A heat pump with refrigerant R22 is used for space heating between temperature limits of -20°C and 25°C. The heat required is 200 MJ/h. Assume specific heat of vapour at the time of discharge as 0.98 kJ/kg.K. Other relevant properties are given below. The enthalpy (in kJ/kg) of the refrigerant at isentropic compressor discharge is Specific enthalpy Saturation temperature T. (°C) sat -20 25 Pressure P(MN/m²) 0.2448 1.048 h,(kJ/kg) 177.21 230.07 hg(kJ/kg) 397.53 413.02 Specific entropy S,(kJ/kg/K 0.9139 1.1047 S.(kJ/kg.K) 1.7841 1.7183

A heat pump with refrigerant R22 is used for space heating between temperature limits of -20°C and 25°C. The heat required is 200 MJ/h. Assume specific heat of vapour at the time of discharge as 0.98 kJ/kg.K. Other relevant properties are given below. The enthalpy (in kJ/kg) of the refrigerant at isentropic compressor discharge is Specific enthalpy Saturation temperature T. (°C) sat -20 25 Pressure P(MN/m²) 0.2448 1.048 h,(kJ/kg) 177.21 230.07 hg(kJ/kg) 397.53 413.02 Specific entropy S,(kJ/kg/K 0.9139 1.1047 S.(kJ/kg.K) 1.7841 1.7183

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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H.W: - Steam at 7 bar & relative humidity 0.08 throttle to 0.05 bar, determine the steam condition after throttle.
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Exercise-47: It is required maintain an air conditioned hall at DBT=28 °C, and WBT=20 °C, Q = 45.4 kW, Q = 16.5 kW. Outside air at DBT=39°C, and WBT=28 °C is mixed with the return air is ratio of (1/4) by volume and then mixture is passed through a cooling coil with apparatus dew point temperature of 9 °C, determine; the temperature of the air after the cooling coil, volume flow rate of air supplied to the hall, BPF, cooling coil load, plot the processes of the system.