At steady state, a heat pump driven by an electric motor maintains the interior of a building at TH=293 K. The rate of heat transfer, inkJ/h, from the building through its walls and roof is given by 8000(TH-TC), where Tc is the outdoor temperature.Determine the minimum electric power, in kW, required to drive the heat pump for Tc = 276 K.(W cycle) min= ieTextbook and MediaSave for LaterkWAttempts: 0 of 5 used Submit Answer

According to the given data Q=8000(TH-TC) TH=293 K TC=276 K We need to find Work required to drive a…

Answered: At steady state, a heat pump driven by…

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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A 3,500-seat auditorium is to be air-conditioned using window units 10 kW nominal value. Assume that a person at rest will dissipate heat at a rate of approximately 360 kJ/h. There are 200 lamps in the auditorium, each rated at 250 W. The rate of heat transfer to the auditorium through the walls and windows is estimated to be equal to 150,000 kJ/h. If the auditorium air goes to maintain at a constant temperature of 200°C, determine the number of air conditioning units of required window. Answer: 45 units.
A heat pump with a coefficient of performance of 3.5 provides energy at an average rate of 70,000 kJ/h to maintain a building at 20 deg C on a day when the outside temperature is -5 deg C. If electricity costs 8.5 cents per kWh, (a) determine the actual operating cost and the minimum theoretical operating cost, each in $/day. (b) compare the results of part (a) with the cost of electrical-resistance heating.
During a process, a system receives energy by heat transfer of 35 J, loses energy by heat transfer of 5 J, does work of 25 J, and work is done on the system of 15 J. What is the total energy change of the system in J?
6
A piston–cylinder assembly contains 0.1 lb of propane. The propane expands from an initial state where p1 5 60 lbf/in.2and T1 5 30°F to a final state where p2 5 10 lbf/in.2 During the process, the pressure and specific volume are related by py2= constant. Determine the energy transfer by work, in Btu.
During a steady flow process, the pressure of the working substance drops from 180 psia to 30 psia, the speed increases from 210 fps to 1050 fps, the internal energy of the open system decreases 30 Btu/lb, ad the specific volume increases from 2 to 10ft^3/lb.Heat loss is 20 Btu/lb. Determine the horsepower for 12 lb/min mass flow. Ans. 66hp
Thermodynamics: Please show me how to solve the following practice problems in step by step solution (Thank you so much!)
1.6 World energy consumption reached about 500 quadrillion Btus in 2010. Estimate the equivalent energy quantities in: barrels of oil, metric tons (tonnes) of coal, standard cubic feet of natural gas, gallons of reservoir water elevated 1000 m above sea level, kilograms of steam (saturated vapor) at 200°C, kilograms of hot water (saturated liquid) at 200°C, cubic meters of granite at 250°C.
In a refrigeration cycle, the refrigerant gains heat in the evaporator and in thesuction line. In a certain refrigeration system, R-134a gains 67.8 Britishthermal units per pound (Btu/lb) in the evaporator. It then gains 2.5 Btu/lb inthe suction line. Find in Btu/lb the total heat gained by the R-134a.
Thermal efficiency of a power cycle is 0.8. For the cycle, Wnet = 250 kJ. Determine Qout in kJ. Enter the answer without units and without rounding.
Thermodynamics question 3 in need the answer please
Given : STEADY STATE COMPRESSOR INLET PRESSURE: IN LET VOLUMETRIC AIR Ask: is elbf/in² FLOW RATE 5 ft³/s POLY TROPIC GOES THROUGH DIAMETER (INCHES) OF FOR EXIT PRESSURE AND EXIT VELOCITY OF PROCESS Pv¹.5 = constant EXIT PIPE 160 lbf / in 2 145ft/s.

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