950 K. The efficiency was calculated to be around 45% so it is desired to increase it to 55%. What should be the temperature of the heat source to effect this change, if the heat sink is kept constant? Assume carnot cycle for the heat engine.

Q: Q2/ Determine the maximum possible C.O.P for acyclic heat pump that is to pump heat / from an…

A: Initial ambient temperature, TL1 = -15°CTemperature of interior of house, TH = 25°C

Q: Refrigerant 134-a enters the condenser of a residential heat pump at 800 kPa 35 C at a rate of 0.018…

A:

Q: B/A piston cylinder contains air at 1000 kPa, 800 K with a volume of 0.05 m³. The piston is pressed…

A:

Q: A power plant was analysed based on Carnot cycle, the evaporator supplie 412 kJ of heat per cycle at…

A:

Q: 1. A heat engine with a thermal efficiency of 45 percent rejects 500 kJ/kg of heat. How much heat…

A: Given: The thermal efficiency of a heat engine is η = 0.45 and it rejects heat of Qr = 500 kJ/kg The…

Q: A) An insulated stream of warm water is produced in a steady flow mixing process by combining 1 kg/s…

A:

Q: A Carnot cycle is executed using helium in a closed system between the temperature limits of 350 and…

A: ⇒1-2 : reversible isothermal expansion     2-3 : reversible adiabatic expansion     3-4 : reversible…

Q: 20,000 lb/hr of air is to be cooled from 150°F to 100°F by water flowing in a shell- and-tube heat…

A:

Q: Find the specific work done in a Rankine cycle if the steam supplied at 650 kPa and 0.9 dry and the…

A: The given parameters are:Pressure at which steam is supplied (P1) = 650 kPaDryness fraction (x) =…

Q: 45 kg/h liquid propylene will be cooled from 300 K to 288 K by chilled water through a shell and…

A: Heat capacity of liquid propylene at 294 K is 2.6 kJ/kg-KCp-pl = 2.6 kJ/kg-KFlow rate of liquid…

Q: 2. A quartz radiant heater has two cylindrical tubes 40 cm long and 1 cm radius. The heater is…

A: As per Boltzmann-Stefan’s law, Power emitted per unit surface area can be expressed as J = epsilon x…

Q: Cold water with a mass flow rate of 9800 kg/h is heated from 40 to 115 oC in a countercurrent flow…

A: As per Bartleby guidelines we are supposed to answer only first 3 sub parts. Kindly repost other…

Q: A small domestic heater is used to raise the temperature of 1.8 litres of water from 5 to 100!C…

A:

Q: 2) A 0.68 m³ rigid tank contains refrigerant-134a initially at 100 kPa and 40 percent quality. Heat…

A: Given:   Volume of the rigid vessel, V = 0.68 m3 Initial pressure of R-134a, P1 = 100 kPa Quality of…

Q: A carnot machine operating between 500 K and 298 K temperatures produces 1500J of work in each…

A: Carnot engine is basically operates based on Carnot cycle. Carnot engine is a theoretical heat…

Q: You have a workshop in the back yard of your house where you do carpentry. You like to be at…

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Q: a) The heat removed from water (b) The heat rejected to the surroundings

A: Refrigeration is a process of producing and maintaining a temperature below that of the surrounding…

Q: Draw only the schematic diagram and T-S diagram.

A:

Q: Carnot efficiency of a heat engine between the temperature limits of TH (Higher temperature) and TL(…

A: Carnot engine is a thermodynamic cycle that gives the maximum possible efficiency of a heat engine…

Q: What is the maximum work that canbe obtained from 2000 J of heat supplied to asteam engine with a…

A:

Q: If a heat pump works between-15°C and 50°C. Then, the coefficient of performance is... Select one:…

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Q: 600 kW of heat is removed from a heat exchanger with 200 mol/s formaldehyde flowing through. The…

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Q: Problem 3: A heat pump operating at steady state maintains a dwelling at 22°C on a day when the…

A: COP=Q/Win

Q: Air enters an insulated compressor at ambient conditions, 100 kPa, 20C at the rate of 0.2 kg/s and…

A: Given: P1 = 100kPa T1 = 273+20 = 293K m = 0.2kg/sec T2 = 500K n= 70% Cpo= 1.004kJ/kg.K

Q: If the heat absorbed by a heat engine is 600 kJ per cycle, and it releases 480 kJ of heat each…

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Q: 6. Hot water at 90°C heats air from a temperature of 0°C to 20°C in a parallel flow heat exchanger.…

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Q: The cooling limit temperature T1 is 11 °C , the warm water temperature at the cooling tower inlet…

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Q: In an engine working on an ideal otto cycle, the temperature at the beginning and end of the are…

A: Temperature at the beginning and end of the compression respectively 320C and 4240C.

Q: (a)The efficiency of the cycle (b)The amount of useful work that the machine produces (c)The heat…

A:

Q: A heat pump with a COP = 3 delivers heat to a building that has a UA = 15,000 Btu/hr-ºF. The heat…

A: COP of a heat pump is defined as the relationship with the power  that is drawn out of the pump with…

Q: A furnace is to be designed for a heat duty of 30 x 10° Btu/hr and efficiency of 75%. The furnace is…

A: Calculate  Heat absorbed in the radiation section The no. of tubes in the radiation section Heat…

Q: Saturated-vapour steam at 125 kPa is compressed adiabatičally compressor to 750 kPa at the rate of…

A: Saturated-vapour steam is compressed adiabatically in a centrifugal compressor. Given data: Initial…

Q: What is the log mean temperature difference in °C of a double pipe counterflow heat exchanger where…

A: The log mean temperature difference of counter current heat exchanger is given by:-…

Q: A carnot machine operating between 500 K and 298 K temperatures produces 1500J of work in each…

A:

Q: Compare the COPs for an R-404a vapor-compression cycle, assuming Tcond = 45°C, Tevap = -5°C, Q =…

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Q: Consider the compression of air from 10³ Pa at 27°C to 3x 10° Pa in an ideal two stage compressor…

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Q: An electrical fan and heater are marked as 100 W and 1000 W respectively at 220 V supply. Then the…

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Q: 02: How much thermal energy must be supplied by an electric immersion heater if you wish to raise…

A: