A passive solar house that is losing heat to the outdoors at 3C at an average rate of 50,000 kJ/h is maintained at 22C at all times during a winter night for 10 h. The house is to be heated by 50 glass containers, each containing 20 L of water that is heated to 80C during the day by absorbing solar energy. A thermostat-controlled 15 kW backup electric resistance heater turns on whenever necessary to keep the house at 22C. Determine how long the electric heating system was on that night and the amount of entropy generated during the night.

Q: n in the figure below, a closed, rigid tank fitted with a fine-wire electric resistor is filled with…

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Q: If the steam undergoes a process under Pv^1.273 = C, and the work steady flow is found to be 496.74…

A: given; PV1.273=Csteady flow work(w)=496.74BTUnon-flow work(w1)=?

Q: A 15'x12'x15'(LXWXH) room with temperature at 70°F dB and 50°F wB needs SA with air change rate 10…

A: The dimension of the room is 15×12×15 in. The dry and wet bulb temperatures of the room are TR1=70°F…

Q: (6)A mass of 1 kg of air is contained in a variable-load piston device equipped with a paddle wheel.…

A: This is a problem of first law of heat and work transfer.

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Q: expends 169.55 kJ of energy while pressurizing 7.683 kg of water initially at 11.25°C. The…

A: Image_1

Q: An ideal gas in a piston-cylinder is heated with 5 kJ during an isothermal process. How much work is…

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Q: PROBLEM # 2 A piston-cylinder containing 12 Ib of air receives heat at a constant temperature of…

A: Given, Constant temperature, T=900.6 0R Mass of the air, m=12 lb The initial pressure, pi=29…

Q: 10 kg of water is cooled from 35 °C to 5 °C in a reversible refrigerator. The refrigerator extracts…

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Q: (Q1) A 5m x 8m × 4m room contains air at 97 kPa and 8°C. The room has a 380 W refrigerator, a 200 W…

A: Given data, Dimension of the room is 5×8×4 m So, volume of the room, V=5×8×4=160 m3 Initial…

Q: 7. When 0.6 litre (1litre = 10-3 m³) of water in an electric kettle is heated from 20°C to 85°C to…

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Q: If the steam undergoes a process under Pv1.319 = C, and the work steady flow is found to be 372.75…

A: Given data, Pv1.319 = C  Here n= 1.319 , and process is polytropic,  When the flow is steady - W=…

Q: To sterilize a 50.0-g glass baby bottle, we must raise its temperature from 15.5°C to 95.0°C. How…

A: The given values are - m = 50gm=501000kgC = 840 J/kg°C∆T = Change in temperature = 95 - 15.5°C =…

Q: A Carnot engine receives 120 BTU of heat form a hot reservoir at 740 °F and rejects 58 BTU of…

A: GIVEN DATA- Higher Temprature T1=740'F Heat Supplied Q1=120BTU Heat Rejected Q2=58BTU We have to…

Q: A piston-cylinder assembly contains R-134a refrigerant in a volume of 0.15 m3, 0.28 MPa and 40 ° C.…

A: Given data, Process 1-2 :- According to the question, a pin fixed the piston at a point. Now, the…

Q: Don't use chatgpt will upvote

A: 1. Vertical Position EquationY(t)=V0​t−21​gt2V0​ is the initial speed of the ball,g is the…

Q: Steam turbine is receiving a 1,831 lb/hr of steam, determine the kW output of the turbine if the…

A: Given: m˙=1831 lb/hr WT,out =1906 btu/lb

Q: A device expends 172.31 kJ of energy while pressurizing 8.812 kg of water initially at 11.44°C. The…

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Q: steam engine isentropically expands 5 kg/s of steam from 0.68 MPa, 220°C. the exhaust is dry and…

A: Given Data State 1: 0.68 MPa, 220°C State 2: dry saturated m= 5 kg/s

Q: A piston-cylinder device with a set of stops initially contains 0.4 Kg of steam at 800 KPa and 400…

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Q: A device expends 164.78 kJ of energy while pressurizing 7.737 kg of water initially at 11.65°C. The…

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Q: Three hundred kilojoules of heat is added in a piston cylinder arrangement containing air causing it…

A: Polytropic heat addition and work done relation is used.

Q: shown in the figure below, a closed, rigid tan ality of 80%, and a volume of 0.01 m². A 12-v…

A: Refrigerant 22, Initial -Temperature, T1 = -10°C Final - Temperature, T2 = 50°C Quality, x1 = 80 %…

Q: expends 185.01 kJ of energy while pressurizing 3.161 kg of water initially at 14.6°C. The efficiency…

A: Image_1

Q: A single-acting air compressor is required to compress 0.66 m³ of air from 1.3 bar to 9.5bar at…

A: Given, V1 = 0.66 m3 P1 = 1.3 bar = 1.3 x 105 N/m2 P2 = 9.5 bar = 9.5 x 105 N/m2 T1 = 28 C = 301 K n…

Q: Is it true during an adiabatic process, a system exchanges no heat with its surroundings. If it is…

A: The given statement is true. During an adiabatic process, there is no heat exchange between the…

Q: A device expends 174.78 kJ of energy while pressurizing 3.472 kg of water initially at 17.4°C. The…

A: Useful heat given by the system will be used to raise the water temperature. Q = 174.58 kJ…

Q: A device expends 167.88 kJ of energy while pressurizing 3.77 kg of water initially at 10.78°C. The…

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Q: A piston-cylinder device contains 1.20 kg of steam at 300°C and 1 MPa. The steam is cooled until 25%…

A:

Q: A closed system undergoes a frictionless process from 200 psia and 3 ft during which theproduct…

A: Given data,  P1= 200 psia,  V1= 3 ft³  P2= 40 psia  PV1.3= constant

Q: A device expends 171.14 kJ of energy while pressurizing 2.531 kg of water initially at 16.1°C The…

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Q: A device expends 170.14 kJ of energy while pressurizing 4.797 kg of water initially at 10.52°C. The…

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Q: A device expends 145.6 kJ of energy while pressurizing 3.097 kg of water initially at 14.81 degrees…

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Q: a device expends 177.93 kJ of energy while pressurizing 6.347 kg of water initially at 10.57oC. the…

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Q: A piston-cylinder device has a 2 kg refrigerant R-134. The piston, which has a diameter of 20mm and…

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Q: If the steam undergoes a process under Pv^1.175 = C, and the work steady flow is found to be 495.90…

A: Pv1.175=CFlow=495.90BTU To-Find:- Work non-flow

Q: device expends 142.26 kJ of energy while pressurizing 3.93 kg of water initially at 12.88°C. The…

A: Given:Q=142.26 KJm=3.93 KgT1=12.88°Cη=59.73%

Q: A furnace can supply heat steadily at 1300 K at a rate of 200 kJ/s. The maximum amount of power that…

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Q: Air contained in a variable-load piston-cylinder is initially at 0.1 m3 , 22°C, and 100 kPa. The…

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Q: A refrigerator operating between -5°C and 27°C has the capacity of 80 tons. Determine the number of…

A: Write the given data in the problem.  m=10 kgT1=27°CT2=0°C Here, m is the mass of the refrigerator,…

Q: A device expends 152.03 kJ of energy while pressurizing 6.953 kg of water initially at 11.81°C. The…

A: Given data:-  Work expended(w) = 152.03 kJ                   Mass(m) = 6.953 kg…

Q: A flat plate of glass, having a height of 1 ft is heated to 200 F in an annealing furnace. The plate…

A: Given data Length of flat plate = 1 ft = 0.3048 m Temperature of flat plate = 200 F = 366.4833 K…

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.