2.71 WP A heat pump cycle delivers energy by heat transfer to a dwelling at a rate of 11.7 kW. The coefficient of performance of the cycle is 2.8. a. Determine the power input to the cycle, in kW. b. Evaluating electricity at $0.10 per kWh, determine the cost of electricity during the heating season when the heat pump op- erates for 1800 hours.

2.71 WP A heat pump cycle delivers energy by heat transfer to a dwelling at a rate of 11.7 kW. The coefficient of performance of the cycle is 2.8. a. Determine the power input to the cycle, in kW. b. Evaluating electricity at $0.10 per kWh, determine the cost of electricity during the heating season when the heat pump op- erates for 1800 hours.

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

See similar textbooks

Similar questions

2) A heat pump with the amount of heat of liquid refrigerant (mix) when it will enter the expansion of 480 Btu/lb. while the amount of heat from the refrigerant vapor after leaving the evaporator is 412 Btu/lb. What is the coefficient of performance (COP) if the heat amount of the superheated refrigerant after being compressed by the compressor has a value of 572 Btu/lb?
5. A 2000-KW diesel engine unit uses 1 US barrel (bbl) of oil per 525 kW-h produced. Oil is 25°API. Efficiency of generator is 93% and mechanical efficiency is 80%. The thermal efficiency based on indicated power is %.
A heat pump operating at steady state maintains a dwelling at 23°C on a day when the outside temperature is -2°C. Energy is loss by heat transfer from the dwelling at a rate of 22000 J/s while the heat pump's power input is 5kW. a) Determine the coefficient of performance of the heat pump. b) Determine the power input required if it was a Carnot heat pump.
A System executes a power cycle while recieving 750 kJ by heat transfer at a temperature of i500°k and discharging 100 k) by heat transfer at 500°K. Another heat transfer from the system occurs at 1000 °K. Determine the maximum possibe thermal efficiency Of the System using 5 Sigifigant figures.
A domestic refrigerator with a 2.2 copper remove heat from the refrigerated space to A rate of 75 kj/min. Determine a) the electrical power consumed by the KW refrigerator and b) the heat transfer rate in the kitchen; c) Scheme for the problem indicating the values, kj/s.
in a steam power cycle, steam enters the turbine at 20 bar with the following different conditions and leaves at 0.5 bar. calculate Carnot efficincy, Rankine efficincy, consdier heat flow in KW assuming mass flow rate of steam as 12 kg/s and steam rate for each case considering the pump work. i) Dry and saturated ii) wet with 0.95 dryness iii) superheat at 450 degrees C solve the problem by Moiler digram for all the cases
1.3 An arbitrary heat engine is operating with the average heat addition and heat rejection temperatures Tin, and Tout,1 of 600 and 360 K, respectively. The thermal efficiency of the cycle should be increased by 25% (i) by increasing the heat addition temperature or (ii) by decreasing the heat rejec-
Thermal efficiency of a power cycle is 0.8. For the cycle, Wnet = 250 kJ. Determine Qout in kJ.
1. Calculate the kinetic energy of a body that has a mass of 5 kg and velocity of 10 m/s.2. In a non-flow process carried out 5.4 kg substance, there was a specified internal energy decrease of50 kJ/kg and a work transfer of the substance of 8.5 kJ/kg. Determine the heat transfer and a statewhether it is gain or loss.3. A gas is contained in a cylinder with a moveable piston on which a heavy block is placed. Suppose theregion outside the chamber is evacuated and the total mass of the block and the movable piston is102 kg. When 2140 J of heat flows into the gas, the internal energy of the gas increases by 1580 J.what is the distance through which the piston rises?4. Calculate the increase in internal energy of a gas in a closed system during a process in which 100 Jof heat is supplied to the system and 400 J of work is produce.5. Convert the following readings of pressure to kPa, assuming the barometer reads 760 mm Hg. a. 90 cm Hg gaugeb. 40 cm Hg vacuumc. 1.2 m H20 gauge 6. A creature…
Problem # 2: In a steam thermal plant, it operates with a condenser outlet temperature of 180 ° F, and a boiler outlet temperature of 1000 ° F. If the pressure at the pump outlet is 300 psia. If the efficiencies of the turbine and pump are 85%. Determine: a.) The real work of the turbine, in Btu / Ibm. b.) The actual work of the pump, in Btu / Ibm. c.) The thermal efficiency of the real cycle. d.) The thermal efficiencies of the ideal cycle and Carnot. e.) Diagram T vs s, with all possible values and indicating the real and ideal cycles.
2.58 WP The net work of a power cycle operating as in Fig. 2.17a is 10,000 kJ, and the thermal efficiency is 0.4. Determine the heat transfers Qin and Qout, each in kJ.
1. Make a control volume around the whole power plant in Fig. 1.1 and list the flows of mass and energy in or out and any storage of energy. Make sure you know what is inside and what is outside your chosen control volume. FIGURE 1.1 A power tation in Febjeg. Denmark. Courtesy of Dang Enargy AS, Denmarik