Low Carbon Buildings and Sustainability. By Dr David Johnston – licensed under the Creative Commons Attribution – Non-Commercial – Share Alike License http://creativecommons.org/licenses/by-nc-sa/2.5/. LZC Technologies. Space Heating - Low or Zero Carbon (LZC) technologies
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By Dr David Johnston – licensed under the Creative Commons Attribution – Non-Commercial – Share Alike License
Space Heating - Low or Zero Carbon (LZC) technologies
An office is to be provided with an underfloor space heating system. The annual space heating energy demand has
been estimated from modelling studies and alternative heating systems are to be evaluated. The output capacity required
(maximum) from any heating plant selected is 100 kW.
Office space heating demand 50,000 kWh/annum
Data obtained from Building Regulations Part L2A (2006):
Grid supplied electricity – CO2 emission factor 0.433 kg/kWh
Natural gas – CO2 emission factor 0.194 kg/kWh
Biomass – CO2 emission factor 0.025 kg/kWh
Read the Powerpoint presentation ‘Energy resources & fuels’ before attempting this exercise.
Ground source heat pump (GSHP) - Coefficient of Performance (CoP) 3.5
Capital cost £800/kW output
Electricity cost £0.09/kWh
Biomass boiler, thermal efficiency 60%
Capital cost £350/kW output
Fuel cost – wood pellets £0.04/kWh
Gas fired condensing boiler, thermal efficiency 95%
Capital cost £90/kW output
Gas cost £0.05/kWh
a) The CO2 emissions (kg/annum) for each option.
b) The % CO2 emission savings from options A and B, relative to the gas condensing boiler.
c) The capital costs of each option.
d) The annual running costs of each option and comment on the likely payback implications from selection of options A or B.