Details of project:
Complete removal and replacement of communal heating and the individual hot water systems with new consumer heat interface units and smart meters in dwellings and the installation of a boosted cold water system.
The project involved: –
Maintaining heating and hot water services at all times with minimal disruption.
Maintaining mains cold water services at all times.
Replacement of Primary District Heating and HWS distribution pipework from the roof void to the dwellings.
Replacement and modification of in-flat heating and HWS pipework, including new radiators and connecting the new HWS supply to the existing system.
Installation of new Heat Interface Units (HIU) complete with smart meters.
Upgrade and replacement of cold water down service with a boosted system.
Removal of redundant services.
All associated builders work, decoration works and making good.
All associated Fire Stopping Works.
The installation of new inverter driven heating distribution pumps installed in a run & standby configuration.
The installation of a new buffer vessel.
The modification of control equipment and BMS panel as required in order to provide effective control of the new heating systems.
Details of plant room:
Two Hoval Ultragas fired boilers with a combined heat output of 1000Kw provide a constant supply of LTHW @ 80°C to a 1500L Buffer Vessel.
Drawing heat from the Buffer Vessel for distribution to the district heating network are four Grundfos TPED 50-290/2 BQQE Inverter driven pumps. The pump speeds are controlled by differential pressure sensors installed at the index points in the heat network.
Primary heat is measured within the Heat Interface Unit by a Sharky M-Bus Heat Meter that relays its information to data loggers that transmit through a wireless network to City West Homes’ energy monitoring and billing platform.
Details of size:
We installed 1,200 meters of distribution pipework ranging between 28mm and 100mm diameter.
This pipework, starting at the energy centre and rising to the roof space within both blocks, provides the primary LTHW distribution. From here we installed 22 risers feeding 108 dwellings.
The system has been designed and commissioned on Differential Pressure (DP). This is held at a constant at all four index points within the heat network, situated at the bottom of the furthest risers. Changes in demand are picked up by the sensors at the index circuits and change the output of the variable speed driven pumps to maintain a constant pressure of 35kPa under varying conditions.
We have installed a heat meter to each HIU to record and measure the amount of district heat taken from the network. We have utilised the landlord’s electrical supplies to ensure all electrical power used to drive and monitor the heat produced within the HIU is paid for by the landlord, as was the case in the existing district heating system. Each heat meter is wired back to central hubs where data stream loggers collate the information before transmitting to City West Homes’ energy monitoring and billing platform.
Details of benefit:
This project has cost saving benefits through efficiency measures to the residents and environment. Residents have gone from a 24 hour LTHW constant flow domestic hot water system with no control over hot water temperature or heating. The newly installed HIUs utilise a new boosted cold water supply providing a pressure range of 1.5bar – 2.5bar set with an output of 18L/m of hot water production.
Single panel and double panel radiators have been replaced with new efficient convector panel radiators each supplied with a thermostatic control valve. The heating system is now Part L compliant with a controlled/interlocked 7-day programmable room thermostat and pipe insulation throughout.
Based from the feasibility study undertaken the environmental benefits are predicted as:
A reduction in gas and electricity
Reduction of energy usage across the estate by 35%
Direct financial savings to residents in the region of £37,800 in gas consumption per annum, greatly assisting residents that are currently in fuel poverty
Reducing Westminster’s carbon footprint for these blocks by an estimated 235,000 kg/Co2
CLIENT: City West Homes
PROJECT: Eastlake & Tadema