2.3 Simulations in TRNSYS
Thermal performance of the hybrid panels was evaluated using building energy simulation software TRNSYS. This software allows calculating hour by hour desired quantities of a modeled system. Software works with pre- defined device components, while the model itself was inserted using programmed EXCEL application. Climate data used for the software calculation represent typical meteorological year [TMY] commonly used in simulation software; in this case we used data for Brno (Central Europe). A connection diagram of the hybrid panels in switch mode between night and day operation is shown in Figure 4. The cooled water from the panels flows directly to activated concrete TACC core and reduces thermal load of the officespacesduringnightime,butduringdaytimewatermay beheatedandusedforpre-heatingofwaterfor restaurants. Primary panel circuit transfers the heat through heat exchanger surfaces, which preheat the cold water pipeline of 14 °C. Than the pre-heated water flows into a storage tank, where this water is heated on desired temperature by gas boiler. Amount of the hot water consumption is presumed for 2 restaurant facilities located in lower floors of the building. These canteens manage to serve food for up to 3000 diners per day. The restaurant facilities are in service only during weekdays. Chart of predicted hot water demands is shown in Fig 5. This study considers only model with daytime operation of the facilities. Pre cooling of the primary circuit water due toradiationagainstthenightskyisnotconsidered. Thiswouldfurtherincreasetheefficiencyofthepanels.