Joined on August 4, 2012
Last Post on December 3, 2012
@ December 3, 2012 10:52 AM in Glycol heat lossSo there's really no efficiency lost as long as you pump more water through the boiler? The 399k boiler has a minimum flow of 19 gpm at full fire so is this the number i need to use?
@ December 3, 2012 2:05 AM in Glycol heat lossHow much efficiency is lost by putting 30% glycol through a boiler like a Triangle Tube Prestige? I understand glycol is inferior at heat transfer. After lots of googling all I found was that you may need more feet per second through the exchanger.
@ October 11, 2012 12:57 AM in piping optionsOk, I've been convinced to install a condensing boiler. Can i run the water from the softener (about 50 psi) into the boiler and then circulate that same water through a hot water storage tank (for using at the spray wands) and a through a heat exchanger for the glycol floor heat. (use a separate glycol pump)
for reference here's my other thread
@ August 15, 2012 12:13 AM in Carwash glycol floor and hot water systemAssuming I'm going from potable water through the boiler and then to the glycol how do I size the heat exchanger. I think the glycol would be 45 degrees and the water 135 then coming back as cool as possible to help with the condensing. Thanks, John
@ August 13, 2012 11:48 PM in Carwash glycol floor and hot water systemI guess the exchanger setup you suggest is the opposite of what I was thinking. I was going to run city water through and to the wands and let the glycol be on the heat exchanger loop. As I understand it the glycol is less efficient at heat transfer so I'm losing my efficiency gained with a condensing boiler.
@ August 13, 2012 4:50 PM in Carwash glycol floor and hot water systemThis is the glycol boiler, circulation pump tag and solenoid valves that let the hot water in before the pumps.
@ August 13, 2012 4:35 PM in Carwash glycol floor and hot water system9 gpm for the wands and 1700 square feet for the glycol floor heat. Incoming water is about 60 degrees and from what I have learned floor heat is 1-200 btu per square foot.
@ August 12, 2012 10:17 PM in Carwash glycol floor and hot water systemI really don't know. There are no slab heat sensors. Both boilers are direct vent so I'm sure that's a substantial waste. They also weep hot water and I'm hoping cold will do the trick.
@ August 12, 2012 9:11 PM in Carwash glycol floor and hot water systemYes I see the point. There's currently a 900000 btu raypak for glycol and a 1100000 btu raypak for the floor. Gas bills ran 3800 in the high months. The Navien I looked at was 98% efficient and was rated for the use with a 10 yr warranty on exchanger. I just bought the Carwash.
@ August 12, 2012 8:32 PM in Carwash glycol floor and hot water systemI believe 9 gpm considering derating for rinsing, foam, waiting etc. and 1700sf of floor heat.
@ August 12, 2012 8:22 PM in Carwash glycol floor and hot water systemI have only about 1700 sf to provide floor heat for. (other bays are shut down in winter.) From reading online it seems that about 100 btu per sf. I was thinking with a properly sized pump on a vfd to control return temperature I could get the units to fire properly... Though with 3 I wouldn't need full fire. Another wash owner has run floor heat with glycol directly in the tankless for 9 years. It would probably run half the time for 3 months per year and the rest of the time be just providing wand water.
@ August 12, 2012 5:55 PM in Carwash glycol floor and hot water systemI do see your point. What I'm wondering is if I have 3 of them that rotate service on a cascading system won't this help the longevity issue. How do I post pics?
@ August 12, 2012 5:49 PM in electrical questionMost likely just a high resistance connection from an improper install. The breaker, fuses, overloads etc would trip first if it were a load issue. You can probably just replace the lug..... You won't know until you pull the lug off and see the extent of the damage. Fuses may not be required but they have a higher interrupting rating than breakers and may have been specced. As far as fuses or breaker undersized this is not a problem if they're not tripping.
@ August 12, 2012 5:12 PM in Carwash glycol floor and hot water systemHello, I'm trying to design and then install a system for a Carwash. I'll tell you what I'm thinking and then you can get out the red pen! 3 Navien 240 a tankless with circulating pump and a heat exchanger with glycol for the floor heat in the bays. So softened water would run through the Naviens and circulate for floor heat and probably an air exchanger for heating the equipment room. I want to add pics but the option is grayed out.