12th International Symposium on District Heating and Cooling

The <strong>12th</strong> <strong>International</strong> <strong>Symposium</strong> on District Heating and Cooling,September 5 th to September 7 th , 2010, Tallinn, EstoniaIn following Table 1 and Figure 2 the relations of theSW parameter can be found.cooling network with total capacity of 19 MW. Project isinteresting to public buildings which have lower balancetemperature and due to that higher cooling demand.Study was carried out to construct: Cooling plant with 4 water chillers; Sea water pumping station (free cooling, precooling)with 5 heat exchangers; District cooling network to customers.In Tallinn costal area is 21 potential customers whosecooling demand is app. 19,2 MW. Simultaneous factor0,85 is assumed. Cooling demand will be covered withwater chillers and SW free cooling. Calculations of 21public buildings information are presented in Table 2.Cooling load is calculated 120 W/m 2 (building no 17cooling load 60 W/m 2 ). In calculations was notconsidered residential area cooling load due to differentusage profile compared to public areas.Fig. 2 Temperature and SW depth relationTab. 1. SW parametersDist.fromcoast, mDepth(sea),mAnnualaver.temp, o CMintemp,o CFrom previous studies has been found that coolingdemand exceeds significantly when the outdoortemperature exceeds 16 ºC (see Figure 3).Fig. 3 Ambient temperature and cooling power relationCASE STUDY – TALLINN COSTAL AREAMaxtemp,o C500 20 7,5-8,5 2,5 17,51500 25 5,5-6,5 1,5 173200 30 4-5 1 14-164000 35 3,5-4