22 May 2008


The present study aims to develop a simple simulation method for an ammonia
water cooled chiller. This method is based on the thermodynamic principals and heat transfer
fundamental laws. The performances of the chiller have been looked at as function of the
water temperatures at the entry of the evaporator and the condenser. These temperatures
are considered as the main parameters of the simulation. The chiller uses ammonia, a
natural environment friendly refrigerant, under study to replace R22 for these applications.
The calculation of thermodynamic properties of the refrigerant, necessary for the simulation,
is carried out by simple and reliable local equations of state. The results show that the COP
of the system increase slightly when increasing the evaporator water inlet temperature and
decrease when increasing the condenser inlet water temperature.