CASE STUDY SCOTSTOUN HOUSE
Post-occupancy evaluation
As well as energy consumption and carbon performance ratings, it is becoming increasingly important to understand how satisfied people are with the building they work in, given the growing pressure on businesses to reduce space, increase productivity and use less energy.
As a part of the POE undertaken by Arup, the Building Use Studies (BUS) analysis method was used to obtain occupant feedback. The BUS analysis method is a quick and thorough way of obtaining high-level feedback data on building performance from the occupants of that building. Twelve key summary variables are considered, including scores for comfort, noise and lighting, through to design, needs and image. In the ‘slider’ graphics included (below and adjacent) the building scored highly in all aspects of the assessment, such as temperature, air quality, lighting, noise and design. The occupants reported a perceived increase in productivity and healthy environment.
Temperature in summer: overall Temperature in winter: overall Air in summer: overall Air in winter: overall Lighting: overall Noise: overall Design Needs
Health (perceived) Image to visitors Productivity (perceived)
The building was assessed and compared to other similar buildings. Scotstoun House was assessed against 60 other buildings as a part of the assessment. The graphic below benchmarks Scotstoun House against the comparison buildings for comfort; Scotstoun House is placed very high against the comparison buildings. In addition to the BUS, Arup undertook POE of many aspects of the design. The intention was to validate the original analysis and to review lessons learned. This has included daylight performance and internal thermal environment. Actual daylight levels were measured and compared with the daylight modelling results. The measured average daylight factor of 6.3 compared favourably with the modelling results of 6.6.
As a part of the monitoring, actual energy consumption was measured for the artificial lighting and compared with the modelling predictions. Again, the comparison was favourable and has demonstrated that the solar tubes are delivering a 60% reduction in energy consumption
www.cibsejournal.com February 2013 CIBSE Journal 35
for artificial lighting. The results are included in the graph below.
Scotstoun House has temperature monitoring sensors throughout its occupied spaces. The control system also includes a weather station. Data has been continuously collected from these sensors and assisted in the seasonal commissioning for the building to optimise temperature control. Below are extracts from the monitoring.
During July 2010, the external temperature peaked each day in the range 23O
C to 25O
represented design summer conditions. The internal temperature was in the range 20O 23O
C, which C to
C and regularly less than the peak external temperature. The thermal mass provided by the phase change board in the ceiling, coupled with the night-time cooling control, is effectively maintaining a comfortable environment in the building.
30 25 20 15
0 1 2 3 4 5 6 7 Days of the week
Outside temperature Internal temperature
70000 60000 50000 40000 30000 20000 10000 0
The design team has built on the simplicity of Peter Foggo’s original design and has created an elegant refurbishment, which still adheres to the modernist principles of ‘light and air’
Without daylighting
With daylighting
0 1 2 3 4 5 6 7 8 9 10 11 12 Months of the year
kWhrs
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