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In order to study the effectiveness of multi-fluid type heat exchangers, where more than
two fluids are involved at the same time, three-fluid, four-fluid and double two-fluid heat
exchangers have been studied using various methods.
Using general definition of maximum heat transfer rate, which can be considered as a
single definition of Qmax, the single effectiveness of multi-fluid heat exchangers can be
developed. The maximum heat transfer rate （Qmax） depends on heat capacity rate of
each fluid and theirs initial temperatures. It is found that effectiveness is strongly
depended on the variables such as flow arrangement, initial temperature, number of heat
transfer unit, and fluid properties as well.
The optimum heat exchanger and flow arrangement in all cases is determinate by
numerical analysis using and comparing different mathematical methods, like LMTD
method, NTU method, Runge-Kutta Method or Cranck Nicholson method.
It is seen that the best heat exchanger depends on variables such as ratios of initial
medium temperatures, length, and fluid properties as well.
In this paper, only plate heat exchangers are studied, leaving apart tubular heat
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