The value of the Log Mean Temperature
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- and exits at 50°C. The value of the Log Mean outside of a tube. Cold enters the tube at 20°C Saturated steam at 100°C condenses on the °C. Temperature Difference (LMTD) isWhat is the equivalent evaporation of the boiler? Determine the specific heat capacity of the delivered steamAn evaporator is concentrating F kg/hr at 311K of a 20 wt % solution of NaOH to 50%. The saturated steam used for heating is at 399.3 K. The pressure in the vapor space of the evaporator is 13.3 kPa abs. The overall coefficient is 1420 W/. K and the area is 86.4 square meters. Calculate the feed rate F of the evaporator.
- Liquid ammonia at 30°C is metered through an expansion valve to an evaporator operating at a saturation temperature of -5°C. Calculate the dryness fraction of the refrigerant entering the evaporator. 21.7% 0.1288% 12.88% 15.78%AH of vaporization of water is 439.2 cal/g at the normal boing point. Since virus can survive at 404.39 K by forming spores. Most virus spores die at 851.9 K. Hence, autoclaves used to sterilize medical and laboratory instruments are pressurized to raise the boiling point of water to 851.9 K. Find out at what InP (torr) does water boil at 851.9 K? O a. 8460.435 O b. 940.048 c. 1880.097 O d. 2.474An R-22 compressor has a 5 percent clearance volume and a displacement rate of 80 L/s and pumps against a condensing temperature of 40°C. For the two different evaporating temperatures of -10 °C, compute the refrigerant flow rate in kg/s assuming that the clearance volumetric efficiency applies.
- Estimate the power required to boil the water in a copper pan (Cs,f = 0.013 and n = 1), 180 mm in diameter. The bottom of the pan is maintained at 115 ℃ by the heating element of an electric range. Properties of Water (1 atm): Tsat = 100℃, ρl = 957.9 kg/m3, ρv = 0.5955 kg/m3, Cpl = 4217 J/kg.K, μl = 279*10^-6 N.s/m2, Prl = 1.76, hfg = 2257 kJ/kg, σ = 58.9*10^-3 N/m. Select one: a. 16420 W b. 18166 W c. 16240 W d. 11760 Win a surface condenser the pressure of steam is Q12 bar. The rote of cooling water flow is 40 kgAg of steam condensed Condensate teaves at 44°C and dhe rise in termperature of circuiating water is 13°C Determine the dryness fraction of steam entering the condenser.Steam at a pressure of 28kpa is passed into condenser and it leaves as condensate at a temperature of 592 0 Cooling water circulates through the condenser at the rate 9 of 45 kg/min. It enters at 152 and leaves at 30°C.It the Steam flow rate is 1.25 kg/min, determine the dryness r fraction of Steam as it enters the condenser.
- 6 In a boiler test, the following observations wcre made: 358 A Text Book of Thermal Engineering Feed water temperaturç e= 12" C; Pressure of steam = 11 bar; Dryness fraction of steam 095 Mass of coal burnt 300 kg/h, Calorific value of coal 32 000 kJkg of coal; Mass of water supplied to boiler in 7 hrs 14 min= 14 625 kg. The mass of w ster in the boiler at the end of the test was less than that at the commencement by 900kg. Calculate I. Actual evaporation per kg of coal: 2 Equivalent evaporation from and at 100 C per kg [Ans. 7 15 kg, 8 33 kg: 58.75 % of coal ; and 3. Thermal efficiency of the boilerA surface condenser is designed to handle 12000 kg of steam per hour. The steam enters at 0.8 kPa, 0.9 dry. The condensate leaves the condenser at the corresponding saturation temperature. Calculate the rate of cooling water, if cooling water temperature rise is limited to 12°C.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 .....