Energy and Atmosphere (EA) Credit Strategy
In LEED v4.1 BD+C certification, the EA (Energy and Atmosphere) category is the core credit category for MEP systems. The prerequisite requires completion of Fundamental Commissioning of building energy systems to ensure HVAC, lighting and control systems operate per design requirements. Optimize Energy Performance (EA Credit) offers up to 18 points, earned by demonstrating through energy simulation that the design building saves energy versus the ASHRAE 90.1-2019 baseline building. 12% energy savings earns 4 points, 16% earns 6 points, 20% earns 8 points, 24% earns 10 points, 28% earns 14 points, 32% earns 16 points, and 36% or more earns 18 points. For a hotel building to achieve 36% energy savings, the following measures must be combined: high-efficiency heating and cooling source systems (COP above 6.5), heat recovery systems, variable air volume systems, high-efficiency LED lighting (LPD reduced by more than 25% versus the ASHRAE 90.1 baseline), free cooling utilization, renewable energy utilization, etc. Enhanced Commissioning earns 6 points—requiring, beyond fundamental commissioning, commissioning design review, construction document review and O&M staff training. On-site Renewable Energy offers up to 6 points—on-site renewable energy supply reaching 1% of building energy consumption earns 1 point, 5% earns 3 points, 10% earns 5 points, 20% or more earns 6 points. Green Power and Carbon Offsets earns 2 points—signing a green power contract of no less than 5 years covering at least 50% of building energy consumption.
Water Efficiency (WE) Credit Strategy
The MEP-related credits in the WE (Water Efficiency) category mainly include Water Use Reduction and Cooling Tower Water Use. The prerequisite requires indoor water use fixtures to save 20% versus the EPAct 1992 baseline. Optimize Water Efficiency (WE Credit) offers up to 12 points—30% water savings earns 2 points, 35% earns 5 points, 40% earns 8 points, 45% earns 10 points, 50% or more earns 12 points. Measures to achieve 50% water savings include: selecting Grade 1 water efficiency fixtures (toilets 3.0 L/flush, urinals 1.0 L/flush, faucets 3.5 L/min, showerheads 5.5 L/min); using waterless urinals; using water-efficient dishwashers and laundry equipment. Cooling Tower Water Use (WE Credit) earns 3 points—controlling cooling circulating water cycles of concentration at no less than 5 and providing automatic conductivity-based blowdown control. Water Metering (WE Credit) earns 1 point—installing permanent submeters covering at least 80% of expected water use, including domestic hot water, cooling tower makeup, irrigation water and laundry water. Water meters must be connected to the EMS for remote reading and data analysis.
Indoor Environmental Quality (EQ) Credit Strategy
The MEP-related credits in the EQ (Indoor Environmental Quality) category focus on indoor air quality and thermal comfort. The prerequisite Minimum IAQ Performance—demonstrating that ASHRAE 62.1-2019 ventilation rate requirements are met. Enhanced IAQ Strategies (EQ Credit) earns 2 points—installing CO2 sensors (at least 1 per floor) linked to the fresh air system for demand-controlled ventilation; installing PM2.5 sensors with F7 or higher filtration to ensure indoor PM2.5 concentration does not exceed 15 μg/m3; installing MERV13 (equivalent to F7) filters on all fresh air intakes. Low-Emitting Materials (EQ Credit) includes VOC limit testing for adhesives, sealants, coatings and flooring systems. Thermal Comfort Control (EQ Credit) earns 1 point—providing individual thermal comfort control for at least 50% of occupants (guest room thermostats, VAV terminal controllers, etc.). Thermal Comfort Verification (EQ Credit) earns 1 point—completing a post-occupancy thermal comfort satisfaction survey with satisfaction of no less than 80%. Daylight and Views (EQ Credit) relates to architectural and interior design but MEP must coordinate with dimming systems to achieve daylight-responsive control.
Innovation and Regional Priority Credits
The Innovation category in LEED v4.1 offers up to 6 points. Innovation Strategy (ID Credit) earns 5 points—innovative MEP strategies a hotel can propose include: real-time public display of building energy and water consumption (energy data display screens at the front desk), staff and guest energy-saving behavior incentive programs, use of next-generation low-GWP refrigerants (R1234ze or R290 with GWP not exceeding 150), and building load flexibility control participating in grid demand response, etc. LEED Accredited Professional (LEED AP) earns 1 point—at least one key participant on the project team holds a LEED AP credential. Regional Priority offers up to 4 points—selecting regional priority credits corresponding to the environmental priorities of the project location (e.g., in North China where smog is severe, focus on exterior window ventilation monitoring and air quality monitoring). MEP-related regional priority credits typically include: Water Efficiency, Renewable Energy and Enhanced IAQ. LEED certification has four levels: Certified (40-49 points), Silver (50-59 points), Gold (60-79 points) and Platinum (80 points and above). Five-star hotels typically target Gold certification (60 points and above), requiring the MEP team to participate in credit strategy planning from the early project stage.