www.tarmbiomass.com 

4 Britton Lane ▪ P.O. Box 285 ▪ Lyme, NH 03768 ▪ 800.782.9927 

September 23, 2014 

Regarding: Renewable Heat NY Program, Call for Qualified Wood Pellet Boiler Technologies 

Revised to remove statement about CBI. 

To whom it may concern, 

Tarm Biomass is submitting test data for the Fröling P4 wood pellet boiler in sizes 8/15, 20/25, 32/38, 48/60, and 80/100 

kW (qualified wood pellet boiler technologies). 

All test data is derived from European testing conducted by TUV using EN303-5 and converted by Tarm USA, Inc. and 

Fröling as follows: 

For Converting CO from results at 13% O2 to results at 7% O2: 

a) using EN 303-5:2012 – chap. 5.10.4 Emissions: 

“These mean values of the volume parts (ppm) shall be used to calculate the mass values (mg/m3). For 

the rate of exchange from ppm to mg/m3, the following values should be used: 

• fCO = 1,25“ 

 1 mg/m3 @ 13% O2 / fCO = 0.8 ppm @ 13% O2 

 E [ppm @ 13% O2] = 0.8 x E [mg/m3 @ 13% O2] 

b) principle of dilution in dry exhaust gasses: 

 

with 

E,ref2 Emission rate referred to Oxygen concentration desired 

E,ref1 Emission rate referred to Oxygen concentration given 

Oref2 Oxygen concentration desired in % 

Oref1 Oxygen concentration given in % 

 E7 [ppm @ 7% O2] = (21 – 7) / (21 – 13) x E13 [ppm @ 13% O2] 

E7 [ppm @ 7% O2] = 1.75 x E13 [ppm @ 13% O2] 

c) combined formula (dry exhaust gas at standard conditions): 

E7 [ppm @ 7% O2] = 1.75 x 0.8 x E [mg/m3 @ 13% O2] 

 E7 [ppm @ 7% O2] = 1.4 x E [mg/m3 @ 13% O2] 
 www.tarmbiomass.com 

4 Britton Lane ▪ P.O. Box 285 ▪ Lyme, NH 03768 ▪ 800.782.9927 

For converting efficiency measurements from LHV to HHV (more formulas available on request): 

Tables for Ratio between US and European Boiler Efficiencies, based on typical European 

hardwood (usually used in log wood boilers) and coniferous wood (usually used e.g. in pellet 

boilers): 

 Base: Hardwood (EU) Base: Softwood (EU) 

 

LHV 

(dry) 18,0 MJ/kg 

LHV 

(dry) 19,0 MJ/kg 

 

HHV 

(dry) 19,3 MJ/kg 

HHV 

(dry) 20,4 MJ/kg 

 

w [%] u [%] LHV 

(wet) 

HHV 

(wet) 

ηUS / 

ηEU w [%] u [%] LHV 

(wet) 

HHV 

(wet) 

ηUS / 

ηEU

0 0,0 18,0 19,3 93,3% 0 0,0 19,0 20,4 93,1% 

5 5,3 17,0 18,3 92,6% 4 4,2 18,1 19,6 92,6% 

10 11,1 16,0 17,4 91,9% 6 6,4 17,7 19,2 92,4% 

12 13,6 15,5 17,0 91,5% 8 8,7 17,3 18,8 92,1% 

14 16,3 15,1 16,6 91,2% 10 11,1 16,9 18,4 91,8% 

15 17,6 14,9 16,4 91,0% 12 13,6 16,4 18,0 91,5% 

16 19,0 14,7 16,2 90,9% 15 17,6 15,8 17,3 91,0% 

18 22,0 14,3 15,8 90,5% 18 22,0 15,1 16,7 90,5% 

20 25,0 13,9 15,4 90,1% 20 25,0 14,7 16,3 90,1% 

22 28,2 13,5 15,1 89,7% 22 28,2 14,3 15,9 89,8% 

25 33,3 12,9 14,5 89,1% 25 33,3 13,6 15,3 89,2% 

30 42,9 11,9 13,5 87,8% 30 42,9 12,6 14,3 88,0% 

40 66,7 9,8 11,6 84,8% 40 66,7 10,4 12,2 85,2% 

50 100,0 7,8 9,7 80,6% 50 100,0 8,3 10,2 81,2% 

EU Log wood boiler efficiencies have to be multiplied by 0.897 to 0.910, EU Pellet boiler 

efficiencies have to be multiplied by 0.915 to 0.924! 
 www.tarmbiomass.com 

4 Britton Lane ▪ P.O. Box 285 ▪ Lyme, NH 03768 ▪ 800.782.9927 

For Converting Dust emissions to pounds of emissions/Million British Thermal Units:

Convert by unit analysis. Here is the conversion set up:

21 mg g 1 lb 1 MJ 1,000,000 Btu = 

MJ 1000 

mg 

454 g 948 Btu MMBtu

Cancel the units that you can and solve. You can do this by first multiplying across the numerator and then do the same 

for the denominator. Finally divide the numerator by the denominator. 

Convert by unit analysis. Here is the conversion set up: 

21 mg g 1 lb 1 MJ 1,000,000 Btu = 0.049 lb/MMBtu

Tarm Biomass and its partners have made the required calculations and attach them separately. 

Please contact me directly if there are any questions or concerns about our data. 

Feeling Good About Wood, 

Scott W. Nichols, President