on 7 4 10practical exercise 10 energy balance in the steam generator r

Question

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7.4.10Practical exercise 10: Energy balance in the steam generator
Ref. unit TARCITARB
7.4.10.1 Objective
In the previous practical exercise we have determined the capacity of the
gerator in the steam production. The objective of this practice is to obtain the
efficiency of the same one and to quantify the energy losses that take place.
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Date: Marzo 2014
7.4.10.2 Practical procedure
The procedure is identical the one described in the previous experiment
and both practices can be carried out simultaneously. Once we determine the points
in the psychometric chart at the inlet, point A, and after injecting the steam, point B
an enthalpy increment of the air takes place that can be obtained from the
psychometric chart. That is to say:
60
Where, corresponds to the enthalpy of water from the tank at a reference
temperature of 20°C. Under these conditions, the enthalpy of the water is hu-84
kkg. The difference between the electric power given to the generator and the
enthalpy increment acquired by the air is due to heat losses that take place in the
walls of the evaporator as well as in other elements. For a fixed airflow, the
following table is completed
316.224.4
Power
90
Pg: 39/47
100