About basement parking lot heating
About basement parking lot heating
(OP)
Can i use hot water/fan heater in garage ? I have hotwater from rooftop. Mostly for garage heating, what heater is better?
But i didn;t find this device on net. Can u give me some idea?
But i didn;t find this device on net. Can u give me some idea?





RE: About basement parking lot heating
In the UK, the basement/garages aren't heated (unless you live in a really cold climate)
The biggest problem I would have thought, would be to ventilate it (not heat it??)
Anyway, a LTHW (Low temperature hot water i.e. 80/70C) water heater would be ok.
Generally, basements are fairly constant in temp (assuming you are below ground), so you shouldn't need much heat anyway.
let us have some more details..
Friar Tuck of Sherwood
RE: About basement parking lot heating
I have two levels of parking garage(1500m2 each).Level 1 is from 1m to - 2m, level 2 is from -2m to -5m.
When i use cold fresh air of -25C for ventilation, I should heat it. Is it right? So i need to heat it.
Look forward to your answer. Thanks!
RE: About basement parking lot heating
Online, i could only find electric heating system.:(
The ventilation rate for parking garage is large 3.9L/s.m2. so i get a lot of cold air, so i need heating.
Where to find the water heating system pictures for basement garages? I mean the suspended steel box(exchanger). Thanks!
RE: About basement parking lot heating
Try Engineered Air - http://www.engineeredair.com/
They are Canadian and have a number of lines of hot water fan coils, and also have gas fired (direct and indirect) make-up air units which you might find is better to use in a parking garage - rather than introducing the air cold and then trying to heat it.
As far as 'suspended water-coil fan powered heating device' try searching for 'fan-coil units' - or just go to McQuay, Trane, Carrier, or many others. They all have hot water coil fan units.
RE: About basement parking lot heating
http://www.rittling.com/products/uh.html
EngAir also has hot water unit heaters.
RE: About basement parking lot heating
Wufi, the most common heating practice I've seen out here has been the unit heater (usually Trane :B ) Being in gas country, natural gas is the normal fuel; not sure what area you're in, so I'm not sure what your normal fuel is, but unit heaters are available in oil- or gas-fired models. I second the suggestion of talking to Engineered Air; they are very good and know our climate variations inside and out.
In addition to unit heaters, I have also seen finned-coil heat exchangers used. These are less common out here because of problems with freeze-up. Here in Alberta, it is not uncommon to get cold snaps where temperature can drop to -30C or even -40C. Water in a finned-coil exchanger can freeze at these temperatures, as it loses its heat so quickly, so a glycol mixture is usually used in the lines, 50-50 being the norm. You will want to keep that in mind if you are still considering a water-filled finned-coil exchanger for your make-up air unit.
Hope this helps
-==- GeneratorGrrl
"Eat well, exercise regularly, die anyways."
RE: About basement parking lot heating
I want to post a photo of hot water-glycol coil/fan device. It's the thing like what GeneratorGrrl said and like ChrisConley's website. I'm here in Montreal. I saw a new parking garage is using water-glycol/fan coil. Do I need to design coil size or I directly buy it from some company?
Now i'd like to know how to heat water to a high temperature?
I have a boiler at rooftop level. How can i heat water and glycol mixture? Or can u tell me how to insert glycol into hot water? Glycol can enter boiler? I should mention there are some residential appartments upstairs. How they use hot water if glycol is in the boiler?
Thank you!
RE: About basement parking lot heating
You could add glycol to the boiler loop. The devices that heat the apartments can also take glycol. Glycol affect heat transfer though, and the apartments may not have enough surface for a glycol mixture. Rather than change the whole system you could create a separate loop, with the boiler heating a brazed plate heat exchanger heating a glycol loop, and then the glycol loop serving the unit heater. The link below is an example of what I’m talking about.
http://www
As to designing the unit, if you know the heat loss then you should be able to select the unit from the manufacturer's catalogues, which list units by capacity.
RE: About basement parking lot heating
They make LTHW Unit Heaters which would be ideal for you.
You need to heat the incoming fresh air. Glycol at 25% should do to protect from freezing but Glycol is very 'searching' and so valves should be packed using the right type of packing etc.
Sounds pretty cool at -25. Wouldn't it be cheaper to emigrate. I'm glad I don't have your energy bill.
Friar Tuck of Sherwood
RE: About basement parking lot heating
Yes, glycol can enter the boiler, but the residents in the building can use the hot water mixed with glycol for shower? Or how to seperate the heating system into two: one is for basement heating ,another is for residential faucet use, like shower, washing?
