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A heat pump receives energy from a source at 80°C and
Chapter 5, Problem 77HP(choose chapter or problem)
Problem 77HP
A heat pump receives energy from a source at 80°C and delivers energy to a boiler that operates at 350 kPa. The boiler input is saturated liquid water and the exit is saturated vapor, both at 350 kPa. The heat pump is driven by a 2.5-MW motor and has a COP that is 60% that of a Carnot heat pump. What is the maximum mass flow rate of water the system can deliver?
Questions & Answers
QUESTION:
Problem 77HP
A heat pump receives energy from a source at 80°C and delivers energy to a boiler that operates at 350 kPa. The boiler input is saturated liquid water and the exit is saturated vapor, both at 350 kPa. The heat pump is driven by a 2.5-MW motor and has a COP that is 60% that of a Carnot heat pump. What is the maximum mass flow rate of water the system can deliver?
ANSWER:
Solution 77HP
Step 1 of 3
We have to find the maximum mass flow rate of water the system can deliver.
The mass flow rate of water can be found using the expression.
Where,
= rate of heat input in kW
Enthalpy of saturated liquid
water at a pressure of 350 kPa
in kJ/kg
The value of Enthalpy of saturated liquid water at a pressure of 350 kPa can be found from the Table B.1.2
oC = 412 K
