineering > Sem8 > Refrigeration and Air Conditioning** **Marks:** 5M **Year:** May 2012 ...
written 2.7 years ago by Ramnath3.4k
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... - Applications like cold storages, liquefaction of gases, chemical industries etc. demand very low evaporator temperatures and pressures, reaching even up to -150°C in some cases. - Hence difference between condenser and evaporator pressure increases. So when pressure ratio required is more than 8 t ...
written 2.7 years ago by Ramnath3.4k
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... **Advantages of multistage compression are:** 1) Reduced work of compression per kg of refrigerant 2) COP increases 3) Wall thickness of L.P. cylinder is reduced, since it has to withstand lower pressures. This makes compressor lighter and cheaper. 4) Heat removal during condensation is reduced ...
written 2.7 years ago by Ramnath3.4k
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