N-SURV were commissioned to provide Commercial EPCs for 24 units including 4 large retail stores and a stand alone prefab pod unit. The site was originally constructed in the mid 1970’s consisting of reinforced concrete slabs likely produced in situ (limited documentation remains available for verification) with flat, concrete roofs. HVAC was decentralised and comprised a variety of unit specific electrical wall heaters and generic air conditioning/heating split systems. Hot water systems were also varied, although typically instantaneous with no storage capacity, in the smaller units (kitchen/team making areas) and toilets. In the larger stores is was usual to encounter a gas LTHW boiler with additional immersion storage capacity. Glazing was predominantly single pane display type mounted in a hardwood or aluminium frame. Most units would benefit significantly from internal insulation, a centralised air conditioning system and the entire site would make large reductions on the combined carbon footprint simply by a modernisation of lighting systems specifically the replacement of compact fluorescent lighting with modern LED style lamps.
Modelling the site was completed using DesignBuilder software and it was considered sensible to construct the entire site as a single model (rather than separate, per unit individual models) and run the EPC calculations (NCM) specific to individual units by excluding non-relevant units from the calculations, defining the desired unit with adiabatic boundaries on either the vertical or horizontal plane.
The site was split over two levels, ground and underground envelope definition was reliant on clear placement of non-regular ground blocks.
All the information contained in this report is available publicly on the Landmark administered Energy Performance Certificate Register.