Quality install testing procedures for forced air systems
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Transcript of Quality install testing procedures for forced air systems
![Page 1: Quality install testing procedures for forced air systems](https://reader034.fdocuments.us/reader034/viewer/2022051400/55a18bcf1a28abd5418b47ec/html5/thumbnails/1.jpg)
Quality Install Testing Procedures for Forced Air
Systems
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Quality Installation: Outcomes
• Installation practices have links to • Comfort• Humidity Levels (dehumidification)• Reduced Utility Consumption • Reduced Utility Consumption • Indoor Air Quality
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Why Test?
• SEER reduced when airflow not correct• High Static = more power draw on ECMs• ECMs start to draw more power at .8” wc• Must know system performance to • Must know system performance to
consider ECM upgrade
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Why Test?
• Coils, filters, ductwork (flexible lines worst), registers all add to Total External Static Pressure (TESP)
• High static pressure makes more noise• High static pressure makes more noise• Flow directly effects comfort• No test is just a guess
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Two Main Tests
• Total External Static Pressure• Air Flow CFM
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What is Rated TESP?
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What is TESP?
All components add resistance. Too much
restricts flow.
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Testing TESPStatic Pressure Tube and Manometer
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Testing TESPPitot Tube and Manometer
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Testing TESP (Heat Only)
• TESP = top of heat exchanger to bottom of blower (after filter)
• Pressure Drop = • Pressure Drop = change over a distance (AC coil, filter, etc.
• Check rating (includes coil? Filter?)
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Testing TESP Rooftop units
• TESP = Supply and return
• Pressure Drop = change over a distance change over a distance (AC coil, filter, etc.
• Rated TESP, coil included in package units.
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Testing TESP
• TESP = Add two numbers together
• Pressure Drop = subtract numbers subtract numbers (ignore ± sign)
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TESP Results
• Think Golf and Blood Pressure• Lower is better• High numbers indicate a problem• And a need for…more practice, exercise • And a need for…more practice, exercise
and tweaking the system
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Example w/no and dirty filter
• 10 After coil • 4 Before Filter• 10 After Filter• 70 Before Coil
• 6 After coil • 4 Before Filter• 52 After Filter• 43 Before Coil • 70 Before Coil
• **TESP = 80• **∆P Coil = 62• ∆P Filter = 2
• 43 Before Coil • ***TESP total = 95• ∆P Coil = 38• **∆P Filter = 48
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Testing Air Flow (CFM)
• Static Pressure affects air flow• Air flow determines efficiency• Need air flow to set refrigerant• Need 400~ cfm per ton of cooling• Need 400~ cfm per ton of cooling• Need to know # of tons
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Testing Air FlowTrue Flow Meter®
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True Flow Meter®
• Energy Conservatory, MN Manufacturer• Advantages: very accurate, fairly easy to
set up• Disadvantages: Equipment can be • Disadvantages: Equipment can be
expensive, needs filter slot that fits plates, can be effected by poor duct design
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True Flow Meter®
• Install in filter slot• Meter automatically averages flow rates• Needs manometer (pressure gauge)
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Testing Air FlowHot Wire or Mini-Vane Anenometer
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Hot Wire or Mini Vane
• Advantages: Fast and east to use, accurate (when compared to True Flow meter)
• Disadvantages: Cost, need linear section • Disadvantages: Cost, need linear section of duct
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Hot Wire or Mini Vane
• Drill holes in duct• Take readings• Meter automatically calculates flow rates
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Testing Air FlowHotwire or Mini-Vane Anenometer
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TESP
• Advantages: Low cost, Quick and easy (if table available), good for troubleshooting
• Disadvantages: Fan tables sometimes not available (can use generic), duct available (can use generic), duct configurations may cause turbulence
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TESP
• Take readings• Know fan speed setting, rated TESP• Match readings off fan table to find CFM
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Fan Table
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Potential Problems Found
Restrictive filter (up to 50% drop in flow) Restrictive designer registers
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Potential Problems Found
Dirty AC Coils Owner did not know it existed
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Potential Problems Found
Dirty Fan Blades Leaky Ductwork
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Possible Solutions
• Less restrictive filters• Regular filter changes, maintenance • Curved ductwork, turning vanes• Registers with free air • Registers with free air • Smooth ductwork, not flex duct• Proper sizing of ductwork• Sealing ductwork
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Challenges
• Additional testing often means more cost• Additions to ductwork can add cost to
proposal• “Low Bid” vs. most responsible bid• “Low Bid” vs. most responsible bid• Customer education• Contractor education
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Benefits
• Energy Savings (that is expected and predicted)
• Increased Comfort• Better customer service• Better customer service
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Thank You
Bruce Stahlberg, CEMAffordable Energy Solutions, Inc.
Minneapolis, MN Minneapolis, MN