8/7/2019 Econergy Midlands Office Case Study 30kW

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W ood f ue l l ed bo i l e r s B i omas s ene r gy s e r v i c es D i s t r i c t Hea t i ng  

T e l : 0 8 7 0 0 5 4 5 5 5 4 w w w . e c o n e r g y . l t d . u k e - m a i l : s a l e s @ e c o n er g y . l t d . u k  

Econergy Midlands Office, Harnage, 30kW

Harnage Estates, near Telford, is the location of

Econergy Midlands office. This office is the centre forEconergy Distributors and Econergy staff technical &servicing boiler training. Econergy decided to install awood boiler to heat the office and provide a training tool.

Boiler

Due to the availability of logs on the estate from theadjacent Midlands Wood Fuel company, a 30kW FHGFroling high efficient log boiler was chosen.

Technical Summary

• 91% efficient.

• Lambdatronic S3100 Comfort controls to givemodulating combustion control via Lambdasensor.

• Turbulator package for easy cleaning andsustained high efficiencies.

• Large filling capacity for half metre logs andcoarse chopper fuel

• Electronically controlled induced draught fan, so

the boiler can be started with ease, even when theflue is cold

Below; 30kW Log boiler with 2,000 litre buffer tank

8/7/2019 Econergy Midlands Office Case Study 30kW

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W ood f ue l l ed bo i l e r s B i omas s ene r gy s e r v i c es D i s t r i c t Hea t i ng  

T e l : 0 8 7 0 0 5 4 5 5 5 4 w w w . e c o n e r g y . l t d . u k e - m a i l : s a l e s @ e c o n er g y . l t d . u k  

Above; Log store, one box last approximately 4 weeksBelow; Boiler loaded and ready for lightening through the secondchamber door

Buffer Tanks

The use of a hot water buffer tank in logboiler central heating systems is a newconcept in the UK, although common placein Austria.

It operates as a heat store for the system,

charging up when the boiler has satisfiedthe heat load, and discharging when theboiler has burnt through a batch of logs andthe heating system requires heat.

This reduces the number of times the boilerhas to be attended, reducing customerworkload and increasing system efficiency.

A 2000 litre buffer tank was installed for thisproject.

Operation

• Boiler is loaded with logs up to once aday in the coldest part of the heatingseason, perhaps 2 or 3 times a weekin spring and autumn,

• The boiler is safely lit through themiddle door.

• The boiler will start immediately withhelp from the induced draught fan

• Due to the high efficiency there isvery little ash.

• Maintaining the boiler is very straightforward, normally a 10 minute cleanevery week to remove the ash fromtwo accessible places using the toolsprovided.

• The log boiler at Harnage uses a boxof logs about every three to four

weeks.

• This equates to around 3 / 4 tonnes ayear

Fuel Requirements

The boiler requires seasoned logs / wastewood up to half a metre in length and anaverage moisture content of 25%. It isessential that clean logs / waste wood fuelis used. In particular, it must have no

additives such as paints, varnish orchemical treatment.