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Which of the following statements are true? (multiple answers are possible) A. The thermal efficiency of...
8: Answer to the following: a. Describe essential characteristics of the reversed Carnot refrigerator. b. Write...
8: Answer to the following: a. Describe essential characteristics of the reversed Carnot refrigerator. b. Write down the formulas for the thermal efficiency of reversible heat engine and for the coefficient of performance (COP) of irreversible heat pump explicitly. Discuss the reason why the flow work of a heat pump must be minimized. d. Discuss which process is the best for a heat pump among the isentropic, polytropic, and isothermal processes in terms of the P-v property diagram.
6. Using an engine of 45% thermal efficiency to drive a refrigerator having a COP of...
6. Using an engine of 45% thermal efficiency to drive a refrigerator having a COP of 3, a. Draw the heat engine and heat pump diagram as described with a suitable label What is the heat input into the engine for 5 MJ removed from the cold body by the refrigerator? b. If this system is used as a heat pump, how many MJ of heat would be available for heating for 5 MJ of heat input to the engine?...
Which of the following statements are true for a reversible adiabatic compressor (multiple answers are possible)...
Which of the following statements are true for a reversible adiabatic compressor (multiple answers are possible) O A. Entropy generation is zero B. The compressor is ideal and will consume minimal work OC. The compression process is isentropic OD. Heat may transfer from the compressor to the surroundings
please answer these questions 1. What is the difference between a refrigerator and a heat pump?...
please answer these questions 1. What is the difference between a refrigerator and a heat pump? 2. A heat pump and a refrigerator are operating between the same two thermal reservoirs. Which one has a higher COP? 3. Define the COP of a heat pump. 4. Thermal efficiency of a heat engine is defined to be the ratio of energy output desirable to energy input. Would you think that efficiency is an appropriate definition to be used when a heat...
E A heat pump operates on a reversed Carnot cycle with a COP of 7.7. If...
E A heat pump operates on a reversed Carnot cycle with a COP of 7.7. If it keeps a -pace at 25 C by consuming 9.6 kW of power. a. Determine the temperature of the reservoir from which the heat is absorbed, b. Determine the heating load provided by the heat pump. 6 Draw the energy flow diagram of the heat pump. d. Determine the actual COP if its irreversibility is 17 kW. e Determine the second law efficiency of...
For the two cycles, A and B. shown in the figure, which of the statements are...
For the two cycles, A and B. shown in the figure, which of the statements are true (Mark T) or false (Mark F). Mark all of them TA 5 TH 6 A B T 4 8 The thermal efficiency of B is less than the thermal efficiency of A; b. The cycle A produces more net work than cycle B; c. The cycle A rejects more heat than cycle B; d. The process 5 - 6 is a reversible isobaric...
Answer Description The Carnot cycle attempts to model the most efficient possible process by avoiding what?...
Answer Description The Carnot cycle attempts to model the most efficient possible process by avoiding what? 1. Adiabatic processes 2. Isothermal processes 3. Irreversible processes 4. Reversible processes For the Carnot cycle, in what type of process is heat added or removed? 1. Adiabatic 2. Isobaric 3. Isochoric 4. Isothermal Which statement is true? 1. n carnot < nactual 2. n Carnot = nactual 3. n carnot > nactual D. A heat engine takes from heat from a reservoir at...
4. Which of the following statements regarding the Newsvendor model is TRUE? a) The newsvendor model...
4. Which of the following statements regarding the Newsvendor model is TRUE? a) The newsvendor model works well for regularly stocked items but not for perishable items b) The in stock probability must be less than or equal to the critical ration for any possible order quantity c) A critical ration of .7 means there is a 70% chance that demand is less than or equal to the optimal order quantity d) If the critical ration is greater than 50%,...
Part A A heat engine is designed to do work. This is possible only if certain relationships between the heats and temp...
Part A A heat engine is designed to do work. This is possible only if certain relationships between the heats and temperatures at the input and output hold true. Which of the following sets of statements must apply for the heat engine to do work? A) Qh < Qc and Th < Tc B) Qh > Qc and Th < Tc C) Qh < Qc and Th > Tc D) Qh > Qc and Th > Tc Part B Find...
10.Which one of the following statements is NOT true? Select one: A. The risk that the...
10.Which one of the following statements is NOT true? Select one: A. The risk that the lender may not receive payments as promised is called default risk. B. Investors must pay a premium (a higher price) to purchase a security that exposes them to default risk. C. Australian government securities are assumed not have any default risk and are adopted as the best proxy measure for the risk-free rate. D. The greater the risk of an investment, the greater the...
8: Answer to the following: a. Describe essential characteristics of the reversed Carnot refrigerator. b. Write down the formulas for the thermal efficiency of reversible heat engine and for the coefficient of performance (COP) of irreversible heat pump explicitly. Discuss the reason why the flow work of a heat pump must be minimized. d. Discuss which process is the best for a heat pump among the isentropic, polytropic, and isothermal processes in terms of the P-v property diagram.
6. Using an engine of 45% thermal efficiency to drive a refrigerator having a COP of 3, a. Draw the heat engine and heat pump diagram as described with a suitable label What is the heat input into the engine for 5 MJ removed from the cold body by the refrigerator? b. If this system is used as a heat pump, how many MJ of heat would be available for heating for 5 MJ of heat input to the engine?...
Which of the following statements are true for a reversible adiabatic compressor (multiple answers are possible) O A. Entropy generation is zero B. The compressor is ideal and will consume minimal work OC. The compression process is isentropic OD. Heat may transfer from the compressor to the surroundings
E A heat pump operates on a reversed Carnot cycle with a COP of 7.7. If it keeps a -pace at 25 C by consuming 9.6 kW of power. a. Determine the temperature of the reservoir from which the heat is absorbed, b. Determine the heating load provided by the heat pump. 6 Draw the energy flow diagram of the heat pump. d. Determine the actual COP if its irreversibility is 17 kW. e Determine the second law efficiency of...
For the two cycles, A and B. shown in the figure, which of the statements are true (Mark T) or false (Mark F). Mark all of them TA 5 TH 6 A B T 4 8 The thermal efficiency of B is less than the thermal efficiency of A; b. The cycle A produces more net work than cycle B; c. The cycle A rejects more heat than cycle B; d. The process 5 - 6 is a reversible isobaric...
Answer Description The Carnot cycle attempts to model the most efficient possible process by avoiding what? 1. Adiabatic processes 2. Isothermal processes 3. Irreversible processes 4. Reversible processes For the Carnot cycle, in what type of process is heat added or removed? 1. Adiabatic 2. Isobaric 3. Isochoric 4. Isothermal Which statement is true? 1. n carnot < nactual 2. n Carnot = nactual 3. n carnot > nactual D. A heat engine takes from heat from a reservoir at...
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