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I am studying annual energy costs of two baseline models for a LEED residential building, PTAC VS PTHP. This is a 9 story building in Washington, DC and to simplify the process just created a bulk model per ASHRAE 90.1-2007 energy modeling requirements. Keeping everything the same in two models except the HVAC system, simulation results per eQUEST version 3.65, built 7163 indicate changing PTAC to PTHP will increase the annual energy cost from $219,597 to $236,476 (-8.1% annual energy cost savings). This was the results that I was expecting based on my previous experience. Surprisingly, when I use OpenStudio-1.12.0.ef50b89958-Win64, simulation results indicate changing PTAC to PTHP will decrease the annual energy cost from $102,130 to $117,449 (13% annual energy cost savings). In short: In eQUEST, changing PTAC to PTHP = 8.1% annual energy cost increase In OpenStudio, changing PTAC to PTHP = 13% annual energy cost savings following are links to files of this experience. I would appreciate it is someone would review these models and let me know the reason(s) of this contradiction. http://climaticdesign.net/wp-content/uploads/2016/07/PTAC2PTHP-Test-eQUEST.rar

http://climaticdesign.net/wp-content/uploads/2016/07/PTAC2PTHP-Test-OpenStudio.rar

I am studying annual energy costs of two baseline models for a LEED residential building, PTAC VS PTHP. This is a 9 story building in Washington, DC and to simplify the process just created a bulk model per ASHRAE 90.1-2007 energy modeling requirements. Keeping everything the same in two models except the HVAC system, simulation results per eQUEST version 3.65, built 7163 indicate changing PTAC to PTHP will increase the annual energy cost from $219,597 to $236,476 (-8.1% annual energy cost savings). This was the results that I was expecting based on my previous experience. Surprisingly, when I use OpenStudio-1.12.0.ef50b89958-Win64, simulation results indicate changing PTAC to PTHP will decrease the annual energy cost from $102,130 to $117,449 (13% annual energy cost savings). In short: In eQUEST, changing PTAC to PTHP = 8.1% annual energy cost increase In OpenStudio, changing PTAC to PTHP = 13% annual energy cost savings following are links to files of this experience. I would appreciate it is someone would review these models and let me know the reason(s) of this contradiction. contradiction.

http://climaticdesign.net/wp-content/uploads/2016/07/PTAC2PTHP-Test-eQUEST.rar

http://climaticdesign.net/wp-content/uploads/2016/07/PTAC2PTHP-Test-OpenStudio.rar

I am studying annual energy costs of two baseline models for a LEED residential building, PTAC VS PTHP. This is a 9 story building in Washington, DC and to simplify the process just created a bulk model per ASHRAE 90.1-2007 energy modeling requirements. Keeping everything the same in two models except the HVAC system, simulation results per eQUEST version 3.65, built 7163 indicate changing PTAC to PTHP will increase the annual energy cost from $219,597 to $236,476 (-8.1% annual energy cost savings). This was the results that I was expecting based on my previous experience. Surprisingly, when I use OpenStudio-1.12.0.ef50b89958-Win64, simulation results indicate changing PTAC to PTHP will decrease the annual energy cost from $102,130 to $117,449 (13% annual energy cost savings). In short: In eQUEST, changing PTAC to PTHP = 8.1% annual energy cost increase In OpenStudio, changing PTAC to PTHP = 13% annual energy cost savings following are links to files of this experience. I would appreciate it is someone would review these models and let me know the reason(s) of this contradiction.

http://climaticdesign.net/wp-content/uploads/2016/07/PTAC2PTHP-Test-eQUEST.rar

http://climaticdesign.net/wp-content/uploads/2016/07/PTAC2PTHP-Test-OpenStudio.rar

I am studying annual energy costs of two baseline models for a LEED residential building, PTAC VS PTHP. This is a 9 story building in Washington, DC and to simplify the process just created a bulk model per ASHRAE 90.1-2007 energy modeling requirements. Keeping everything the same in two models except the HVAC system, simulation results per eQUEST version 3.65, built 7163 indicate changing PTAC to PTHP will increase the annual energy cost from $219,597 to $236,476 (-8.1% annual energy cost savings). This was the results that I was expecting based on my previous experience. Surprisingly, when I use OpenStudio-1.12.0.ef50b89958-Win64, simulation results indicate changing PTAC to PTHP will decrease the annual energy cost from $102,130 to $117,449 (13% annual energy cost savings). In short: short:

In eQUEST, changing PTAC to PTHP = 8.1% annual energy cost increase increase

In OpenStudio, changing PTAC to PTHP = 13% annual energy cost savings savings

following are links to files of this experience. I would appreciate it is someone would review these models and let me know the reason(s) of this contradiction.

http://climaticdesign.net/wp-content/uploads/2016/07/PTAC2PTHP-Test-eQUEST.rar

http://climaticdesign.net/wp-content/uploads/2016/07/PTAC2PTHP-Test-OpenStudio.rar

I am studying annual energy costs of two baseline models for a LEED residential building, PTAC VS PTHP. This is a 9 story building in Washington, DC and to simplify the process just created a bulk model per ASHRAE 90.1-2007 energy modeling requirements.

Keeping everything the same in two models except the HVAC system, simulation results per eQUEST version 3.65, built 7163 indicate changing PTAC to PTHP will increase the annual energy cost from $219,597 to $236,476 $219,597 to $236,476 (-8.1% annual energy cost savings). This was the results that I was expecting based on my previous experience.

Surprisingly, when I use OpenStudio-1.12.0.ef50b89958-Win64, simulation results indicate changing PTAC to PTHP will decrease the annual energy cost from $102,130 to $117,449 $102,130 to $117,449 (13% annual energy cost savings).

In short: