Everything you need to know about the wild world of heat pumps
We’re entering the era of the heat pump.
The concept behind heat pumps is simple: powered by electricity, they move heat around to either cool or heat buildings. It’s not a new idea—they were invented in the 1850s and have been used in homes since the 1960s. But all of a sudden, they’ve become the hottest home appliance, shoved into the spotlight by the potential for cost savings and climate benefits, as well as by recent policy incentives.
Simple though the basic idea may be, the details of how heat pumps work are fascinating. In the name of controlling your home’s temperature, this device can almost seem to break the laws of physics. Heat pumps are also getting better: new models are more efficient and better able to handle cold weather.
So let’s dive in and uncover what makes a heat pump tick.
How does a heat pump work?
At a high level, a heat pump gathers heat from one place and puts it in another place. We’ll mostly talk about heat pumps in the context of heating, but they can also be used for cooling, gathering heat from inside and sending it outside like an air conditioner. Many heat pumps can actually be run in reverse, either heating or cooling depending on what’s needed.
The hero in a heat pump is the refrigerant: a fluid that moves in a circuit, soaking up and releasing heat as it goes. Electricity powers the system, pushing the refrigerant around the cycle.
As the refrigerant moves through the heat pump, it’s compressed and expanded, switching between liquid and gas forms to allow it to gather and release heat at different points in the cycle. (If this is enough detail for you, feel free to skip to the next question. Otherwise, join me on a journey inside a heat pump to understand how this all works.)
INTERNATIONAL ENERGY AGENCY
Picture this: it’s a chilly winter day, say 25 °F (-5 °C). You’re sitting on the couch in your living room with a good book, and your cat is curled up nearby. You look over at the thermostat, which is set to 68 °F. Sensible, but a little chilly. You walk over and bump it up a bit, to 70 °F.
Your heat pump has been quietly humming along in the background. Now it kicks things up a notch to raise the temperature: the fan and compressor inside speed up, and the refrigerant starts moving faster to transfer more heat from outside to inside.
It may seem counterintuitive to collect heat from outside when it’s so cold out, so let’s follow the refrigerant for one cycle to see how it works. For most heat pumps, the trip takes just a few minutes.
Heat pump refrigerants have very low boiling points, typically below -15 °F (-25 °C). So at the beginning of our journey, the refrigerant is around that temperature, and in liquid form. Even in the coldest places, a refrigerant in this state is usually significantly colder than the outside air (in our case, more than 40 degrees colder).
In the first stage of its trek, the refrigerant flows through a heat exchanger, past that outside air and warms up enough to start boiling, changing from a liquid to a gas.
The second phase of its journey is a trip through the compressor. The compressor squeezes the refrigerant into a smaller volume, increasing its pressure and boiling point (this will become important in a minute). This also warms it further, so by the time the refrigerant is past the compressor, it’s warmer than the room indoors.
The third leg of the refrigerant’s journey takes it through another heat exchanger. But by now, the refrigerant is a warm gas, above 100 °F, and it’s flowing past a relatively colder room. As it transfers some of that heat into the room with the help of a fan, it starts turning back into a liquid.
Finally, in the fourth stage, the liquid refrigerant will go through an expansion valve, releasing the pressure. Just as squeezing a material heats it up, expanding it allows it to cool down again, so now the liquid is back to a low temperature and ready to absorb more heat to bring inside.
Do heat pumps work in the cold?
The claim that heat pumps don’t work well in really cold weather is often repeated by fossil-fuel companies, which have a
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By: Casey Crownhart
Title: Everything you need to know about the wild world of heat pumps
Sourced From: www.technologyreview.com/2023/02/14/1068582/everything-you-need-to-know-about-heat-pumps/
Published Date: Tue, 14 Feb 2023 19:59:16 +0000
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Tech
The Download: inside the first CRISPR treatment, and smarter robots
This is today’s edition of The Download our weekday newsletter that provides a daily dose of what’s going on in the world of technology.
The lucky break behind the first CRISPR treatment
The world’s first commercial gene-editing treatment is set to start changing the lives of people with sickle-cell disease. It’s called Casgevy, and it was approved last month in the UK. US approval is pending this week.
