EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
9th Edition
ISBN: 9781119321453
Author: Sonntag
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 5, Problem 5.45P
To determine
The smallest power needed for the given conditions.
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Chapter 5 Solutions
EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 2.Two Carnot heat engines run in series with the efficiency of first engine is k times the second. If the thermal reservoir at low and high temperatures were denoted by TL and TH, find the simplified ratio of heat absorbed to heat rejected by the first heat engine in terms of TL, TH and k only.arrow_forwardThermodynamics questionarrow_forwardA heat pump with a motor of 2 kW is used to keep a chicken hatchery at 30°C. This latter loses energy at a rate of 0.5 kW per degree difference to the colder ambient. The heat pump has a COP that is 50% of a Carnot heat pump. a- Draw a sketch for the entire system showing all energy transfers. b- Illustrate a heat pump operating between two constant-temperature energy reservoirs showing all energy transfers. c- What is the minimum ambient temperature for which the heat pump is sufficient?arrow_forward
- 3.3 Would it be possible to use a normal domestic refrigerator as a heat source for a small hot tub or whirlpool? If so, what would you estimate to be the maximum heating rate and temperature that a 300 gal whirlpool could reach using a refrigerator that is sized to use a 1 hp electric compressor designed with an evaporator temperature of 10 ° F and condensing temperature of 125 ° F?arrow_forwardA heat engine has a solar collector receiving 600 Btu/h per square foot, insidewhich a transfer medium is heated to 800 R. The collected energy powers aheat engine that rejects heat at 100 F. If the heat engine should deliver 8500Btu/h, what is the minimum size (area) of the solar collector?arrow_forwardA refrigerator is connected to a generator powered by a fuel with a calorific value of 35000 kJ/kg and a density of 0.85 g/cm3 . The inside temperature of the refrigerator is 0°C, and the outside temperature is 20°C. a. How much work is required to freeze 500 g of water? ΔfreezingH° = 6.02 kJ mol– 1 ) b. How much internal energy change occurs during the process? c. Since the generator consumes 5 L of fuel per hour, calculate the thermal efficiency of this engine.arrow_forward
- A bio-reactor is kept at 42°C by a heat pump driven by a motor of 2 kW. The reactor loses energy at a rate of 0.5 kW per degree difference to the colder ambient. The heat pump has a COP that is 50% that of a Carnot heat pump. What is the minimum ambient temperature for which the heat pump is sufficient?arrow_forwardII. Problem Solving: 1. A Carnot engine requires 35kJ/kg from the hot source. The engine produces 15 kW of power and temperature of the sinks is 26°C. What is the temperature of the source in °C?arrow_forwardThe figure below shows a Carnot engine driving a Carnot refrigerator. If the heat input is 100 Joules and the hot and cold reservoirs are at 500K and 100K respectively, answer the questions that follow. (A). What is qc1 (in Joules)? Express answer in THREE SIGNIFICANT FIGURES? (B). What is qc2 (in Joules)? Express answer in THREE SIGNIFICANT FIGURES? (C). What is qh2 (in Joules)? Express answer in THREE SIGNIFICANT FIGURES? (D). What is W (in Joules)? Express answer in THREE SIGNIFICANT FIGURES? (E). What is the efficiency of the Carnot engine driving this Carnot refrigerator?arrow_forward
- Problem 2 . (II) An ideal heat pump is used to maintain the inside temperature of a house at Tin = 22°C when the outside temperature is Tout Assume the heat pump does work at a rate of 1700 W. Also assume that the house loses heat via conduction through its walls and other surfaces at a rate given by (650 W/C°) (Tin - Tout). (a) For what outside temperature would the heat pump have to operate at all times in order to maintain the house at an inside temperature of 22°C? (b) If the outside temperature is less than you just calculated, what happens? (c) If the outside temperature is 8°C, what percentage of the time does the heat pump have to operate in order to maintain the house at an inside temperature of 22°C? (TT)arrow_forwardThe 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_forwardDiagram pleasearrow_forward
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