Chapter 5, Problem 5.12P

true or false A refrigerator (COP = 2.5) is used to maintain a lab temperature at 18° C for that 80 MJ of heat is absorbed. Then its work input would be 8.889 kJ/s.

A Carnot heat pump works between 27° C and 327°C. What will be its COP?

Find out the COP of a Carnot heat pump operating between 6°C and 37°C.

The COP of an ideal refrigerator is N. If the machine is operated as a heat pump between the same temperature limits, its COP will be 1. N-1 2. N 3. N+1 4. 2N

pls answer the given asap

As shown in the figure, an air conditioner operating at steady state maintains a dwelling at 70°F on a day when the outside temperature is 102°F. The rate of heat transfer into the dwelling through the walls and roof is 30,000 Btu/h and the net power input to the air conditioner compressor is 3.4 hp. Inside, 70° F Evaporator ← 30.000 Bu Refrigerant loop W. Compressor Outside Condonsor Que Determine the coefficient of performance of the air conditioner. Determine the power input required, in hp, and the coefficient of performance for a reversible air conditioner providing the same cooling effect while operating between the same cold and hot temperatures.

I need a step by step solution please :)

WHAT IS THE BASIC DIFFERENCE BETWEEN A REFRIGERATION SYSTEM APPLIED IN AN AIR CONDITIONING AND IN THE HOUSEHOLD REFRIGERATOR?

Find the mass of water, in kg, that can be cooled from 24 0C to -80C from a 10 tons refrigeration system for 15 hrs. ANSWER: 4197.930 kg A refrigeration system is used to cool water in the evaporator at 3 kg/s of water from 22 oC to  ice. Find the tons of refrigeration required. ANSWER: 364.48805 TR A two stage cascade refrigeration system uses R-11 as the working substance. The evaporator is at -30 0C and the high pressure condenser is at 300C. The cascade condenser is a direct contact type. The refrigeration load is 24 tons. Given that, h2 = 393 kJ/kg; h6 = 408 kJ/kg. Find the mass flow rate in the low pressure loop. ANSWER: 0.4771 kg/s