Biomass heating of buildings of different sizes

 

Based on specific examples in the UK and elsewhere. These figures are given purely as approximate guidance and precise energy requirements for a given building will depend on many constructional and operational factors.  See notes below for fuel assumptions

Building type  Annual energy demand (MWhth System size (kWth Wood chips p.a. 30% MC Wood pellets p.a. 10% MC  Land area required

 tonnes

note 1

m3

note 2

 tonnes

note 3

m3 

note 4

Forest residues (ha)

note 5

SRC (ha)

note 6

Miscanthus (ha)

note 7

 Domestic house 20 20  5.7 23 4.2 6.3 2 0.5 0.3 
 Small industrial unit 140 100 40 160 29 44 14 3 2.3
Large farm with outbuildings 

400 

150   114 460   83 125   40  9 6.5 
 Hotel  660  250  190  760  138  205  66  15  11
 Municipal complex  360  300  100  400  75  115  36  8  6
 District heating scheme  600  500  170  700  125  190  60  13  10
 Municipal buildings  1,000  700  290  1,150  210  315  100  22  16
Greenhouse 4,200 1,200 1,200 4,800 875 1,300 420 93 70
CHP (ORC) 14,800 (thermal) 1,850 (400 kWe)

6,600

26,400 4,800 7,200 2,300 500 380
 CHP/Power station  16,000 (electrical)  2,000 kWe  20,000  40,000  14,600  21,800  6,900  1,550  1,160

Notes:

  1. 3.5 MWh/tonne (12.6 GJ/t) mixed hard and soft wood
  2. 250 kg/m3 = 0.9 MWh/m3 (3.2 GJ/m3)
  3. 4.8 MWh/tonne (17 GJ/tonne)
  4. 670 kg/m3 = 3.2 MWh/m3 (11.4 GJ/m3)
  5. 2 odt/ha = 2.9 tonnes @ 30% MC
  6. 9 odt/ha = 12.9 tonne/ha.a @ 30% MC
  7. 13 odt/ha = 17.3 tonne/ha.a @ 25% MC