Can you explain the process of this refrigeration and cryogenic plant for liquid oxygen production?
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- Classify internal combustion engines taking various factors into consideration. What is athermodynamic temperature scale or absolute temperature scale? Explain theestablishment of such a scale.Water is to be boiled at atmospheric pressure in a polished copper pan by means of an electric heater. The diameter of the pan is 0.51 m and is kept at 111 deg C. What is the power required to boil the water? Tsat = 100°C; Properties of water at 100°C: Density, ρl= 961 kg/m3; Kinematic viscosity, ν = 0.293x10-6 m2/s; Prandtl Number, Pr = 1.740; Specific heat, Cpl = 4216 J/kg.K; Dynamic viscosity, μ = ρ × ν = 961 × 0.293 × 10-6 = 281.57 x10-6 Ns/m2; hfg = 2256.9 kJ/kg; ρv = 0.597 kg/m3; σ = 0.0588 N/m; Csf=0.013; n=1; Select one: a. 25964.0356 b. 52997.1101 c. 49373.4011 d. 38911.7986Water is to be boiled at atmospheric pressure in a polished copper pan by means of an electric heater. The diameter of the pan is 0.48 m and is kept at 108 deg C. What is the power required to boil the water? Tsat 100°C; Properties of water at 100°C: Density. pl= 961 kg/m3; Kinematic viscosity, v 0.293x10-6 m2/s: Prandti Number. Pr 1.740; Specific heat, Cpl = 4216 J/kg.K; Dynamic viscosity, u = p x v = 961 x 0.293 x 10-6 = 281.57 x10-6 Ns/m2; hfg = 2256.9 k/kg; pv = 0.597 kg/m3; a = 0.0588 N/m; Csf=0.013; n=1:
- Water at atmospheric pressure is boiled in a container using a horizontal 8 mm electric wire (ε=0.9) whose temperature is maintained by an electric current at 250oC. Estimate the boiling heat transfer coefficient between the water and the wire surface. Properties of Water, liquid: ρl = 957.9 kg/m3, hfg = 2257 kJ/kg, vapor: ρv = 4.8 kg/m3, Cp,v = 2560 J/kg.K, μv = 14.85*10-6 N.s/m2, kv=0.0331 W/mK. Select one: a. 247 W/m2K b. 440 W/m2K c. 90.7 W/m2K d. 710 W/m2KA horizontal pipe of 100-mm-diamter and 1 m long with a surface temperature of 94 ℃ is used to condense saturated steam at 1 atm. Determine the heat transfer rate for the condensation process. Properties of Water, vapor (1 atm): Tsat = 100℃, ρv = 0.596 kg/m3, hfg = 2257 kJ/kg;Water, liquid (Tf = 370K): ρl = 960.6 kg/m3, Cpl = 4214 J/kg.K, μl = 289*10^-6 N.s/m2, kl = 0.679 W/m.K. Select one: a. 28567 W b. 18254 W c. 19076 W d. 22552 WA horizontal pipe of 125-mm-diamter and 1 m long with a surface temperature of 95 ℃ is used to condense saturated steam at 1 atm. Determine the heat transfer rate for the condensation process. Properties of Water, vapor (1 atm): Tsat = 100℃, ρv = 0.596 kg/m3, hfg = 2257 kJ/kg; Water, liquid (Tf = 370K): ρl = 960.6 kg/m3, Cpl = 4214 J/kg.K, μl = 289*10^-6 N.s/m2, kl = 0.679 W/m.K.
- 5400 kg of steam is produced per hour at a pressure of 750 kN/m2 in a boiler when feed water at 41.5 C. The dryness fraction of steam at exit is 0.98. The amount of coal burnt per hour is 670 kg of calorific value 31000 kJ/kg. Determine the boiler efficiency and equivalent evaporation.Water is boiled at atmospheric pressure in a square (0.2 m x 0.2 m) pan placed on top of a heating unit. Pan is made of polished copper and the surface tension of liquid-vapor interaction is 0.06 N/m. The coefficient Ccr is 0.15. What should be the maximum bottom surface temperature of the pan for safe operation? Properties of water: ρl=960 kg/m3 ρv=0.6 kg/m3 μl=0.3x10-3 kg/ms cpl=4200 J/kgK Prl=2 hfg=2257x103 J/kgThe normal boiling point of copper is 2845 K and its molar enthalpy of vvaporization is 300.3 kj/mol. What is the change in the entropy in the system when 127 g of copper vapor condenses to liquid at the normal boiling point? MW=63.5
- 2. Humid air at 35o C and a pressure of 1 atm and with 98% relative humidity enters a condenser in which the temperature is lowered isobarically (pressure is constant) to 15o C. Part of the water condenses and coexists with the remaining air. The remaining air leaves the condenser flowing through a 20-cm diameter duct at a velocity of 10 m/s. Calculate the rate (moles water/s) at which water condenses.A 150,000 kg of coalsupplied to two boilers. One has acapacity of 350 kg/hr and the otherboiler has a capacity of 100 kg/hr.Air fuel ratio of boilers are 15 and10 respectively with an ash loss of11% to both. The pressure andtemperature of the gas as it directsto chimney is 98kpa and 130°C.Use molecular weight of gas of30kg/kgmol. Determine thediameter of the chimney of themost consumed fuel if the draftpressure is 2.79cm H2O.Calculate delta S when 1 mole of supercooled water at –10oC and 100 kPa is converted into ice at -10oC and 100 kPa. The molar heat capacity at constant pressure (Cm,P) of ice is 37.7 J K-1 mol- 1, and that of supercooled water is 76.1 J K-1 mol-1. The enthalpy of freezing of water is -6004 J mol-1. final answer: -20.54 J K-1