USING OF REFRIGERATING SYSTEMS FOR WATERCONDENSING OUT FROM MOIST AIR

Abstract

The present study is dealing with the extraction of water

, ... 4 1

from atmospheric moist air:in which a theoretical analysis

c<,. ,..,J is made to study the optimum values of condensate

recovery (A.).

A mathematical model, based on the thermodynamics of simple vapour compression refrigeration cycle is used to serve all the cases studied in this work, using refrigerant (Rl2) to cool the atmospheric moist air in order to condensate the moisture from it.

The cases studied in this work are divided into three cases. In Case I the atmospheric moist air flows through the cold evaporator in which the temperature is reduced below air dew point, the condensation of moisture occurs and the outlet air drown to atmosphere, and/or the cooled outlet air flows from the evaporator to cool the condenser in Case II while in Case III this cooled air is used to cool the inlet atmospheric moist air without mixing them.

Many parameters have affected the process of condensation of moisture such as moist air state (dry bulb temperature ( ta ), relative humidity (R.H.)), evaporator temperature ( te ), condenser temperature (tc) and the design of the refrigeration system specially the evaporator and the condenser ( i.e. temperature difference between refrigerant and air in both of them ( MaJ).

To make this study more useful for the MIDDLE EAST AREA and GULF COUNTRIES too, the range of moist air temperature (t.) has been chosen between 20°C up to 50°C and the relative humidity (R.H.) between 10% up to 90%.