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User: Ramnath

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Ramnath • 3.3k
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Posts by Ramnath

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Calculate the power required to run the refrigerator in case it produces 1000 kg of ice per hour at $-5^0$C
... ### 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 ...
mumbai university refrigeration and air conditioning written 2.6 years ago by Ramnath • 3.3k
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Answer: A: find: i. Mass of air bled from cooling turbine to be used for regenerative cool
... $$\text{Given}:Q=20 TR;p1=0.8 \text{bar};p2=1.2 bar;p3=p4=p5=4.5 \text{bar} ; \\ p7=p6=p6'=1 \text{bar};T8=373K \\ T1=283K T5=333K T7=298K $$ ![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 2.6 years ago by Ramnath • 3.3k
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find: i. Mass of air bled from cooling turbine to be used for regenerative cooling ii. Power required for maintaining cabin at required condition iii. C.O.P. of system
... ### 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 ...
mumbai university refrigeration and air conditioning written 2.6 years ago by Ramnath • 3.3k
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Answer: A: $''$Intercooling during multistaging compression is effective with $NH_3$ as ref
... - 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 2.6 years ago by Ramnath • 3.3k
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$''$Intercooling during multistaging compression is effective with $NH_3$ as refrigerant than $R_{12}''$. Comment.
... **Mumbai University > Mechanical Engineering > Sem8 > Refrigeration and Air Conditioning** **Marks:** 4M **Year:** May 2013 ...
mumbai university refrigeration and air conditioning written 2.6 years ago by Ramnath • 3.3k
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Answer: A: Draw T-S and P-H diagram of sub-cooled and super heat vapour compression refrige
... 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 2.6 years ago by Ramnath • 3.3k
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Draw T-S and P-H diagram of sub-cooled and super heat vapour compression refrigeration cycle and name the processes.
... **Mumbai University > Mechanical Engineering > Sem8 > Refrigeration and Air Conditioning** **Marks:** 5M **Year:** May 2012 ...
mumbai university refrigeration and air conditioning written 2.6 years ago by Ramnath • 3.3k
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Answer: A: Explain Multistage VCRS.
... - 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 2.6 years ago by Ramnath • 3.3k
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Answer: A: What are the advantages of multistage compression?
... **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 2.6 years ago by Ramnath • 3.3k
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What are the advantages of multistage compression?
... **Mumbai University > Mechanical Engineering > Sem8 > Refrigeration and Air Conditioning** **Marks:** 6M **Year:** May 2012 ...
mumbai university refrigeration and air conditioning written 2.6 years ago by Ramnath • 3.3k

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