[esp-r] unrealistic energy demands?

[Ing Liang Wong]

Hi all,

I am calculating the annual heating and cooling energy consumption for office buildings in UK climates. The heating and cooling setpoints are 20 and 24 degrees respectively. Internal casual gains from occupants, lighting and electrical equipment are assumed. The U-values for building fabrics are in accordance with the UK building regulations.

To my surprise, the results (annual heating and cooling energy consumptions) are around 35 and 16 (in kWh/m2 heated floor area). The values are a bit unrealistic compared to the DETR publication for energy consumption for standard air conditioned office buildings in the UK climates (128-226kWh/m2  for electricity and 97-178kWh/m2 for fossil fuels, or 200-260kWh/m2 for heating and 33-41kWh/m2 for cooling).

I had tried different simulations with variable heating and cooling capacities and temperature setpoints, it looks to me that my office building never meet the standard guidelines established by DETR.

Anyone had experienced the similar problem before? I am very confused since the results are unrealistic and thus, I find it very difficult to offer any explanation to the simulation results. Maybe some experienced users could shed any light in this case.

Thank you.

Regards,
Wong
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