A method for the economical optimisation of the design temperatures and the connecting flows of a cooling system.

The planning parameters of a cooling system for ventilation, for example the vaporization andcondensing temperatures, heat capacity flow rates, design temperatures and designtemperature differences have a strong influence on the investment and operating costs.The target of this research is to find economically optimized design parameters byminimizing the present value of investment and the operating costs of the cooling system. Thecooling system may have several series-connected heat exchangers on the vaporization andcondensing sides of the cooling machine.When the optimization is carried out, such factors as the price of electricity, maintenancecosts, operating time, interest rate, annual running time, the coefficient of performance,marginal costs of heat transfer surface areas and the overall heat transfer coefficients of thevaporizer, the condenser and the other heat exchangers which are connected to the samesystem, are taken into account.This new method is useful for the economical optimization of the design parameters ofventilation and other cooling systems.