Air Conditioning

<html><body>
EXPERT OBSERVERS
 
It might be blisteringly hot outside, but if you work in an office building, the chances are it’s always reassuringly cool (or cold, depending on your preference) once you walk inside.
In Australia and much of the rest of the world, it’s become standard practice for offices to be cooled or heated to a uniform 22℃. In many Australian offices, this temperature is even officially enshrined in <a href="https://www.propertyobserver.com.au/https://www.emeraldinsight.com/doi/full/10.1108/17561451211211714" target="_blank">commercial tenancy agreements</a>.
And yet temperature is routinely one of the sore points of office politics – many office workers constantly feel too hot or cold at work. Of course, that might simply be because the air conditioning doesn’t work very well where you work. But it’s also reasonable to ask whether 22℃ is really such a magic number after all.
Our review of the available research, <a href="https://www.sciencedirect.com/science/article/pii/S0306261918318233" target="_blank">published recently in the journal Applied Energy</a>, suggests not.
The air conditioning industries certainly view 22℃ as the magic number, judging by guidelines published by the <a href="https://www.rehva.eu/fileadmin/Promotional_material/PPTs/Nr_6_Indoor_Climate_and_Productivity_in_Offices.pdf" target="_blank">European</a> and <a href="https://www.ashrae.org/technical-resources/ashrae-handbook/description-2017-ashrae-handbook-fundamentals" target="_blank">US</a> industry peak bodies. Both claim that office workers’ cognitive performance at different temperatures follows an “inverted U” shaped curve, which <a href="https://indoor.lbl.gov/publications/room-temperature-and-productivity" target="_blank">peaks at 22℃</a>.
<img src="https://images.theconversation.com/files/261648/original/file-20190301-110150-ggyjuv.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="">Inverted-U function between temperature and cognitive performance. CREDIT
This explains why 22℃ has prevailed as the chosen figure all over the world, regardless of <a href="https://www.sciencedirect.com/science/article/pii/S0378778815302632" target="_blank">how much it might cost</a> to heat or cool work spaces to that temperature in different climates. In the heat of an Australian summer this typically involves lots of cooling, but the view is that the prodigious output of comfortably cool workers more than justifies the electricity bill.
But are things really as simple as the graph above would have us believe? To answer that question, we critically reviewed almost 300 studies from a wide range of disciplines including physiology, psychology, ergonomics, neuroscience, sports science, human-technology interaction, and more.
We concluded that the relationship between temperature and performance is not an “inverted U” but rather an “<a href="https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1023&amp;context=jhpee" target="_blank">extended U</a>”. The evidence in fact suggests that human performance remains relatively stable across a broad range of acceptable temperatures, but then rapidly deteriorates once it gets any hotter or colder than this. The boundaries of the acceptable ranges depend on a lot of factors, such as the type of task you are doing, how demanding the task is, how adverse the temperature is, how skilled and motivated you are in doing your task, to name just a few. Our previous research found that workers <a href="https://theconversation.com/chill-out-a-slightly-warmer-office-wont-make-it-too-hot-to-think-93789" target="_blank">perform just the same at 25℃</a>, for instance.
<a href="https://images.theconversation.com/files/261600/original/file-20190301-22837-ii9h2v.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/261600/original/file-20190301-22837-ii9h2v.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt=""></a> Extended-U relationship between temperature and cognitive performance. CREDIT, Author provided
This is because humans are not just simple, passive machines. We can adapt in all sorts of ways to moderate levels of thermal stress. Common ways of <a href="https://www.sciencedirect.com/science/article/pii/S0378778897000534" target="_blank">adaptation</a> include behavioural adjustment, physiological acclimatisation, psychological habituation, and probably most important of all, expectation adjustment.
So it turns out that our brains can still be at their sharpest even if it’s not exactly 22℃. But that’s not the only reason why the magic temperature is a myth. The existing rationale conflates “cognitive performance” with “office productivity”, when in reality these are two very different things.
“Performance” is a person’s ability to produce “goal-directed activity”. In performance science, a job or task is often broken down into different performance components, such as memory, concentration, logical thinking, executive function and so on. “<a href="http://soh.iums.ac.ir/uploads/0415237920_95689.pdf" target="_blank">Productivity</a>” is the extent to which an organisation is progressing towards its systemic goals, whether that be the amount of products they sell in a year, or the number of customers served within a specific period of time and how satisfied those customers are with the quality of service they received.
But there is no standard way to <a href="https://www.propertyobserver.com.au/https://www.emeraldinsight.com/doi/abs/10.1108/14630010710845730" target="_blank">quantify office productivity</a>. The common practice is to use performance measures as a proxy for overall productivity, but this is problematic for several reasons.
The first is that simulated performance tasks do not accurately represent the nature of real work carried out in actual workplaces. Standard cognitive tasks testing your memory, concentration and vigilance performance might not faithfully capture your ability to generate useful contribution towards achieving your company’s goals.
Second, productivity can also depend on many factors besides workers’ ability to perform. These might include workplace culture, organisational structure, job security and satisfaction, workload, management style, and personal factors such as injury, loss of sleep, life events, health and well-being, or financial stress. Distracted, disgruntled or worried workers aren’t going to be very productive, regardless of what the office temperature will be.
There are practical implications to this. Office managers might be wasting money chasing the “best” temperature for maximum productivity while ignoring other factors that have a much larger bearing on it.
An air-conditioning setpoint which is closer to the outdoor weather, aided by <a href="https://www.sciencedirect.com/science/article/pii/S0360132309000547" target="_blank">Personal Comfort Systems</a> (like a desk fan, or contact cooling/heating device) may <a href="https://www.sciencedirect.com/science/article/pii/S0306261915016888" target="_blank">save energy bills</a> while maintaining high levels of workplace satisfaction and mental performance.<img src="https://counter.theconversation.com/content/111823/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important; text-shadow: none !important;">
<a href="https://theconversation.com/profiles/fan-zhang-455627" target="_blank">Fan Zhang</a>, Lecturer in Architectural Science, <a href="http://theconversation.com/institutions/griffith-university-828" target="_blank">Griffith University</a>; <a href="https://theconversation.com/profiles/peter-hancock-428234" target="_blank">Peter Hancock</a>, Professor of Psychology, Civil and Environmental Engineering, and Industrial Engineering and Management Systems, <a href="http://theconversation.com/institutions/university-of-central-florida-1925" target="_blank">University of Central Florida</a>, and <a href="https://theconversation.com/profiles/richard-de-dear-12933" target="_blank">Richard de Dear</a>, Director, Indoor Environmental Quality Laboratory, <a href="http://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>
This article is republished from <a href="http://theconversation.com" target="_blank">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/why-the-perfect-office-temperature-is-a-myth-111823" target="_blank">original article</a>.
</body></html>

