Code of Massachusetts Regulations
225 CMR - DEPARTMENT OF ENERGY RESOURCES
Title 225 CMR 23.00 - Massachusetts Front-end Amendments to the International Energy Conservation Code 2021 Massachusetts Stretch Energy Code - 2023 Commercial Amendments to IECC2021
Chapter 5 - [CE] EXISTING BUILDINGS
Section CC105 - MIXED-FUEL BUILDING PATHWAY

Universal Citation: 225 CMR 23.00 MA Code of Regs CC105

Current through Register 1531, September 27, 2024

CC105 Add Section CC105 as follows:

CC105.1 General. This section together with Section CC106 establishes additional minimum requirements for new mixed-fuel buildings.

CC105.1.1 Biomass Heating. New buildings using clean biomass heating systems may comply with this section without meeting CC105.3.1 and CC105.3.2. Buildings with any combustion equipment using biomass that does not meet the performance standards of clean biomass heating systems shall be deemed mixed-fuel buildings and shall comply with this section in full.

CC105.2 On-site Renewable Energy. New mixed-fuel buildings shall have equipment installed for on-site renewable energy with a rated capacity of not less than 1.5 W/ft2 (16.1 W/m2) multiplied by the sum of the gross conditioned floor area of the three largest floors.

Exception: Where the building site cannot meet the requirement in full with an on-site renewable energy system, the building site shall install a partial system sized to not less than 75% of the Potential Solar Zone Area.

CC105.3 Additional efficiency requirements. Additional efficiency requirements for compliance with this Section are set forth in Sections RC105.3.1 through RC105.3.3

CC105.3.1 More efficient HVAC equipment performance. Primary heating and cooling equipment shall meet the following efficiencies as applicable:
CC105.3.1 More Efficient HVAC Equipment Performance. Primary heating and cooling equipment shall meet the following efficiencies as applicable:
1. Space heating combustion equipment shall be rated at greater than or equal to 95 AFUE.

2. All refrigerant-based air conditioning equipment shall be a heat pump with greater than or equal to 10 HSPF rated heating performance and greater than or equal to 16 SEER rated cooling performance.

3. Ground source heat pump systems shall be rated at greater than or equal to 3.5 COP at design temperature.

For multiple cooling systems, all systems shall meet or exceed the minimum efficiency requirements in this section and collectively shall be sized to serve 100% of the cooling design load. For multiple heating systems, all systems shall meet or exceed the minimum efficiency requirements in this section and collectively shall be sized to serve 100% of the heating design load.

Exception: Clean biomass heating systems used as the primary heating system.

CC105.3.2 Reduced Energy Use in Service Water-heating . The hot water system shall meet one of the following efficiencies:
1. than or equal to 82 EF combustion equipment service\water-heating system.

2. Greater than or equal to 2.0 UEF electric service water-heating system.

3. Greater than or equal to 0.4 solar fraction solar water-heating system.

4. Clean biomass heating system supplied water-heating system.

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