A steam stripper is used to help removing wallpapers. It comprises of a tank of water with an electrical heating element. To generate steam, from which a long rubber tube conveys the steam to the head which contact with the wallpaper to be removed. (i) The power rating of the electrical heating element is 2 KW, and the tank holds about 3 liters of water. Estimate the time it would take from switching the power on to steam to be generated. (ii) Once steam has started to be produced, estimate how long you could work continuously before having to refill the tank. Assume that all water initially in the tank can be evaporated into steam. Also, neglect any heat loss from the tank. Data : Room Temperature 20 oC Heat capacity of water, Cp 4.19 KJ kg-1 K -1 Latent heat of vaporization of water at 100 oC, hfg 2257 KJ kg-1 (iii) Stream is to be condensed in the condenser of a steam power plant at a temperature of 50 oC with cooling water from a nearby lake which enters the tubes of the condenser at 18 oC at a rate of 101 Kg/s and leaves at 27 oC. Determine the rate of condensation of the steam in the condense
1- A steam stripper is used to help removing wallpapers. It comprises of a tank of water
with an electrical heating element. To generate steam, from which a long rubber tube
conveys the steam to the head which contact with the wallpaper to be removed.
(i) The power rating of the electrical heating element is 2 KW, and the tank holds about
3 liters of water. Estimate the time it would take from switching the power on to
steam to be generated.
(ii) Once steam has started to be produced, estimate how long you could work
continuously before having to refill the tank. Assume that all water initially in the
tank can be evaporated into steam. Also, neglect any heat loss from the tank.
Data :
Room Temperature 20 oC
Heat capacity of water, Cp 4.19 KJ kg-1 K
-1
Latent heat of vaporization of water at 100 oC, hfg 2257 KJ kg-1
(iii) Stream is to be condensed in the condenser of a steam power plant at a
temperature of 50 oC with cooling water from a nearby lake which enters the tubes
of the condenser at 18 oC at a rate of 101 Kg/s and leaves at 27 oC.
Determine the rate of condensation of the steam in the condenser.
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