Airmanager Industrial HVAC retrofit results July Location Description:

Transcription

1 Airmanager Industrial HVAC retrofit results July 2013 Location Description: Subject location is a waste composting facility in the UK that turns thousands of tons of kitchen and garden waste every year into a useful and completely natural soil-improver for local farms. The facility is a waste processor and recycler and is used to further divert large amounts of waste away from landfills. It is capable of processing up to 45,000 tons per year: 30,000 tons is green garden waste and 15,000 tons is kitchen food waste. The facility s composting tunnels are MIDAS aerated and are fabricated from pre-cast concrete elements. Combined with the door systems, the configuration allows waste to be composted in a fully contained batch process with control over air supply, leachate containment and odor management. Air Handling System: Pre and Post AIRMANAGER MDT testing focused on Reception Building Reception Building-Currently calibrated for 2 air changes per hour. The majority of air extraction is achieved by a number of 5.5kW fans diverting air into the Stage 1 composting tunnels. The remaining air is exhausted directly to the reception biofilterand carbon filter via a 18.5kW fan. Outside emission is achieved via a 15m stack and additional 4kW fan. Two dampers are installed to allow air entry into the reception building when required. The optimal airflow for the Reception Building is 6,000 m 3 /hr. Old Filtration System: Reception Building Biofilter comprising of the following: A 200mm thick hollow core plenum placed across the floor of the biofilter. A geotextile placed across the plenum to maintain its integrity. Woodchip media -filled to a depth of 1.5m. A separate, stand alone, carbon filter containing activated carbon. Air is fed into the base of the biofilterwhich is 20m long, 7.5m wide and 1.8m deep. The approximate retention time is 27 seconds. AIRMANAGER MDT Implementation: The Biofiltersystem s carbon filter was completely removed and replaced with a MDT (Molecular Disruptive Technology) system. The MDT box was easily retrofitted into the existing ducting without any major modification. A 230V cord was plugged into an newly dropped outlet to power the MDT pulling less than 1 amps at 75W. A pre and post H.A.F. filter were outfitted with minor modification to the ducting along with air flow sensors. The retrofit was successful without any major changes to duct weight or dimensions. 1 24/08/2015

2 Pre and Post AIRMANAGER Installation Testing: Instruments: Air Velocity Meter Results: Below IVC BioFilter exhaust fan performance testing Client: Date: 9th July 2013 Project: Ductwork diameter (mm) Ductwork CSA (m2) Test date before carbon granules removed 800 System: Location: Reference: Drive frequency Speed Duct presssure Duct velocity Air flow Air flow Manufacturer RHF Manufacturer AmTecs Hz % Pa m/s m3/s m3/hr Type Centrifugal Type AMI 180M4 Model BW8 Model 18.5 Kw 25 50% ,886 Size 725 T4 Supply Via Inverter % ,333 Test date after carbon ganules removed Drive frequency Speed Duct presssure Duct velocity Air flow Air flow Hz % Pa m/s m3/s m3/hr 25 50% ,124 FAN MOTOR Serial Number 711/8371/1 Serial number Performance Biofilter extract After Carbon Filter Before carbon media removal After carbon media removal Inverter Frequency (Hz) Inlet pressure (Pa) Outlet pressure (Pa) Total pressure (Pa) Outlet duct velocity (m/s) Flow volume (m3/s) % ,267 Carried out by: Position: Engineer Company: % ,810 Date: 9th July 2013Signature: KiloWatt Hour Impact Analysis - July 2013 to September 2013 : The kw analysis was conducted on the Reception Building s 18.5kW unit (Note: the unit is a variable torque so these loads increase with speed and are usually associated with a centrifugal fan like the one here). Under pre-installation conditions, the motor was running at 100% capacity and ticking at 12kW. The average hourly energy consumption of this unit was approximately 18kW. The unit had to consume the maximum amount of energy to meet the optimal volume of airflow for the Reception Building at 6,000m 3 /hr. At 100% fan output, the volume was 6,333m 3 /hr. noted in the results above. After the MDT installation, the volume of air at 100% fan output increased to 20,810m 3 /hr. Since this level of airflow was overkill, the fan speed was reduced to lowest variable speed 25 Hz consuming an average of 12.9kW or approximately a 30% decrease in kwh consumption. Still, the airflow exceeded 12,000m 3 /hrand was putting unwanted stress on the ducting components. 2 24/08/2015

3 Cont -The facility decided to change the motor from 18.5kW (25HP) to 9kW (10HP). The reception building unit is now pulling an average of 6.85kW pushing above 8,000m 3 /hr. Savings Pre-Installation Avg 18 kwh at $0.11/kWh annualized = $17,344 Post-Installation Avg 6.85kWh at $0.11/kWh annualized = $6,600 Average Total Savings on one install 61% 3 24/08/2015

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