secret life of Variable Speed Drives by John A. Herbert

Following the success of the secret life of chillers, the secret life of Variable Speed Drives (VSD) might be equally important.
John Herbert hong kong energy efficiency expert

Variable Speed Drives (VSD), also known as Variable Frequency Drives (VFD) can replace motor starters and lower energy costs, but this graph above (real data) shows the motor speed remains pretty constant all day long.  Continue reading

Secret Life of Chillers by John A. Herbert

energy audit expert

Every energy audit is the same but different, the goal, searching for cost and energy savings is the same. whether its factory or office. And we follow the same published process, yet every energy audit guide attempts to detail how to identify those cost savings, and that is where the document evolves from its clinical, prescriptive list of requirements into vague generalizations because examining data, sometimes imperfect data, to find cost savings is more art than science. Continue reading

No excuse to delay energy upgrades on HK Island by John A. Herbert

Funding Energy Upgrades

John Herbert - Green Building Seminar 2011
Cost is always the key issue for energy upgrading projects right? Yet dollar matched funding, upto HKD 200,000 is available for residential projects on Hong Kong Island. For example, for Incorporated Owners (IO) where the total cost of your energy saving project is for example HKD150,000, HKD 75,000 is refunded!

Kelcroft is a Qualified Service Provider (QSP) with practical expert advice to lower your costs, and energy consumption, call the experts today!

For commerical buildings you might be interested to view our Hong Kong Building Energy Consumption Mapping Project (beta) web page.

About the Author

John A. Herbert is a veteran energy expert with more than 30 years construction experience, educated in the United Kingdom he has been working across Asia for two decades for international and local companies. He is a Hong Kong Registered Energy Assessor (REA), and BEAM Professional.

Leaking Ducts by John A. Herbert

leaking air ducts, air conditioning, waste energy

Air Conditioning is expensive and it is the highest portion of your energy, so after buying the central chiller plant, and the cost of energy to provide chilled water to air conditioning units, your precious and expensive conditioned air leaks out, through poor maintenance, wasting energy, and also causing condensation. It is the same as throwing the hundred dollar bills of the roof every day. In energy auditing, as in life, details matter.

Every fire damper in Hong Kong must be inspected annually, in air conditioned ductwork after a few years the access panel (shown in the photo above) is no longer air tight, allowing leakage of expensive cold air, and energy losses. Alone, each energy loss is not significant, across the Hong Kong millions are lost every year.

About the Author

John A. Herbert is a veteran engineer with more than 30 years construction experience, educated in the United Kingdom he has been working across Asia for the last two decades engaged by international and local companies. He is a Hong Kong Registered Energy Assessor (REA), and BEAM Professional.

Condition Survey, Air conditioning Issues…

by John A. Herbert

chiller motor oil leak Hong Kong

There is a saying “An ounce of prevention is worth a pound of cure”, the photo illustrates how to ignore that, we have a 900 Kw 3 phase electric motor, an oil leak, and newspaper stuffed underneath catching dripping oil, that should send alarm bells ringing in every office across the land. Perhaps we need a fire triangle refresher course?

On the topic of condition surveys, I am often asked does the Kelcroft energy audit include condition survey? Yes, is always the answer, it is not an optional extra ASHRAE and other energy auditing standards call for it, an energy audit requires examination of the condition of the plant and equipment as part of the energy assessment to understand its efficiency, in tropical Hong Kong, that will include the central air conditioning plant, including the chillers, the automatic controls, differential bypass valves, variable speed drives, chilled water and condenser water pumps, cooling towers and the like.

In the energy audit report, it will identify any defects, or deferred maintenance issues discovered.

So back the high risk oil leak, literally one stray spark from disaster, the building owner does not know, the building management seem equally oblivious and never reported it, yet we know an ounce of prevention is far far cheaper than the cure.

About the Author

John A. Herbert is a veteran professional with more than 30 years solid construction experience, educated in the United Kingdom he has been working across Asia for the last two decades, serving international, and local companies. And involved with the development of Hong Kong Green Building for more than a decade. He is a Hong Kong Registered Energy Assessor (REA), and a BEAM Professional.

thermal revelations with infra-red by John A. Herbert

thermal scan hong kong, china, asia, Kelcroft

thermal scan hong kong, kelcroft

predicting spalling infra-red condition survey

Infra-red scanning tool is the latest high technology tool for surveying the condition of M&E services and buildings. the condition may appear normal to the naked eye, but infra-red imaging reveals subtle details not normally visible to humans and presents a false colour image for easy review.

#energyaudit #building #survey