Solve last 3 parts Problem 3Please evaluate and circle the following statements to be True or False. Provide justification/support foryour answers.Better-designed engines would be able to convert all of the input thermal energy to work output.(True / False)A system undergoing a reversible process can return to its initial state without leaving a trace on thesystem or surroundings.(True / False)The COP of a reversible heat pump increases as the temperature of the heated room increases.(True / False)) The maximum performance of a heat engine is governed by the temperatures of the energy sourceand sink.(True / False):) There are no irreversibilities in the system or surroundings during an internally-reversible process.(True / False)

c)The COP of reversible heat pump increases as the temperature of the heated room…

Answered: The COP of a reversible heat pump…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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TRUE OR FALSE 1. Heat flows from hot object to cold object and vice versa, as exhibited by heat pumps.2. It's impossible to have 100% efficient engines, however, it's possible to convert 100% of heat into useful work.3. Natural processes tend to be more ordered than disordered due to entropy.4. The efficiency e of a heat engine is defined as the ratio of the work W done by the engine to the high temperature heat input Qh.5. All heat engines give rise to thermal pollution.
1. In system, no mass can cross its boundary. However, it only allows energy transfer across its boundary o Control system o Closed system o Isolated system 2. Heat transferred to a system and work done by a system are always positive. o True o False 3. —— is a device that decreases the velocity of a fluid by increasing its pressure. o Nozzle o Diffuser o Compressor o Turbine 4. A heat engine may not reject any heat to a low-temperature reservoir and still can complete a cycle. o True o False 5. Heat is removed from the compartment of a refrigerator at a rate of 250 kJ/min. The refrigerator consumes 0.8 kW, determine the COP of the refrigerator. 6. It has been proved experimentally by joule that the internal energy is a function of o Temperature only o Pressure only o Volume only o All together 7. The combination of flow energy and internal energy gives - 8. A process during which there is no heat transfer o Adiabatic o Isentropic o Polytropic o Isothermal 9. Heat is transferred to a…
Multiple choice Questions Any reversible path may be substituted by a reversible zigzag path between the same end processes such that the heat transfer during this zigzag path is equal to the heat transfer during original path. What are theprocesses involved in the zigzag path? a.reversible polytropic and isobaric processb.reversible polytropic and isothermal processc. reversible adiabatic and isothermal processesd. none of the above
Q5. Discuss the following scenarios related to the first law of thermodynamics: a) On a hot summer day, a workshop employee turns his fan on when he leaves the room in the morning. When he returns in the evening, will the room be warmer or cooler than the neighbouring rooms? Why? Assume all the doors and windows are kept closed. b) A water pump that consumes 5 kW of electric power when operating is claimed to take in water from a lake and pump it to a pool whose free surface is 50 m above the free surface of the lake at a rate of 70 L/s. Determine if this claim is reasonable. c) A pump increases the pressure from 10 kPa to 70 kPa. Determine the power input required, to pump 2 m/s of water, given the inlet temperature of 15 °C. Does the inlet temperature have any significant effect on the required power?
Q1. Solve all parts Depicted in Fig. Q1 is an irreversible refrigerator whose compressor is powered by a reversible heat engine that operates between temperature extremes Thot = 473K and cold = 293 K. The refrigerator depicted uses a dichlorodifluoromethane refrigerant (Refrigerant 12) circulating by means of the compressor at mass flow rate = 0.15 kg/s. The other components of the refrigerator are two heat exchangers in the form of an evaporator and a condenser, and a throttle valve. Information recorded at the state points depicted in Fig. Q1 is as follows: State point 1: dryness fraction x₁ = 1 and temperature t₁ = 15 °C. State point 2: dryness fraction x2 = 0 and temperature t₂ = 15°C. State point 3: wet vapour at temperature t₁ = -20°C. State point 4: wet vapour at temperature t₁ = -20°C. (a) Determine the thermal efficiency NR of the reversible heat engine depicted in Fig. Q1, and consequently determine power -W4-1 supplied to the compressor given that the rate of heat supplied…
A closed system undergoes a thermodynamic cycle with 2 steps: process 1-2 (from state 1 to state 2), process 2-1 (from state 2 to state 1). During process 1-2, the system received energy by heat transfer of 25J. During process 2-1, energy was transferred from the system to its surrounding by heat transfer of 15J. This is a power cycle. True or false?
The first step of a thermodynamic cycle is an isobaric process with increasing volume. The second is an isochoric process, with decreasing pressure. The last step may be either an isothermal or adiabatic process, ending at the starting point of the isobaric process. Sketch a graph of these two possibilities, and comment on which will have greater net work per cycle.
A heat engine converts mechanical work to heat. Select one: O True O False
At steady state, a heat pump driven by an electric motor maintains the interior of a building at TH=293 K. The rate of heat transfer, in kJ/h, from the building through its walls and roof is given by 8000(TH-TC), where Tc is the outdoor temperature. Determine the minimum electric power, in kW, required to drive the heat pump for Tc = 276 K. (W cycle) min = i eTextbook and Media Save for Later kW Attempts: 0 of 5 used Submit Answer
For any cyclic process in the closed system, relationship between heat and work shall be dQ = dw Select one: True O False
Ts diagrams for two reversible thermodynamic power cycles are shown in the following fig- ure. Both cycles operate between a high temperature reservoir at 500 K and a low temperature reservoir at 300 K. The process on the left is the Carnot cycle described in Section 2.9. The process on the right is a Brayton cycle, which is similar to a Carnot cycle, except that the two steps (state 1 to state 2) and (state 3 to state 4) are at constant pressure. Which cycle, if either, has a greater efficiency? Explain.
Choose your answer from the options listed inside the parenthesis: A reversible heat engine produces the (minimum/maximum) amount of work, while a reversible refrigerator/heat pump require the (minimum/maximum) work input.

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