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- 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 WA stream of CO2 at pressure 1 bar, flowing at 10 mol/s, from 150°C to 300°C is to be heated ina counter current heat exchanger. To do this task a stream of high-pressure steam available at 40bar and 400°C is used, as shown in the following figure. The entire system is well insulated, asshown. It is undesirable for the steam to condense in the heat exchanger tubes. Assume thepressure of each stream stays constant as it flows through the heat exchangeWhat is the minimum volumetric flow rate, in m3 /s, required of the inlet steam to keep it from condensing at the exit?Saturated steam at 40∘C is to be cooled to saturated liquid in a condenser. The mass flow rate of the steam is 17.3 kg/s . Assume no pressure loss. a)Determine the rate of heat transfer. Q = ? MW
- Atmospheric air at 40°C dbt and 55% RH is passed over a cooling coll at the rate of 600 m/mint. At exit from coil the air is saturated and its temperature is 8°C. The condensate also leaves at 8°C. Determine the amount of condensate leaving coll per minute and refrigeration in kW. The specific heat of superheated steam may be assumed to be 1.88 kJ/kg-K. Solve the problem without psychromatic chart.An ice chest is constructed of Styrofoam [k=0.033 W/(m.k)] with inside dimension of 25 by 40 by 100 cm. The wall thickness is 5.0 cm. The outside of the chest is exposed to air at 25 oC with h=10 W/m2oC. If the chest is completely filled with ice, calculate the time for the ice to completely melt. State your assumptions. The heat of fusion is 330 KJ/kg. Heat transfer through the wall joints maybe neglected.The following data for steam con denser: Steam condensed =50000 kg/h; Temperature of steam in condenser = 40 oC; Dryness of steamentering into condenser=0.85; The air leakage in the condenser = 150 kg/h;Temperature of the condensate = 35oC. Find: (1) The air leakage pressure. (2)Quantity of cooling water passed through the condenser per hour if the rise incooling water temperature is limited to 10oC
- 2 m^3/min of a light oil are to be heated from 20C to 100C (with zero vaporization) in an exchanger using 250 kPa steam of 90% quality. The heat losses to the surrounding air have been estimated to be 5% of the heat transferred from the condensing steam to the oil. If the steam condensate leaves at its saturation point, what mass of steam perhour will be used in the exchanger? For light oil, Specific gravity= 0.88Specific heat= 2.00 kJ/kg-KFor steam at 250 kPa,Saturated liquid: hf= 535.49 kJ/kgvf=0.001067 m^3/kgSaturated vapor: hg= 2716.8 kJ/kgvg= 0.7188 m^3/kgA fuel oil of 20 deg API (density = 934 kg/m3) is to be heated in a heater and has the following properties: Quantity of oil to be heated 3000L/hr Temp. of oil entering tubes 21C Temp. of oil leaving tubes 95C Heating fluid, steam enters at 105C and leaves as condensate at 85C. Assume specific heat of oil to be 2.093 kJ/kg-K. Take the over-all coefficient of heat transfer is as 140 W/m2-C. What is the rate of heat transfer to the oil? Group of answer choices 120.5 kW 150.2 kW 152.0 kW 125.0 kWDetermine the amount of heat removed from 1.5 kg of bologna (sausage)when cooled from 24C to -7C. Assume MC of 59% and at -7C, 22% won’t be frozen.
- Thermal conductivity is lower for (a) wood (b) air (c) water at 100°C (d)steam at 1 barWater vapor with a flow rate of 20000 kg / h enters the condenser of a power plant at a pressure of 20 kPa and 95% dryness. In the condenser, there is heat transfer to the river water flowing through the pipes. The temperature rise of the river water is limited to 10 ° C to prevent thermal pollution. Since the state of the water at the condenser outlet is a saturated liquid at 20 kPa pressure, what is the flow rate of the cooling water?Steam enters the condenser of a steam power plant at a flow rate of 18000 kg/h, a degree of dryness of 0.86 and a pressure of 15 kPa, leaving the condenser as a saturated liquid at the same pressure.A nearby river water is used for the cooling of the condenser.Calculate the water flow rate of the cooler if the water of the river can be heated up to 10°C in order to avoid thermal pollution. (Cp,su=4,18 kj/kgK) (Note: the potential energy change is negligible.)