Room Cooling

[tjrose91]

How many BTU's should be able to cool a computer room or a 100sq ft or 9.3m2 (tiny house, shed, office whatever you want to call it) This unit stores and operates soon to be 2000w of pc equipment, will be adding an addtional 1000w per 6 moths till i exceed 30 amps 120v , the ac unit will be on its own separate 12g 120-240v line most likely i was looking at a 10,000 btu Vertical unit with possibly a portable ac unit at 8000 btu if i really need it figured it be easier to drill a 6 inch or 15 cm hole for the vent tube

 

i dont know how accurate this website is

 

https://www.netcomtech.co.uk/airconcalculation/

[Roswell]

None of that's going to work. 

 

If your electrical system is following code, the circuit feeding that shed is only going to deliver 15 amps (1800 watts), 20 in SOME circumstances.

 

Beyond that, 18000 BTUs of air conditioning is is like 6000W. Where are you going to get that from? It's not coming from your house's 240 circuit unless you're pulling out your regular house's 240 line and sacrificing it to your shed.

 

You're most likely going to need an entire electrical overhaul of your home with all new wiring. Probably need to get approval from your local government too for such use.

[CerealExperimentsLain]

9 hours ago, Roswell said:

Beyond that, 18000 BTUs of air conditioning is is like 6000W. Where are you going to get that from? It's not coming from your house's 240 circuit unless you're pulling out your regular house's 240 line and sacrificing it to your shed.

Your math here doesn't quite work out.  You're using the calculation of watts to BTU when converting electricity to heat, but an air conditioner can do far more BTU with less watts.  It's important to remember that an air conditioner is not converting energy, it's just moving it.  A typical 10 000 BTU window unit, if you get an efficient one, runs you closer to 800w.  So in short, air conditioning is more efficient per watt than electric heating.

 

You can literally buy 15000 BTU window units that run off 15amp circuits at any hardware store.

[tjrose91]

On 6/9/2021 at 8:56 AM, CerealExperimentsLain said:

Your math here doesn't quite work out.  You're using the calculation of watts to BTU when converting electricity to heat, but an air conditioner can do far more BTU with less watts.  It's important to remember that an air conditioner is not converting energy, it's just moving it.  A typical 10 000 BTU window unit, if you get an efficient one, runs you closer to 800w.  So in short, air conditioning is more efficient per watt than electric heating.

 

You can literally buy 15000 BTU window units that run off 15amp circuits at any hardware store.

possibly yes, this is to cool a computer room or office, or shed to keep the components cool at 80c or less

[tjrose91]

On 6/8/2021 at 11:43 PM, Roswell said:

None of that's going to work. 

 

If your electrical system is following code, the circuit feeding that shed is only going to deliver 15 amps (1800 watts), 20 in SOME circumstances.

 

Beyond that, 18000 BTUs of air conditioning is is like 6000W. Where are you going to get that from? It's not coming from your house's 240 circuit unless you're pulling out your regular house's 240 line and sacrificing it to your shed.

 

You're most likely going to need an entire electrical overhaul of your home with all new wiring. Probably need to get approval from your local government too for such use.

I have a 30 amp 240v line, i dont have a dryer so i used that circut for the 240v extenstion line, so the sub panel has a 20 amp breaker and 15 amp breaker, people tell me that the load is cut in half yes if its a true 240 but the 10/3 wire must be able to return the current at less than 30 amps, so the main breaker is 30 amps 

 

 

i found a vertical AC unit for about $400 might wait till august as it should be on sale then, 

 

but shortly, 

 

30 amp 240v line going to a sub panel that breaks out to a 20 amp and a 15 amp breaker, plan on keeping the coninous load under 20 and 15 amps so the overall return current is less than 30 amps for the neutral line, as the subpanel shares that line with both 120 lines in the subpanel with pc equipment, and the AC unit on its own 120v 20 amp on an extension cord in a grey conduit pipe

[Pixel5]

On 6/9/2021 at 5:44 AM, tjrose91 said:

How many BTU's should be able to cool a computer room or a 100sq ft or 9.3m2 (tiny house, shed, office whatever you want to call it) This unit stores and operates soon to be 2000w of pc equipment, will be adding an addtional 1000w per 6 moths till i exceed 30 amps 120v , the ac unit will be on its own separate 12g 120-240v line most likely i was looking at a 10,000 btu Vertical unit with possibly a portable ac unit at 8000 btu if i really need it figured it be easier to drill a 6 inch or 15 cm hole for the vent tube

 

i dont know how accurate this website is

 

https://www.netcomtech.co.uk/airconcalculation/

30 amp 120V will give you 3600W at most so you wont be adding much more after you have added that extra 1000W in 6 months.

overall unless you live in an insanely hot climate you wont even need any AC unit you can just add good ventilation to the shed and be done with it.