EAc2 — REDUCE PEAK THERMAL LOADS
降低峰值热负荷

CREDIT 积分项 New Construction 1–5分 / Core and Shell 1–5分

影响领域：✓ Decarbonization 脱碳

INTENT 意图

To minimize demand on grid resources and improve the resilience of buildings.

最小化对电网资源的需求并提高建筑韧性。

REQUIREMENTS 要求

Achievement Pathways 达成路径	Points 分值
New Construction and Core and Shell	1–5
Option 1. Infiltration and Balanced Ventilation 渗透与平衡通风	2↓1
AND/OR 并且/或者
Option 2. Ventilation Energy Recovery 通风能量回收	1
AND/OR 并且/或者
Option 3. Thermal Bridging 热桥	1
AND/OR 并且/或者
Option 4. Peak Thermal Load Reductions 峰值热负荷削减	1–3
Path 1. Peak Load Intensity 峰值负荷强度	1–3
OR 或者
Path 2. ASHRAE 90.1 Trade-Off Methods 权衡法	1–3
OR 或者
Path 3. Energy Simulation 能源模拟	1–3

Pursue Options 2, 3, and/or 4 for a maximum of 5 points.
选择 Option 2、3 和/或 4 组合最高可得 5 分。

For all options, building envelope must meet ASHRAE 90.1 Section 5.5 or 5.6 per EAp2 version. Envelope efficiency shall not be traded off with other systems.

OPTION 1 Infiltration and Balanced Ventilation (2↓1 points)
渗透与平衡通风（2→1分，Residential为2分）

Balanced Ventilation 平衡通风

Design ventilation and exhaust airflows within 10% of each other and include a testing, adjusting, and balancing (TAB) report demonstrating balanced ventilation in commissioning scope.
通风和排风气流设计在彼此的10%以内，并提供调试范围内的平衡通风TAB报告。（不适用于C&S项目）

Infiltration 渗漏控制

Demonstrate measured air leakage of building envelope less than or equal to Table 1 below:

Building Conditioned Floor Area (CFA) 建筑面积	Pressure Test Conditions 压力测试条件	Maximum Air Leakage¹ 最大空气渗漏量（新建）	Major Renovation 重大改造
Building Conditioned Floor Area (CFA) 建筑面积	≥ 5,000 sq. ft. (465 sq. m.)	At pressure difference of 50 pascals (0.2 in H₂O)	0.13 cfm/sq. ft. (0.65 L/s/m²)	0.20 cfm/sq. ft. (1.0 L/s/m²)
At pressure difference of 75 pascals (0.3 in H₂O)	≥ 5,000 sq. ft. (465 sq. m.)	0.18 cfm/sq. ft. (0.90 L/s/m²)	0.27 cfm/sq. ft. (1.35 L/s/m²)
< 5,000 sq. ft. (465 sq. m.)	At 50 pascals (0.2 in H₂O)	1 ACH	1.5 ACH
< 5,000 sq. ft. (465 sq. m.)	At 75 pascals (0.3 in H₂O)	1.35 ACH	2 ACH

Residential (2 points): Meet NC requirements for balanced ventilation AND infiltration. Compartmentalize each dwelling unit. Perform blower door test per ANSI/RESNET/ICC 380.

OPTION 2 Ventilation Energy Recovery (1 point)
通风能量回收（1分）

Fan systems supplying outdoor air must have energy or heat recovery system with minimum 70% enthalpy recovery ratio or minimum 75% sensible heat recovery ratio. Provisions to bypass/control during moderate outside air conditions. Fan systems supplying <15% total outdoor air excluded.
C&S only: Fan systems must supply ≥50% of ventilation air required per ASHRAE Standard 62.1-2022.

OPTION 3 Thermal Bridging (1 point)
热桥控制（1分）

Comply with prescriptive thermal bridging requirements of ASHRAE 90.1-2022, Section 5.5.5(a), including Sections 5.5.5.1–5.5.5.5, without applying exceptions for climate zones 0–3.

OPTION 4 Peak Thermal Load Reductions (1–3 points)
峰值热负荷削减（1–3分）

Ventilation loads included in peak coincident loads. Use measured air leakage from testing for Paths 1–3.

PATH 1. PEAK LOAD INTENSITY (1–3 POINTS) / 峰值负荷强度（1–3分）

Points 得分	New Construction 新建建筑	Major Renovation 重大改造
1	16 Btu-h/sq. ft. (50 W/sq. m.)	20 Btu-h/sq. ft. (63 W/sq. m.)
2	12 Btu-h/sq. ft. (38 W/sq. m.)	15 Btu-h/sq. ft. (47 W/sq. m.)
3	8 Btu-h/sq. ft. (25 W/sq. m.)	10 Btu-h/sq. ft. (32 W/sq. m.)

Calculate using WUFI Passive Design Tool or Passive House Planning Package (PHPP).

PATH 2. ASHRAE 90.1 TRADE-OFF METHODS (1–3 POINTS) / ASHRAE 90.1权衡法（1–3分）

Envelope loads (1–2 points): % improvement vs baseline envelope performance factor per ASHRAE 90.1-2022 Appendix C. 10% → 1pt, 20% → 2pts.
Ventilation loads (1 point): Minimum 10% improvement in sum of peak heating + cooling loads vs TSPR reference design.

PATH 3. ENERGY SIMULATION (1–3 POINTS) / 能源模拟（1–3分）

Demonstrate Performance Index per ASHRAE 90.1-2019+ Appendix G PRM, replacing cost with peak heating + cooling load sum.

Performance Index	Points
0.5	1
0.4	2
0.3	3

LEED v5 Reference Guide | Pages 92–96