Sizing water requirements for comml laundry

techheat_2

for commercial laundry. Has 2 350lb machines and 2 75 lb machines. Bock recommends 1.5 gph per lb. does anyone have any experience with this. 1325 GPH seems huge

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jackchips_2

Gas or

oil, although my advice is for either.

Pick a manufacturer your comfortable with, give them your requirements and go with it. I haven't done one in a while but most manufacturers would back up their engineering and product if you had a problem.

There are engineering guides (ASPE Hot Water Guide is excellent)that will give you data you can use to get closer to the GPM you actually need (manufacturers are usually very conservative) but then your on your own if you don't meet the demand.

Good luck.

Bill_14

What is the required water temperature? Health care facilities require at least 160*F. I would assume 140*F. is acceptable otherwise or even 130*F.

How many hours a day and how many days a week will there be a consistent need for hot water?

Generally, a commercial laundry needs about 2.5 gallons of hot & cold water to wash 1# of clothes per cycle with about 70% being hot water and 30% being cold. This being a quick check, that would require about 1.75 gallons of hot water per cycle.

Let your manuafacturer guide you.

JackFre

From another angle

I've been doing a bunch of laundromats with Rinnai on demand systems. For the coin op type we have used anywhere from 4-8 units, depending of course on the number and #age of machines. Your Kahuna 350's require that before I could size that type system I'd have to know what the flow rate to each of those machines is. How long is the cycle. At this time I have about 12 laundromats across New England working very well with these units. I have one commercial laundy in Portland with 5 units on it working fine for the last 3 yrs.

The flow rates are problably pretty high for fill rate. If you can get that number I can give you an option.

Mark Eatherton1

I've found...

the RayPak sizing guide to be the best. Don't forget to compensate for altitude...

Assuming 40 degree F inlet water, 180 degree max water temps, they reccommend a 3,000,000 btuh boiler and a 1,953 gallon tank for their 75% storage, 25% recovery system.

My experience with commercial laundries WAS that they required 180 degree F water to activate the chlorines in their detergents. Things may (hopefully have) changed since then...

ME