a. A group of engineering students designs an electric heater with a power rating of 15 kW. If 10 kg of ice at 200 K is placed in the heater, how many minutes will it take to change ice to steam at 400 K. Assume 100% efficient.
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A: For solution refer below images.
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- 2) The energy consumed by a shower for 30 days is 22kwh. It is known that the resistance of the showerhead is 20 ohms and that its nominal current is 15A. So, what is the time in minutes that the shower was turned on during this period?You have decided now that quarantine is about over to take a trip to Hawaii. You decide to rent a small house that has floor to ceiling windows. It is small so it is one floor. The length and width of the windows are 9m x 14m. There are 4 of them. It is a constant 950F (350C) outside and you really like it 650F(180C) inside. You have an air conditioner that operates at 75 percent Carnot efficiency. The windows are 6cm thick and the rest of the house is well insulated. a) How much electrical energy do you use in a day? b) What is the cooling capacity each day?Book - Advance Energy Systems, 2ed, Khartchenko
- Yeji just came back from dance practice and went straight to her bedroom. It was summer so the temperature in her bedroom was estimated to be around 40°C. She then turned her air conditioner on, closed her door and windows, and it cooled her bedroom to 18°C in 20 minutes. Calculate,a. How much heat was transferred to cool her bedroom to 18°C?b. What is the power consumption of the air conditioner, in kW?The air conditioner has a COP of 2.8. Assume the mass of her entire bedroom to be 750 kg of air, Cv = 0.72 kJ/kg.°C and Cp = 1.0 kJ/kg.°C.*Round off all answers to four decimal places*The heat loss from a chicken coop (chicken house) is K(Tnside - Totside) during the winter, where K is 1.5 kW/K. The chicken coop temperature can vary between 15 °C and 25 °C without harming egg production. A heat pump with a coefficient of performance of 40% of that of a reversible heat pump is used to heat the chicken coop. What are the minimum power requirements if the outside temperature is -5 °C? .Question 2. A household with electric resistance heating plans to switch from resistive heating to a ground source heat pump. Annual heat consumption of the house is 30 000 kWh. Investment cost of the heat pump is 21 000 €. Heat pumps COP is 4.0. How much are the annual savings compared to resistive heating after the change of the heating system (in kWh)? Average price of electricity is assumed to be 12 c/kWh. Round off your answer to one decimal digit and enter it without the unit.
- A gas furnace has an efficiency of 75%. How many BTU will itproduce from 1000 BTU of natural gas.1. An engine from a quarry vehicle used in the Build a Beach program of DEMR has a power requirement of 560 kW. Per hour of its operation, it ejects 234 MJ into its surroundings at 50 °C. If it behaves like a Carnot engine, answer the questions below. A. How much work (MJ) is done by the engine per hour of operation? B. What is the efficiency (%) of the engine?C. What is the temperature (°C) of the hot reservoir? 2. Determine the entropy change (kJ/K) associated to the conversion of 10 kg of ice at -11 °C to steam at 121 °C. 3. Anna and Beth are using another rare metal, the nth metal (c = 0.600 J/g-℃), to build the 5-kg cuirass of their design. Initially, the metal is at 2250 K. It is then submerged to 10 kg of water at 15 °C. If the remaining liquid water after submerging the metal is 8.5 kg, solve for the net entropy change (kJ/K) of the system.A heat pump is used to heat a house. When the outside air temperature is 266K and the inside is maintained at 293K, the heat loss from the house is 195 kW. a. What is the minimum electric power (kW) required to operate the heat pump? b. What is the rate of heat transfer to the heat pump? C. What is the COP for an ideal heat pump operating between these temperatures?
- A refrigerator has a coefficient of performance equal to 7. If the refrigerator absorbs 137.5 J of thermal energy from a cold reservoir in each cycle, find a. the work done in each cycle in Joules, and b. the thermal energy expelled to the hot reservoir in Joules.ii. The COP for a refrigerator is 6. The ratio of its highest temperature to the lowest temperature.the energy transffered by heat from an engine during one cycle is 500J. how much energy must be added to the engine so that it can operate at 30 %