The treatment, which will be sold in the US by Vertex Pharmaceuticals, employs CRISPR, which can be easily programmed by scientists to cut DNA at precise locations they choose.
But where do you aim CRISPR, and how did the researchers know what DNA to change? That’s the lesser-known story of the sickle-cell breakthrough, which doesn’t rely on fixing the genes responsible for the mutation that leaves patients’ hemoglobin molecules misshapen. Instead, it’s a kind of molecular bank shot—thankfully, one with a happy ending. Read the full story.
—Antonio Regalado
Read more about the sickle-cell breakthrough:
+ I received the new gene-editing drug for sickle cell disease. It changed my life. As a patient enrolled in a clinical trial for Vertex’s new exa-cel treatment, Jimi Olaghere was among the first to experience CRISPR’s transformative effects. Read the full story.
+ The first CRISPR cure might kick-start the next big patent battle. Vertex Pharmaceuticals plans to sell a gene-editing treatment for sickle-cell disease. A patent on CRISPR could stand in the way. Read the full story.
These robots know when to ask for help
The news: A new robot training model, dubbed “KnowNo,” aims to teach robots to ask for our help when orders are unclear. At the same time, it ensures they seek clarification only when necessary, minimizing needless back-and-forth. The result is a smart assistant that tries to make sure it understands what you want without bothering you too much.
Why it matters: While robots can be powerful in many specific scenarios, they are often bad at generalized tasks that require common sense. That’s something large language models could help to fix, because they have a lot of common-sense knowledge baked in. Read the full story.
—June Kim
Medical microrobots that travel inside the body are (still) on their way
The human body is a labyrinth of vessels and tubing, full of barriers that are difficult to break through. That poses a serious hurdle for doctors. Illness is often caused by problems that are hard to visualize and difficult to access. But imagine if we could deploy armies of tiny robots into the body to do the job for us. They could break up hard-to-reach clots, deliver drugs to even the most inaccessible tumors, and even help guide embryos toward implantation.
We’ve been hearing about the use of tiny robots in medicine for years, maybe even decades. And they’re still not here. But experts are adamant that medical microbots are finally coming, and that they could be a game changer for a number of serious diseases. Read the full story.
—Cassandra Willyard
This story is from The Checkup, our weekly biotech newsletter. Sign up to receive it in your inbox every Thursday.
The must-reads
I’ve combed the internet to find you today’s most fun/important/scary/fascinating stories about technology.
1 Use of deepfake pornography apps is soaring
Links to the disturbing AI ‘nudifying’ services are rife on X and Reddit. (Bloomberg $)
The viral AI avatar app Lensa undressed me—without my consent. (MIT Technology Review)
2 TikTok is embarking on an anti-hate speech campaign
Spurred by the criticism the platform received over Israel-Hamas videos (The Information $)
TikTok’s algorithm means everyone’s feed is siloed, though. (The Verge)
The conflict has forced Meta’s oversight board to investigate two posts. (Wired $)
Republicans are repeating bogus claims to try and get TikTok banned. (Motherboard)
3 A major Abu Dhabi-based AI company is cutting ties with China
G42 is ditching its Chinese hardware contracts in favor of US suppliers. (FT $)
4 We’re learning more about how vaping affects us
It’s better than smoking. But that doesn’t mean it’s good for you, either. (New Scientist $)
Social media is full of posts promoting vaping to young users. (The Guardian)
5 The US wants to build the next revolutionary particle collider
But it could take years to get the project off the ground. (NYT $)
6 The Milky Way is likely to devour the galaxies surrounding it
It’s looking like dark matter could have something to do with it. (Ars Technica)
7 Our microbiomes aren’t diverse enough
And our sedentary lifetimes and antibiotics are to blame. (Proto.Life)
We’re learning a lot more about the vaginal microbiome. (Scientific American $)
How gene-edited microbiomes could
————
By: Rhiannon Williams
Title: The Download: inside the first CRISPR treatment, and smarter robots
Sourced From: www.technologyreview.com/2023/12/08/1084760/the-download-inside-the-first-crispr-treatment-and-smarter-robots/
Published Date: Fri, 08 Dec 2023 13:10:00 +0000
Tech
The lucky break behind the first CRISPR treatment
The world’s first commercial gene-editing treatment is set to start changing the lives of people with sickle-cell disease. It’s called Casgevy, and it was approved last month in the UK. US approval is pending this week.
