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In an existing heat exchanger of counter flow type, dry air is cooled from 70°C to 35°C at a rate of 1.2 kg/s using cold air at 15°C at a rate of 1.5 kg/s. It is desired to cool this stream by another 10°C by increasing the area with the same inlet conditions. Predict the percentage increase in area
9.36 In a nuclear power plant the reactor transfers the heat to a flow of liquid sodium, which in a heat exchanger transfers the heat to boiling water. Saturated vapor steam at 5 MPa exits this heat exchanger and is then superheated to 600°C in an external gas-fired superheater. The steam enters the turbine, which has an extraction at 0.4 MPa to an open FWH, and the condenser pressure is 10 kPa. Determine the heat transfer in the reactor and...
(a) (i) For a power cycle, the heat transfers are Qin=60 kJ and Qout=40 kJ. Determine the net work, in kJ, and the thermal efficiency. (ii) A refrigeration cycle operates with a coefficient of performance β=1.5. For the cycle, Qout=500 kJ. Determine Qin and Wcyele each in kJ.(b) A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes:Process 1-2: Compression with p V= constant, from p₁=1 bar, V₁=1.6 m³ to V₂=0.2 m³, U₂-U₁=0.Process 2-3: Constant pressure to...
As 390 g of hot chocolate cools in a mug, it transfers 30,000J of heat to the environment. What is the temperature of the hot chocolate after it has cooled? The specific heat of milk is 3.9 J/goC.
A hot reservoir at the temperature 650 K transfers 2000 J of heat irreversibly to a cold reservoir at temperature 200 K. A) What is the change in entropy of the universe? B) Is entropy a conserved non-conserved quantity?
A source of heat at 1000 K transfers 1000 kW of power to a power generation device, while producing 300 kW of useful work. Determine: a. The rate of exergy destruction in this process, if the atmosphere is at 300K. The second law efficiency of the system. b.
a transducer is a device which.... a) transfers heat energy from an electrical component to surrounding air. b) send electrical signals from one place to another. c)undergoes an electrical change in response to a physical change.
0. If an object transfers 5294 J of heat to a 35.0 g sample of water, how much would the temperature increase?
just answer and discuss one Review QAS a. Energy transfers by heat are induced only as a result of a temperature difference between a system and its surroundings. b. Work and heat are associated with the process, so they are point functions C. If a system undergoes a process involving heat transfer with its surroundings but no work, that process is said to be adiabatic. d. The change in the internal energy of a system between two states is the...