on

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.

885288

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