DISTRICT HEATING LONDON HEAT MAP
operating temperatures, poor pumping and flow control have been reported, as well as a lack of accurate metering and poor commissioning. Hence the urgent need for CIBSE’s forthcoming work on minimum standards (see box on page 53). ‘There are challenges on the technical side, but they are quite achievable,’ argues Bungey. ‘You have to manage the system – monitor, control, look at the demand, alter the flow – and be sophisticated in terms of building control. If you have it set up incorrectly, problems can escalate.’ Terry Keech calls for more post-
occupancy evaluation of schemes to learn what works and what doesn’t. There are also concerns that, as the market
grows, there will be a lack of skilled engineers to do the job. ‘We do find it difficult to find competent people,’ says Bungey. ‘It’s quite difficult and we are looking abroad and considering apprenticeships.’ It’s clear that today’s heat networks face
many obstacles, but also present a massive opportunity. CIBSE, the CHPA and others are doing their bit to make sure the sector does not end up in hot water. CJ
District heating – not just a London thing
E.ON is working with five developers to build one of the largest district heating schemes outside London. The scheme at Cranbrook, near Exeter in Devon, will see 3,500 homes, and the 107-acre Skypark business park – comprising 1.4 million sq ft of commercial and retail units – all connected to a district heating network via E.ON’s energy centre. Outline planning consent was granted in June 2010 and construction began in the second half of 2011 on the first 2,900 homes. The first residents moved into their new homes in 2012.
It is expected that work on the residential area will be completed within eight years, and the Skypark development within 16 years. The scheme is recognised as a location for large- scale employment and is expected to provide more than 6,500 new jobs.
E.ON is responsible for the design and operation of the heat distribution network and energy centre, including heat interface units that will pipe heat into the individual homes and commercial premises.
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The £3m energy centre is located on the £120m Skypark development. The low carbon
heat source will change over time as the developments grow, with gas-fired boilers being supplemented by gas-fired combined heat and power (CHP), and later by biomass- fuelled CHP.
Renewable microgeneration technologies will also be added to the Cranbrook and Skypark properties to further meet low carbon targets.
The energy centre below is located on the Skypark site
The scheme is projected to deliver up to 13,000 tonnes of CO2 savings over a conventional approach.
The London Plan stresses the need for lifecycle costing rather than capital costs to be considered when developing heat networks
A shining reputation for reliability.
56 CIBSE Journal February 2014
www.cibsejournal.com
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