Helpp pls .. Which statement is true about the process shown?
2 answers:
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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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Answer:
Explanation:
Given
Initial angular velocity
Initial speed
Coefficient of kinetic friction
As No external torque is applied therefore angular momentum is conserved
For rolling without slipping
acceleration provided by surface
Speed of ball after
using
v=final velocity
u=initial velocity
thus