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Khono

Khono

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INSTANT ANSWER

you are designing a process in which hexflourobenzene is used as a solvent at T= 100 degrees celcius and P sat =760mm Hg as part of your safety analysis you need to ensure that hexfluorobenzene will not boil at process conditions 1. find the normal boiling point of flourabenzene 2. briefly explain if it safe to operate at the given process conditions T=100 degrees celcius and Psat= 760 mmHg

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A batch removes water from a solid at a rate of 50 kg/h during the constant rate period. The critical moisture content is 0.3kg H2O /kg dry solid . The equilibrium moisture content of the material is 0.02 kg H2O/ kg dry solid. The dryer is initially charged with 350kg of material which contains 60% dry material and the remainder is moisture. The final product contains 0.05kg H2O/ kg dry solid and the falling rate period can be represented by a straight line 1. Draw a schematic that depicts the process 2. Determine the total drying time to produce the product

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Air flows at 85 Β°C through a copper pipe with an internal diameter of 6 cm and a thickness of 0.4 cm, where it is externally heated by water at 130 Β°C. On the external surfaces of the pipe, a scale with a thickness of 0.2 cm is formed. Take the thermal conductivity of the copper pipe as π‘˜π‘˜π‘π‘π‘π‘π‘π‘π‘π‘π‘π‘π‘π‘ = 384 π‘Šπ‘Š/π‘šπ‘š.𝐾𝐾 and of the scale as π‘˜π‘˜π‘ π‘ π‘ π‘ π‘ π‘ π‘ π‘ π‘ π‘  = 1.75 π‘Šπ‘Š/π‘šπ‘š.𝐾𝐾 and the convective coefficient of the inside surface as β„Žπ‘–π‘– = 221 π‘Šπ‘Š/π‘šπ‘š2.𝐾𝐾 and outside surface as β„Žπ‘œπ‘œ = 3605 π‘Šπ‘Š/π‘šπ‘š2.𝐾𝐾. Calculate the overall heat transfer coefficient on the outside area basis, the water to air heat transfer and the temperature drop across the scale deposit. Figure 1 below shows a schematic representation of the copper pipe

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ANSWERED

Penny Riley verified

Numerade educator

question 5 an equimolar counter diffusion takes place in an oxygen-hydrogen gas combination at steady steady state at a total pressure of 105 kPa and 25 degrees celsius. the partial pressures of oxygen at two planes that are 0.01 m apart and perpendicular to the direction of diffusion are 20 kPa and 10 kPa, respectively, whereas the mass diffusion flow of oxygen in the mixture is 1.6 x10^-5 kmol/m^2/s. Calculate the molecular diffusivity of the system. N.B. first show how you derive the equation and calculate the answer

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question 4 air flows at 85 degrees celsius through a copper pipe with an internal diameter of 6 cm and a thickness of 0.4 cm , where it is externally heated by water at 130 degrees celsius . on the external surfaces of the pipe , a scale with a thickness of 0.2 cm is formed. take the thermal conductivity of the copper pipe as 384 W/m.K and of scale as 1.75 W/m.K and the connective coefficient of the inside surface as 221 W/m^2.K and outside surface as 3605 W/m^2.K. Calculate the overall heat transfer coefficient on the outside area basis, the water to air heat transfer and the temperature drop across the scale deposit

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ANSWERED

Penny Riley verified

Numerade educator

question 3 calculate the heat loss of a horizontal steam pipe with an outside diameter of 40 mm and temperature of 738 K, if the surrounding air temperature is given as 623 K. Take the emissivity of the pipe as 0.9 1. Radiation 2.Convection

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Question 2 a room consists of interior surface made of wood that is 0.013 m in thickness, the middle surface is corkboard that is 0.1016 m in thickness and external surface is concrete with a thickness of of 0.0767 m. The exterior surface of the concrete has a temperature of 287.3 K and inside the room the wall surface has a temperature of 245.3 K. The thermal conductivity of the wood is 0.151 W/m.K, for corkboard is 0.0433W/m.K and for concrete is 0.762 W/m.K, respectively. calculate the temperature at the interface between the wood and the corkboard, as well as heat loss (W) for a surface area of 1 m^2

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the thermal conductivity of a door with a thickness of 8 mm is 0.78 W/M degrees celsius. the door measures 1500mm width and 800mm in height. if the indoor temperature is stays constant at 20 degrees celsius and the outside temperature is -10 degrees celsius , calculate the steady rate of heat transfer through the door and the temperature of its inner surface throughout the day. the heat transfer coefficient of the inner surface is 10 W/m^2 degrees celsius and 40 W/m^2 degrees celsius for the outer surface. consider the thermal conductivity to be constant and the heat transfer through the door to be steady and one dimensional

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ANSWERED

Hubert Agamasu verified

Numerade educator

A steady flow chemical process operating at temperature 370,37 degrees celsius comprises of air. The temperature is then raised to 700 degrees celsius. calculate the heat required to raise the temperure of 2 mol air. consider air to be an ideal gas

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ANSWERED

Penny Riley verified

Numerade educator

Question 5 A stream of helium and nitrogen at flow rates of 0.4kg/s and 1.7kg/s respectively, are mixed in a steady flow process. assume adiabatic mixing to calculate the rate of entropy increase if the gas are assumed to be ideal

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