In a heat exchanger, the heat transfer depends on the choice of the control volume
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Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
In a heat exchanger, the heat transfer depends on the choice of the control volume
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- Separate streams of steam and air flow through the turbine and heat exchanger arrangement shown in the figure below, where ins = 1500 kg/min and W;1 = 8,000 kW,. Steady-state operating data are provided on the figure. Heat transfer with the surroundings can be neglected, as can all kinetic and potential energy effects. Wn W2 = ? Turbine Turbine 2 P3 = 10 bar T3 =? T = 240°C T2 = 400°C P2= 10 bar P4=1 bar www Steam in 2 T = 600°C PI = 20 bar Ts = 1500 K -5 Ps = 1.35 bar 9. Heat exchanger V T6 = 1200 K P6 = 1 bar Air in Determine: (a) T3, in K. (b) the power output of the second turbine, in kW.What are the Difference of a Open Heater to a Closed heat exchanger?The pressurized water that enters a cross-flow heat exchanger with a flow of 1 kg / s at 35 ° C and leaves at 125 ° C, where fluids do not mix, is heated by exhaust gases entering the heat exchanger at 300 ° C and exiting at 100 ° C. . The total heat transfer coefficient defined according to the surface on the gas side is 100 W / m ° K. Thermal properties of exhaust gases are considered as atmospheric air. a) Find the required surface area on the gas side. (15P) Due to the contamination that occurs over time, the inlet temperature and flow rate of the water in the heat exchanger remain the same, while the outlet temperature drops to 105 ° C *.a) Calculate the new condition with the acceptance of fixed thermal properties, b) Heat transfer, c) Exhaust gases exit temperature.
- Consider the steady-state counterflow heat exchanger shown below. There are separate streams of air and water, and each stream experiences no noticeable change in pressure. Stray heat transfer with the surroundings and changes in kinetic and potential energy can be ignored. For the air, the ideal gas model can be applied and Rair = 0.287- For the operating conditions provided on kg-K the figure, determine: a. The temperature of the air at the outlet of the heat exchanger, T4, in [K] b. The rate of heat transfer between the air and the water, in [kW; , c. The rate of entropy production for the heat exchanger, in [kW/K] kg msteam = 12 P1 = 3 bar X1 = 1 P2 = P1 T2 = 200 P3 = 1 bar T3 = 1100 K P4 = P3 T, =? mair kg = 3.29Separate streams of air and water flow through the compressor and heat exchanger arrangement shown in the figure below, where m, 0.6 kg/s and To = 30°C. Steady-state operating data are provided on the figure. Heat transfer with the surroundings can be neglected, as can all kinetic and potential energy effects. The air is modeled as an ideal gas. 1 Air P₁ = 1 bar T₁ = 300 K m Compressor A P2=3 bar -2 T₂=600 K Determine: WEVA ܒܝ www wwww +6 T6, P6-Ps P₁ = 9 bar T₁=800 K Compressor B 3- P3 P2 T₁=450 K Heat exchanger 5+ 4 Water T5= 20°C Ps= 1 bar (a) the total power for both compressors, in kW. (b) the mass flow rate of the water, in kg/s. WevB =A compressor is used to increase air pressure with the assumption that there is no heat transfer from/to the compressor. The air is entering at 150 kPa and 37 C and leaving at 650 kPa and 227 C with 250 kg/min as mass rate. The constant-pressure specific heat of air is 1.011 k/kg, and the gas constant is 0.287 k/kg.K while the surrounding is 27"C and 100 kPa. a. Deterrmined the entropy charnges of air after the process. b. Determine the reversible power of the compressor in kW.
- Determine the temperature of the entering steam, in oC.For the overall heat exchanger as the control volume, what is the rate of heat transfer, in kW. Step by step solution please thank you.Shown below is a heat exchanger used to cool down the liquid in the tube. The shell is well insulated. (2) If inner walls of the shell are system boundaries, and liquids within system boundaries (the liquid between the shell and tube and the liquid in the tube) are chosen as the system, select the correct energy balance equation._____________ A. B. C. D.7. Air to H20 heat exchanger: Air enters a heat exchanger at (2000 F, 15 psia) and exits at (500 F, 15 psia). Saturated liquid H20 enters the heat exchanger at 300 F. The H20 is heated at a constant pressure and exits as a saturated vapor. The outer shell of the heat exchangers is insulated. The flow rate of the H20 is 100,000 Ibm/hr. Deterimine a. The volumetric flow rate of the air at the inlet (cfm) b. The rate of entropy generation within the heat exchanger (Btu/R/s)
- 3.24 You want to cool air from 150°C to 60°C but you cannot afford a custom-built heat exchanger. You find a used cross-flow exchanger (both fluids unmixed) in storage. It was previously used to cool 136 kg/min of NH3 vapor from 200°C to 100°C using 320 kg/min of water at 7°C; U was previously 480 W/m²K. How much air can you cool with this exchanger, using the same water supply, if U is approximately unchanged? (Actually, you would have to modify U using the methods of Chapters 6 and 7 once you had the new air flow rate, but that is beyond our present scope.)Homework: A counterflow heat exchanger is located between a collector and a storage tank. The fluid in the collector side is a water-glycol mixture with cp=3840 J/kg. °C and a flow rate of 1.35 kg/s, whereas the fluid in the tank side is water with a flow rate of 0.95 kg/s. If the UA of the heat exchanger is 5650 W/°C, the hot glycol enters the heat exchanger at 59°C, and the water from the tank at 39°C, a) estimate the heat exchange rate; b) if FRUL is 5.71 W/m².°C and collector area is 16 m², what is the ratio FR/FR?A heat exchanger uses medium pressure steam at 10 bar and 350 C to heat cyclohexane vapor from 100 C up to 275 C as shown in the figure below. The steam is available at a flowrate of 32 kg/h and it condenses completely in the heat exchanger and exits as saturated liquid condensate at 10 bar. a) How much heat (in kW) can be provided by the steam? b) How much cyclohexane can be processed in kg/h? Vapor Cyclohexane T = 100 C P = 1 atm Steam T = 350 C = 10 bar Condensate P Vapor Cyclohexane T = 275 C P = 1 atm P = 10 bar