1.5 kg of liquid water initially at 12°C is to be heated to 95°C in a teapot equipped with an 800-W electric heating element inside. The specific heat of water can be taken to be 4.18 kJ/kg·°C, and the heat loss from the water during heating can be neglected. The time it takes to heat water to the desired temperature is (a) 5.9 min (b) 7.3 min (c) 10.8 min (d) 14.0 min (e) 17.0 min

Q: Refrigerant-134a at 140 kPa and 210C is compressed by an adiabatic 1.3-kW compressor to an exit…

A: In this problem, the initial temperature is greater than the final temperature so it is not…

Q: 2.2 Air enters a nozzle steadily at 300kPa, 77°C, and 50m/s and leaves at 100kPa and 320m/s. The…

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Q: An isentropic steam turbine processes 2 kg/s of steam at 3 MPa, which is exhausted at 100 kPa and…

A:

Q: and 25oC with a velocity of 30 m/s and exits at 1.8 MPa and 400oC. The compressor

A: In the above calculation considering per unit area means (A=1 m 2).

Q: Air enters a compressor at ambient conditions of 100 kPa and 20°C at a rate of 6.2 m3 /s with a low…

A: Given Data: The inlet pressure is: P1= 100 kPa The pressure after compression is: P2=900 kPa The…

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: Exercise-2 Steam enters a nozzle at 400 deg C and 800 kPa with a velocity of 10 m/s, and leaves at…

A: Given : At inlet of nozzle  1 : At exit of nozzle  2: here negative sign represent the heat loss .…

Q: Steam enters an adiabatic turbine at 8 MPa, 550°C, and 57 (m/s and leaves at 60 kPa, 150°C, and 140…

A: Given: Inlet pressure (P1)=8MPa Inlet temperature (T1)=550°C Exit pressure (P2)=60kPa Exit…

Q: 5-30 Steam enters a nozzle at 400°C and 800 kPa with a velocity of 10 m/s, and leaves at 300°C and…

A: Given:T1=400°CP1=800 KPav1=10 m/sT2=300°CP2=200 KPaQ=-25 KWA1=800 cm2

Q: Steam enters a turbine steadily at 3 MPa and 450°C at a rate of 8 kg/s and exits at 0.2 MPa and…

A:

Q: An inventor claims to have invented an adiabatic steady-flow device with a single inlet-outlet that…

A:

Q: Steam enters an adiabatic turbine at 8 MPa and 500°C at a rate of 3 kg/s and leaves at 20 kPa. If…

A: Given, P1 = 8 MPa T1 = 500°C  P2 = 20 kPa = 0.02 MPa m = 3 kg/s W = 2.5 MW = 2.5 x 103 kW T2 =?

Q: Steam enters a nozzle at 400°C and 800 kPa with a velocity of 10 m/s, and leaves at 3008C and 200…

A:

Q: Steam is condensed in a closed system at a constant pressure of 75 kPa from a saturated vapor to a…

A: Given data as per question Pressure of the condensed steam = 75 kpa thermal energy reservoir…

Q: compressor with a power of 2.39 kW compresses 3.3 kg of refrigerant R-134a per minute. If the…

A:

Q: An adiabatic diffuser at the inlet of a jet engine increases the pressure of the air that enters the…

A: Find the exit temperature     T2=T1(P2P1)κ-1κ= 30+46020111.4-111.4=581.3 R The Energy balance…

Q: Air enters a compressor at ambient conditions of 100 kPa and 20°C at a rate of 6.2 m3 /s with a low…

A: Mass flow rate for air can be determined by using ideal gas equation Work done on compressor in…

Q: Air enters a 36-cm diameter pipe steadily at 400 kPa and 40°C with a velocity of 8 m/s. Air is…

A:

Q: Steam Steam enters a nozzle at 600 kPa and 500°C at a velocity of 9.9 m/s. Steam leaves the nozzle…

A: Given DataP1=600kPaT1=500°CV1=9.9 m/sP2=500kPaT2=300°CA1=250 cm2Q=95 kJ/kg

Q: A hair dryer is basically a duct in which a few layers of electric resistors are placed. A small fan…

A: P1 = 100 kPa T1 = 295 K Q ˙= 1200 J/s T2 = 320 K A2 = 60 cm2 Control volume of a given problem is…

Q: A hair dryer is basically a duct in which a few layers of electric resistors are placed. A small fan…

A: Given Data:-                P =1200w                P1=100kPa                   T1 =22°C…

Q: Refrigerant-134a at 140 kPa and –10°C is compressed by an adiabatic 0.5-kW compressor to an exit…

A:

Q: Air enters an adiabatic nozzle steadily at 302 kPa, 215 oC, and 55 m/s, and leaves at 105 kPa and…

A:

Q: Explain the Reversible work relations for steady-flow and closed systems.

