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I have a LEED project that I am evaluating using the Performance Rating Method in Appendix G of ASHRAE 90.1. This building meets the space, height, and primary heating criteria for the baseline model to have HVAC system 5, Packaged DX VAV w/HW reheat. As such the cooling is done via DX cooling coils and there is no CHW loop. However, there is a process cooling load for some laboratory equipment within the building design that requires CHW for cooling. How do I accomplish this with the baseline model? I see two options.

1. Use HVAC system 7 instead of HVAC system 5 and follow appendix G accordingly.
2. Keep using HVAC system 5 for the space conditioning and model a chw loop only for the process load using a minimally compliant water cooled chiller and pumping power according to appendix G.

I'm leaning towards option 1. If anyone has experience with this issue in their LEED submission I would be grateful to hear from you.

I have a LEED project that I am evaluating using the Performance Rating Method in Appendix G of ASHRAE 90.1. This building meets the space, height, and primary heating criteria for the baseline model to have HVAC system 5, Packaged DX VAV w/HW reheat. As such the cooling is done via DX cooling coils and there is no CHW loop. However, there is a process cooling load for some laboratory equipment within the building design that requires CHW for cooling. How do I accomplish this with the baseline model? I see two options.

1. Use HVAC system 7 instead of HVAC system 5 and follow appendix G accordingly.
2. Keep using HVAC system 5 for the space conditioning and model a chw loop only for the process load using a minimally compliant water cooled chiller and pumping power according to appendix G.

I'm leaning towards option 1. If anyone has experience with this issue in their LEED submission I would be grateful to hear from you.

I have a LEED project that I am evaluating using the Performance Rating Method in Appendix G of ASHRAE 90.1. This building meets the space, height, and primary heating criteria for the baseline model to have HVAC system 5, Packaged DX VAV w/HW reheat. As such the cooling is done via DX cooling coils and there is no CHW loop. However, there is a process cooling load for some laboratory equipment within the building design that requires CHW for cooling. How do I accomplish this with the baseline model? I see two options.

1. Use HVAC system 7 instead of HVAC system 5 and follow appendix G accordingly.
2. Keep using HVAC system 5 for the space conditioning and model a chw loop only for the process load using a minimally compliant water cooled chiller and pumping power according to appendix G.

I'm leaning towards option 1. If anyone has experience with this issue in their LEED submission I would be grateful to hear from you.