With a quarter-turn flick of the wrist, a student sets the frisbee rotating at 570 rpm . what is the magnitude of the torque, as
1 answer:
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(a)
Use “saturated refrigerant-134a pressure tableâ€, to find $ , h , and of refrigerant-134a, at 320kPa (P) .
= 251.93kJ/kg
) =0.93026 kJ/kg-K
=0.063681 m/kg
we solve ,
= 282.62 kj/kg
= 127.25 kJ/kg
We use this formula for finding
= 38.8 kw
(b)
Find the COP of the heat pump () .
() =
= (282.62 -127.25) / (282.62-251.93)
= 5.06
What is evaporator pressures ?
Valves for regulating evaporator pressure
Although the compressor suction pressure may be lower, evaporator pressure regulation (EPR) valves can be employed in the suction line to prevent the evaporator pressure from dropping below a set or controlled value.
An EPR valve is used for the following tasks:
1. Prevent potential damage to a liquid chilling evaporator from the liquid freezing.
2. Prevent frost from accumulating on an air-cooling evaporator when it is near freezing point or when operation cannot be interrupted by a brief failure.
3. Permit the operation of two or more evaporators with the same compressor at various load temperatures.
4. Vary the evaporator pressure in accordance with a fluctuating load that is managed by the load temperature.
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