FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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A heat pump cycle is used to maintain the interior of a building at 25°C. At steady state, the heat pump receives energy by heat transfer from well water at 9°C and discharges energy by heat transfer to the building at a rate of 120,000 kJ/h. Over a period of 14 days, an electric meter records that 1500 kW · h of electricity is provided to the heat pump.Determine:(a) the amount of energy that the heat pump receives over the 14-day period from the well water by heat transfer, in kJ.(b) the heat pump’s coefficient of performance.(c) the coefficient of performance of a reversible heat pump cycle operating between hot and cold reservoirs at 25°C and 9°C.
A heat engine operates between thermal energy stores at 800 ° C and 20 ° C. Half of the power generated by the heat engine drives the Carnot heat pump, which is used to heat a house. While the interior temperature of the house is 22 ° C, the outside temperature is 2 ° C, the heat loss of the house is 62000 kJ / h. In these conditions, calculate the minimum heat that should be given to the heat machine per unit time as kW.
A heat pump is used to maintain the interior of a building at 21 °C. At steady state, the
heat pump receives energy by heat transfer from well water at 9°C and discharges energy
by heat transfer to the building at a rate of 120000 kJ/h. Over a period of 14 days, an
electric meter records that 1490 kW-h of electricity is provided to the heat pump.
Determine:
(a) The amount of energy that the heat pump receives over the 14-day period from the
well water by heat transfer, in kJ
(b) The heat pump's coefficient of performance.
(c) The coefficient of performance of a reversible heat pump cycle operating between
hot and cold reservoirs at 21 °C and 9 °C
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- I need some help in how to solve this problem. Any help will be appreciated. Thanksarrow_forward1. In an analysis, a heat engine based on the Carnot cycle operating between 1000 0C and 300 0C. The heat rejected from this engine to the sink was at a rate of 800 kJ/min. Determine the thermal efficiency (in %) and power output (in kW) of the engin 2.You found out that the power output of your dream car is the same as the sum of each digits of your student number (in kW) with a percentage thermal efficiency the same as the first four digit of your student number divided by 100. The calorific value of the fuel available has a calorific value of 40 000 kJ/kg. Assuming a constant power output from the car, calculate the heat transfer rate (in kW) and the fuel consumption rate (in kg/h)arrow_forwardA 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.arrow_forward
- A heat pump cycle delivers energy by heat transfer to a dwelling at a rate of 40,000 Btu/h. The coefficient of performance of the cycle is 2.8. Evaluating electricity at $0.085 per kW•h, determine the cost of electricity during the heating season when the heat pump operates for 2000 hours.arrow_forwardIn your own words, define efficiency as it applies to a device designed to perform an energy transformation.arrow_forwardA heat pump maintains a dwelling at 68°F. When operating steadily, the power input to the heat pump is 5 hp, and the heat pump receives energy by heat transfer from 55°F well water at a rate of 500 Btu/min. (a) Determine the coefficient of performance. (b) Evaluating electricity at $0.18 per kWh, determine the cost of electricity in a month when the heat pump operates for 300 hours. Part A Determine the coefficient of performance. y = iarrow_forward
- At steady state, a refrigeration cycle operates between hot and cold reservoirs at 300K and 275K respectively. The refrigerator removes 600 kW of heat from the cold reservoir. If the cycle's coefficient of performance is 4, determine the power input required in kW. Compare this with the minimum theoretical power required in kW.arrow_forwardThermodynamicsarrow_forward1. A heat engine is supplied heat at the rate of 1700 kJ/min and gives an output of 9 kW. Determine the thermal efficiency and the rate of heat rejection.arrow_forward
- A fluid enters an apparatus at 480 ft/sec, initially, the pressure of the fluid is 120 psia, the specific volume of 5 ft3/lbm and the internal energy is 383 Btu/lbm. The fluid leaves the apparatus at 25 psia, specific volume of 18 ft3/lbm, an exit velocity of 1200 ft/s and internal energy of 120 Btu/lbm. The heat radiation loss is 10 Btu/lbm. Determine the work steady flow, W. (ANS. 256.62 Btu/lbm)arrow_forwardA closed system loses energy by heat transfer at the rate of 10KJ/s. If the system operates at steady state, calculate power in this process.arrow_forwardA power cycle operates between hot and cold reservoirs at 500 K and 310 K. At steady state the cycle develops a power output of 0.1 MW. Determine the minimum theoretical rate at which energy is rejected by heat transfer to the cold reservoir in MW.arrow_forward
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