As shown below, a heat pump provides energy by heat transfer to water vaporizing
ID: 1827363 • Letter: A
Question
As shown below, a heat pump provides energy by heat transfer to water vaporizing from saturated liquid to saturated vapor at a pressure of 2 bar and a mass flow rate of 0.05 kg/s. The heat pump receives energy by heat transfer from a pond at 16 oC. These are the only significant heat transfers. Kinetic and potential energy effects can be ignored. You find a torn data sheet that indicates the power required by the pump is 35 kW. Your colleague claims that there is no way this could be the correct power requirement. What do you say to your colleague (having read chapter 5)?
Below is a schematic of a vapor power plant in which water circulates steadily through the four components as shown. The water flows through the boiler and condenser at constant pressure and through the turbine and pump adiabatically.The boiler and condenser temperatures establish and the high and low temperatures of the cycle.
Kinetic and potential energy effects can be ignored. Process 4->1 occurs at a constant pressure of 1 MPa from saturated liquid to saturated vapor. Process 2->3 occurs at 20 kPa from a quality of 88% to a quality of 18%. Which of the following statements is true:
A reversible and an irreversible refrigeration cycle each discharge the same energy to a hot reservoir at a temperature T_hot and receive the same energy from cold reservoirs at temperatures T_cold and T_cold', respectively. There are no other heat transfers. Which of the following statements must be correct.
0.05 deg. C.Explanation / Answer
.76 C
How do you know? According to my calculations, this could be a suitable power requirement.
The cycle is irreversible and has an efficiency of 18%.
T_cold < T_cold'
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