The treatment, which will be sold in the US by Vertex Pharmaceuticals, employs CRISPR, the Nobel-winning molecular scissors that have had journalists scrambling for metaphors: “Swiss Army knife,” “molecular scalpel,” or DNA copy-and-paste. Indeed, CRISPR is revolutionary because scientists can so easily program it to cut DNA at precise locations they choose.
But where do you aim CRISPR? That’s the lesser-known story of the sickle-cell breakthrough. The disease is caused by faulty hemoglobin, the molecule that carries oxygen in the blood. To cure it, though, Vertex and its partner company, CRISPR Therapeutics, aren’t fixing the genes responsible for the mutation that leaves those molecules misshapen. Instead, the new treatment involves a kind of molecular bank shot—an edit that turns on fetal hemoglobin, a second form of the molecule which we have in the womb but lose as adults.
You can think of how the edit works as a kind of double negative. It adds a misspelling to the turbo-booster of another gene, BCL11A, that is itself what inhibits the production of fetal hemoglobin in adult bodies. Without that booster, there’s less inhibition, and more fetal hemoglobin. Got it?
“When you inhibit the enhancer, you inhibit the inhibitor,” says Daniel Bauer, a professor at Boston Children’s Hospital and Harvard University, who helped work it out. “It is kind of complicated.”
The important thing is a happy ending—and this edit really works. Some patients say they lived in fear of dying, either from an acute attack of sickling (when their red blood cells start blocking vessels) or from slow, insidious organ damage. Now early volunteers say they’re grateful—and, after living with disease their whole lives, even a little shocked—to be cured.
Newborn theory
The idea that fetal hemoglobin can protect against the disease is an old one. Sickle-cell is most common in people with African ancestry. A doctor on Long Island, Janet Watson, had noticed in 1948 that newborns never showed its signs—the main one being misshapen, crescent-shaped red blood cells. That was pretty odd for an inborn condition.
“Sickle-cell disease should occur in infancy as often as later in life,” Watson wrote. But since it didn’t, Watson hypothesized that the fetal form of the molecule, active in the womb, was protecting babies for a few months after birth, until it was replaced by the adult version: “The theory that at once presents itself is that fetal hemoglobin is unable to produce sickling.”
She was right. But it took another six decades to learn how the switch-over worked—and how to flip it back. Many of those discoveries were made in the laboratory of Stuart Orkin, a Harvard researcher who published his first paper in 1967 and who’s lived through several eras of research on blood diseases, starting near the dawn of molecular biology.
“I am one of the last men standing,” Orkin told me with a grin when I met him for a corned-beef sandwich.
Stuart Orkin analyzing DNA from individuals with blood disorders in his lab in 1985.BOSTON CHILDREN’S HOSPITAL
He’s a clever scientist who a long time ago decided to study how the blood system is regulated. Logistically, it was a great topic; blood cells are easy to get hold of and study.
“I like to solve a problem, and here is a problem that could be solved,” Orkin says. “How does the system work, and then can you do anything about it?”
Special sauce
Bill Lundberg, the former chief scientific officer of CRISPR Therapeutics, the biotech that first started developing the treatment eight years ago (Vertex later joined as a partner), says the company’s sickle-cell project directly made use of Orkin’s findings. “Stu’s role is really underappreciated,
————
By: Antonio Regalado
Title: The lucky break behind the first CRISPR treatment
Sourced From: www.technologyreview.com/2023/12/07/1084629/lucky-break-crispr-vertex/
Published Date: Thu, 07 Dec 2023 14:00:09 +0000
Did you miss our previous article…
https://mansbrand.com/the-download-googles-gemini-is-here-and-sundar-pichai-talks-ai/
Tech
The Download: Google’s Gemini is here, and Sundar Pichai talks AI
This is today’s edition of The Download our weekday newsletter that provides a daily dose of what’s going on in the world of technology.
Google DeepMind’s new Gemini model looks amazing—but could signal peak AI hype
Hype about Gemini, Google DeepMind’s long-rumored response to OpenAI’s GPT-4, has been building for months. Now, the company has finally revealed what it has been working on in secret all this time. Was the hype justified? Yes—and no.
