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Abstract
The objective of the present thesis is to make hydraulic analysis and economical assessment to district cooling system. the hydraulic analysis was designed by using engineering program (bentley watergems V8i) which depended on representation of a given lengths and diameters and required flow for each building to establish the required cooling had been found that there is some problems concerning water flow rate speed inside pipes moreover, rising of pressure beyond upper limit of the allowed values of pressure. According to that modifications in network design were done to avoid this obstacle. While from the economical aspect an economical study performed and comparison were done among district cooling systems and central cooling units from side and chillers work by natural gas and others work by electricity power from the other side (the natural gas was used in Egypt because of its relative cheapness ) from this economical study we discovered that district cooling system operating on natural gas better economically from the one that operating on electricity power whereas the central cooling system came in the bottom of list if it compared with district cooling system. This study found that application of this technology will increase when there is high thermal loads for area unit and that occur in high buildings