2002 Volume 81 Issue 12 Pages 1078-1088
It can be supposed that introduction of MGT-CGS to small-medium size buildings will increase in future from the view point of energy saving and global environment because of its suitable capacity to such buildings and high efficiency. In this paper environmental burden of MGT-CGS was evaluated in terms of CO2 emission in both production and operation stages of the system. Investigation was proceeded for the case in which MGT-CGS was applied to an apartment house (floor space 12, 000 m2) and a super market (floor space 3, 000 m2) as an example. The result was compared with that of grid electricity and heat supply system with absorption chiller-heaters. The possibility of CCO2 emission reduction was clearly illustrated when the MGT-CGS was installed for an apartment house and a supermarket in common, on the contrary CCO2 emission was increased in the case of application to each building respectively.
MGT-CGS was more energy saving and less CCO2 emission system in operation stage, although in production stage MGT-CGS emits more CCO2 than the ordinary system. This CCO2 difference in production stage can be compensated in short time by the large annual CCO2 emission reduction in operation. The time was 0.43 years in terms of CCO2 pay back.