اعلانات هامة

The cooling towers are a type of direct contact heat exchangers that widely used in a variety heat transfer applications, for example power stations, petroleum and chemical industries, industrial processes, cooling and air conditioning.

The research aims to study both theoretical and experimental of heat and mass transfer phenomenon between water and air in the cooling tower, and the relationship between the cooling load and both of the cooling range and the cooling approach; and the influence of relative humidity on the cooling tower performance.

The research presents also a new data for the heat and mass transfer in the cooling tower, which contains ten layers of the charge. We have been verified experimentally the equations of heat and mass transfer.

We note from the results that there is a difference in the cooling range and the cooling approach by increasing the cooling load and the influence of the relative humidity on the performance of the cooling tower. This is due to the increasing of the evaporation rate by the change in steam pressure on the surface and in the air stream. If the dry temperature increases, the saturation pressure of water increases and humidity must be decreases. If the wet temperature increases, the heat transfer must increases by conduction and convection when dry temperature increases, and the evaporation rate will increase.

Keywords: Cooling towers, Heat and mass transfer, Refrigeration machines.

تعتبر أبراج التبريد أحد أشكال المبادلات الحرارية بالتماس المباشر وتستخدم بشكل واسع، في تطبيقات متنوعة لنقل الحرارة، على سبيل المثال في محطات توليد الطاقة، الصناعات الكيميائية والنفطية، العمليات الصناعية، وعمليات التبريد وتكييف الهواء.