Introduction
Related work
Methods
Building description
Main energy use categories
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HVAC: (refrigeration and no central heating; the common HVAC acronym is used) cools public and office spaces during opening hours and night functions 365 days every year and cools 4 ML of aquarium water as required and a 20-kL chilled water TES.
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Machinery: filtration pumps that operate continuously, compressors running sporadically (for wave machine and SCUBA diving) and a reverse osmosis system operating seasonally.
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Lighting: standard room lighting, special display lighting and high-intensity lighting for corals and plants.
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Café: catering equipment such as refrigerators, freezers, warmers, dish washer and chip fryers.
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Other: passenger elevator, electronic and audio-visual equipment, computers, photocopiers, life support system monitoring devices, workshop tools, low flow pumps, small aquarium heaters (small winter heating requirement), ozone generators, and other ancillary aquarium tank devices.
Energy use and costs data analysis
Audits and retrofit process and energy reduction target
Indoor temperature changes and thermal comfort survey
HVAC, TES and BMS
Machinery and lighting energy efficiency improvements
Integrated rooftop solar PV system
Results
Financial year | 06/07 | 07/08 | 08/09 | 09/10 | 10/11 | 11/12 | 12/13 | 13/14 | Cost $ 1000s | Comments | Savings from baseline in year 8 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Project year | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||||
Operational | ||||||||||||
1 | Operational changes | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Nil | Shut doors, disabled plant | 319 MWH/year items 1–7 lead to 13% kWh savings total for year 1 |
2 | Indoor air set-point changes | 0 | Nil | From 23 up to 24.5 °C | ||||||||
3 | Improve HVAC maintenance | 0 | Nil | Contractor supervision | ||||||||
4 | Skylights, window tintingb
| 6.5 | 6.5 | Window tinting Feb 2007 | ||||||||
5 | Rectify air leaks | 0 | Nil | Including door curtains | ||||||||
6 | Basic BMS | 0 | Nil | Algorithms to control loads | ||||||||
7 | Walk-in freezer curtain | 0.5 | 0.5 | 910 MWh/year. HVAC-related 66% less HVAC MWh (includes behavioural) | ||||||||
8 | Efficient heat exchangersb
| 100 | 100 | For tank water cooling | ||||||||
9 | High-efficiency HVACb
| 136 | 136 | Total $791,500 | ||||||||
10 | Reflective cool roof paint | 56 | 56 | Metal roof under solar PV | ||||||||
11 | Double glazingb
| 60 | 60 | June 2014 (total $143,300) | ||||||||
Machinery | ||||||||||||
12 | Wave machine efficiencies | 0.3 | 0.3 | Air leaks, plant adjustment | Unknown | |||||||
13 | New dive compressorb
| 17 | 17 | High efficiency 601 kWh/year | 475 MWh/year total 37% less machinery MWh | |||||||
14 | Efficient reverse osmosisb
| 8.4 | 0 | 8.4 | 6-kW saving (total $91,600) | |||||||
15 | New pump models—small | 57 | 103 | Dec 2009 | ||||||||
New pump models—large | 46 | Feb 2009 | ||||||||||
16 | Filtration system changes | 2.0 | 2.0 | 53 labour h at $38/h | ||||||||
Lighting | ||||||||||||
17 | Natural lighting (sola tubes) | 4.3 | 9.3 | 5.5 | 19 | Replacing metal halides | 34 MWh/year 40% less lighting MWh | |||||
18 | Energy-efficient LEDs | 24 | 5.1 | 1.9 | 31 | Most LED installed 2009/2010 | ||||||
19 | Plasma lighting | 3.1 | 3.1 | Aquarium lighting | ||||||||
Power generation | ||||||||||||
20 | Solar PV | 523 | 571 | 33 | 1127 | Installed years 7 and 8 | 300 MWh/year | |||||
Other | ||||||||||||
21 | Energy audits | 37 | 37 | 5 audits from funding outside the Aquarium | ||||||||
22 | Solar hot water systemb
| 5.4 | 5.4 | Dec 2008 | Unknown | |||||||
23 | Audio-visual | No data | New low-power LED TVs | |||||||||
Grid power savings from year 0—% | 13 | 14 | 11a
| 21 | 25 | 27 | 46 | 52 | 50% in 2014/2015 | |||
Total grid electricity used in MWh | 2120 | 2092 | 2179 | 1918 | 1826 | 1774 | 1304 | 1160 | Baseline—2438 MWh, year 0 | |||
Solar PV system generation (MWh) | 152 | 260 | 301 MWh for 2014/2015 | |||||||||
Total capital spending 1000s AU$ | 6.5 | 24 | 23 | 254 | 9.3 | 720 | 573 | 93 | 1712 | $1.7M for all retrofit actions |
Total energy consumption
Total cost versus total savings and distribution of energy use categories
Audits and minimal cost operational changes
Audit reference | Quality acceptable to funding applications | New measures or technical detail suggested (%) | New measures adopted (%) | Report models accurate against actual | Outcomes for new measures adopted | Audit cost (all but D paid for by others) |
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Internal | No | 100 | 100 | n/a | Good | $0 |
A | No | 20 | 10 | Partly | Poor | $10,000 |
B | No | 0 | 0 | n/a | None | $28,000 |
C | No | 0 | 0 | No | None | $42,000 |
D | Yes | 30 | 30 | Mostly | Good | $27,000 |
E | Yes | 100 | 100 | Yes | Good | $10,000 |
F | Yes | 100 | 100 | Yes | Good | $10,000 |
HVAC upgrade and control
Major upgrade of the HVAC system including TES and BMS
Lighting and machinery energy efficiency improvements
Replacement of 46 small aquarium pumps with 33 higher quality pumps | ‘Cheap’ model | Energy-efficient model |
---|---|---|
Capital expenditure over 10-year life | $42,262 | $87,960 |
Total labour cost for breakdown maintenance for 10-year life | $162,602 | $17,293 |
Total life cost of replacement parts/pumps for 10-year life | $33,070 | $4480 |
Total life energy cost over 10-year life | $309,316 | $210,352 |
Total life cycle cost over 10 years | $547,250 | $320,085 |
Total MWh savings over life cycle for the energy efficient pump model | 607 MWh | |
Payback time | 2.2 years |