On Thu, Jul 20, 2017 at 7:20 AM, Olivier Jennes <olivier@******.***, wrote:
Hi Robert,I was doing some research on portable air conditioners and I came across one of your pages: http://livingstingy.blogspot.d
e/2010/05/shoul-you-buy-portab le-air-conditioner.html, which I found informative and well-written, so I was wondering if you wanted to have a quick look at an article about portable air conditioners we just published.After doing weeks of independent research about all available brands of portable air conditioners, we published the results in a blog article. Please note: we are in no way connected to any of the brands, we are just a blog with a passion for art, design and everything to do with home.Here is the article: http://******/the-best-portable-air-condit ionersIt reflects a summary of the feedback from people around the world - I'd love to know what you think!Feel free to send your thoughts by email, or, if you prefer, you can also leave your thoughts in the comment section at the bottom of the article. And if you like the article you would make us very happy with a mention on your website :-)Best wishes and thank you,Olivier JennesFounder***********.**Twitter: @*******www.facebook.com/***********
These two paragraphs are confusing in describing how these units work:
"Single hose units will pull the air from within the room, cool it, and send it back into the room. It then vents warm air and moisture out of the outtake hose that is mounted to the window with a simple removable frame. With single-hose units, this is where auto-evaporative technology helps keep the machine running efficiently by cooling the unit. For less consistent use, like in locations with warm afternoons and cool evenings, a single-hose air conditioner is generally sufficient."
The evaporative function is used to discharge the condensate that forms on the cooling coils. It has little to do with "cooling the unit" and it appears you don't understand how these units work at all. In addition, the evaporative function is present in both single and dual-hose units.
(when cold air passes over the evaporator coils, it falls below the dew point, causing water to condensate onto the coils. This drips down into a drip pan. In a house A/C unit, this would then drain outside via a hose. In older portable A/C units, the drip pan or condensate pan would have to be emptied on a daily or even hourly basis, depending on how humid the environment was. Modern units use the edge of the evaporator fan to splash this water onto the warm components such as the compressor, causing it to evaporate again, at which point it gets blown outside with the discharge air. Some window units use this technology as well. It also does serve to cool the compressor somewhat. But that's not the point! The point is to avoid having to drain the damn drip pan all the time! Even with this technology, the drip pan may need to be emptied when the room is first cooled, before the humidity level is pulled down. Once the room is cool, the need is less, which is why it is a good idea to leave these buggers on all the time, rather than try to turn them on and off during the day).
The problem with single hose units is that they are taking air from the room and discharging it outside. You are taking the cooled air, using it to cool the condensor, and then discharging it. This is less efficient. But worse than that, if your home is tightly sealed, the fan discharging air may have to fight to push air out the hose, as there is no air coming into the room. For this reason, they often recommend opening a window a crack to let air in, which again, negates efficiency.
"Double hose units have both an intake and an outtake house. Air is pulled into the interior intake (the unit itself), cooled by the coils, and then sent back into the room. As the machine warms up, the intake hose (hooked to the window) brings air from outside in order to keep the unit from overheating. The outtake hose then removes the heat and moisture just as it does for the single hose systems. In larger spaces or spaces filled with computers or other warm electronics, the two-hose system is ideal for optimum cooling and to ensure the longevity of the unit."
Again, this seems to illustrate that you have no fundamental idea of how air conditioning works. While I suppose you could say this is technically correct that it "prevents the machine from overheating" it is really not accurate. An air conditioner is a heat pump - it moves heat from point A to point B. A reversible heat pump can pump heat in both directions, so it can heat or cool.
When you run an A/C unit - ANY KIND of AC unit, you are rejecting heat outside of the room. The point of these ducts is to reject the heat (hot air) in this case, which is generated when the refrigerant is condensed in the condenser. This is where a lot of people get confused about these units - they think you plug them in and the unit turns electricity into "cold". No, it takes the heat out of the room and pumps it outside. If you don't connect the ductwork, you are just pumping heat around in the same room. The two-hose solution is more efficient than the one-hose solution, as you are using OUTSIDE AIR instead of INSIDE AIR to remove the heat. So you are not cooling air (as in the single-hose unit) and then blowing it outside. It has nothing to do with "overheating" but rather improved efficiency.
The ducts don't prevent the unit from "overheating" but allow the unit to function. These units don't really "overheat" by the way, they would shut off if the flow of air to the condenser was blocked (the high pressure refrigerant switch would kick off).
All of the bolded statements in your article above are inaccurate. I bring this to your attention in that you don't want to make yourself look foolish online.
I have not reviewed the rest of the article in detail. I think you need to do some research on how air conditioners work, and in particular on how portable air conditioners work, before writing an article about them.
Dear Robert,Thank you very much for your reply and your feedback, that is very kind and helpful!I full agree with everything you said there. We broke the contract with the copywriter who wrote this for us as after further inspection I agree the text is unclear and factual wrong in many ways. I now have my main copywriter reviewing and correcting the article (luckily she is amazing) and I will let you know once this is done. Thanks again for sharing your opinion, this is super helpful.Best wishes,Olivier
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