Problem StatementA heat engine receives heat at a rate of 15 kW from a reservoir at 400 K. It delivers all of theshaft power it produces to a heat pump that delivers 25 kW of heat transfer to a reservoirat 350 K. The heat pump draws heat from a reservoir at 320 K. What is the temperature ofthe warmest region that the heat engine can reject heat to?Answer TableStageDescription1Max COP for heat pump2Shaft power (kW)3Max thermal efficiency of heat engine4Warmest region temperature (K)Your AnswerCorrectAnswer*Due DateGrade(%)PartWeight Attempt Action/Message TypeNov 7, 2024 11:59 pm0.011/5Submit Stage 1Nov 7, 2024 11:59 pmNov 7, 2024 11:59 pm0.011/50.011/5Nov 7, 2024 11:59 pm0.011/5

Step 1:For heat engine:Rate of heat transfer Q˙he=15kWThe temperature of the source reservoir…

Answered: Problem Statement A heat engine…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.46P

See similar textbooks

Similar questions

I have been working on this problem for a while and keep getting wrong answers with many different meathods how do I solve for Q0 here?
Solve this question carefully, write clearly and circle the final answer for the temperature of the source with the units of ( R)
A heat pump is used to extract heat from the outside atmosphere to heat the inside of a building. On a day when the outside air temperature is Tc°C, the heat pump is operating to a COP of 3.7, maintaining the inside temperature of the building at Th°C. If the building is losing heat at the rate of 53,709 kJ/hour in these conditions, determine how much power (kW) must be supplied to a heat pump? Keep two decimal places
A homeowner is trying to decide whether to heat with a furnace rated at 95% efficiency or by an electrically powered heat pump. She lives in a town where electricity is produced by a coal-fired power plant that claims to operate with 1st law efficiency that is 55% of the Carnot limit. The heat pump's CoP is advertised to be 40% of the Carnot limit. For what range of outside temperatures To would the 2nd law efficiency of the furnace be greater than that of the heat pump? Assume T+ = 400°C, T- = T= 40°C. %3D
A heat pump with a COP of 3.2 is used to heat a perfectly sealed house (no air leaks). The entire mass within the house (air, furniture, etc.) is equivalent to 1200 kg of air. When running, the heat pump consumes electric power at a rate of 5 kW. The temperature of the house was 7°C when the heat pump was turned on. If heat transfer through the envelope of the house (walls, roof, etc.) is negligible, the length of time the heat pump must run to raise the temperature of the entire contents of the house to 22°C is (a) 13.5 min (b) 43.1 min (c) 138 min (d) 18.8 min (e) 808 min
A heat pump supplies heat energy to a house in order to maintain its temperature at 20°C. Over a period of one month, the heat pump operates for 100 hours to transfer energy from outside to inside the house. There are two possible heat reservoirs where the heat pump can operate on.Scenario 1: The heat pump receives heat from the outside air at -5°C.Scenario 2: The heat pump receives heat from a lake having a water temperature of 8°C.Upon comparing the two heat reservoirs, the house would be able to save $17 with the lake rather than the outside air. Assuming that electricity costs $0.12/kW-h.a. What is the maximum COP of the heat pump if the outside air is used?b. What is the maximum COP of the heat pump, if the lake as source is used?c. How much heat is lost by the house?*Round off all answers to four decimal places*
3. A steam power plant has an average monthly net power delivery of 740 MW over the course of a year. This power delivery is accomplished by burning coal in the boiler. The coal has a heating value of 9150 Btu/lbm. The cost of the coal is $14.20/ton. The overall thermal efficiency of the plant is, nth Wnet Qboiler 0.26 = 26% Determine the annual cost of the coal required to deliver the given average monthly power.
Heat Engine you are an engineering consultant who has been tasked with providing power to a remote village. After some initial evaluation it was determined that a simple four-device heat engine with water as the working fluid is the best option to produce electricity at the location. Natural gas and wood are abundantly available as a fuel source and 400 kW of power is needed. Design a heat engine to meet the stated requirements.
A student buys a 5000 Btu window air conditioner for his apartment bedroom. He monitors it for one hour on a hot day and determines that it operates approximately 60 percent of the time (duty cycle = 60 percent) to keep the room at nearly constant temperature. (a) Showing all your work and using unity conversion ratios, calculate the rate of heat transfer into the bedroom through the walls, windows, etc. in units of Btu/h and in units of kW. (b) If the energy efficiency ratio (EER) of the air conditioner is 9.0 and electricity costs 7.5 cents per kilowatt-hr, calculate how much it costs (in cents) for him to run the air conditioner for one hour.
(9) The coefficient of performance of a residential heat pump is 2.85. If the input power to this heat pump is 2.7 kW, Calculate the rate of heat supply to the house, in kJ/h.
QI Two reservoirs 727 °C and 23 °C are used to operate heat engine. 50% from the power output of heat engine is employed to drive a reversed Carnot refrigerator that absorbs heat from the cooled space at -2 °C at a rate of 6.7 Kw and rejects heat to the surrounding at 200 °C. Calculate the rate of heat supplied to the heat engine.
A heat pump has a coefficient of performance equal to 4.25 and requires a power of 1.61 kW to operate. (a) How much energy does the heat pump add to a home in one hour? (b) If the heat pump is reversed so that it acts as an air conditioner in the summer, what would be its coefficient of performance? Need Help? Read It

SEE MORE QUESTIONS

Recommended textbooks for you

Principles of Heat Transfer (Activate Learning wi…

Mechanical Engineering

ISBN:

9781305387102

Author:

Kreith, Frank; Manglik, Raj M.

Publisher:

Cengage Learning