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Fast Money & Foreign Objects
Chilly at Work? A Decades-Old Formula May Be to Blame
By PAM BELLUCKAUG. 3, 2015
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Molly Mahannah wears a sweatshirt and blanket at work in Omaha, wrapping herself up "like a burrito.” CreditChris Machian for The New York Times
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Disgusting
By PAM BELLUCKAUG. 3, 2015
Photo
Molly Mahannah wears a sweatshirt and blanket at work in Omaha, wrapping herself up "like a burrito.” CreditChris Machian for The New York Times
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- wrote on Twitter that at work she felt like an icy White Walker from “Game of Thrones,” said a female co-worker at her digital marketing agency cloaked herself in sweaters, too. But the men? “They’re in, like, shorts.”
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Right. It happens every summer: Offices turn on the air-conditioning, and women freeze into Popsicles.
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RELATED COVERAGEFinally, scientists (two men, for the record) are urging an end to the Great Arctic Office Conspiracy. Their study, published Monday in the journal Nature Climate Change, says that most office buildings set temperatures based on a decades-old formula that uses the metabolic rates of men. The study concludes that buildings should “reduce gender-discriminating bias in thermal comfort” because setting temperatures at slightly warmer levels can help combat global warming.
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Phoebe McPherson, left, at work in Reston, Va. A Snuggie, worn backwards, is one of the many tools she deploys to stay warm at the office in the summer.CreditDrew Angerer for The New York Times
“In a lot of buildings, you see energy consumption is a lot higher because the standard is calibrated for men’s body heat production,” said Boris Kingma, a co-author of the study and a biophysicist at Maastricht University Medical Center in the Netherlands. “If you have a more accurate view of the thermal demand of the people inside, then you can design the building so that you are wasting a lot less energy, and that means the carbon dioxide emission is less.”
The study says most building thermostats follow a “thermal comfort model that was developed in the 1960s,” which considers factors like air temperature, air speed, vapor pressure and clothing insulation, using a version of Fanger’s thermal comfort equation.
PMV = [0.303e-0.036M + 0.028]{(M – W) – 3.96E-8ƒcl[(tcl + 273)4 – (tr + 273)4] – ƒclhc(tcl – ta) – 3.05[5.73 – 0.007(M – W) – pa] – 0.42[(M – W) – 58.15] – 0.0173M(5.87 – pa) – 0.0014M(34 – ta)}
It is converted to a seven-point scale and compared against the Predicted Percentage Dissatisfied, a gauge of how many people are likely to feel uncomfortably cool or warm.
Seems simple enough.
But Dr. Kingma and his colleague, Wouter van Marken Lichtenbelt, write that one variable in the formula, resting metabolic rate (how fast we generate heat), is based on a 40-year-old man weighing about 154 pounds.
Maybe that man once represented most people in offices. But women now constitute half of the work force and usually have slower metabolic rates than men, mostly because they are smaller and have more body fat, which has lower metabolic rates than muscle. Indeed, the study says, the current model “may overestimate resting heat production of women by up to 35 percent.”
“If women have lower need for cooling it actually means you can save energy, because right now we’re just cooling for this male population,” said Joost van Hoof, a building physicist at Fontys University of Applied Sciences in the Netherlands, who was not involved in the study.
“Many men think that women are just nagging,” he said. “But it’s because of their physiology.”
Physiology and clothing. The authors also note that the model is not always calibrated accurately for women wearing skirts or sandals.
“Many men, they wear suits and ties, and women tend to dress sometimes with cleavage,” said Dr. van Hoof, who wrote a commentary about the study. “The cleavage is closer to the core of the body, so the temperature difference between the air temperature and the body temperature there is higher when it’s cold. I wouldn’t overestimate the effect of cleavage, but it’s there.”
So for the planet’s sake, men should “stop complaining,” Dr. Kingma said. “If it is too warm, the behavior thing you can do is take off a piece of clothing, but you can only do that so much. You could also say let’s keep it a very cold building and women should just wear more clothes.”
But his study offers another solution: Change the formula.
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RECENT COMMENTS
TH
10 minutes ago
It's better to have those who are cold wear a sweater than to have others with more active metabolisms sweating and miserable. You can...
T.S.
10 minutes ago
The happiest day of my working life was the day I was promoted and given my own office with its own, individual thermostat. I am happy,...
Alex Kent
10 minutes ago
Right: And I guess it's all that cleavage in the office that's overheating the men!
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Researchers found the women’s average metabolic rate was 20 to 32 percent lower than rates in the standard chart used to set building temperature. So they propose adjusting the model to include actual metabolic rates of women and men, plus factors like body tissue insulation, not just clothing. For example, people who weigh more get warmer faster, and older people have slower metabolic rates, the study reported.
How much warmer an office would become would vary, of course, but the study cites research finding as much as a five-degree difference in women and men’s preferences. Dr. Kingma said a woman might prefer a 75-degree room, while a man might prefer about 70 degrees, which Dr. Kingma said is a common current office temperature.
Some experts doubt the proposed formula would be easily adopted.
Khee Poh Lam, an architecture professor at Carnegie Mellon, said even if the industry accepted a change to the longstanding model, buildings often house different businesses or “squeeze more people in” than they were designed for and partition offices so thermostats and vents are in different rooms. Given these improvisations, he added, “whether this actually affects energy, I think that’s a big leap.”
Still, he said, “we need to keep pushing” for improvements because “the phenomenon of women getting cold is very, very obvious,” and cold or hot employees are less productive.
Individualized temperature controls are the eventual answer, said Dr. Lam, who helped design a “personal environmental module” in the 1990s that was deemed too expensive for commercial development. Now others are developing systems to let workers make their cubicles warmer or cooler.
Kimberly Mark, 31, would appreciate that. This summer, at a software company in Natick, Mass., she and female colleagues are using space heaters. The thermostat is in the office of “the guy next to me,” she said, “and I’m the only woman in the offices that he controls.”
Phoebe McPherson, 21, said she sometimes wears thick leggings, a long-sleeve shirt, a sweatshirt and motorcycle boots to work at a health technology startup in Reston, Va. She often adds a tartan blanket, wraps “a blanket around my legs,” and despite the glaring fashion faux pas, wears a Snuggie backward to seal off any openings.
“I wore a dress once and had to go change,” said Ms. McPherson, who attended college in New Hampshire. While male colleagues wear T-shirts, “I’m bringing all my New Hampshire clothes to work.” And when that and hot coffee fail, she nuzzles against a white fake-fur wall in the office, just to “feel my skin warming up against the fur.”
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- http://www.nytimes.com/2015/08/04/s...ay-be-to-blame.html?smid=fb-nytimes&smtyp=cur
Disgusting
