Timeline for Can I use an overpowered mini split to rapidly cool a space?
Current License: CC BY-SA 4.0
33 events
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| Dec 23, 2023 at 7:15 | comment | added | zed | Wolfram Alpha does all the unit conversions, that’s not a problem. | |
| Dec 22, 2023 at 14:20 | comment | added | Aldus Bumblebore | I know nothing about A/C but I suspect your formula went wrong when you mixed metric and standard units. Doesn't seem right unless this is an industry standard equation with a fudge factor built in that I am not noticing. | |
| Dec 22, 2023 at 6:58 | comment | added | KMJ | @Harper-ReinstateMonica short cycling can happen on mini splits. It's just less likely because of the ability to modulate over a broad range, and you don't notice it as much since they short cycle at minimum power when it happens. Ideally for most of the the more common season (heating or cooling) for the best efficiency and latent heat control you want to be in the modulation range as much as possible to avoid cycling at all. Way more discussion about this over on GBA at greenbuildingadvisor.com/question/… | |
| Dec 22, 2023 at 4:00 | answer | added | Edwin Buck | timeline score: 3 | |
| Dec 22, 2023 at 2:18 | answer | added | bill333 | timeline score: 0 | |
| Dec 22, 2023 at 1:58 | comment | added | Harper - Reinstate Monica | Short cycling isn't a mini-split problem. It's only a problem for obsolete bang-bang control A/C's, which run at 100% power or stop altogether. When the mini-split reaches target temp, it will slow down to a sustain speed, not stop, so the short cycle doesn't happen. | |
| Dec 21, 2023 at 22:49 | answer | added | J.C. | timeline score: 0 | |
| Dec 21, 2023 at 22:22 | comment | added | zed | The optimistic numbers put out by my formula gave me some unrealistic ambition as to what cooling rate is reasonable to attempt. | |
| Dec 21, 2023 at 22:04 | comment | added | John Hanley | One last item. If you cool from 90 to 62 and humidity is high, you can pass the dewpoint. That means it might rain inside your garage or cause condensation on the walls, windows ceiling, etc. Mold loves wet environments. | |
| Dec 21, 2023 at 21:39 | history | edited | zed | CC BY-SA 4.0 |
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| Dec 21, 2023 at 19:56 | comment | added | John Hanley | The arguments regarding only needing to cool the air are not valid. The walls, floor, ceiling, etc are heaters. You must calculate how many BTUs per hour those structures radiate. Then you must also factor heat transfer from outside to inside. In summary, an 18K unit is small for a typical garage and will probably severely underperform for you use case. | |
| Dec 21, 2023 at 19:40 | comment | added | John Hanley | Using a minisplit for on-demand cooling might not save as much as you expect. Not only do you need to cool the air but also remove the thermal mass from the structure which requires far more BTUs than air cooling. Then there is the constant temperature changes which are terrible for the structure, walls, paint, humidity, mold, etc. For a garage, 18K might maintain temperature if ran constantly. An 18K unit will take several hours or more to cool down from 90 degrees. Factors like insulation, windows, sun orientation require many more factors than you are considering. | |
| Dec 21, 2023 at 19:40 | answer | added | Bryan | timeline score: 1 | |
| Dec 21, 2023 at 18:58 | comment | added | MonkeyZeus | An overpowered A/C can cause condensation problems because it didn't have enough time to dehumidify. If you know which hour you plan to use the gym then consider getting a WiFi or bluetooth controlled unit so that you can adjust the climate 1-2 hours before use. | |
| Dec 21, 2023 at 18:28 | comment | added | barbecue | How about just pointing a fan at yourself when you start working out? The fan will provide some immediate cooling, and as you work out and get hotter, the AC is bringing down the temperature in the room. | |
| Dec 21, 2023 at 12:08 | history | became hot network question | |||
| Dec 21, 2023 at 9:26 | answer | added | bobflux | timeline score: 12 | |
| Dec 21, 2023 at 8:26 | comment | added | Solar Mike | Why not just use a timer to come on 2 hours before the time of use? and off after, that would change the running time to approx 4 hours per day instead of 24... | |
| Dec 21, 2023 at 7:03 | history | edited | zed | CC BY-SA 4.0 |
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| Dec 21, 2023 at 6:12 | answer | added | KMJ | timeline score: 2 | |
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| S Dec 21, 2023 at 4:08 | review | First questions | |||
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| S Dec 21, 2023 at 4:08 | history | asked | zed | CC BY-SA 4.0 |