Multifamily Building Performance Program New Construction Component Simulation Guidelines

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Multifamily Building Performance Program

New Construction Component



Version 2.23

November 16JanuaryMarch 2008

Table of Contents




1. General Approach 3

2. Modifications to Appendix G Performance Rating Method 4

2.1 Performance Rating and Documentation Requirements (Sections G1.2 and G1.4) 4

2.2 Simulation Program (Section G2.1) 5

2.3 Design Model (Table G3.1.1) 7

2.4 Schedules (Table G3.1, Section 4) 8

2.5 Building envelope: Opaque assemblies (Table G3.1, Section 5) 10

2.6 Building envelope: Vertical Fenestration (Table G3.1 Section 5) 11

2.7 Lighting (Table G3.1 Section 6) 13

2.8 Thermal Blocks (Table G3.1 Sections 7, 8 and 9) 16

2.9 HVAC 16

2.10 Service Hot Water Systems (Table G3.1 Section 11) 17

2.10.1 Equipment Type and Efficiency 17

2.10.2 Hot Water Demand 17

2.10.3 Hot Water Distribution System - TBD 20

2.11 Receptacles and other plug loads (Section G 3.1.12) 20

2.13 Minimum outdoor vVentilation and iInfiltration 25

2.14 HVAC Distribution Losses 29

2.15 Fans 30

2.16 Energy Rates 33



  1. SCOPE

This document contains the methodology for calculating a performance rating for high-rise multifamily buildings in the NYSERDA Multifamily Building Performance Program – New Construction Component (“Program”). The document is to be used by New York Energy $martSM PerformacePerformance Partners (“Partners”) to calculate a performance rating of the proposed design. It may be shared with the developer or property owner if requested.

    1. Ensure a consistent simulation methodology from building to building and from Modeling PartnerPartner to Modeling PartnerPartner based on ASHRAE Standard 90.1-2004 Appendix G (“Appendix G”) to evaluate energy efficiency of high-rise multifamily buildings.

    2. Ensure a consistent approach for handling components that are not included in Appendix G, or included without the level of detail needed to support the simulation process.

    3. Address those issues that Appendix G leaves for the “rating authority” to decide. The “rating authority” is NYSERDA for this Program.

    4. Ensure that the rating process facilitates energy efficient design from the beginning of the design process.

1. General Approach

Background (Informative)

A comparison of national standards (ASHRAE Standard 90.1, ASHRAE Standard 62.1, etc.) to state and local codes (Energy Conservation Construction Code of New York State (ECCC NYS), NYC Building Code, etc.) uncovered differences between national and local requirements.

For example, the ASHRAE 90.1 minimum surface R-value requirements differ from requirements outlined in Section E802.2 of ECCC NYS. The required envelope parameters in both documents depend on climate zone, but NYS is covered by three climate zones in ASHRAE 90.1 and by seven climate zones in ECCC NYS.

Ventilation requirements are another example of differences between national and local requirements. ASHRAE Standard 62.1 calls for fixed ventilation air flow for residential kitchens (100 CFM intermittent or 25 CFM continuous per kitchen). The New York City Building Code on the other hand requires that the ventilation rate be proportional to the kitchen area (2 CFM/SF). ASHRAE Standard 90.1 Section requires heat recovery for certain ventilation systems. There is no such requirement in the ECCC NYS.
Energy Star is a national label. It is important that the energy rating calculated in this Program be consistent with national methodologies. In order to achieve this, the components in the baseline building should comply with applicable national standards.

Program Requirements

Baseline design components

1. Components in the baseline building shall comply with ASHRAE Standard 90.1-2004 and other applicable national standards. The most current version of each standard as of 2004 shall be used.

2. End uses that do not exist in the proposed building can not be included in the baseline simulation, unless explicitly required by Appendix G and these Simulation Guildines. For example, if the parking lot in the proposed design is not lighted, then parking lot lighting power allowance can not be added to the baseline energy consumption.

Proposed design components

Components in the proposed design simulation must reflect the actual building components, except where otherwise specified in this document. Components in the proposed design must comply with the Minimum Performance Standards of this Program as well as applicable state and local codes.

If components are not installed during construction, but are required in lease or sales agreement (for example appliances or room air conditioners), then such components may be modeled in the proposed design, contributing to the performance rating, subject to review and approvialapproval of lease/sales agreement requirement by NYSERDA.
Simulation Methodology

  1. The baseline and proposed design of buildings in the scope of ASHRAE Standard 90.1 shall be simulated per ASHRAE Standard 90.1 Appendix G and as described in this document.

  2. Baseline and proposed design models shall include only residential and residential-associated spaces in the building. Residential associated spaces are: corridors; stairs; lobbies; rooms used for laundry, exercise, residential recreation, or otherwise used exclusively by residents, building staff, and their guests, and; offices used by building management, administration or maintenance. All other spaces, such as commercial and retail spaces, shall not be included in the simulations or any other aspect of the Program

  3. Separate baseline and proposed design models shall be created for each non-identical building in the project. The performance rating shall be calculated individually for each such building.
  4. In some instances, the Simulation Guidelines may include values that do not apply to the input structure of your simulation tool. When this occurs, either use approximate method suggested in the User Manual for your tool, or disregard the non-applicable inputs. Such inputs are included for the programs that may need them.

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