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System 6.7 kWh + 2 PowerWalls - Will It Cover 100% of my Usage?
- Thread starter ftrv8
- Start date
These are very different fans with very different performance.
The Quietcool is 276 whats for 1434 CFM or 5.2 CFM / watt.
The Triangle is 303 watts for 9700 CFM or 32 CFM / watt.
The Triangle is 6.2 times more efficient but it's also a lot larger. The low setting requires 3 windows open to not create a vacuum. The fast setting requires about half the windows in the house be open.
Low setting which is what we pretty much always use. With this size fan it's CFM is enough to cycle the entire volume of air of the house in about 4 minute.
High speed occasionally used like if we don't leave the fan on all night but turn it on at 5 am and need to cool the house as fast as possible before the heat kicks in.
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9,700 CFM is the equivalent of what like a 24 ton HVAC system air handler. That seems like a ridiculous volume of air to move in 60 seconds with a fan that size. Something doesn't seem right lol.
When this thing is on, do you just feel air gushing out of your house? I can't imagine that type of pressure being created by only 300 watts. I remember the office having an air handler doing 10,000 CFM and it was a huge contraption with a lot of fans.
I have a quietcool stealth series 7000 which, on high, uses 700w I think. You have to be ok with the amount of outside air they bring in, but I got it last year this time, and it cut my summer AC use by like 90%. Where I live, however, is characterized by hot days during the summer, but in general cool evenings with the exception of late august into september or so.
The corporate headquarters of quietcool is in my town, so its no surprise that they function extremely well here.
The air is a strong wind at any window or in the hallway on either side of the fan where it's concentrated. In big open spaces like the living room, it's a light breeze almost anywhere you are becoming stronger and stronger as you move either towards the central hallway or an open window. It's many times the flow of my larger 4 ton HVAC.
They have 3 lines of fans. the ES line is the cheapest (and least efficient I believe). I have this one:
Hmmm weird I was going off the amps; not the watts. 8.61 amps at 120v should be 1 kW.
I wonder if they'll ever make automatic windows that open when the attic fan switch is turned on. Would be cool (literally?).
I wonder if they'll ever make automatic windows that open when the attic fan switch is turned on. Would be cool (literally?).
Notice how to get 50% more CFM the power has to increase by 400%. This is why larger diameter bladed fans are more efficient. It's similar to why it takes a non linear increase in power to approach the speed of sound.
I have QuietCool fans, and I'm planning on doing almost exactly this with my Home Automation - whenever the outside temp is cooler, it would send me a message, then when I open any downstairs window, it would turn the fan on and HVAC off. And reverse, if I close all windows, stop the fan.
One wrinkle I have with this plan currently is there are active Skunks in the vicinity, so I need to detect that smell and not be pulling it into the house.
The QC fans are awesome in my climate.
Yeah, but can the system open and close the windows automatically? Like are there any integrated smart-home solutions for double or triple pane windows to slide open with some high-torque stepper motor or something? Like this thing... but you know... something that doesn't look like a hack.
Z-Wave Skylight/Window Openers
ZWAVE Window Opener: how to set up a motorized remote control window opener (actuator) for ventilation control, window or skylight opening, shutters - use RollerTrol™ 12v DC chain actuator with our Z-WAVE remote control systems.
If they make drive-through windows that can open/close when the person steps on a foot-switch... and they make skylights that can prop open and close... you figure somebody would sell a smart-double-hung window to integrate with a Quietcool to make sure people don't have to open a window manually in the morning and evening.
Yes, I am this lazy haha. I have automatic shutters so I don't have to walk around the morning and evening to adjust light. I am also able to avoid using that labor intensive remote control, so I just yell at Google to turn on my TV and change the channel. Yes, I set my AC to 75F yesterday when it got 101F outside because solar is glorious. Technology is awesomes.
Who uses crank windows without screens?
This looks more promising but it's like some random Aliexpress thing...
This looks more promising but it's like some random Aliexpress thing...
I believe that a really simple way for this is to use a solar hot water controller; whenever there is the specified temperature difference between the "cold" outside and the "hot" inside, the relays close. What you have on the relays is all up to you power windows, vents, fan...
All the best,
BG
All the best,
BG
Mechanizing sliding windows still seems like the wrong solution here. The other idea I had was to copy what is done in commercial high rise building HVAC, there's a fresh air intake somewhere in the system on the return vents that can be opened with a duct damper to combat rising CO2 concentrations, but would also work to allow the whole house fan to work, and would keep the incoming air filtered properly.Yeah, but can the system open and close the windows automatically? Like are there any integrated smart-home solutions for double or triple pane windows to slide open with some high-torque stepper motor or something? Like this thing... but you know... something that doesn't look like a hack.
Z-Wave Skylight/Window Openers
ZWAVE Window Opener: how to set up a motorized remote control window opener (actuator) for ventilation control, window or skylight opening, shutters - use RollerTrol™ 12v DC chain actuator with our Z-WAVE remote control systems.rollertrol.com
If they make drive-through windows that can open/close when the person steps on a foot-switch... and they make skylights that can prop open and close... you figure somebody would sell a smart-double-hung window to integrate with a Quietcool to make sure people don't have to open a window manually in the morning and evening.
Yes, I am this lazy haha. I have automatic shutters so I don't have to walk around the morning and evening to adjust light. I am also able to avoid using that labor intensive remote control, so I just yell at Google to turn on my TV and change the channel. Yes, I set my AC to 75F yesterday when it got 101F outside because solar is glorious. Technology is awesomes.
A system like that wouldn't provide enough volume or cooling where needed or cooling everywhere with select windows opened up around the house.
I have positive pressure system that uses a 400 cfm fan and pulls air from a roof vent and through a 3 stage HEPA filter and pumps it into the house via a duct that is centralized in the middle of the house. It's there to prevent CO2 build up which became an issue during covid when we were all at home all of the time working and remote schooling.
A side effect is that it also seemed to kill dust build up in the home because the slight positive pressure it creates keeps dust from coming in through other fan vents, open doors, or anywhere there is not a perfect seal around the house.
It's turned off now because we're using the whole house fan daily after the temperature goes down. If the valley air gets really bad like it did last year, then we'll keep the window closed and turn the positive pressure system back on and just use AC which will cost more but the at least the smoke won't be coming in. So far this summer, the air quality is excellent.
Have not been able to use my whole house fan the last couple of days since the low morning temps are low 70's. Wife said upstairs at 74 was a tad cool, so raised to 76. I have left my down stairs, with bedroom and exercise room at 74 so far. Boy has this AC made a difference in my battery use. The grid has been running the house, since my limited solar is going 100% to charge the batteries which are connected to the AC, by 3pm. So, not limited on batteries, even though I was at 38% this morning, limited by the amount of solar to recharge fast enough to not have to pull some grid energy.
What brand / type do you have? Just curious. I am intrigued by the dust suppression effect.
All the best,
Peter
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