Low carbon buildings and sustainability
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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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Low Carbon Buildings and Sustainability

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Low carbon buildings and sustainability

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

LZC Technologies

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.

Data

Office space heating demand50,000 kWh/annum

Data obtained from Building Regulations Part L2A (2006):

Grid supplied electricity – CO2 emission factor0.433 kg/kWh

Natural gas – CO2 emission factor0.194 kg/kWh

Biomass – CO2 emission factor0.025 kg/kWh

Read the Powerpoint presentation ‘Energy resources & fuels’ before attempting this exercise.


Lzc technologies1

LZC Technologies

Option A

Ground source heat pump (GSHP) - Coefficient of Performance (CoP) 3.5

Capital cost £800/kW output

Electricity cost £0.09/kWh

Option B

Biomass boiler, thermal efficiency 60%

Capital cost £350/kW output

Fuel cost – wood pellets £0.04/kWh

Option C

Gas fired condensing boiler, thermal efficiency 95%

Capital cost £90/kW output

Gas cost £0.05/kWh

Determine

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.


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