Numerical simulation of a new district cooling system in cogeneration plants

AbstractIn allusion to the problem that the superheated steam need to be cooled down by a temperature and pressure reduction device if its pressure exceeds the requirement of a absorption refrigerator, based on the cascaded utilization of energy and the theories of compression refrigeration and absorption refrigeration, a new type of district cooling system driven by surplus steam is introduced. Calculation model for the new combined cycle system is developed. The thermodynamic calculations of the absorption cooling program and combined cycle cooling program are processed upon a practical example. The amounts of surplus steam consumption are obtained and the effects of chilled water temperature, cooling water temperature and transfer efficiency of the industrial turbine are studied and analyzed. The result shows, compared to absorption systems, combined cycle systems have the advantage in energy conservation and steam-consumption saving. This research provides technical support for district cooling in a cogeneration plant