FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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QUESTION 8
A farmer runs a heat pump with a 2 kW motor. It should keep a chicken hatchery at 30°C, which
loses energy at a rate of 10 kW to the colder ambient Tamb. What is the minimum COP that will
be acceptable for the heat pump? (please sketch the schematic diagram)
What would be the maximum COP for a heat pump operating in your house if the
outside temperature is 55 F? Draw a heat flow diagram. How much cheaper will this
be than electrical heating?
Asking second time , Strictly don't use chatgpt.
I need to understand the concept,give detailed solution in Handwritten format.
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- Refrigerators currently being manufactured in the United States are using______as their refrigerant.arrow_forwardSince Lucas is an engineer familiar with thermodynamics. He decided to create his own heat engine at home to avoid paying for electricity. He created a small, makeshift heat engine for trial. The combustion of his fuel. diesel, reaches a temperature of 750°C, while waste heat is disposed to the atmosphere at 50°C. He, then connected a generator and a heat pump to the heat engine to check the amount of power being produced. Assume that the heat pump will be used to warm his room to 25°C, while the outside temperature is at 5°C. Lucas' rooms loses 85,000 kJ/hr of heat. And, 25% of the heat engine's power output goes to the heat pump. How much diesel (in kg) needs to be burned by the heat engine to maintain the temperature in Lucas' room? Assume carnot heat engine and heat pump. If the natural gas has a heating value of 22,000 BTU/lb.arrow_forwarda. What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 55°C and a cold reservoir temperature of -22°C ? b. How much heat transfer occurs into the warm environment if 3.62 x 10' J is put into it?arrow_forward
- A cyclic heat engine operates between a source and sink that are respectively attemperatures of 1000 0C and 50 0C. Draw the diagram, calculate the efficiency of the heatengine and the rate of heat rejection per kW net output of the engine.arrow_forwardProvide complete solution and detailed diagram. A refrigerator is to remove heat from the cooled space at a rate of 300 KJ/min to maintain itstemperature at - 8oC. If the air surrounding the refrigerator is 25oC, determine the minimum powerrequired for this refrigerator? A. 0.263 kw B. 0.473 kw C. 0.623 kw D. 0.984 kwarrow_forwardA 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. %3Darrow_forward
- 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? .arrow_forwardDescribe the function and components of a heat engine?arrow_forwardFind out the COP of a Carnot heat pump operating between 6°C and 37°C.arrow_forward
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