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Heat Pumps: the Future of Home Heating technology connections heat pump

by haisanPHANTHIET

It’s so cold that it’s hot.
Part 2:
I referenced a lot of old videos in this one. Here they are, in clickity linkity form!
Chest Freezers; What they tell us about designing for X

Old-fashioned rice cookers are extremely clever

Reusable handwarmers that get hot by freezing

I also made passing references to
Forced-air Furnaces: The What, Why, and How

Portable Air Conditioners – Why you shouldn’t like them

Technology Connextras (the second channel that stuff goes on sometimes):

Technology Connections on Twitter:

The TC Subreddit

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Technology Connections 14/12/2021 - 6:48 Chiều

Hello! Here's a comment with some extra info on efficiency and the metering devices used in heat pumps.
First: my wording on the efficiency drop in the cold was sloppy, and it sounds like I'm suggesting the need for defrosting is the only reason it loses efficiency. It is a reason, but not the biggest one – that's simply that as the outdoor temperature gets colder, it's harder for the refrigerant to absorb heat because the temperature difference between it and the air gets smaller. In fact, in the clip when it was -10°, it wasn't building much frost at all because it was very dry. But that was so cold that the refrigerant could barely capture any energy, which is why its output was tepid. And to be clear, its rating down to 5° doesn't mean it operates at full efficiency at that temperature. That's just the lowest temperature that it can sustain its rated heating output.
Re: metering devices. I still somewhat suspect that the mini-split has a capillary tube and largely because of its cost. It was surprisingly inexpensive (this unit was about $1000, but the smallest units from this same manufacture only cost $750 and are fully capable heat pumps). If you use a thermal expansion valve or similar, you need one for each direction which adds to the system's complexity somewhat. I'd still argue that it hardly does – it is, after all, one or two small components of a large system. But simply reversing the refrigerant flow doesn't work on its own in systems that use these more complex metering devices. They'd need some additional piping and valve work (some such valves were visible in the demo rig) to accommodate two metering devices for each direction of flow.

Jim Hill-BKK 14/12/2021 - 6:48 Chiều

Air heat pumps have the advantage of continuously circulating air around them, replenishing the heat extracted, not so for ground systems

Ryan Conifer 14/12/2021 - 6:48 Chiều

Was the gentleman on your shirt from the old Epcot Norway ride???

David Gallegos 14/12/2021 - 6:48 Chiều

Guys I work on these things , they ARE GARBAGE

Look after your own bills 14/12/2021 - 6:48 Chiều

Haha just fell of my chair laughing Electricity is 4 times the price of gas in UK Heat Pump don’t get hot enough in winter talking heat ASHP talking Kelvins not Centigrade or Fahrenheit do your sums on that one,why the big propeller to blow cold air on something to produce heat.he drives a BMW they did the same sums.Heat Pumps go straight in the bin rubbish they are,bull shut baffles brains

The Wide Open Life 14/12/2021 - 6:48 Chiều

In an ideal world everyone would use heat pumps and use gas only tor water heating (in places where a heat pump water heater isn’t practical) but still keeping an old school 3 burner propane heater in the garage for when the power goes out, or if load shedding ever became a problem

The country Where I live there is no piped natural gas and all the electricity is hydro generated, most people that don’t use a fireplace will use a heat pump or a combination of both, very very rarely do you see propane space heating, although a lot of people use tankless gas water heaters

Ideally people would use electric everything due to our hydro generation, but the high price of power dictates that

The Wide Open Life 14/12/2021 - 6:48 Chiều

Jeez North America is about 15-20 years behind Australia and New Zealand 😂

Blaze Townsend 14/12/2021 - 6:48 Chiều

Heat pumps are amazing. Mine has a COP of 3.8 which is higher than what you listed. (It lists being made by Blueridge, but it is just a rebranded GREE unit but I think that was fine as it was 400 less than the GREE Sapphire.) I installed our minisplit heat pump because our similarly sized window ac unit was using too much power. I am sounding like a advertisement here, but it is saving us over 400 a year so far with the addition of a inverter style window AC for our upstairs. Not enough time with it used as a heater, to offset our 95% efficient boiler so we only heat the downstairs during awake times, to see if it saves us money overall per month.

John Anderson 14/12/2021 - 6:48 Chiều

Oh yes, that was when that spineless wimp, Ted Cruz fled to Cancun… leaving Texans to freeze to death in the dark.

Samuel Tetley Estes 14/12/2021 - 6:48 Chiều


Emilio Desalvo 14/12/2021 - 6:48 Chiều

You should also add a line in the credits naming the t-shirt you are wearing…

LegendaryDaph 14/12/2021 - 6:48 Chiều


Stanislav BANDUR 14/12/2021 - 6:48 Chiều

it is not so new, I use it since end of 2008 and it was already on market few years then. (air to air, if I could I will change that to soil to air/"faucet" water )

HiDiHoVideos 14/12/2021 - 6:48 Chiều

OK…but how can we use this to cool down the planet?

