Four cubic meters of water is to be heated by meansof four 1.5 kW, 230-V immersion heating elements.Assuming the efficiency of the heater as 90%,determine the time required in boiling the water ifthe initial temperature is 20°C and if all fourelements are connected in parallel.A. 71 hrsB. 63 hrsC. 69 hrsD. 66 hrsView Answer:Answer: Option C

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Answered: Four cubic meters of water is to be…

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter17: Commercial And Industrial Air-conditioning Control Systems

Section: Chapter Questions

Problem 6RQ

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Question 13 of 15 Determine: The figure below shows a vapor power cycle that provides process heat and produces power. The steam generator produces vapor at 500 lbf/in.², 800°F, at a rate of 8 x 104 lb/h. Seventy percent of the steam expands through the turbine to 10 lbf/in.² and the remainder is directed to the heat exchanger. Saturated liquid exits the heat exchanger at 500 lbf/in.² and passes through a trap before entering the condenser at 10 lbf/in.² Saturated liquid exits the condenser at 10 lbf/in.² and is pumped to 500 lbf/in.² before entering the steam generator. The turbine and pump have isentropic efficiencies of 85% and 89%, respectively. For the process heat exchanger, assume the temperature at which heat transfer occurs is 465°F. Let To -60°F, po - 14.7 lbf/in.² Steam generator 6 7p=89% P₁ = 500 lbffin,² T₁ = 800°F Heat exchanger Pump m₂ ND 1 (y) (1-y) √n process 7=85% P4=500 lbf/in.2 saturated liquid (a) the magnitude of the process heat production rate, in Btu/h. P3=10…
There are 144 fuel cells are joined in a series through interconnects.there will be 4 stacks having 36 cell in each stack.these stacks are then oragnised in series and parallel combination to form a single module to deliver required voltage and output power.this SOFCs module then combined with CHP system to get thermal . From this data answer the following questions. a)Calculate voltage losses of module?.this question is very compulsory. b)Electrical efficiency of module? C)Thermal efficiency when module combine with CHP system? D)Combined electrical and thermal efficiency? The input parameters of single cell are given below: Ocv=1.020 Current density=2250mA/cm2 Power density=850mw/cm2 Cell active area= 121cm2 Net power=15kw System fuel utilization=80% Operating temp=550°c Cell voltage=0.8v Power of single cell=103 watt.
Number 5 Please show your detailed solution.
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Marked out of 1.50 P Flag question 13. i) The data for a wind turbine is given below: Wind speed = 14 meters/sec, Length of blade = 10 meter. Choose the correct statement for this wind turbine. a. The input wind power to the turbine is 258 KW b. The input wind power to the turbine is 51.7KW c. The input wind power to the turbine is 25.8KW d. The input wind power to the turbine is 517KW 13. ii) Refer to the above wind turbine choose the correct statement a. The wind rotor swept area is 40square meters. b. The wind rotor swept area is 62.4 square meters. c. The wind rotor swept area is 314 square meters. d. The wind rotor swept area is 31.4 square meters. O O O O
Question 2 A Two units each of 200 MW in a thermal power plant are operating all the time throughout the year. The maximum and minimum load on each unit is 200 and 50 MW, respectively. The incremental fuel characteristics for the two units are given as: $ = 0.08P, + 15 dC, (P1) dC2(P2) $ = 0.1P2 + 13 d(P,) MW. hr d(P2) MW. hr Determine the annual saving in fuel cost in $ for the economic distribution of the total load of 100 MW between two units of the plant.
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9. When making a high energy measurement: a. Attach the meter to the energized line first, then to ground. b. Attach the meter to ground first, then to the energized line. c. Attach both meter leads concurrently. d. Remove power completely, attach the meter, then restore power.
one turn of a copper bar is produced by cutting copper washer along a radius and spreading the ends. The washer is cut from soft drawn copper having a resistivity at 20 degrees celsiu of 1.732 micro ohm-cm. The washer is 0.125 inch thich and has inside diameter and outside dianmeter of 1 inch and 9 inches respectively. Calculate the exact resistance between the two end of the turn. Assume the contact along the ends of the turn to be perfect over the entire crown section.
I need the answer as soon as possible
please sir solve these 2 questions, thanks alot

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