At 101.325 kPa, the latent heat of boiling latent heat of water is 2257 kJ/kg. Calculate the amount of heat that must be added to 1 kg of water at 27°C in order to boil. *
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- A four-effect evaporator is being considered for concentratinga fruit juice that has no appreciable boiling-point elevation.Steam is available at 143.27 kPa, and the boiling point of the product in the fourth effect is 45°C. The overall heat-transfer coeffi cients are 3000 W/(m 2 °C) in the fi rst effect, 2500W/(m2 °C) in the second effect, 2100W/(m2°C) in thethird effect, and 1800W/(m2°C) in the fourth effect. Calculatethe boiling-point temperatures of the product in the fi rst,second, and third effects. Assume the heating areas in all theeffects are equal to 50m2 each. The mass fl ow rate of steam tothe fi rst effect is 2400kg/h, the feed rate to the fi rst effect of 5%total solids fl uid is 15,000kg/h, the concentrated product fromthe fi rst effect leaves at 6.25% total solids, and the concentrationof product leaving the second effect is 8.82% total solids. Make it in the form of an example solution spreadsheet .....Calculate the amount of heat required (in kJ) to raise the temperature of 23.4 g of ice at -11°C to steam at 135°C. ΔHvap = 40.67 kJ/mol, ΔHfus = 6.008 kJ/mol, Cice = 2.092 J/g°C, Cwater = 4.184 J/g°C, Csteam = 1.841 J/g°C, Melting point = 0.00°C, Boiling Point = 100.0°CFour cubic meters of water is to be heated by means of four 1.5 kW, 230-V immersion heating elements. Assuming the efficiency of the heater as 90%, determine the time required in boiling the water if the initial temperature is 20°C and if the elements are connected two in series in parallel with two in series. the answer is 275.6 hrs (According to the ECE board exam answer key) can you show me the solution?
- On a hot humid summer day, the air can be considered saturated steam at 950C. If you were to take an ice-cold beverage (40C) from the cooler, you would notice drop-wise condensation on the side of the can forming. What is the condensation heat transfer coefficient for the cold can? Assume the can is 12-cm tall and has a diameter of 8-cm.A four-effect evaporator is being considered for concentrating a fruit juice that has no appreciable boiling-point elevation. Steam is available at 143.27 kPa, and the boiling point of the product in the fourth effect is 45°C. The overall heat-transfer coeffi cients are 3000 W/(m 2 °C) in the fi rst effect,2500W/(m2 °C) in the second effect, 2100W/(m2°C) in the third effect, and 1800W/(m2°C) in the fourth effect. Calculate the boiling-point temperatures of the product in the fi rst,second, and third effects. Assume the heating areas in all the effects are equal to 50m2 each. The mass fl ow rate of steam to the fi rst effect is 2400kg/h, the feed rate to the fi rst effect of 5% total solids fl uid is 15,000kg/h, the concentrated product from the fi rst effect leaves at 6.25% total solids, and the concentration of product leaving the second effect is 8.82% total solids.A 20% (by wt) sodium hydroxide solution is being concentrated to 50% (by weight) using an evaporator at 311 K. The saturated steam used for heating is 399.3 K. The pressure in the vapor space of the evaporator is 13.3 kPa abs. If the overall heat transfer coefficient is 1420 W/m2-K and the area is 86.4 m2, calculate the feed rate of the evaporator.
- How much much heat must be supplied to water at 180 degrees celcius to make 1 kg of wet steam at 9000 kpa , having a dryness fraction of 80% ? .A four-effect evaporator is being considered for concentrating fruit juice that has no appreciable boiling-point elevation. Steam is available at 143.27 kPa and the boiling point of the product in the fourth effect is 45°C. The overall heat transfer coefficients are 3000W/m2°C in the first effect, 2500W/m2°C in the second effect, 2100W/m2°C in the third effect, and 1800W/m2°C in the fourth effect. Calculate the boiling-point temperature of the product in the first, second and third effects. Assume the heating areas in all the effect are equal to 50m2 each. The mass flow rate of steam to the first effect is 2400 kg/h. The feed rate to the first effect of 5% total solids fluid is 15,000kg/h, the concentrated product from the first effect leave at 6.25% total solids, and the concentration of product leaving of the second effect is 8.82% total solids.Will the largest condensation heat transfer coefficient always be obtained for a horizontal finned tube with the maximum possible fpm?
- 6. A vertica platc 450 mm high and maintained at 3°C is exposed o satuated seam atatmospheric pressare. Calculte: (1) The rate of hea ransfe, and () The condensate a per hour per mete for plae widih film condensation. “The propertiesof waer im at the mean temperaure are: 0.3 kg/m sk = 6.4 x 10 WinC; = 434 x 10° kg/ms; and b = 22569 kg [Ans. 4399 x 10° kI, 2188 ke/h]What is entropy? Write entropy equation. What happens to the entropy in ideal isobaric heatingprocess? Show this process on Pv and Ts diagram.How much heat is needed to completely vaporized 100 kg of ice at -10 C if the pressure held constant 200kPa. latent heat of fusion at 200 kpa is 320 kj/kg latent heat of vaporization at 200 kpa is 2 202 kjkg. show t.s Diagram and all units.