ABSTRACT
Equation (1)is plotted in Fig. 1, which can be used to calculate the cooling water quantity for a particular duty of the condenser, based on the total ann ual costs.
Optimum cooling water velocity is selected based on the initial cost of the condenser and pumping power costs during the service life of the equipment. This can be written as
C T = total cost = (initial cost/nr') + (pumping cost/kW . h) (annual h)
(years of service)
where Q = heat duty C, = initial cost/m? ~Tm = LMTD W = cooling water flow., m 3/s ~p = pressure drop through tubes, kg/rrr' Co = operating cost/kw h Y = years of operation 102 = conversion factor, kgm/kW . s E = pump efficiency
C r = QC, _1_ + nDNLJpCo8Y V3 K~Tm IV 2gl02E (5)
C,E 3 3JC8Y = V (6)