G Lloyd 14/12/2021 - 6:48 Chiều

Your Superman hair sold me on your channel faster than a speeding electron

Damian Bloodstone 14/12/2021 - 6:48 Chiều

I can't say for all, but when it gets below 34F degrees, the heat pump part no longer works to pump heat into your home. Instead a 1500 watt heating coil in the inside part of the unit turns on as auxillary heat running until it gets the temp you set in your home. I have also seen the best of them freeze up entirely outside and break the radiator/heat exchanger tubes. This all depends on what the temperature is outside. They are great for summer, but can be deadly in winter if it gets below 32F/0C degrees. This is only what I have found with mine.

Marcus Grande 14/12/2021 - 6:48 Chiều

Often glossed over in heat pump vs gas furnace discussion is the reason I will always prefer a gas furnace over a heat pump — power outages. This past Feb in Texas when power was out for days and for some even weeks, anyone with a gas furnace and a transfer switch or some way to connect a modest generator or battery backup to the furnace was able to keep the house warm. A 1/4 HP furnace will only consume about 400W to run the fans. On the larger side, a 1/2 HP furnace consumes about 800W. There is no way a whole home heat pump can even come close to that. It's more like an AC unit which takes thousands, not hundreds, of watts to run, and has an even higher starting power requirement.

We will never be rid of power outages. Whether it's a snow/ice storm, wind storm, fire, tornado, hurricane, or a cyber attack on power infrastructure, you need a way to keep the critical devices charged, a way to cook, and to keep the heat on in the winter to keep the pipes from freezing and some air moving in the summer. When we lose power I can hook up my battery backups to my EZ Generator transfer switch for my furnace and run for days. I can even run off an inverter on my car. No way you can do that with heat pump.

Now I acknowledge that it's possible to lose natural gas in a crisis. That did happen to some in some apartments in Texas where they were without gas for weeks. But playing the statistics, in 30 years I have never lost gas. In that same time frame I can't count the number of times I've lost power. Lost power just about a month ago due to high winds over a 2 day period.

Even if you have a generator or battery large enough to run a heat pump, it will eat through your fuel/charge orders of magnitude faster than a gas furnace. Sorry, until that problem is solved (which I don't know if it can be), I'm sticking to gas.

dynomar 14/12/2021 - 6:48 Chiều

Isn't this basically reverse AC?

Crayfish Craig 14/12/2021 - 6:48 Chiều

As an hvac tech it annoys me that the heat pump used by that supporter isn’t level

Mike Breaton 14/12/2021 - 6:48 Chiều

Hello from Ontario Canada. I have a 3 ton heat pump and it is all I need to heat 3000 sq feet for all but January and February most years. These things are black magic.

GravityRoller 14/12/2021 - 6:48 Chiều

At 30:00 with a heat pump being so far out of level, does this condition negatively effect efficiency ?

Car Guy VA 14/12/2021 - 6:48 Chiều

The heat strips consume 3 times the energy of the compressor. I live in a place where the average winter temperature is 50°. This winter my heat strips blew a fuse and the compressor could not get the temperature inside the house above 68°. So even in this mild climate the heat strips are absolutely essentials to stay comfortable. And those heat strips cost a lot of money to operate! So I bought a smart thermostat and it actually stages use of the heat strips to minimize power consumption. But I still prefer my old heating system in my old house which was natural gas heat and electric air conditioning. My house was always comfortable and it was cheap to do so.

lawnboy81SMS 14/12/2021 - 6:48 Chiều

Drinking game: Take a drink every time he says “heat pump” lol

Jacques Chouette 14/12/2021 - 6:48 Chiều

I've lived in many places where the winter temperature didn't usually get below 5 C and the air conditioner doubled as a heat pump. Although you could use the heat pump to heat your home (or the room), it didn't do it all that well and you usually had to have a space heater in the room you were in if you really wanted the room warm. In colder climates where the winter temperature was much colder, you always had some better way to heat the house because a heat pump just wouldn't cut it.

g pilsitz 14/12/2021 - 6:48 Chiều

Since I had a new heat pump installed 7 years ago the thing never worked right. The installer gave up and after 3 years and the warranty was up, it cost over $300 USD each time they would come out (each fall). Something to do with something g card an X valve. Two of these later it sti does the same thing: when changing from cooling to heat, it trips the over pressure limiter. So we have to use it on Emergency heat when it gets cold, that get expensive quickly. U had older model heat pumps in different homes before and they worked perfectly. They could keep us toasty warm down to about 22°f outside temp. This newer 400 something coolent is not anywhere near as good as the older 134A .

wilbur 14/12/2021 - 6:48 Chiều

Sounds like you need some rubber isolators on your heat pump/AC

Andy Van Pelt 14/12/2021 - 6:48 Chiều

Your videos are so good. They're accurate, interesting, well-written, and well-edited. You're the Tom Scott of technology!

Pluveo 14/12/2021 - 6:48 Chiều

2:30 Why are there bananas in that fridge? Psychopathic.

JEZPP 14/12/2021 - 6:48 Chiều

Heat pumps have been around for many decades.

