COST MODEL | BUSINESS PARKS Heating and cooling cost model Commercial ofce Unit Fullment centre Rate Unit Rate SHELL AND CORE The rates are current in the third quarter of 2021, based on a location factor of outside the M25. Exclusions include, but are not limited to, main contractor overheads and profit, preliminaries, professional fees, and VAT. Both buildings are designed to meet Breeam Excellent standards. The cost model has excluded any allowance for increased lead-in times, effects of Covid, or currency fluctuations. Next steps Stricter legislation is likely to drive further reductions in energy use and a buildings carbon footprint. These new targets will be met through new technology and energyreduction measures. In an office, this could be wider temperature ranges on floor plates, reducing the volume of air per person, and natural ventilation. Energy use could be reduced by connecting users across the business park, enabling buildings to share heating and cooling through the ambient loop. For example, heat rejection from the refrigeration element of a large-scale supermarket could provide low-grade heat for a residential or hotel development. CJ HANNAH REYNOLDS and MAX RATTENBURY are specialist MEP cost managers at Aecom Table right: Cost model for a fullment centre and ofce on a large business or industrial estate just outside of the M25 Disposal installations Copper condensate drainage to fan coil units, and plant, including pumps Water installations Instantaneous hot-water heaters Storage caloriers linked to WSHPs m2 1.50 m2 0.95 m2 m2 2.10 1.25 m2 m2 0.15 0.25 m2 m2 m2 m2 16.15 4.23 N/A 6.17 m2 m2 m2 m2 4.01 1.84 1.98 1.02 m2 2.12 m2 0.35 m2 m2 m2 m2 1.50 28.36 1.25 N/A m2 m2 m2 m2 1.50 2.56 0.25 5.47 m2 m2 12.37 13.25 m2 m2 5.63 5.23 m2 m2 40.23 N/A m2 m2 N/A 6.23 m2 55.20 m2 17.23 m2 m2 m2 5.72 5.63 24.68 m2 m2 m2 1.56 1.69 6.89 Space heating and air treatment Air source heat pumps (ASHPs) Water source heat pumps (WSHPs) VRF over-door heaters (high bay doors) Close-coupled VRF units to AHUs Connection to site-wide energy network via plate heat exchangers Ambient loop, including pumps, pipework, etc (cost split on area) Primary pipework distribution Spot cooling via DX units Specialised cooling to communication rooms AHUs (roof-mounted for ofce, external compound for warehouse) Ductwork installations CAT A / FIT OUT VRF installation to ofces Fan terminal units for supply and extract air to warehouse Ductwork distribution MEP contractors on costs Builders work in connection with services MEP testing and commissioning MEP subcontract preliminaries Total cost 221.71 64.79 46 February 2022 www.cibsejournal.com CIBSE Feb22 pp45-46 Cost Model.indd 46 28/01/2022 16:24