SAV Energy Centres based on LoadTracker combined heat and power units now serve town developments, luxury flats, council estates and sheltered housing. Carbon savings of around 20% accrue from such projects. In addition, site-based generation delivers appreciable cost savings.
SAV’s assessments of CHP potential are of particular value with housing developments, as loads can be closely matched. As a result, the selection of LoadTracker units can be optimised, with respect to heating and hot water demand.
Regardless of format of the available data, SAV can make the assumptions necessary to deliver a complete CHP assessment. Although SAV staff members are not accredited under SAP (Standard Assessment Procedure), full information relating to the CHP element is made freely available to whichever office is tasked with the SAP calculations.
With primary flows from a centralized central plant room, Danfoss FlatStation Heat Interface Units (HIUs) provide the LTHW interface at each dwelling. Each unit plate heat exchanger provides instantaneous hot water, with accurate temperature control regardless of flow.
Direct type FlatStations are recommended where primary head is sufficient for heating circuits. Alternatively, indirect versions provide a hydraulic break between the primary and secondary heating circuits. Where thermostatic valves are called for, optimum operation would be secured by controlling the differential pressure between upsteam / downstream piping. FlatStations are an important element in the design of heat networks operating at 70 flow / 40 return.
To simplify hot water arrangements to each dwelling, FlatStations can be fitted with a DHW distribution manifold. A parallel BCW manifold keeps piping very compact, as most of the line routing is shared.
Buffer vessels are used to meet DHW demand peaks. SAV can help with buffer vessel and heat generator sizing, taking account of FlatStation HIU rating, coincidence factors and back-up gas boiler requirements.
Energy usage by residents of district heating schemes must be individually tracked to enable accurate billing. SAV Kamstrup energy meters help property management companies to monitor such usage, observe results in real time via downloads and generate automatic billing to tenants or owner occupiers. Pre-payment meters can be offered where expected occupant profile suggests this would be appropriate.
Accurate control of radiator flows is of increasing importance when designing for apartment indoor comfort. Not only are thermostatic radiator valves (TRVs) a normal requirement, but they should also function independently of pressure fluctuations upstream. The SAV Pt40 valve meets both requirements, in that it is thermostatic and pressure independent. It has been applied successfully across a broad range of residential projects: over 40,000 valves installed during 2018 alone.
Where concerns arise regarding rising return temperatures (such as from towel rails), the Rt40 can be used instead. This valve monitors water conditions (not air) and makes sure that return temperatures are not allowed to surge.