Post-Occupancy Evaluation

Post-Occupancy Evaluation (POE)

Posted by on Aug 13, 2014 in Post-Occupancy Evaluation | Comments Off

Post-Occupancy Evaluation (POE)

We are interested in how Passivhaus buildings actually perform and we thought you might be, too. We want to understand how occupants are finding living in low-energy homes and whether their Passivhaus homes are living up to their (and our) expectations. The following graphs present the first stages of our analysis.  They cover a number of certified Passivhaus dwellings that we have had involvement in over the last couple of years. Read more about: The performance gap Energy benchmarks & targets Comfort The houses measured Carbon Emissions CO2 emissions take account of all energy used by...

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POE: The Performance Gap

Posted by on Aug 13, 2014 in Post-Occupancy Evaluation | Comments Off

This post is part of a series on post occupancy evaluation (POE). Click here for the main article. The performance gap describes the well-recognised disparity between designed and in-use energy consumption. There is extensive interest in the performance gap right now; see Zero Carbon Hub’s work: http://www.zerocarbonhub.org/current-projects/performance-gap.  There are many examples that show that the performance gap observed when using complex technologies to make a building zero carbon is often greater than when a fabric first approach is used. Conversely, many traditional buildings use...

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POE: Energy Benchmarks and Targets

Posted by on Aug 13, 2014 in Post-Occupancy Evaluation | Comments Off

This post is part of a series on post occupancy evaluation (POE). Click here for the main article. An energy benchmark provides a reference level of energy consumption, against which other buildings can be compared. An energy target provides a minimum aspirational level of energy consumption. Benchmarks are ideally based on data from a sample of real buildings and can be used to compare buildings in use (e.g. the low energy buildings database: http://www.lowenergybuildings.org.uk/).  Targets, on the other hand, are usually calculated from computer simulation or mathematical models and can be...

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POE: Comfort and Energy Consumption

Posted by on Aug 13, 2014 in Post-Occupancy Evaluation | Comments Off

This post is part of a series on post occupancy evaluation (POE). Click here for the main article. When assessing energy consumption it is critical that buildings are “normalised” for thermal comfort.  For example, if you keep your home at 15 oC throughout the winter then your energy consumption will be much lower than a house at 20 oC (if all other conditions were the same then this would represent a rough doubling in energy consumption). Typically, temperature and humidity are measured as a reflection of internal comfort. We have this data for most of the projects.  CO2 and VOC...

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POE: The Houses Monitored

Posted by on Aug 13, 2014 in Post-Occupancy Evaluation | Comments Off

This post is part of a series on post occupancy evaluation (POE). Click here for the main article. All the houses are new-build and have been certified to the Passivhaus standard.  Some of the houses have been monitored by ourselves, and some by a third party. The houses that are heated with gas are a mixture of owner-specified detached dwellings and terraced social housing.  Some have solar hot water but most are fed from combi. boilers. The houses that are heated by electricity are all terraced social housing and have solar hot water...

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