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- 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. 38911.7986In a reservoir system with a very large accumulation volume for the ideal fluid (water),a) Since the diameter of the ABCDEF outlet pipe is D = 20 cm, the flow rate through the pipe,b) Calculate the velocity, velocity height, relative pressure and pressure heights in the ABCDEF outlet pipe.c) Draw the relative energy and piezometer lines of the system.d) If the relative evaporation pressure of water is pv = -98.5 kPa, what can be z maximum?e) Determine how much the diameter of the outlet pipe can be reduced at most without causing cavitation, with the relative evaporation pressure of water pv = -98.5 Pa and h = 6 m.f) Calculate the critical velocity value for cavitation.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.
- 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 0.48 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: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.Testing of a stoker fired boiler revealed that, during a period when 2064 kg of 3100 kcal coal were bund, refuse accumulated in the ashpit to the extent of 225 kg, although the coal as fired contain only 10.0 % ash by analysis. Determine the grate efliciency of this stoker (No fly-ash).
- 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°CFind the enthalpy change for vaporizing 1 kg of water at 125°C and 232.1 kpa. What is the latent heat of vaporization of water at this condition. (Gpt/Ai wrong ans not allowed)Consider diffusion of hydrogen through a poly(dimethyl siloxane) (PDMSO) sheet 20 mm thick. If the permeability coefficient at 350 K is 1.31 x 10-10 [(cm STP)(cm)/(cm2-s- Pa)], compute the diffusion flux [(cm STP)/(cm2-s)) at 500 K. The hydrogen pressures at the two faces are 10 kPa and 1 kPa, which are maintained constant. Hint: Pw is the temperature independent coefficient i.e. it's the same for all temperatures. Use PM = PMo (- Qp / RT), Qp = 13.7 kJ/mol and R = 8.31 J/mol-K
- 7. A pan made of stainless steel contains water at atmospheric pressure. The pan diameter is 25 cm and its surface is mechanically polished. The pan is now heated while its surface is maintained at 116 C. Find the surface heat flux, the boil off (evaporation) rate, and the peak heat fluxWill the largest condensation heat transfer coefficient always be obtained for a horizontal finned tube with the maximum possible fpm?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/kg