Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
When going for DES v2 Option 1, you need to model both the Proposed and Baseline buildings' energy sources as purchased energy, as explained in section 2.4.1.1 of the DES v2 Guidance.
The usual way to implement this option is by modeling a constant efficiency boiler with 100% efficiency on the hot water loop, and then applying a purchased heat energy rate to the estimated boiler energy. The exact implementation will differ depending on which modeling tool you use. Note that if your Baseline building uses the baseline system type 3, you will have to modify it according to Table 3 (page 11) of the DES v2 Guidance to make it compatible with a hot water loop.
Now, with regards to the actual hot water loop parameters, DES v2 guidance says that "any system parameters not specifically referenced in Table 3 are modeled as specified in Appendix G", so you need to follow requirements of sections G3.1.3.3 through G3.1.3.5 for your baseline model. For your Proposed building, define the supply & reset temp and pump power as per you project specs.
Also, keep in mind that when going for DES v2 Option 1 you have to calculate your purchased energy rate as outlined in section 2.4.2.1 of the DES v2 Guidance, under "District Hot Water Rate". You need to use these rates, which consider some default efficiencies for the District Heating and District Cooling plants, and shouldn't use the rate given by your District Heating provider.
Finally, be aware that you can only claim a maximum of 12 EAc1 credit points when selecting this option with LEED CS v2009, as per Table 1 of the same document.
| | 2 | No.2 Revision |
When going for DES v2 Option 1, you need to model both the Proposed and Baseline buildings' energy sources as purchased energy, as explained in section 2.4.1.1 of the DES v2 Guidance.
The usual way to implement this option is by modeling to model a constant efficiency boiler with 100% efficiency on the hot water loop, and then applying apply a purchased heat energy rate to the estimated boiler energy. The exact implementation will differ depending on which modeling tool you use. Note that if your Baseline building uses the baseline system type 3, you will have to modify it according to Table 3 (page 11) of the DES v2 Guidance to make it compatible with a hot water loop.
Now, with regards to the actual hot water loop parameters, DES v2 guidance says that "any system parameters not specifically referenced in Table 3 are modeled as specified in Appendix G", so you need to follow requirements of sections G3.1.3.3 through G3.1.3.5 for your baseline model. For your Proposed building, define the supply & reset temp and pump power as per you project specs.
Also, keep in mind that when going for DES v2 Option 1 you have to calculate your purchased energy rate as outlined in section 2.4.2.1 of the DES v2 Guidance, under "District Hot Water Rate". You need to use these rates, which consider some default efficiencies for the District Heating and District Cooling plants, and shouldn't use the rate given by your District Heating provider.
Finally, be aware that you can only claim a maximum of 12 EAc1 credit points when selecting this option with LEED CS v2009, as per Table 1 of the same document.
| | 3 | No.3 Revision |
When going for DES v2 Option 1, you need to model both the Proposed and Baseline buildings' energy sources as purchased energy, as explained in section 2.4.1.1 of the DES v2 Guidance.
The usual way to implement this option is to model a constant efficiency boiler with 100% efficiency on the hot water loop, and then apply a purchased heat energy rate to the estimated boiler energy. The exact implementation will differ depending on which modeling tool you use. Note that if your Baseline building uses the baseline system type 3, you will have to modify it according to Table 3 (page 11) of the DES v2 Guidance to make it compatible with a hot water loop.
Now, with regards to the actual hot water loop parameters, DES v2 guidance says that "any system parameters not specifically referenced in Table 3 are modeled as specified in Appendix G", so you need to follow requirements of sections G3.1.3.3 through G3.1.3.5 for your baseline model. For your Proposed building, define the supply & reset temp and pump power as per you project your project's specs.
Also, keep in mind that when going for DES v2 Option 1 you have to calculate your purchased energy rate as outlined in section 2.4.2.1 of the DES v2 Guidance, under "District Hot Water Rate". You need to use Use these rates, which consider some default efficiencies for the District Heating and District Cooling plants, and shouldn't use the rate given plant, instead of those provided by your District Heating provider.
Finally, be aware that you can only claim a maximum of 12 EAc1 credit points when selecting this option with LEED CS v2009, as per Table 1 of the same document.
| | 4 | No.4 Revision |
When going for DES v2 Option 1, you need to model both the Proposed and Baseline buildings' energy sources as purchased energy, as explained in section 2.4.1.1 of the DES v2 Guidance.
The usual way to implement this option is to model a constant efficiency boiler with 100% efficiency on the hot water loop, and then apply a purchased heat energy rate to the estimated boiler energy. The exact implementation will differ depending on which modeling tool you use. Note that if your Baseline building uses the baseline system type 3, you will have to modify it according to Table 3 (page 11) of the DES v2 Guidance to make it compatible with a hot water loop.
Now, with regards to the actual hot water loop parameters, DES v2 guidance says that "any system parameters not specifically referenced in Table 3 are modeled as specified in Appendix G", so you need to follow requirements of sections G3.1.3.3 through G3.1.3.5 for your baseline model. For your Proposed building, define the Baseline supply & temperature, temperature reset temp and pump power as per your project's specs.should be based on actual Hot Water loop conditions in the Proposed Case. I can't find this exact reference in the DES v2 Guidance document, but these are the instructions written in the Revised Section 1.4 spreadsheet.
Also, keep in mind that when going for DES v2 Option 1 you have to calculate your purchased energy rate as outlined in section 2.4.2.1 of the DES v2 Guidance, under "District Hot Water Rate". Use these rates, which consider some default efficiencies for the District Heating plant, instead of those provided by your District Heating provider.
Finally, be aware that you can only claim a maximum of 12 EAc1 credit points when selecting this option with LEED CS v2009, as per Table 1 of the same document.
