MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Internal Energy

An ideal refr...

Question

An ideal refrigerator is operating between $37^{\circ} C$ and $- 13^{\circ} C$ . The power required per ton of refrigerator is

A

1.2 kW

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

0.9 kW

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

0.4 kW

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

0.67 kW

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D 0.67 kW

$T_{H} = 273 + 37 = 310 K$

$T_{L} = 273 - 13 = 260 K$

COP $= \frac{R C}{P_{in}} = \frac{T_{L}}{T_{H} - T_{L}}$

$\Rightarrow \frac{3.5}{P_{in}} = \frac{260}{310 - 260}$

$\Rightarrow P_{in} = \frac{3.5 \times 50}{260} = 0.673 kW$

Suggest Corrections

thumbs-up

0

Similar questions

Q. A refrigerator works between

3^{o} C

40^{o} C

. To keep the temperature of the refrigerator constant, 600 cal of heat are to be removed every second. The power required is:

Q. A refrigerator has to transfer an average of

263 J

of heat per second from temperature

- 10^{o} C

+ 27^{o} C

. Assuming no other power losses, the average power consumed by the refrigerator in watt is:

Q. In an refrigerator, compressor motor is of

1 kW

power. Heat is transferred from

- 3^{\circ} C

27^{\circ} C

. What amount of heat is coming out of the refrigerator per second assuming that efficiency of refrigerator is

50 %

of a perfect engine?

Q. An air refrigeration system operating in open air cycle is required to produce 25 ton refrigeration with a cooler pressure of 12 bar and the refrigerator pressure of 1 bar. The temperature of air entering the compressor is at

0^{\circ} C

and entering the expander is

25^{\circ} C

. Assume the isentropic efficiency for compressor to be 90% and polytropic expansion for expander to be n = 1.35. The COP of refrigeration system is (Take

γ

for air = 1.4 and

c_{p}

for air = 1.005 kJ/kgK) .
(Correct upto 3 decimal places)

Q. A single acting

N H_{3}

compressor follows the compression law

(P V^{1.1} = C)

. The operating pressure for the vapour compression refrigeration are: 2.3637 bar

(- 15^{\circ} C

) and 11.671 bar

(+ 30^{\circ} C

). The enthalpy at the exit of compression is 1560 kJ/kg. If refrigerant enters dry saturated to the compressor, then what is the heat loss from the compressor? The refrigeration capacity of the refrigerator is 10 tons..

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

First Law of Thermodynamics

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Internal Energy

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon