Hong Kong notched up another record, 2019 was the hottest year since records began in 1884 the Hong Kong Observatory (HKO) revealed .
It should be no surprise really, almost every year HKO reports that temperatures have been steadily increasing year on year, a trend that is not so easy to reverse.
Asia is dominated by the use of electricity for air conditioning, and warmer weather means higher energy bills, and it is not just a local affair either, Australia is also suffering from hotter temperatures and devasting wildfires.
In addition to warmer weather, increasing the air conditioning running hours, the Hong Kong electricity tariffs increased again in 2020, which will add 3-5% to your energy bills.
To offset the increasing costs, building owners can use the subsidies provided by HEC  and CLP to help finance energy efficiency upgrades for the building communal systems, including air conditioning, lifts, lighting, and pumps.
Positive building pressurisation and proper filtering of the outdoor air will be more important as testing reveals plastic in the air we breathe!
Plastic particles have been found in the air in the mountains but now in cities . It may take years for the human studies and research but commonsense dictates plastic inside the human body, particularly in the lung should be minimised now.
Fear not, RTHK reports that some Hong Kong Electric corporate customers will be exempt, but that is bad news for the individual customers who will be paying for that corporate windfall.
In this context, we suspect that corporate customers really means their highest electricity users, and automatically reducing the financial incentive to lower their energy consumption and lower costs.
Part of the problem is related to Hong Kong’s energy policy, it only targets lowering carbon intensity which seems fantastic until you know their plan, to importing more electricity from China generated by nuclear power, this policy is short-sighted, it encourages the status quo, keeping the energy-wasting business as usual culture in place, causing energy waste which has reached epidemic proportions in Hong Kong.
Last year we predicted these increasing tariffs, so looking forward we’ll predict and expect the same type of Christmas gift form HKE and CLP next year.
Moisture is a problem in the tropics so its important to understand two issues, moisture is transported within the air, and through a process known as Diffusion.
One property of air is the water vapour pressure, for air-conditioned buildings, we are mainly concerned with the difference between the outdoor and indoor water vapour pressure. Why air-conditioned buildings? Cooling and dehumidifying indoor air lowers the indoor water vapour pressure.
In the CIBSE guide or equal, properties of air, look up the water vapour pressure for outdoor air say 35 db/28 wb and an air-conditioned space, lets say 24 degC and 50% rh. That delta P, the pressure difference is the driving force for moisture diffusion through the building envelope, including curtain walls, towards the lower pressure space inside buildings.
Typically, we expect that “Good Ventilation” inside the building will transport that moisture and condense it on the cooling coil. However, if the internal face of the external wall is blocked, with a vapour barrier on the inside or obstacles preventing air movement, moisture will accumulate internally causing mould.
Often vinyl wallpaper or a polymer type paint, essentially a layer of plastic, is used inside buildings, which stalls diffusion, causing moisture to accumulate internally, causing damp and mould as shown in the diagram above. If the room is naturally ventilated the water vapour pressure inside and outdoor are effectively equal, and adjacent air-conditioned rooms would with similar conditions means the delta P is also effectively zero.
So its important to understand the different processes, to solve IAQ problems.
HEC and CLP can provide a subsidy to building owners/managers to upgrade the communal services in buildings, including air conditioning, lifts, lighting, water pumps, etc. in commercial and residential buildings.
It’s a fantastic opportunity for capital (CAPex) funding for energy efficiency improvement work! Both schemes are arranged to provide the rebate AFTER the work is completed and approved by the respective utility.
Greening of existing buildings can be a challenge, but the HEC Eco building fund and CLP Smart Power fund can help finance energy efficiency improvement to lower your CAPex and your future energy bills.
For more information call us on +852 2335 9830 today!
Green Building rating systems have to sell the benefits of certification before they can be physically realized because the developer needs to plan, construct, and sell the property.
Then, after the dust has settled, developers can judge if the promised added value was delivered. The WGBC has reported that a Hong Kong developer sold their BEAM Platiumn rated green building for 40% more than neighbouring properties of the same type, and 21% more than other buildings in the same district. A 40% premium, that is impressive. And the developer attributed the reason for the premium was the developments green building features incorporated to gain BEAM Platinum certification.
The message seems very clear, not only does Green Building reduce the environmental impact of the buildings, having a certified Green Building adds value, and its a financially positive decision.