Gemini is Google’s biggest AI launch yet—its push to take on competitors OpenAI and Microsoft in the race for AI supremacy. There is no doubt that the model is pitched as best-in-class across a wide range of capabilities—an “everything machine.”
But while it’s a big step for Google, but not necessarily a giant leap for the field as a whole. Judging from its demos, it does many things very well—but few things that we haven’t seen before. Read the full story.
—Melissa Heikkiläa & Will Douglas Heaven
Google CEO Sundar Pichai on Gemini and the coming age of AI
This last year has largely been defined by the AI releases from one company: OpenAI. The rollout of DALL-E and GPT-3.5 last year, followed by GPT-4 this year, dominated the sector and kicked off an arms race between startups and tech giants alike
Now, with the release of Gemini, Google has thrown its hat into the ring. The new AI model reflects years of efforts from inside Google, overseen and driven by its CEO, Sundar Pichai.
Our editor-in-chief Mat Honan sat down with Pichai at Google’s offices in Mountain View, California, on the eve of Gemini’s launch to discuss what it will mean for the company, its products, AI, and society writ large. Read the full interview.
How carbon removal technology is like a time machine
By burning fossil fuels, we’ve released greenhouse gases by the gigaton. There’s a lot we can (and need to) do to slow and eventually stop these planet-warming emissions. But carbon removal technology has a different promise: turning the clock back.
Well, sort of. Carbon removal can’t literally take us back in time. But this time-machine analogy for thinking about carbon removal—specifically when it comes to the scale that will be needed to make a significant dent in our emissions—is a favorite of climate scientist David Ho.
Casey Crownhart, our climate reporter, has taken a look at what it might take for carbon removal to take us back far enough in time to reverse our mistakes—well, the emissions-related ones, anyway. Read the full story.
This story is from The Spark, our weekly climate and energy newsletter. Sign up to receive it in your inbox every Wednesday.
The must-reads
I’ve combed the internet to find you today’s most fun/important/scary/fascinating stories about technology.
1 The EU is racing to regulate AI
Meanwhile, it seems like the US Congress is forging a very different regulatory path. (WP $)
EU lawmakers are believed to have made a provisional deal. (Reuters)
AI advances far more rapidly than policy. (NYT $)
2 Celebrities have been tricked into recording Russian propaganda
Trolls paid famous faces to record supportive clips for ‘Vladimir’ over the Cameo app. (WSJ $)
The clips rapidly spread across Russian networks and news organizations. (NYT $)
3 Startups are imploding all over the place
Once-promising multi-million dollar ventures are failing—and it’s only getting worse. (NYT $)
4 This man blew the whistle on Amazon’s abuse of teenager labor
But four years on, nothing has changed. (FT $)
5 A load of EVs are due to lose their tax credits
Cars with battery materials sourced from China will lose out on the $7,500 credit. (The Verge)
Ford doesn’t think its Mustang electric cars will qualify. (Reuters)+ EV tax credits could stall out on lack of US battery supply. (MIT Technology Review)
6 Building a gaming empire is seriously hard work
Just ask the TV streaming giants who are trying, and failing. (The Information $)
7 Forget microplastics—it’s time to worry about nanoplastics
Because they’re even smaller, they’re potentially even worse for our health. (Motherboard)
Microplastics are everywhere. What does that mean for our immune systems? (MIT Technology Review)
8 It’s time to revive the humble dry stone wall
Concrete isn’t great for the environment. Can stone walls take over? (The Atlantic $)
Inside a high-tech cement laboratory. (MIT Technology Review)
9 An AI drive-thru needed humans to handle 70% of its orders
It raises questions over how capable AI really is at these kinds of tasks. (Bloomberg $)
Even McDonald’s wants a slice of the generative AI pie. (The Verge)
10 Space telescopes are getting even bigger
Move over JWST—the Extremely Large Telescope is here. (Economist $)
Quote of the day
“Even if Musk were
————
By: Rhiannon Williams
Title: The Download: Google’s Gemini is here, and Sundar Pichai talks AI
Sourced From: www.technologyreview.com/2023/12/07/1084648/the-download-googles-gemini-is-here-and-sundar-pichai-talks-ai/
Published Date: Thu, 07 Dec 2023 13:10:00 +0000
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