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

Byju's Answer

Standard XII

Physics

Zeroth Law of Thermodynamics

A refrigerati...

Question

A refrigeration compressor, designed to operate with R 22 (can/cannot) be operated with R 12 because the condensing pressure of R 22 at any given temperature is ... (higher/lower) than that of R 12.

Open in App

Solution

Canot, higher

POINTS TO REMEMBER

Refrigerant, R-11 is generally used in large capacity central a.c. plants having centrifugal compressor.

Refrigerant, R-12 is generally used in small units, especially domestic refrigerators, water coolers etc, having reciprocating compressor.

Suggest Corrections

Similar questions

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

R - 12

refrigerant reciprocating compressor operates between the condensing temperature of

30^{\circ} C

and evaporator temperature of

- 20^{\circ} C

. The clearance volume ratio of the compressor is

0.03

. Specific heat ratio of the vapour is

1.15

and the specific volume at the suction is

0.1089 m^{3} / k g

. Other properties at various states are given in the figure. To realize

2

tons of refrigeration , the actual volume displacement rate considering the effect of clearance is

Q. A standard vapour compression refrigeration cycle operating with a condensing tenperature of

35^{\circ} C

and an evaporating temperature of

- 10^{\circ} C

develops

15 k W

of cooling). The P-h diagram shows the enthalpies at various states. If the isentropic efficiency of the compressor is

0.75

, the magnitude of compressor power (in kW) is (correct to two decimal places)

Q. Nuclear power reactors that supply energy have to operate at low temperature and consequently with a lower efficiency because:

Question 13
At a given temperature, osmotic pressure of a concentrated solution of asubstance.......... .
(a) is higher than that of a dilute solution
(b) is lower than that of a dilute solution
(c) is same as that of a dilute solution
(d) cannot be compared with osmotic pressure of dilute solution.

Join BYJU'S Learning Program

A refrigeration compressor, designed to operate with R 22 (can/cannot) be operated with R 12 because the condensing pressure of R 22 at any given temperature is ... (higher/lower) than that of R 12.

Canot, higher POINTS TO REMEMBER Refrigerant, R-11 is generally used in large capacity central a.c. plants having centrifugal compressor. Refrigerant, R-12 is generally used in small units, especially domestic refrigerators, water coolers etc, having reciprocating compressor.

Canot, higher

POINTS TO REMEMBER

Refrigerant, R-11 is generally used in large capacity central a.c. plants having centrifugal compressor.

Refrigerant, R-12 is generally used in small units, especially domestic refrigerators, water coolers etc, having reciprocating compressor.