HVAC Equipment Sizing Strategies: Taking Advantage of High-Performance Buildings. EEBA Excellence in Building Conference. Building Science Corporation
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1 HVAC Equipment Sizing Strategies: Taking Advantage of High-Performance Buildings EEBA Excellence in Building Conference October 24, PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 1 of 17
2 Other Resources Proctor Engineering Group (San Rafael, CA) Article: Bigger is Not Better: Sizing Air Conditioners Properly Florida Solar Energy Center (FSEC) PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 2 of 17
3 Benefits of Right-sizing Equipment Reduces short cycling (lower efficiency) More moisture removal (latent load) Reduces electrical peak load Smaller and simpler HVAC system easier to fit inside conditioned space Comfort & noise blast of cold air effect & mixing Lower equipment cost recoup costs of energyrelated upgrades PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 3 of 17
4 Reasons for Equipment Oversizing Rule of thumb sizing strategies (e.g., 400 sf/ton) Tradition always done this way Avoiding callbacks (covers up problems with underperforming equipment) Room for expansion or for unforeseen loads Oversizing from rule of thumb is worse in buildings with high-performance envelopes PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 4 of 17
5 So how is equipment sized correctly? Load calculation: ACCA Manual J Computes heat flow in/out of the building at design conditions (1% design temperature) Manual J has safety factors built in fudging above that load is unnecessary PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 5 of 17
6 Components of a load calculation Regular heat conduction walls, roofs, floors Windows add radiation (sunlight) Air movement infiltration & ventilation Latent load moisture/humidity to be removed by cooling system PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 6 of 17
7 Heat conduction U x A x ÄT = heat flow through wall/roof/etc U = 1 / R-value (e.g., R-30 A = area ÄT = temperature difference U=0.033) Be sure that upgraded building components (e.g., 2x6 walls, insulating sheathing) are accounted for PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 7 of 17
8 Windows 1/3 to 2/3 of cooling load typically from windows U-value (insulation) SHGC (solar heat gain coefficient) or SC (shading coefficient) Shading external and internal House orientation if known, use it. PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 8 of 17
9 Air movement Infiltration unintentional air movement. Measured in ACH (air changes per hour) Ventilation intentional air movement. Measured in CFM (cubic feet per minute) Well-sealed buildings have lower infiltration 0.1 ACH measured in Building America houses Therefore lower infiltration loads. PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 9 of 17
10 Other Items Latent load don t use 30% rule of thumb Duct losses vary with location and insulation level. Are zero with ducts inside conditioned space. Swing multiplier used to account for equipment capacity loss at high outdoor temperatures. Sometimes used incorrectly as general fudge factor. PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 10 of 17
11 Equipment Resizing Example (Northern CA) Modifications included: Plan sf (1 story) Plan sf (2 story) Spectrally-selective windows Unvented roof/ducts inside conditioned space Tighter building envelope Thicker wall insulation PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 11 of 17
12 Sizing equipment below Manual J Loads: Las Vegas, NV (Arbor View) kbtu/hr Latent Sensible Equipment 1787 Calc. Load 2260 Equipment 2260 Calc. Load PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 12 of 17
13 Arbor View Plan 2260 On-Time Frequency Frequency of cooling on-time Number of 0.5 h intervals Lot 6 Arbor View Percent of 0.5 h intervals On-time fraction 0 PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 13 of 17
14 Arbor View Plan 2260 Runtime vs. ÄT Cooling On-time fraction vs. Outside to Inside Temp. Diff. Cooling On-time fration Lot 6 Arbor View Temperature Difference (F) PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 14 of 17
15 Problems Seen When Resizing Equipment Customer perceptions Why do I have 3 tons when my neighbor has 5 tons? Customer complaint Why is my equipment running so long? Its never done that before. Greater vulnerability to poorly installed systems duct leakage, improper refrigerant charge, or low airflow. Higher recovery times from deep setbacks instruct customers to set & forget thermostats. PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 15 of 17
16 Window Effects on Loads & Efficiency Glazing Ratios vs. Energy Star % 15.0% 17.5% 20.0% 22.5% 25.0% Floor Glazing Rest Wall Glazing Rest Wall Glazing PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 16 of 17
17 Window Effects on Loads & Efficiency Cooling Load vs. Window Area 80.0 Design Load (kbtu/hr) Window area (sf rough opening) PR-0110: HVAC Equipment Sizing Strategies Taking Advantage of High-Performance Buildings Page 17 of 17
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