About

Online Dynamic HVAC Room Simulator

• The simulation is focused on a single room and day simulation.
• The solar culimination is determined by the time zone, longitude correction and Equation of time.
• Daylight Saving Time (Summertime) applies on dates defined by the European Union, if enabled.
• Ambient outdoor tempratures and cloud cover can be applied upon the Clear Sky model.
• It is possible to make use of local Weather Data (Typical Meteorological Years) in the simulation.
• Diurnal Cycle estimation for outdoor temperature, aligned with the solar orbit.
• Thermal accumulation by the thermal mass of the inner layer is incorporated (SWM ISSO 32), but no exact structural structure build-up.
• The ratio of influence of the the floor's working thermal mass and surface temperature and the radiant power will decrease/increase equally, depending on the interia of the screed.
• An uniformal thermal mass is considered per surface, and different internal surface resistances (horizontal, up- and downwards) are taken into account accoring to the NTA 8800.
• For radiation temperature, glass surface temperatures and closed surfaces are taken into account.
• The density and specific heat capacity of the indoor humid air is dynamically calculated with 50% relative humidity and 101325Pa (sea-level) air pressure.
• The simulation is thermal calculating without the effect of condensation. Therefore the actual HVAC capacities can differ from the simulation results.
• For installations, a vertical temperature gradient of 0.5K per meter, is taken into account. (ΔT is different for floor/ceiling).
• The room temperature is moddeled at 1.5m height (Mounting height room controller)
• Sensible heat of the human metabolism does not depend on the room temperature.
• Infiltration is calculated using ISSO 53, table 4.5.
• An interval of 5 minutes is applied to reduce simulation time and to ensure a smooth user experience.
• Night-sky radiation and external heat up by radiation are not incorporated.
• Comfort Temperature is calculated based on surface temperatures and changing floor/ceiling temperatures because of integrated heating and cooling is incorporated. Sepearate heaters/radiators surfaces are not taken into account because the surface is not available.