5. Multifamily Title 24
Starting in EnergyPro 9.0 you will find three TDV scores when doing a compliance calculation. A TDVe score which represents the efficiency of the building design and includes all end uses with the exception of PV and Battery. A TDVt score which is the building efficiency score including the savings contribution of PV and Batteries, and a Sourcet score, a Source emissions score that is similar to the TDVt score and includes all end uses and factors in the Green House Gas emissions that result from the gas and electricity that is consumed to run the building. In the case of buildings with gas appliances, you can expect your proposed Sourcet emissions score to be high. For the 2022 Energy Code, New Construction projects are required to comply with all three scores.
You can review two sample files we provide, the Multifamily Example.bld, we also provide a file Multfamily Electric.bld Both are modeled at the Plant level of the tree, Domestic Hot Water tab. The inputs for the CHPWH are at the bottom section of the input screen, you can choose the type of Heat Pump, quantities, etc, as well as tank volumes, and supplemental loop capacities, tank locations and locations of condensers. The water heater input at the top of the screen is used to supply Nonresidential spaces. You CANNOT assign those spaces to the CHPWH, CBECC does not allow for that circumstance, so you will have to assign those spaces to a standalone WH. Create a dummy electric WH if necessary.
For mini-split, multi-split and VRF systems the CEC Compliance Manager simulates these internally as a system equivalent to the standard minimum efficiency split system A/C with a fully ducted system in the attic, thus affording no credit towards compliance. When inputting these systems, each Indoor unit should be input at the System level of the Tree as its own System (using the efficiencies from the Outdoor unit), with a corresponding Zone, thus allowing for the necessary rater field verification. The Outdoor unit should not be input. At the Central System library, cooling tab, the unit should be identified as Mini-Split, Multi-Split or VRF, to ensure correct reporting.
You have the option to take additional compliance credit for these systems as a VCHP (Variable Capacity Heat Pump) system. In the case of a VCHP, which requires an indoor unit installed in each habitable room over 150 sqft, we offer the checkbox at the System level of the Building Tree, Residential tab. Note however that when using this feature, changing the efficiency will not impact the VCHP credit.
You will see the VCHP verification criteria on the CF1R under HERS Feature Summary, and a new section “Variable capacity heat pump compliance option – HERS Verification” on the CF1R, including a comprehensive list of HERS measures for verification. Our sample file Single Family Mini-split Example demonstrates this feature.
Appendix B of the VCHP CEC staff report is entitled VCHP Compliance Credit—Eligibility Verification Protocols. This document describes the criteria to be met and is available from the newly established CEC website dedicated to VCHP.
These occupancies are listed as exempt lighting under Section 140.6 of the code, and as such the lighting does not appear on the reports, nor does it affect any calculated results. Basically the lighting is subject to mandatory measures, but the quantity of lighting is unregulated and thus not reported.