Chapter 5, Problem 5.82P

In a refrigeration system there are 30 gallon per minute of water enters theevaporator at 25 degree C and leaves at 5 degree C. Find the tons of refrigeration is required.A. 45.07 TR B. 50.07 TR C. 55.07 TR D. 60.07 TR

A refrigeration system multi evaporators at different temperatures as shown in figure and operates at 35C. the system uses R22 as refrigerant. Determine the required power to operate the system and the COP.!

2. The actual specific evaporation of a certain boiler is 10. Factor of evaporation is 1.05. If the heating value of fuel is 30,000 kJ/kg, find the boiler efficiency. 3. Two boilers are operating steadily on 91000 kg of coal contained in a bunker. One boiler is producing 1591 kg of steam per hour at 1.2 factor of evaporation and an efficiency of 65% and another boiler produces 1364 kg of steam per hour at 1.15 factor for evaporation and efficiency of 60%. How many hours will coal in the bunker run the boilers if the heating value of coal is 7590 kcal/kg?

Question 35

pls answer the given thanks

I need help with parts A - C

None

For each of the three heat pumps described, state whether it violates the First Law of Thermodynamics, the Second Law of Thermodynamics or neither. All three have a hot reservoir temperature of 400K and a cold reservoir temperature of 300K. a. 100J of work are done to the system. 200J of heat are pulled from the cold reservoir. 300J of heat are dumped into the hot reservoir. b. 50J of work are done to the system. 250J of heat are pulled from the cold reservoir. 300J of heat are dumped into the hot reservoir. c. 100J of work are done to the system. 100J of heat are pulled from the cold reservoir. 300J of heat are dumped into the hot reservoir.

A heat pump is used to heat a house. When the outside air temperature is 266K and the inside is maintained at 293K, the heat loss from the house is 195 kW. a. What is the minimum electric power (kW) required to operate the heat pump? b. What is the rate of heat transfer to the heat pump? C. What is the COP for an ideal heat pump operating between these temperatures?