jrobinson-rf4aSBido9

Why the 'perfect' office temperature is a myth

<html><body>
Air-conditioning giant Daikin has secured two new industrial trade centres, in Brisbane and the Gold Coast, just before the onset of the summer season.
Daikin had tasked Savills to assist with finding suitable facilities.
The deals were negotiated by Savills’ Shaw Harrison and Callum Stenson.
Both of the new Daikin stores open this month, with the Brisbane store located at 1/210 Robinson Road in Geebung totalling 710 sqm, and the Gold Coast store located at 26 Lawrence Drive in Nerang totalling 809 sqm. 
It will pay a combined rental of $263,750 per annum.
Daikin has committed to a three-year lease on both properties.
“While Daikin were particularly specific with their requirements we identified well over 20 suitable locations after conducting an extensive market search,” Harrison said.
The Geebung property was vacant prior to Daikin signing the lease, and the property owner assisted with renovating the building to suit Daikin’s showroom fit-out requirements. 
“The main road frontage along Robinson Road was exactly what they were seeking for their Brisbane display centre, with other trade-based industry users also located along this busy strip,” Harrison said.
The newly constructed Nerang facility in the Gold Coast was being marketed by GC Commercial after the previous tenant was involved in a major fire which required the building to be completely rebuilt. 
 
