The Bodley block is part of Stroud District Council’s historic Ebley Mill offices. The block is used by a number of tenants and has a core ventilation system with heat recovery.
Our team here at Hurtwood have added this ventilation system to the sites Tridium BMS and dramatically improved the control of the supply and extract fans. Originally, the fans ran at fixed speeds irrespective of the occupation within the building. This meant that the heating had to work harder in the winter.
What we did
Hurtwood added some simple variable speed drives to the fans as well as a return air CO2 sensor. The fans can now be controlled on the return air CO2 and the ventilation rate matched to the occupants requirements for fresh air. This is saving both electrical energy used by the fans and the electrical energy used by the buildings heat pumps.
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In addition, the old temperature sensors on the ventilation plant were replaced. We will often need to tackle obsolescence on jobs and this is a common issue for many estates managers. The old temperature sensors were part of the original Tour Anderson controls from the 1980s and had long since ceased working. The ventilation plant is now working much more efficiently and effectively.
The use of Hurtwood’s unique Staefa Retrofit equipment and its IO modules that plug directly into 4mm DIN rail blocks allowed the upgrade to be carried out far more cost effectively. Our directly employed engineers are also locally based so have been able to carry the project out at a cost that ensures Stroud District Council will soon be generating revenue from the energy savings.