A completely reversible heat pump produces heat at a rate of 300 kW to warm a house maintained at 24oC. The exterior air, which is at 7oC, serves as the source. Calculate the rate of entropy change of the two reservoirs and determine if this heat pump satisfies the second law according to the increase of entropy principle.

Q: An adiabatic turbine operates with air entering at 550 kPa, 425 K, and 150 m/s and leaving at 110…

A: The enthalpy at inlet point by using table A-17, at P1 = 550 kPa, T1 = 425 K The enthalpy at outlet…

Q: A reversible Carnot engine operates between 27°C and 1527°C, and produces 400 kW of net power. The…

A: Given, Temperature at which heat is added = T1 = 1527 oC = 1800 K Temperature at which heat is…

Q: A  well insulated steam turbine receives steam at temperature T1 = 540 °C and pressure p1= 30 bar.…

A: A turbine is a thermodynamic equipment which converts the thermal energy of the steam into useful…

Q: A heat pump unit operates between two heat reservoirs with temperatures of 270 and 330 K. The heat…

A: Given, Temperatures of hat reservoirs ,                  T1 = 270 K , T2 = 330 K The temperature…

Q: Problem-1: Water steam flows steadily through an adiabatic turbine. The inlet condition steam are 4…

A:

Q: Q3) 35% Steam enters an adiabatic turbine steadily at 7 MPa. 500°C. and 45 m/s, and leaves at 100…

A:

Q: An engine works between two reservoirs at 967 K and 293 K, respectively. It takes 2.50 kJ of heat…

A:

Q: A proposed heat pump design creates a heating effect of 25 kW while using 5 kW of electrical power.…

A:

Q: Superheated steam enters the turbine of a steam power plant at 5 MPa and 450 ºC, and exits at 10…

A: Given:P1=5 MPaT1=450°CP2=10 KPaη=90%m=10 Kg/s

Q: Prove that the “cycle” consisting of only two adiabatic steps (reversible expansion and  then…

A:

Q: Steam enters an adiabatic turbine at P1 MPa and T1°C with a mass flow rate of z kg/s and leaves at…

A:

Q: The connections of a reversible engine to three sources at 550 k,450 k and 250k are shown in fig. It…

A: given: lets take: heat draws frm source 550K=1600kj/min net work=200kj/min

Q: During the isothermal heat rejection process of a Carnot cycle, the working fluid experiences an…

A: Given: The temperature of the sink is T2=95°F. The entropy change of the fluid is ∆S1=-0.7 Btu/R.…

Q: A refrigeration unit operates between two heat reservoirs with temperatures of 240 and 320 K. The…

A: Since low temperature reservoir is at 240K but it is not the refrigerant temperature and refrigerant…

Q: 4. A typical heat engine shown in the figure, determine the heat lost to the cold reservoir?…

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Q: Problem-1: Water steam flows steadily through an adiabatic turbine. The inlet conditions of the…

A: As per bartleby guidelines we are allowed to solve only 1st 3 subparts if multiple subparts are…

Q: A completely reversible air conditioner provides 36,000 Btu/h of cooling for a space maintained at…

A: Given: The cooling capacity of the refrigerator, Qc = 36,000 Btu/h The temperature of the cold…

Q: A steam turbine operates adiabatically at a power level of 3500 kW. Steam enters the turbine at 2400…

A:

Q: Heat is transferred directly from a heat reservoir at 200◦C to another heat reservoir at 5◦C. If the…

A: The temperature of heat reservoir = 2000 c The temperature of heat sink = 50 c Amount of heat…

Q: Water vapor enters an adiabatic turbine at a pressure of 15 MPa and a temperature of 1000 ° C, with…

A: we can use  steam table and mollier chart  to get the  value of entropy S1 at 1000° C and 15 Mpa…

Q: In an ice-making plant, water at 0°C is frozen at atmospheric pressure by evaporating saturated…