</body></html>

jonathanchancellor-7SQnKwU6yx

Daikin sets up new offices in Brisbane and Gold Coast ahead of summer

<html><body>
<img src="https://counter.theconversation.edu.au/content/69410/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1">
GUEST OBSERVER
As the weather heats up, Australian households won’t just be cranking up the air conditioning for themselves. Some households will be turning it on for their dogs or cats. 
Our research on energy demand and household cooling highlights a recent trend towards air-conditioning rooms or homes for pets. As well as cooling homes occupied by both humans and their furry friends, air conditioners may be left on when dogs or cats are home alone. 
Some pet owners also leave doors and windows open for their dogs and cats to move between indoor and outdoor areas. This means that air conditioners have to work harder and use more energy to maintain indoor temperatures.
Our research is consistent with an emerging international trend towards the “humanisation of pets”, which is contributing to energy use in households. 
A 2013 study released by E.ON UK (a UK power company) on “hot-dogs and thermo-cats” found that more than half (52%) of UK pet owners turn up the heating for their pets when they go out. Some UK households also leave radios or televisions on for pets so that they don’t get lonely when their owners leave the home.
In other areas of everyday life, cats and dogs now play iPad games, eat specialised diets, have heated mats or air-conditioned kennels, and have their own fashion accessories and electronic toys.
The energy impacts of home cooling
On average across Australia, heating and cooling make up 40 percent of our energy use in households, not including hot water. 
Most Australians who live in southern states use cooling in their homes sporadically, turning it on during hot summer afternoons and evenings when they get home from work or other activities. The rapid growth in residential air conditioning for this purpose has been one of the main contributors to Australia’s peak electricity demand, which has increased energy bills.
Trends in pet cooling could change the energy demand for cooling in homes. Australia has one of the highest rates of pet ownership in the world, with 63% of households keeping an animal as a pet. 
According to a 2013 report by the Animal Health Alliance, there are 4.2 million pet dogs and 3.3 million pet cats in Australia. Of these, 76% of dogs and 92% of cats are kept exclusively or partly indoors. 
Providing air conditioning for pets during the day when people aren’t at home would raise residential energy demand. It could also extend and possibly increase electricity peaks if more areas of the property (such as kennels or garages) are being cooled for a longer time.
What makes pets hot?
Although cats and dogs differ in their physiology, in general older, sick or overweight pets may be less resilient to the heat. Some breeds may also be more vulnerable than others. 
For example, short-snout dog breeds (Bulldogs, Pekes and Pugs) are more likely to suffer from heatstroke. This also applies to short-faced cats like Persians or exotics. 
Many things can exacerbate heat stress for pets. For example, people living in apartments may find it more difficult to provide cool outdoor spaces for dogs, or to engage in “waterplay”, as recommended by Pets Australia.
How to keep pets cool
Advice on how to keep pets cool varies and is different for cats and dogs. Pets Australia recommends providing cool spaces such as shade, cold tiles or digging holes in the soil. Other examples include giving dogs cool treats like frozen meat, providing lots of water for hydration and stopping exercise. 
Some websites recommend keeping pets inside on hot days, preferably with an air conditioner or fan turned on. Other sites recommend cooling mats or vests such as gel pads, which can be refrigerated or frozen prior to use. 
Murdoch University provides advice on how to recognise heatstroke warning signs, and what to do if you suspect your pet is suffering from heatstroke. The growing market for pet cameras is one way to keep an eye on pets while owners are out of the house. 
What needs to be done?
As climate change continues to increase the severity and duration of heat waves, the incidence of heatstroke in pets is likely to increase too. This applies especially to those living in energy-inefficient housing or with access to poor-quality outdoor environments. 
There is a clear need to seriously consider pet cooling in the design of energy-efficient housing and in energy policy that targets households.
It may also be timely to reconsider pet types and breeds appropriate for the Australian climate. Siberian huskies, for example, prefer cooler climates and may be more likely to suffer from heatstroke than breeds with smooth or short coats.
More research is also needed to understand how Australian households are changing the ways they keep their pets cool, and what can be done to reduce heat stress in pets without increasing energy demand or electricity peaks in homes.
In the meantime there is a range of advice on how to keep pets cool. Many creative solutions are available that don’t require leaving the air conditioner running.
Yolande Strengers is senior research fellow, Centre for Urban Research, RMIT University and can be contacted <a href="https://theconversation.com/profiles/yolande-strengers-15350" target="_blank">here</a>.
Cecily Maller is vice chancellor's senior research fellow, Centre for Urban Research, RMIT University and can be contacted <a href="https://theconversation.com/profiles/cecily-maller-15732" target="_blank">here</a>. Larissa Nicholls is research fellow, RMIT University, and can be contacted <a href="https://theconversation.com/profiles/larissa-nicholls-109087" target="_blank">here</a>.
All are authors for The Conversation.
</body></html>

