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1 a ) During the Spray dryer demonstration, 3 4 . 6 gram of fresh egg white was pumped into the spray dryer, and at
a During the Spray dryer demonstration, gram of fresh egg white was pumped into the spray dryer, and at the end of the drying process, gram of dried egg white powder was collected. Calculate the solids weight fraction Ws of the initial fresh egg white before drying. Neglect the amount that is not collected. Assume the initial and final moisture contents of egg white to be and wet basis respectively. b If the change in enthalpy of the fresh egg in a during the warmup period is kJkg Calculate the heat gain Qegg. use equation below c Determine the spray dryer thermal efficiency E and the heat losses L in given that: Latent heat of vaporization of water during drying kJkg total drying time min, and Aspirator dial set A use the equation below d Determine the spray dryer thermal efficiency E and the heat losses L in given that: Latent heat of vaporization of water during drying kJkg total drying time min, and Aspirator dial set A use the equation below
a Determine and
Note:
b Determine and
Note:
c Use the psychrometric chart to determine the outlet wet bulb temperature Note: and and are on the same enthalpy line.
The egg is assumed to be warmed up from to before evaporation occurs.
d Evaluate mass of egg white pumped to the drier
where: is heat gain by total egg in warm up period
is the enthalpy of liquid water at the wet bulb temperature of outlet air stream and atm pressure use steam table
is the enthalpy of liquid water at and atm pressure use steam table is the initial moisture content of the egg white in wet basis e g
is heat utilized to evaporate water
is the latent heat of evaporation of water during drying.
mass of water evaporated
is heat gained by total egg during drying process is the mass of the dried egg white powder collected egg powder is the specific heat capacity of egg white powder
e Determine the amount of heat supplied:
air used during drying
Note: air flow rate
where: aspirator dial set
Mass of air air flow rate
f Determine the thermal efficiency E and the heat losses L in value
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