By establishing thermodynamic model and system performance evaluation system for waste heat utilization system of cooling towers' attachment

the selecting principle of organic fluids was investigated

and the design theory of the heat pipe heat exchangers was studied.Taking the condition with low temperature heat source temperature of 85℃

the flow rate of 100t/h

the cooling water temperature of 25℃and the pentane as the fluid as the example

corresponding calculation was carried out.The results show that

the heat efficiency of the system was larger than 13%;the annual power generation was 7.0×105 kWh if the working time is 7.0×103 h per year;assuming the electricity price is 0.5yuan/(kW·h)

the annual economic benefit can reach up to 3.5×105 yuan;at the same time

the CO2 emission can be reduced by 650 t.