Winter operating modes

Figure 9.4 Operating regions for the winter operating modes for ice prevention [1],...

Power Geneiiition and Refrigeration Cycles 171 Winter Operation (Heating Mode)... 

A gas turbine CHP. scheme which operates at Liverpool University, UK, consists of a Centrax 4 MW (nominal) gas turbine with an overall efficiency of about 0.27, exhausting to a WHB. The plant meets a major part of the University s heat load of about 7 MW on a mild winter s day. Supplementary firing of the WHB (to about 15 MW) is possible on a cold day. Provision is al.so made for by-passing the WHB when the heat load is light, in spring and autumn,. so that the plant can operate very flexibly, in three modes viz., power only, recuperative and supplementary firing. 

This furnace will also provide auxiliary heat for domestic hot water when solar energy cannot provide this function. At times, while on winter mode operation, there will be days when cooling may be required. When this... 

Power unit now operates in stable mode on the rated power level. Only in the winter, when heat supply to the consumers increases, some decrease of electricity production is observed. 

The truly exceptional winter conditions which affected some parts of Europe in December 2010 - with many historic records broken as regards snowfall and temperatures - tested aviation and other transport modes alike. Throughout the difficulties, Europe s airpOTts ensured that over 85% of air traffic was unaffected. Passenger safety was upheld at all times and no accidents occurred despite extremely challenging operating conditirais. ... 

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