A: Given data: Water temperature, Tw=0°C Refrigerant temperature, Tr=-16°C Mass flow rate of ice,…

Q: A reversible adiabatic nozzle allows air to expand from 600kpa and 700K to 100kpa. If the air enters…

A:

Q: Steam is expanded in an adiabatic turbine from 3000 kPa and 450°C to 0.2 MPa. If the process is…

A: GivenP1=3000kPa=3MPaT1=450oCP2=0.2MPa

Q: Cold water (cp = 4.18 kJ/kg⋅°C) leading to a shower enters a well-insulated, thin-walled,…

A: Given Data: The specific heat of cold water is cpc = 4.18 kJ/kg⋅°C. The inlet temperature of cold…

Q: In a power station, saturated steam is generated at 252°C by transferring heat from the hot gases…

A: Entropy: The randomness of the system is known as entropy. According to the second law of…

Q: Water vapor enters a reversible-adiabatic (isentropic) turbine with 4 MPa pressure, 500C…

A:

Q: Problem-1: Water steam flows steadily through an adiabatic turbine. The inlet conditions of the…

A: we have P1=4Mpa =4 x 106 PaT1=500°Cm=12kg/sP2=30 kpan=92% =0.92we have to find,(a) White balanced…

Q: Air enters the compressor of a gas turbine plant at ambient conditions of 100 kPa and 25 ⁰C with a…

A:

Q: Steam at 7 MPa and 400°C enters a two-stage adiabatic turbine at a rate of 15 kg/s. Ten percent of…

A: Given : P1=7MPaT1=400°Cm = 15 kg/sP2=1.8 MPaP3=10 kPaη = 88%T∞=25°C

Q: During the isothermal heat rejection process of a Carnot cycle, the working fluid experiences an…

A: We have 1 Btu/R = 1.9×103 J/KEntropy Change of Working Fluid =-0.7 Btu/R = -0.7×1.9×103 =-1330…

Q: Liquid water enters an adiabatic piping system at 15°C at a rate of 8 kg/s. If the water temperature…

A: Given data: The initial temperature, T1 = 15oC. The rise in temperature, ∆T = 0.2oC. The mass flow…

Q: Refrigerant-134a enters an expansion valve at 1200 kPa as a saturated liquid and leaves at 200 kPa.…

A: Given Refrigerant = 134 a Expansion valve pressure = 1200 kPa Outlet pressure of expansion valve =…

Q: A heat engine used a steam as working fluid has 3 kg/s and initial the steam undergoes to expansion…

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Q: Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and 300 K to an…

A: Given Inlet of compressor pressure = 100 kPa Inlet temperature = 300 K Exit pressure = 900 kPa…

Q: To control an isentropic steam turbine, a throttle valve is placed in the steam line leading to the…

A: The entropy and enthalpy at the inlet of the turbine are found using given pressure and temperature…

Q: During the isothermal process of a cannot cycle,the working fluid experiences an entropy change of…

A:

Q: Air flows into an adiabatic nozzle at 500 kPa and 400K at a speed of 30 m/s and exits the nozzle at…

A:

Q: Steam is to be condensed in the condenser of a steam power plant at a temperature of 60°C with…

A: Given data m=75 kg/sC=4.18 KJ/kgKT2=27°cT1=18°chevap,60=2357.6 KJ/kg

Q: Given 603.06 kW electrical power supplied to a boiler when the temperature of the entering water is…

A: On the basis of entropy and enthaly table,

Q: Question 33 A preheater used in a power plant preheats the boiler feed water by mixing water with…

A:

Q: Steam at 6000 kPa and 500°C enters a steady-flow turbine. The steam expands in the turbine while…

A: Solution: Let initial mass flow rate be 1kg/s Since two state properties are needed to define a…

Q: An inventor claims that a new refrigerator can operate between -15 o C and 150 o C while removing…

A:

Q: Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and 300 K to an…

A: Obtain the pressure ratio.

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.