Abstract
It is desirable that proper cost accounting of steam and electric power generated at a back pressure power plant in chemical industry should be made mechanically. This is, however, very difficult from economic and thermodynamic reasons.
In this paper, various methods for this purpose are described.
1. When price per unit calorie is considered to be equal both for steam and electric power: cf. Fig. 1 & Eq. (1)
By this method, steam is too expensive as compared with electric power.
2. When price of unit availability N is considered to be equal both for steam and electric power: cf. Eqs. (3a), (4) & (5)
By this method, electric power is too expensive as compared with steam.
3. When price of electric power of the plant is assumed to be equal to that of a condenser steam power plant: cf. Fig. 3, Eqs. (6) & (7)
By this method, electric power is too expensive as compared with steam.
4. When price of steam of the plant is assumed to be equal to that of an ordinary low pressure boiler plant: cf. Eqs. (8) & (9)
By this method, steam is too expensive as compared with electric power.
Prices of Electric Power and Exhausted Steam a Computed according to the Above-Mentioned Methods
