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 - Answers. Space Heating 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 answers

LZC Technologies - Answers

Space Heating LZC technologies

a) CO2 emissions (kg/annum) for each LZC technology

Energy used = space heating demand / thermal efficiency or COP

CO2 emission = electricity energy used x CO2 emission factor

Option A GSHP

Electricity energy used = 50000/3.5= 14286 kWh

CO2 emission= 14286 x 0 433= 6186 kg/annum

Option B Biomass

Thermal energy used= 50000/0.6= 83333 kWh

CO2 emission= 83333 x 0.025= 2083 kg/annum

Option C Gas

Thermal energy used= 50000/0.95= 52632 kWh

CO2 emission= 52632 x 0.194= 10210 kg/annum

CoP of heat pump

Space heating demand

CO2 emission factor

Space heating demand

Efficiency of bomass boiler

CO2 emission factor

Space heating demand

Efficiency of condensing boiler

CO2 emission factor


Lzc technologies answers1

LZC Technologies - Answers

Gas CO2 emissions

Space Heating LZC technologies

b) % CO2 emission savings for A and B

A GSHP

% CO2 emission saving= (10210-6186)/10210 x 100= 39.4%

B Biomass

% CO2 emission saving= (10210-2083)/10210 x 100= 79.6%

c) Capital costs of each option

Capital cost = cost per output x output capacity

Option A GSHP

Capital cost= £800 x 100= £80000

Option B Biomass

Capital cost= £350 x 100= £35000

Option C Gas

Capital cost= £90 x 100= £9000

Gas CO2 emissions


Lzc technologies answers2

LZC Technologies - Answers

Space Heating LZC technologies

d) Annual running costs of each option

Running costs = electricity energy used x electricity cost

Option A GSHP

Running cost= 14286 x £0.09= £1286/annum

Option B Biomass

Running cost= 83333 x £0.04= £3333/annum

Option C Gas

Running cost= 52632 x £0.05= £2632/annum

Conclusion

It would not be possible at present to justify options A and B on payback period alone.

Options A and B may be required in order to secure Building Regulations Part L planning approval.

Electricity energy used

Electricity cost

Wood pellet cost

Electricity energy used

Electricity energy used

Gas cost


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