Chemistry Teaching Laboratory Fume Cupboard Refurbishment – University of Leeds Bob DouglassEnergy Officer

University Targets 35% Carbon emission reductions against 2005/6 baseline by Target is annual emissions of 24,400 tonnes of carbon by /13 data: Energy Cost £13,245,508 Total energy used 193,310MWh Carbon emitted 57,063 tonnes

Implementing the CMP The aims of the Universities Carbon Management Plan are threefold: – To make a significant contribution to government carbon targets. – To help the University deliver its core business in a more sustainable way – To save money Delivered by embedding energy reduction into everything we do e.g. procurement & day-to-day management systems. However, majority of savings coming through building disposal, refurbishment (fabric & services improvement) & engineering solutions.

Energy Data Key Performance figures 2012/132011/12 Carbon emitted (tonnes)57,06370,874 Energy consumption (MWh)193,310217,414 Energy costs£13,245,508£13,005,778

Fume Cupboard Energy Savings Over 270 ducted fume cupboards on main campus Each cupboard can potentially consume the equivalent energy of 2-3 houses over the course of a year. Equivalent to 18 tonnes of Carbon per cupboard per annum Energy costs can be significantly reduced through good design and simple management steps

Priestley Laboratory Fume Cupboard Refurbishment. Chemistry building selected for review as second largest energy consumer Priestley Laboratory large 765m 2 teaching laboratory with 63 fume cupboards. Total energy used for year measured as 4360MWh, 1171 tonnes carbon. £187, VAT £345,000 from Carbon Management Plan budget spent upgrading fume cupboard systems

The Process - Key Elements Engage with stakeholders, before, during and after the project Multi-disciplinary proactive internal planning team. Risk and Feasibility Analysis Design consultant with a documented track record in sustainable design, working with Fume Cupboard and BMS specialist. Measurable goals with metrics tracked consistently during and after the design process. The primary metrics being user safety, ease of use and maintainability and energy efficiency. Project review

Containment One particular area of concern to the users was the proposed reduction of air face velocity from 0.5m/s to 0.4m/s. To allay these concerns we arranged for a specialist contractor to undertake an on-site robustness test to BS EN14175 using sulphur hexafluoride (SF6) as the trace gas. The test results showed that at 0.4m/s the containment of the cupboard was proven with a containment of less than 0.01ppm recorded. Subsequent SF6 testing was undertaken at the end of the project to ensure containment was achieved.

Feasibility Gordon Sharp PD pressure drop HR heat recovery

Constant Volume Fume Cupboards Existing duct work systems and cupboards upgraded to changed from constant volume to variable volume operation. Mechair

Variable Air Volume Cupboards Mechair

Control Schematic

To turn the fume cupboards into VAV systems fast acting motorised dampers were fitted to each of the 63 fume cupboards along with new cupboard controllers. To maintain stack discharge velocity and reduce control volatility motorised bleed damper were fitted to the eight roof mounted extract fan systems, these modulating to maintain a constant duct pressure. Each extract fan serves up to eight cupboards in the laboratory below. Motorised Dampers

Dedicated Storage Extract Independent solvent and chemical storage cupboard ventilation system installed to extract from end of line and under cupboard storage cabinets.

Passive Infra-red sash prompts fitted to cupboards to prompt users to close sashes if left open and unattended for more than 2 minutes. Controller sound alarm and flashes warning text advising user to shut sash. Sash Prompts

User Controls Improved local controls to enable lab staff to select appropriate number of fume cupboards for class size and isolate those cupboards not required.

Install remote monitoring system using a SIP modbus interface to export data and energy sub metering to Trend BMS graphics page and M&T software package. Remote Monitoring

Behavioural Change Promoted behavioural change with Sustainability Service “Shut the Sash” campaign

Out of Hours Bypass Install a bypass duct from dilution system 5 to dilution system 4 to allow bank of eight cupboards to run outside of normal hours without having to enable full system

From Space

Summary Existing duct work systems and cupboards upgraded to change from constant volume to variable volume operation. Independent solvent and chemical storage cupboard ventilation system installed Duct work altered to provide energy efficient facility for 8 Cupboards to operate outside of normal operational hours Passive Infra-red sash prompts fitted to cupboards to prompt users to close sashes if left open for more than 2 minutes. Improved local controls to enable lab staff to select appropriate number of fume cupboards for class size and isolate those cupboards not required. Install remote monitoring system and energy sub metering to check operation. Promoted behavioural change with Sustainability “Shut the Sash” campaign

What did we achieve? Over a 6 month period we recorded the following savings: A reduction in thermal energy of 1647MWh th A reduction in electrical energy of 347MWh e Energy costs reduced by £81, net 511 tonnes of carbon saved.

In addition: Raised awareness amongst staff and students of fume cupboard operational costs and in particular the role they can play in reducing costs. Behavioural change in use of fume cupboard sashes resulting in safer and more energy efficient operation. Improved reporting, monitoring and analysis of fume cupboard use. A quieter and more comfortable working environment due to the reduction in supply and extract air volumes.

Priestley Laboratory Steam Consumption

Chemistry South Wing Electrical Consumption (kWh)

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