• Contact
• Text Size: A A A

Performance Data

A Whole Building Analysis is underway in the form of a Life Cycle Analysis(LCA). LCA is a quantitive method used to determine the environmental implications of resource use during the full lifespan of a building. This analysis involves calculating the following:-

Life Cycle Energy (LCE)

The total energy used by the building throughout its useful life which consists of:-

• Initial Embodied Energy - the energy attributed to the materials and elements used in construction.
• Operative Energy - the energy used to operate building throughout its useful life.
• Recurrent Embodied Energy - the energy added during the maintenance, renovation and replacement of materials and elements.
• Deconstruction Embodied Energy - the energy used to dispose of the materials of the building at the end of its useful life.

Life Cycle Costing (LCC)

Life Cycle Costing is an economic assessment of all significant costs of ownership, considered over the useful life of a building and is expressed in terms of £'s/m2. LCC identifies the initial cost of the building construction, its maintenance, refurbishment and its operating costs.

An LCC exercise for 21 The Street will provide data to enable evaluating alternative specification options and financial planning that could be applied to the refurbishment of Wherry Housing Associations existing housing stock.

Standard Assessment Procedure (SAP)

SAP. South Holland District Council GTB Ringland Post-Adaptation

For the work carried out at Ringland there was no mandatory requirement for a SAP Rating. However, the methodology was useful in obtaining data for comparison purposes.

In the UK, the Standard Assessment Procedure (SAP) is the Governments recommended method for measuring the energy rating of residential dwellings. Included within that procedure are theoretical running costs for space and water heating and quantities of carbon dioxide emissions.

A SAP Energy Rating is a calculation of a dwelling’s energy efficiency, scored on a scale of 1 (highly inefficient) to 100 (highly efficient), where 100 represents no net cost of water and heating. A score of 80 or more is considered to portray an energy efficient new home. It is estimated that most of the UK’s existing housing stock has an equivalent SAP Energy Rating between 40 and 60. A dwelling is deemed to have passed SAP if its Dwelling Emission Rate (DER) is equal or less than its Target Emission Rate (TER).

In its pre-adapted condition the Ringland property’s SAP rating of 30, failed the minimum energy performance requirements by a margin of 92.51 points, i.e. DER 117.88 exceeded its TER of 25.37 by a factor of four.

SAP. South Holland District Council 21TS Pre-Adaptation

This score placed the building well below the UK average SAP Rating for current social housing stock of 57.4 and the private stock of 46.8.

In its post-adaptation condition, the Ringland property, achieved a SAP Rating of 86 which represents a 65% improvement in its Energy Rating and according to this methodology, is an energy efficient building.

Some useful comparisons between the pre and post adaptation SAP calculations;

In its original form;

The property would have used 680 kWh/m2/yr (48,960 kWhrs/yr) at a cost of £706.63.

In its adapted form it is predicted to be 124 kW/m2/yr (9,424 kWhrs/yr) at a cost of £169.38 which represents an 81% reduction in the dwellings use of energy with an annual monetary saving of £510.62.

Pre-adaptation CO2 emissions as calculated by SAP would have been 7.65 tonnes per year compared to the post-adaptation CO2 emissions of 0.54 tonnes per year.

Therefore, greenhouse gas emissivity reductions from GTB Ringland have been reduced by 93%.