C
Chillville
Premium Member
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Ok, well I have just built a 10x8x8 room in the garage all insulated dry wall on the inside as well as the out, I have also caulked every seam in the room as well as epoxied the cement floors. I have bought a bryant 56k btu furnace with a matching 2 ton bryant central air unit. I will be running 4 raptor 1000 watt un air cooled as well as 2 horizontal 1000 watts in the room. ballasts will be on outside of room co2 will be pumped from a tank to minimize the heat. The temperature outside is never the same michigan itll be 70 for one day an 100 the next lets just say around 80 degrees. I will be keeping the room at 80 degrees while the co2 is being ran. Do you think this 2 ton system will run constant instead of shutting off an on constantly ?
Sorry for the late response, I was out of town last week. I would not recommend only a 2 ton for 6k watts. You are creating 24k BTU of heat with the lighting and only a 24k BTU in cooling at best. I would either suggest upgrading to a 3 ton or switching/dimming to 600 watts instead. You are no doubt going to have trouble when the temps get above 85.
I wanted to comment on oversizing cooling systems, what people told you about the 3 ton using more electricity isn't exactly true. Let's say I need exactly a 2 ton cooling system. With this cooling setup my compressor never shuts off while the lights are on. Lets say I change this system out for a 4 ton and now my compressor will run 50% of the time. For the most part these 2 a/c's will use the same amount of electricity per hour....the larger one uses more power but it runs less. There is one factor here though that I need to mention. Startup amperage for a compressor is different from the running amperage of a compressor. Running amperage is usually 60% of the startup BTW. Its not a considerable difference because these startup amps are only for a brief moment. So with our example if you have a 2 ton compressor running constantly vs a 4 ton running 50% of an hour the 2 ton will use slightly less power but its negligible. A 3 ton would have ran approximately 75% of the hour which is what I recommend...this gives time for the equipment to cool off between cycles extending the life of the cooling system.
With that said there is a significant reason not to oversize an a/c and that is for dehumidification purposes. A/c's can only dehumidify while the compressor is running and although you are dehumidifying more with a larger unit since it doesn't run as much you won't get as much condensation out of it.
I know that you have already purchased and a/c so this infor won't help you but a chiller systems do not work that way. I can design a chiller system using a 5 ton when only needing a 2 ton that works perfectly. With chiller systems you are able to add water volume and store cooling energy allowing you to dehumidify without the compressor running. Also with a larger water volume can you adjust the compressor run time so that it doesn't cycle on and off to often.
I read on the watercooledgardens.com website that having my chiller run continuously was the most efficient way to do it, and that having it cycle on and off a lot was actually detrimental to the unit's longevity. I'm a little lost here...
Also, I'm cooling a sealed room with 8x1k HPS with a 2 ton chiller. I know we've talked about it and I did say my ballasts are elsewhere and I'm cooling my hoods with outside air, but I know I'm very close to the capacity of the system. If the chiller needs to shut off regularly, I'm up shit creek, right? Or am I?
I read on the watercooledgardens.com website that having my chiller run continuously was the most efficient way to do it, and that having it cycle on and off a lot was actually detrimental to the unit's longevity. I'm a little lost here...
this not true the most efficient way for a chiller to work is to be off for atleast 20% per hour. i.e. during a hour of your on cycle the chiller should have the water cold enough for it to turn off for a minimum of 12 minutes per hour. if your run the chiller non-stop the compressor never gets a chance to cool off which makes it run less efficient using more power for less cooling and it will also shorten the life of the chiller.
i think you miss understood what they were saying. they mean not to have the chiller on a timer and have it plugged in and turned on all the time. this is more efficient than the chiller having to chill the water down from heat agthered while unit was off.
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