Condenser Selection
In condenser selection in the refrigeration system, the heat taken by the refrigerant from the evaporator and the heat added during the compression process is removed from the system in the condenser. Thus, the refrigerant is liquefied, pressurized, and expanded again. It is brought to a state to receive heat from the evaporator.
It can be thought that the heat exchange in the condenser occurs in 3 stages,
• Taking the temperature
• Condensation of the refrigerant
• Extreme cooling.
Depending on the condenser design, supercooling can take 0-10% of the condenser area.
To allocate 5% of the condenser area to this process in order to take the superheat
Depending on these three different types of heat transfer, the heat transfer coefficients in the condenser will also be different between
a lower heat transfer coefficient will be present against the excess of the temperature range, but during supercooling, on the contrary, the temperature range is smaller and the heat transfer coefficient is higher. During condensation, both values are between lower and upper levels. In the experiments carried out, against the increase in the heat transfer coefficient, the temperature decreasing the difference (or vice versa) gives approximately the same multiplication result. It is possible to use the mean of the values. The simplicity it provides in the calculation is also Considering the calculation of condensers, a single heat transfer coefficient and a single average temperature range values apply.
In general, there are 3 different types of condensers;
• Water-cooled condensers
• Air-cooled condensers
• Evaporative (Air-Water) condensers.
In practice, which of these will be used will be determined by an economic analysis. In this analysis, installed4 and operating costs should be studied together. On the other hand, it is certain that the condensation temperature will be lower in water-cooled and evaporative condensers, and therefore the thermodynamic efficiency of the cooling cycle will be higher, so this should be taken into account in the analysis to be made
Air Cooled Condenser