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NEEA NBI RTU Projects Review RTUG Nov 8, 2012. AirMax Indirect/Direct evap RTU-Idaho 3 gen unit (2 nd gen IDEC/Dx hybrid) Add-on to existing 5 ton RTU Variable Rate RTU Test (VRTUT) 5-ton RTUs NBI-L in Vancouver, WA + Fred Meyer-2 Idaho locations Trane Precedent Daikin McQuay Rebel

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neea nbi rtu projects review rtug nov 8 2012
NEEA NBI RTU Projects ReviewRTUG Nov 8, 2012
  • AirMax Indirect/Direct evap RTU-Idaho
    • 3 gen unit (2nd gen IDEC/Dx hybrid)
    • Add-on to existing 5 ton RTU
    • Variable Rate RTU Test (VRTUT) 5-ton RTUs
      • NBI-L in Vancouver, WA + Fred Meyer-2 Idaho locations
      • Trane Precedent
      • Daikin McQuay Rebel
      • AAON RQ
        • RTU physical model
evaporative idec rtu cooling research overview
Evaporative IDEC RTU Cooling Research Overview
  • Project installation – Bigelow Tea facility in Boise Idaho: long term field site for NEEA
  • Summer 2012 – good data for Aug/Sept
  • Savings projections: energy @ 50%(2,400 kWh/yr); demand @ 60% (3.6 kW)
  • Final report December
  • Potential to test next generation evap. unit summer 2013
airmax idec product 4 th gen unit
AirMax IDEC Product4th Gen Unit
  • Blower change: from external rotor motor 960 W single-speed(2500@ 0.5 inch ) to 1.1 kW blower internal rotor 3-speed (3000 CFM @ 0.5 inch  or 2500 CFM @ 1 inch )
  • Changed blower wheel from 450 mm with 130mm depth to 478mm with 170mm depth backward curve blower
  • Control board changes:
    • Added LCD to replace dipswitches
    • Runs the economizer or direct or direct /indirect as a 3-stages unit which saves water usage
    • Increased purge system control accuracy
    • TruPsych™ control boardfully integrated into the cabinet
    • Water coil and water pump redesigned completely to allow 100% winter drain down
    • Standard’ beige cabinet color
vrtut
VRTUT

Three high efficiency (code and better) units tested at NBI Lab, now in field measurement in Idaho 

The best performance was associated with the most efficient fan use

Short cycling losses not relevant if timed fan is used

ClimaCheck refrigeration diagnostics added

Topic 1

vrtut typical duty cycle trane
VRTUT-Typical Duty Cycle (Trane)

Topic 1

  • Typical fan power ~ 400-600 W
  • No short cycle loss if constant vent fan on
vrtut rebel duty cycle
VRTUT-Rebel Duty Cycle

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  • Typical supply fan power ~130 W
  • Most energy savings from low fan power
vrtut comparison of 3 rtus
VRTUT- Comparison of 3 RTUs

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  • Daikin McQuay Rebel performed about 30% better than base case (CAV-only) AAONRQaperformed worse than base case when excessive supply fan power was used
  • AAONRQbperformed slightly better than base case when supply fan power was minimized
rtu physical model
RTU Physical Model

Topic 1

  • NBI-L is closer to a ‘Field Site Lab’ with the capability of simulating constant internal loading and measuring thermal output necessary to develop an RTU model
  • RTU model uses inputs derived from published unit label data and unit site conditions
  • The conditioned space can be described by two parameters: internal loading parameter (BTU/day)
  • temperature dependency parameter (BTU/deg day)
physical model input parameters
Physical Model Input Parameters
  • Nominal unit size, tons
  • Neutral temperature
  • COP at neutral temp
  • Airflow, lbs/minute
  • Fixed supply fan run, hours
  • Fixed supply fan power, W
  • Standby power, W
  • Fan Power during compressor, W
  • Economizer effect, 0 to 100%
  • Minimum OSA fraction, % full flow
  • Thermal effect at space, BTU/deg day
  • Space gain, BTU/day

Topic 1

projects staff
Projects Staff

NBI

Mark Cherniack markc@newbuildings.org

Howdy Reichmuth howdy@gorge.net

Dan Harris dan@newbuildings.org

Mark Lyles markl@newbuildings.org

Adam Sherbaadam@newbuildngs.org

Idaho Design Lab

Brad Acker backer@uidaho.edu

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