SIMULATION GETS REAL
Software companies are increasingly partnering with manufacturers to simulate the energy performance of new technology, but how accurate are they? To validate their model, EDSL and Mitsubishi Electric measured the actual energy consumption of a Chelmsford offi ce and compared it to a dynamic thermal simulation over the same period
to input performance data from most of its air conditioning and heating products into Tas, enabling designers to see the impact Mitsubishi systems and confi gurations had on simulated energy use. The HVAC supplier wanted to see how
The 3D model of the Chelmsford offi ce building
Mitsubishi Electric worked with EDSL to input performance data from most of its air conditioning and heating products into Tas
W 64 CIBSE Journal January 2013
hen Mitsubishi Electric decided to make the performance data of its HVAC systems available
in EDSL’s Thermal Analysis Simulation Software (Tas), it wanted to know just how accurate the simulations would be compared to real energy use and cost. It undertook a study with EDSL that
aimed to provide qualitative validation of a Tas building and plant simulation for an offi ce fi tted with a Mitsubushi CITY MULTI R2 Recovery system. Tas is a dynamic simulation model that
allows designers to predict on-going energy consumption, CO2
emissions, operating
costs and occupant comfort. Mitsubishi Electric worked with EDSL
good the Tas model was at predicting actual energy use for an existing building containing its equipment. It measured the energy consumption for a two-storey offi ce building for more than a year, and the data was compared against the simulation results to see how close predicted energy performance was to verifi ed use. The model was then updated to use the equivalent Mitsubishi Electric equipment from the current (2011) catalogue and the results were compared to the installed equipment simulation, to see what improvements in energy performance might be achieved by using the latest energy effi cient plant. Mitsubishi Electric then compared the updated equipment against the fancoil, chiller and heat pump notional system for Part L 2010.
Simulating offi ce containing Mitsubishi HVAC In 2004 Mitsubishi Electric conducted the energy consumption monitoring for a purpose-built offi ce in Chelmsford. The two-storey offi ce is served by 5 City Multi R2 outdoor units PURY-P250YMF-C and a total of 25 indoor units. The ground fl oor has two systems, including the yellow and dark green ones illustrated in the plans opposite. The three remaining systems – red, light green and blue – are on the fi rst fl oor. The fi rst-fl oor plan shows their positions. It was thought that the East West aspect of the building and large amount of glazing would suit a heat recovery system. This system was
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