jchancellor-FAypfDUnLy

Hot dogs and cool cats: keeping pets cool without blowing your energy bill

<html><body>
GUEST OBSERVER
Governments and private companies could save millions of dollars and drastically reduce their carbon footprint with a simple adjustment to the way they use air conditioning.
Air conditioning systems were generally fixed at what is considered to be an optimal 22 degrees based on an arbitrary standard which took no account of outside temperatures and employee comfort levels. It turns out that we heat and cool the built environment to a fixed 22 degrees. Why? Because it is the thermal comfort level of a forty four year old man which was determined by the Americans in the 1950s. I kid you not. This is an arbitrary point that makes little sense and which costs governments and industry millions of dollars a year to say nothing of the impact on the environment. In 2008 the United Nations, as a publicity stunt at its New York headquarters, adopted a temperature range of 19-25 degrees. A month later the UN estimated the savings at one hundred thousand US dollars. In Australia some 40 percent of our energy is consumed in the built environment and a large amount of that energy is used in heating and cooling. The question is why wouldn’t you adopt some flexibility with regard to your air-con temperature settings? If we did this in Australia in office buildings and shopping centres, it would save a hundred million dollars and three hundred thousand tonnes of carbon emissions per year and it would not cost a cent. Now let’s run that out through all the other property in the country including residential and then run that out around the world and we are talking billions of dollars and millions of tonnes every year. Irrespective of the dollar savings, it was incumbent upon governments and industry to make that adjustment as part of their social responsibility.
For more information, <a href="https://www.savills.com.au/research/australian-research/life-out-of-balance.aspx" target="_blank">click here</a>.
Tony Crabb is national head of research, Savills Australia and can be contacted <a href="https://www.savills.com.au" target="_blank">here</a>.
</body></html>

Air conditioning at 19 to 25 degrees would save millions of dollars: Tony Crabb

<html><body>
Governments and private companies could save millions of dollars and drastically reduce their carbon footprint with a simple adjustment to the way they use air-conditioning, according to new research by Savills. 
In a presentation posted to the online knowledge clearinghouse TED (Technology, Entertainment and Design), Savills Australia’s national head of Research, Tony Crabb, said air conditioning systems were generally fixed at what is considered to be an optimal 22 degrees based on an arbitrary standard which took no account of outside temperatures and employee comfort levels.
"It turns out that we heat and cool the built environment to a fixed 22 degrees. Why? Because it is the thermal comfort level of a 44-year-old-man which was determined by the Americans in the 1950s. I kid you not," he said.
"This is an arbitrary point that makes little sense and which costs governments and industry millions of dollars a year to say nothing of the impact on the environment.’’
By way of an example, Crabb said that in 2008 the United Nations, as a publicity stunt at its New York headquarters, adopted a temperature range of 19-25 degrees. A month later the UN estimated the savings at US$100,000.
"In Australia, some 40 per cent of our energy is consumed in the built environment and a large amount of that energy is used in heating and cooling. The question is why wouldn’t you adopt some flexibility with regard to your air-con temperature settings?
"If we did this in Australia in office buildings and shopping centres it would save a hundred million dollars and three hundred thousand tonnes of carbon emissions a year and it would not cost a cent. 
"Now let’s run that out through all the other property in the country including residential and then run that out around the world and we are talking billions of dollars and millions of tonnes every year,’’ Crabb said. 
Irrespective of the dollar savings, he said governments and industry should make the effort to adjust the air-conditioning as part of their social responsibility.
</body></html>

Air Conditioning

Editor's Picks

Have something to contribute?

Developments

New apartments

New townhouses

News

Air Conditioning

Editor's Picks

Receive the latest news stories to your inbox

Have something to contribute?

Developments

New apartments

New townhouses

News