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Q: 3. Air enters the compressor of a gas-turbine plant at ambient conditions of 100 kPa and 25°C with a…

A:

Q: A piston–cylinder device contains 5 kg of saturated water vapor at 3 MPa. Now heat is rejected from…

A: Given Data: The mass of the saturated water vapor is M= 5 kg. The pressure is P = 3 MPa. The…

Q: Steam enters an adiabatic turbine steadily at 6 MPa and 450 °C and leaves at 500 kPa and 250 °C. If…

A: Given Data Inlet temperature of steam is : T1=450°C Initial pressure of steam is : P1=6 MPa=6000…

Q: In a production facility, 1.6-in-thick 2-ft × 2-ft square brass plates (ρ = 532.5 lbm/ft3 and cp =…

A: Given Data: The thickness of plate is t = 1.6 in. The area of plate is A = 2-ft × 2-ft. The density…

Q: Air enters the compressor of a gas-turbine plant at ambient conditions of 100 kPa and 25 °C with a…

A:

Q: Steam enters an adiabatic turbine at 5 MPa, 650C, and 80 m/s and leaves at 50 kPa, 1508C, and 140…

A: Given data: Inlet pressure, P1 = 5 MPa Inlet temperature, T1 = 650°C Inlet velocity, V1 = 80 m/s…

Q: A piston–cylinder device initially contains 2 L of air at 100 kPa and 25°C. Air is now compressed to…

A: Write the given data: V1=2 L=2×10-3 m31000 l1 m3P0=100 kPaTo=25 °C=25+273 (K)=298 KP1=600 kPaT1=150…

Q: Refrigerant 134a enters a compressor with a mass flow rate of 15 kg/s with a velocity of 10 m/s. The…

A:

Q: A house that is losing heat at a rate of 35,000 kJ/h when the outside temperature drops to 4°C is to…

A: Here the  electric resistance heater can be considered as a heat pump.         COP of this…

Q: A piston–cylinder device contains 5 kg of air at 400 kPa and 30°C. During a quasi-equilibium…

A: Given: The mass of the air is m=5 kg. The pressure of the air P=400 kPa. The temperature of air is…

Q: Steam enters an adiabatic turbine at 5 MPa, 650 °C, and 80 m/s and leaves at 50 kPa, 150 °C, and 140…

A:

Q: Steam enters a turbine steadily at 3 MPa and 450°C at a rate of 8 kg/s and exits at 0.2 MPa and…

A:

Q: Air enters the compressor of a gas-turbine plant at ambient conditions of 100 kPa and 25°C with a…

A: The initial conditionsP1=100KPaT1=25°C=298K°V1=0m/s since lgiun as low velocityh1=298.2 KJ/kgThe…

Q: Two rigid tanks are connected by a valve. Tank A is insulated and contains 0.3 m3 of steam at 400…

A: Given data Pressure in rigid tank A is: PA=400 kPa. The quality of steam in tank A is: x=60%. The…

Q: One lbm of R-134a is expanded isentropically in a closed system from 100 psia and 100°F to 10 psia.…

A: Given R-134a Internal pressure = 100 psia Temperature = 100o F Minimum pressure = 10 psia Mass = 1…

Q: Air enters the compressor of a gas-turbine plant at ambient conditions of 100 kPa and 25°C with a…

A: given for a compressor,       inlet conditions   h1 = 298.2 KJ/Kg…

Q: Air enters the compressor of a gas-turbine plant at ambient conditions of 100 kPa and 25°C with a…

A:

Q: In a production facility, 1.6-in-thick 2-ft * 2-ft square brass plates (r = 532.5 lbm/ft3 and cp =…

A: Consider one plate as the system. Write the expression for the change in energy of the system.…

Q: Air enters a compressor at ambient conditions of 15 psia and 60°F with a low velocity and exits at…

A: Given Data Work inlet is: win=400 hp=282.72 Btu/s Heat output is: Q˙=1500 Btu/min=25 btu/s

Q: Determine the work required (in kJ/kg) for a pump that is used to increase the pressure of a liquid…

A: Given: P1 = 100 kPa   P2 = 1500 kPa ,    v = 0.001031 m3/kg Work required for pump to increase the…

Q: Air enters a compressor at ambient conditions of 15 psia and 60°F with a low velocity and exits at…

A: ambient condition, P=15 psiaT=60 oFExit condition, P=150 psiaT=620 oF

Q: A passive solar house that is losing heat to the outdoors at 3C at an average rate of 50,000 kJ/h is…

A: Write the expression of the energy balance of the house.

Q: Air enters a compressor at 14.7 psia and 77°F and is compressed to 140 psia and 200°F. Determine the…

A: Given Data⇒Pressure at inlet and outletP1=14.7 PSiaP2=140 PSiaTemperature at inlet and…

Q: Two rigid tanks are connected by a valve. Tank A is insulated and contains 0.2 m3 of steam at 400…

A: Specific volume of a substance is defined as the volume of the substance per unit mass. Quality of…

Q: Refrigerant-134a is compressed steadily from the saturated vapor state at 120 kPa to 1.6 MPa and 60…

A:

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.