Q9/A refrigeration system multi evaporators at different temperatures as shown in figure and operates at 35°C. the system uses R717 as refrigerant. Determine the required power to operate the system and the COP.

A refrigeration unit utilises ammonia as the refrigerant. The diagram for the circuit isshown in Figure Q3 below, with the following conditions: point (1) is a saturated liquidat –30 oC, points (3), (4) and (7) is a saturated liquid at 10 oC and point (5) is a saturatedvapour at –30 oC. The isentropic efficiency of the compressor and pump is 80% and itis assumed there are negligible heat losses to the surroundings. The liquid ammoniahas a specific volume of 0.0015 m3 kg-1. (a) Discuss which factors must be considered when selecting an appropriate refrigerant?(b) Calculate the coefficient of performance (COP) of the cycle.(c) If the effect of refrigeration is 10 kW, determine the required mass flow rate.

The food storage room requires a cooling system with a capacity of 10 tons of refrigeration that operates at an evaporator temperature of -17.8 ° C and a condenser temperature of 30.1 ° C. The refrigerant used is R-717 and the system operates in saturated conditions. Determine C.O.P , Refrigerant flow rate , Heat loss rate in condenses

I think its Chemisty... If an evaporator outlet temperature on an R-410A system is 50f and the evaporator superheat is 10f, what is the evaporating pressure of the refrigerant in the system?

A refrigeration system with a capacity of 15 tons of refrigeration, operates at 150 kPa in the evaporator, while in the condenser it is 1000 kPa. If R-134a refrigerant is in a saturated state, calculate the theoretical power required to operate the compressor. Compressor Power

3. The system in Problem 2 assumes the AT for heat transfer between the refrigeration system condenser and the environment is zero, and the AT between the refrigeration system evaporator and the cold space is zero. This gives us the best possible performance, but it is unrealistic as you need some reasonable AT to drive the heat transfer. Assume you have a Carnot refrigerator that provides the same 10.55 kW of cooling, but the condenser operates at 35°C and the evaporator is at -15°C. These then, respectively, push heat to the environment at 20°C and pull heat out of the 0°C cold space, as shown in the figure. Assuming the cycle itself (i.e., inside the dashed line) still operates as a Carnot refrigerator, find the electric power needed to generate the 3-tons of cooling capacity, the daily cost for this electricity, and COPR. Environment=20°C QH QH Q₁ Q₁ Cold Space=0°C 35°C W -15°C

A refrigeration system with a capacity of 15 tons of refrigeration, operates at 150 kPa in the evaporator, while in the condenser it is 1450 kPa. If refrigerant R-717 is saturated, calculate the theoretical power required to operate the compressor. Compressor Power =