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3 Interpreting the results

The results of this project are presented in template form to allow easy comparison of the various heating options. Most of the criteria used in the templates are self-explanatory, but there are a number of abbreviations and technical terms used that may not be familiar to all readers. The most significant of these are explained below.

Measurements of energy:

KWh: kilowatt hour

L/KWh: litre per kilowatt hour

W/m2: watt per metre squared

mg/MJ: milligrams per megajoules

g/kg: grams per kilogram

Particulate emissions:

PM10: particles measuring less than 10 microns in diametre

PM2.5: particles measuring less than 2.5 microns in diametre

Greenhouse gas emissions:

CO2: carbon dioxide

NOx: oxides of nitrogen

SOx: oxides of sulphur

Other emissions:

CO: carbon monoxide

Embodied energy: energy used during the production and use of the good

Efficiency of conversion of energy to heat: how much energy in fuel is converted to heat

Heating capacity: the amount of heat produced by the appliance measured in kilowatts

Heat-transfer system: ventilation system which extracts air from a warm room and channels it to a cold room. For this system to be feasible the space heater in the warm room must have sufficient heating capacity.