Cooling Energy Savings –Melbourne Climate
21.10.14
Airius Thermal modelling for the Melbourne Climate using Air Pears.
Preliminary results.
Assumptions
The case study is a commercial shopping space with a 4 metre high ceiling and a 2,000 square metre floor area. The number and size of Airius Air Pear units has been selected based upon calculations provided by Airius Oceania P/L.
15 off Model 15 Airius Air Pear units have been considered as the destratification source. Each unit consumes 15 watts of power at 240 Volts/50 HZ.
The selected HVAC system for this building is a water-cooled chiller type which provides chilled water of 6 Deg. C for an air-handling (AHU) unit. The AHU fan is a Variable Air Volume (VAV) unit. An occupancy load of 200 people has been considered inside the building. (For more info please refer to the whole report)
All building fabric, lighting loads and HVAC systems for the different locations have been modeled under the 2013 NCC Section ‘J’ energy efficiency protocols.
Relevant and detailed climatic data for each location has been input into the facility and the examination is based on cooling periods only–when cooling is required inside the building.
Temperature Differences
Three temperature differences (floor to ceiling) of 4 Deg.C, has been considered for Melbourne in the nominated space.
Set Points
Fixed internal temperature set point of 23 Deg. C in summer and 20 Deg. C in winter.
Occupation levels
Occupation levels are considered as 200 persons in the space. One person per 10 sq. metres.
Air System Simulation Results for Melbourne -4 Deg C dT
Cooling Only-VAV System
2.21 Years payback
Month / HVAC Load(kWh)-Before / Supply Fan
(kWh)-Before / HVAC Load
(kWh)-After / Supply Fan
(kWh)-After
January / 44633 / 9366 / 36808 / 7530
February / 47511 / 8527 / 40341 / 6949
March / 39343 / 9140 / 30381 / 6484
April / 22456 / 8079 / 16185 / 6407
May / 0 / 0 / 0 / 0
June / 0 / 0 / 0 / 0
July / 0 / 0 / 0 / 0
August / 0 / 0 / 0 / 0
September / 0 / 0 / 0 / 0
October / 0 / 0 / 0 / 0
November / 32725 / 8596 / 25361 / 0
December / 38437 / 9087 / 30632 / 7006
Total / 225106 / 52795 / 179707 / 34376
Energy saving potential: 20.17% for chiller and 35% for AHU fan.
ROI
· 15 Air Pears @$800 each =$12,000.00
· 15 Ceiling Kits@$311 each = $4,665.00
· Install -$250 per unit =$3,750.00
Total =$20,415.00
· Power cost saved @ 20c kw/h =$9,079.00
Cooling Only ROI = 2.21 Years
Airius (Oceania) Pty Ltd
P.O Box 6282 Alexandria 2015
w airius.com.au