Hi all,

I'm doing a LEED EAc1/ASHRAE 90.1-2004 Appendix G calculation where the
building is served by a district cooling scheme and the basecase
building is serviced by PTHP (ASHRAE 90.1 table G3.1.1A), i.e. the
basecase building is uses electrically powered DX coils compared to
purchased chilled water coils for the proposed building.

The problem I have is that the price per kWh of chilled water is very
close to the local price per kWh of electricity, which means that the
cooling energy cost of the proposed building ends up much larger - for
the PTHP system 1kWh of electricity gives something like 3kWh of
cooling, but the same money only gets 1kWh of cooling from the district
scheme, which makes it virtually impossible to get any LEED EAc1
credits. Has anyone else encountered this issue?

Thanks for your help,

Andy