Note: Residents don;t use water to heat the appartments; they use HVAC VAV system.
Thanks again!
RE: About basement parking lot heating
The HVAC VAV system that ther residents use to heat their appartments must have some source of energy. Whatever that source is: use it in the parking garage as well.
Natural gas, oil, hot water coils or electric coils are all available for providing tempered air in spaces
RE: About basement parking lot heating
50% glycol(propylene) can take upto -350C and it should be 60% if you want to go below that. Specific heat of glycol solution is below 0.8 kCal/kg 0C and you have to pump in extra 25% fluid for a constant heat flowrate. Further, specific gravity of glycol solution is 1.032, so extra power for pumping will be around 3.2%. Thus your total pump power will be increasing by 29%. You have to check your existing pipe sizes for these increased flowrates. Viscosity is also a problem at this concentration and this increases pump power and reduces heat transfer rates.
You can't use glycol solution for shower. You can use separate heat exchangers for heating up water(as close to the shower as possible) as suggested in above posts but again there is an energy concern.
Personal
If you have to circulate heated medium as long as the ambient temperature is -450(or at any temperature lower than the comfortable temperature), then why you should go for any antifreeze solution?
Direct fired air heaters can be economic in your case.
Heat pump can also be a good option.
Environmental
I am glad for being at the other end of the temperature scale. It is +45 for five months in a year and there were cases when it was +40 at 9.00PM. The other day it was +15 and I was shivering down my spine.
RE: About basement parking lot heating
"Eat well, exercise regularly, die anyways."
RE: About basement parking lot heating
I think I might faint though at 45 degrees. Where are you...Saudi??
Friar Tuck of Sherwood
RE: About basement parking lot heating
Once while traveling through Greece, it hit 47C. I was sweating like crazy and complete strangers would come up to me with squirt bottles and fans trying to cool me off - I must've looked pretty hot. Children would point at me (exaggerating only slightly)
However, when 'spring' comes around here, and it hits -8C or warmer, I'm in shorts and sandals.
RE: About basement parking lot heating
h
This is what I see most commonly in local underground parking garages, and it is also what we use to heat our maintenance shop at my current jobsite. This is a natural-gas fired model, but I'm pretty sure there are oil-fired models as well; your local Trane dealers will have more information and be able to help you out with options.
"Eat well, exercise regularly, die anyways."
RE: About basement parking lot heating
1.The parking garage(about 40 cars) will share the boiler with the above appartments.Boiler is on the rooftop.The boiler also provides hot water for HVAC of appartments.
2.The boiler provides hot water for HVAC and basement; meanwhile, how to get hot water for shower/washing use? I need one more small boiler for residential shower/washing?
3.I'm worried about the unit heater will be freezing at -12F in Canada if the unit heater is using hot water from the boiler.(I'd like water coil-fan heater).
Thank you!
RE: About basement parking lot heating
wufi,
It may not be proper to have a common boiler for wash and shower as the loads are diversified and you may have to run your boiler unnecessarily for hours.
Generatorgrrl's link seems to be about a direct fired air heater and this is better when compared to hotwater coil types.
Regards,
RE: About basement parking lot heating
Quark:
I was using some B&G software that indicates that a 50/50 solution of propylene glycol has a specific gravity of .99 to 1.01 for the typical boiler heating application. (@180°F the SG is .99, @ 140°F the SG is 1.01)
WUFI:
You can use your HVAC boiler tied to an indirect water heater to provide domestic hot water to the suites. (Viessmann website has such tanks and if you used a condensing boiler the efficiency would increase at low load). So you can run the propylene glycol solution through the boiler.
As you cannot heat your parkade via a make-up air unit (code issues), you do require some unit heaters at doors and possibly around the perimeter depending on your heat loss analysis.
Another means of freeze protection is to ensure the loop has constant flow through the unit heater coils, run the fans based on thermostat demand.
RE: About basement parking lot heating
40 cars in a basement garage
I take it you are you ventilating this space?
If not then prepare to die by carbon monoxide poisoning.
In the UK we would have to ventilate to a constant rate of 6ac/hr and go to high speed (10ac/hr) if initiated by either a carbon monoxide detector or a fire alarm.
The fans would need to be fire rated at 300C for an hour and the system would need to be in 2 parts (we assume this means run/standby plant)
Ciao
Friar Tuck of Sherwood
RE: About basement parking lot heating
Thanks!
RE: About basement parking lot heating
Look in ASHRAE, they give a rate per vehicle or per HP
Friar Tuck of Sherwood