Efficiency of air cooled heat exchanger

Forced flow air–cooled heat exchangers (ACHEs) as found in the petrol-chemical, process and power industries use fans arranged in single or multiple fan rows to force air over finned tube bundles. Any flow disturbances experienced at the inlets of these fans tend to reduce the effectiveness of the ACHE.
The cost of the air-cooled condenser in a typical binary geothermal power plant represents about 20 to 35% of the total plant cost, improving the ACHE will make it possible to design them smaller and to make more energy with exiting ones.
Conclusions were based on information of air movement, which is scarce in open literature, computer simulation, which was found on the net, workers interviews and personal experience.
Since the supply and control of atmospheric air in an industrial environment is difficult to predict the author decided to conduct experiments to try and focus the cause and solution of the problem. During the months January-April the author set some experiments in a geothermal power plant in the USA.
By the little literature and test results the author identified that there is a flow problem in the fans and it is affected by wind speed and direction.
This paper will concentrate of several solutions:
Wind walls constructed in different ways.
Diffuser.
The preferred solution is a diffuser on the exhaust of the fan to decrease the pressure drop the fan needs to overcome.
This project shows that a diffuser will increase fan efficiency and there for plant power increase of 3.78%, increase of 213,041$ income per year.
Total investment in project is 68,298$.

Return time is 4 months.