Case Study No.8

More information and help

Supporting Information

For further information on the Central Energy Efficiency Fund see website:www.psecni.gov.uk

Publications from the Carbon Trust

GPG388 – Combined Heat and Power for Buildings

FL87 – Saving Money With Combined Heat and Power

GPCS458 - CHP at an Engineering Company

GIR082 – The Managers Guide to Custom Built Combined Heat and Power Systems

For details of the Carbon Trust’s services and free publications, call the helpline on 0800 85 20 05 or visit the website: www.thecarbontrust.co.uk

The Combined Heat and Power Association:

Website: www.chpa.co.uk

The Combined Heat and Power Quality Assurance Scheme:

Website: www.chpqa.com

To register under the CHPQA scheme for climate change levy exemption a quality index (QI) of greater than 100 is required.  The formulae for calculating QI is as follows:

QI = X  P + Y  H

Where:

X is a factor for power related to alternative electricity supply options.

Y is a factor for heat related to alternative heat supply options.

P is the electrical generation efficiency

H is the heat generation efficiency

For the 210 kWe natural gas fired reciprocating engine unit at Hydebank

X = 200 and Y = 125

The calculated electrical generation efficiency was 30.6%.  Therefore P = 0.306

The calculated heat generation efficiency was 32.8%.  Therefore H = 0.328

Thus QI = 200 x 0.306 + 125 x 0.328 = 61.14 + 41.0 = 102.14.

Hence the unit at Hydebank qualifies for climate change levy exemption.

Other Publications

Energy Efficiency Best Practice Programme:-

Good Practice Guide 312 - Invest to Save?

Further Project Information

Terry Moseley: Terry.Moseley@nio.x.gsi.gov.uk