Kalle Jodelbauer 14/12/2021 - 6:48 Chiều

Thats only Physics,i dont know what you had learned in School,i had that at 4 grade.
But you need a Plumber whos counting what size you need to heat your Home.
You need more Gas to keep the Circiut running.That need an Expert to do it.
Dont expect that your AC heat the whole House,it had to be Bigger.
It can be dangerous to make a Heater from youre AC,the Companys want to go save.
Thats why it give Rules and Lawsuits,they sue you up to 2000000 Dollars for a
Coffee on your Trowsers.It works,but you need a Backup for extreme situation like a Blackout.

Josh Spohn 14/12/2021 - 6:48 Chiều

You can see the phenomena in a can of duster for computer keyboard. The spray can gets cold. In an a/c the compressor keeps the spray can full in a closed loop. Seems like when a liquid turn into gas it gets colder and when gas turn into liquid it heats up

Jailhouse Philosopher 14/12/2021 - 6:48 Chiều

The easiest way to defrost the evaporator would be to run an extra small line with a blockage through the evaporator, or a small heater element in it.

eric H 14/12/2021 - 6:48 Chiều

So, for those of us northerners with hot water baseboard heat, a heat pump is a no-go unless we want to install mini-splits ?

Justin G 14/12/2021 - 6:48 Chiều

I don't know where you're at, but I'm in northwest Ohio, the electric company has been offering a rebate for a heat pump. There is one at a house I considered purchasing that looks a lot like the one your patron has. The house is located in the country, where there is no natural gas lines, so even though it gets really cold here, it's still going to be more cost effective than baseboard resistive heaters.

jallxj91 14/12/2021 - 6:48 Chiều

Being engineer, and knowing well the internals of the A/C and Heat Pumps, i have to recognize this is one of the most educational and professionaly edited video I have ever seen. Congratulations!
Best regards from Madrid,

Briney Foster 14/12/2021 - 6:48 Chiều

ok I find this hard to believe. I lived in Florida for 25 years in a home heated by a heat pump. It was a newer, supposedly energy efficient unit but whenever the outside temp fell below about 45 degrees the emergency heat coils would turn on. They were very inefficient and costly, like trying to heat your home with an electric stove. The service technician said it was normal operation for a heat pump set up.

Stanley Parker 14/12/2021 - 6:48 Chiều

Great video. I replaced central AC with 4 split inverter systems five years ago. They have saved me a fortune in this TX heat. DIY install and repair info is easy YouTube find. There is an easy DIY way to add backup heat using a tank-less on demand gas hot water-heater, and small pump. Use cooling coils (auto parts store) placed on top of air intake. GOT HEAT. TX grid failure. This OLD Boy Scout is always prepared. Big generator chained to a tree and house filled with strangers.

John Weiner 14/12/2021 - 6:48 Chiều

At 2:37, "What we call temperature is really…", well sort of. At the risk of appearing fussy and pedantic, according to my high-school thermodynamics class, a temperature T is a parameter (a single scalar number) that is used to define a DISTRIBUTION of energy , called the Maxwell-Boltzmann Distribution, in a closed system that is observed in nature when the energy of the system is in contact and in equilibrium with an infinite heat reservoir at the temperature T.

Chris Moody 14/12/2021 - 6:48 Chiều

Why consumers don’t use heat pumps more is because the initial replacement cost is greater than conventional AC systems. Unfortunately people can’t see past the right now. I know I sell HVAC equipment. I try to inform customers the best I can to all available options. Some systems can save people money using higher efficiency equipment, but most the time people revert right back to the minimum expenditure right now.

sean Lavery 14/12/2021 - 6:48 Chiều

Pioneer mini split ducted concealed is what i have, high efficiency even in the cold winters of New York. It's some machine and way cheaper than Mitsubishi.

macbrush 14/12/2021 - 6:48 Chiều

Because of this video, I just purchased 2 inverter a/c's for my home. Hopefully they can save heating bill for me this year.

kdmq 14/12/2021 - 6:48 Chiều

If engineers can figure out how to make these work down to -40 C with a COP of at least 2 or so, they would work wonders where I live, the humidity gets so low on -30 and -40 degree nights that we won't really have to worry about defrosting the coil.

M. Tyler Ryan 14/12/2021 - 6:48 Chiều

7:46 Ayyy I went to college there :0

Michael W. Perry 14/12/2021 - 6:48 Chiều

When an unusual cold spell sent temperatures where I live down to 8 F, I used a heat-shifting trick to keep my electric bill from skyrocketing. In mid-day when the temperature rose into the low 40s, I turned my heat pump on and set the temperature in the 80s. When it reached that temperature, I shut it off and coasted through the night, letting the inside temperature drop into the 50s. The next day I repeated the cycle. I was only taking the heat from the outside when was warmest and thus cost the least to pump indoors. You might do a video on that.

Martinko Pcik 14/12/2021 - 6:48 Chiều

I am surprised nobody is thinking of combining the gas furnace with heat pump, providing majority of heating in mild temperatures and using the gas in the extreme weather. And it also provides cooling for summer

Martinko Pcik 14/12/2021 - 6:48 Chiều

This is a nice theory, but until someone can tell me about their experience with air heat pump in winter and their bill, for 2 winters, I will be not jumping a gun.


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