4.1.3 Specific CO2 emission of a smart phone
Based on the above analysed results, we estimated the CO2 emission of a smart phone use.
Here, we considered the indirect and the direct CO2 emissions. The direct CO2 emission is
equivalent to the fuel consumption origin. On the other hand, the indirect one is mainly on
the device of a smart phone. In this study, we focused on HTC Desire X06HT made in
Taiwan as a model phone. The indirect CO2 emission is calculated by Input-Output (IO)
table, and this emission referred to the prior result. Also, we estimated the conventional
smart phone including Li-ion battery in order to compare to the new one. Assuming that the
holding time (life time: LT) when one user has a smart phone until he or she change the new
one is 2.6 years, the indirect CO2 emission of HTC Desire X06HT including Li-ion battery
would be 15.32 kg-CO2/unit. The emission of a smart phone with a PEFC unit would be
15.30 kg-CO2/unit. Although there are uncertainties on the storage tank of H2 to some
extent, referring to the data of DMFC storage tank which has already developed, we
estimated the emission as almost same as the conventional case (Dowaki et al., 2010a).
Next, the direct CO2 emission is affected by the specific CO2 emission of each fuel. Here, the
CO2 emissions of conventional electricity, H2 fuel of natural gas origin (on-site) and Bio-H2
are assumed to be 123.1 g-CO2/MJ, 121.3 and 39.6 g-CO2/MJ-H2, respectively. The CO2
emission per one life cycle is shown in Fig. 9. Note that the specific emission of Bio-H2 is a
minimum level (see Fig. 5).
4.1.3 Specific CO2 emission of a smart phoneBased on the above analysed results, we estimated the CO2 emission of a smart phone use.Here, we considered the indirect and the direct CO2 emissions. The direct CO2 emission isequivalent to the fuel consumption origin. On the other hand, the indirect one is mainly onthe device of a smart phone. In this study, we focused on HTC Desire X06HT made inTaiwan as a model phone. The indirect CO2 emission is calculated by Input-Output (IO)table, and this emission referred to the prior result. Also, we estimated the conventionalsmart phone including Li-ion battery in order to compare to the new one. Assuming that theholding time (life time: LT) when one user has a smart phone until he or she change the newone is 2.6 years, the indirect CO2 emission of HTC Desire X06HT including Li-ion batterywould be 15.32 kg-CO2/unit. The emission of a smart phone with a PEFC unit would be15.30 kg-CO2/unit. Although there are uncertainties on the storage tank of H2 to someextent, referring to the data of DMFC storage tank which has already developed, weestimated the emission as almost same as the conventional case (Dowaki et al., 2010a).Next, the direct CO2 emission is affected by the specific CO2 emission of each fuel. Here, theCO2 emissions of conventional electricity, H2 fuel of natural gas origin (on-site) and Bio-H2are assumed to be 123.1 g-CO2/MJ, 121.3 and 39.6 g-CO2/MJ-H2, respectively. The CO2emission per one life cycle is shown in Fig. 9. Note that the specific emission of Bio-H2 is aminimum level (see Fig. 5).
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