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Old 07-11-2013, 12:47 PM   #51
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Re: Lets talk AC again

The local meteorologists came through and delivered an especially hot day yesterday for my A/C testing. Here's my report.

The bus was parked facing due east in full sun all day long. I set a window A/C unit on a stool inside against the north wall about 1/3 down the length of the bus and hung a tarp (folded in half, so it's double-layer) to separate the front from the back. Note that I was mistaken on the capacity of this A/C: it's actually a 10000 BTU unit; earlier I had reported it was just 8000. I closed the doors, windows, and roof hatch in the front portion of the bus. In the back portion I opened the window beside the A/C, the roof hatch, another window, and left the rear doors hanging wide open to provide ample opportunity for the hot air off the A/C condenser to find its way out. I finished the setup and turned on the A/C around 10:00 am and left it for the day.

Temperatures were checked at a few times in the afternoon and evening with a "type K" thermocouple attached to my multimeter:
4:30 PM - 103 in the sun outside; 86 in the breeze in the front seat ahead of the A/C
6:20 PM - 99 outside in the shade; 91 in the middle of the conditioned front area inside. Evaporator discharge 59, condenser discharge 151, hottest area near the back window of the bus was 112. The headboard (?) surface above the windshield was plenty hot!
8:00 PM - 89 outside in the shade; 76 inside. Condenser discharge 137 and warmest point in the rear 96.

Because of the orientation of the bus the solar heat gain through the windshield grew as the afternoon wore on. By 8 pm the windshield was fully shaded by a nearby building and the interior air temperature corresponds to that.

Sooo, I learned a few lessons: don't drive east in the morning or west in the afternoon. Removal of most of the side windows and tinting of what remains will help keep gain while pointing north or south under control. Heat gain through the windshield is brutal. Not sure how I'm going to control that.. I wish there were a solar control window film, like the Solar Gard I used in my last bus, but in a static cling form instead of permanent installation so that I could easily stick it up inside the windshield for just a few hours while it's needed and then remove before driving in the dark.

Fighting that solar gain 10000 BTU didn't go very far. Probably the back portion of the bus, after I remove most of the windows and insulate like a madman, will need less than this. But for the front passenger area I'm not sure what I'll do. Probably will end up finding a way to make a bigger generator acceptably quiet so that I have electric power budget to run a larger A/C up there. Sure would be nice to shave off that direct sun peak, though -- once the sun quit shining on the windshield temperatures inside got pleasant really fast.
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Old 07-11-2013, 12:52 PM   #52
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Re: Lets talk AC again

You were still exhausting hot air from the AC unit back into the bus, dont forget that. ;)
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Old 07-11-2013, 12:54 PM   #53
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Re: Lets talk AC again

Quote:
Originally Posted by Malkieri
The 20lbs holds pretty well on the roof of my bus.... (holds a lantern anyhow) and it does take effort to remove. They have a 45lbs 1 as well... http://www.homedepot.com/p/Super-Mag...5#.UdkCKvnTogI If you are concerned about hold, I am sure the 45lbs will hold any blanket you got. Maybe set up a hammock for a small child with em when your tests are done.... I am sure you can find a use for a 45lbs magnet with carabiner, and we do expect pics. I can't read.... so without pics I don't know what you did.
Ok, ok, yeah I don't have any blankets that heavy. Not sure I have any that are 7 feet tall and 8 feet wide, though!
I did got get a pair of those magnets and I was pretty excited about them. My boys were too: they thought that the idea of bouncing in their "johnny jump-up" chair in the aisle of the bus was a great idea. At least, if they could talk, I'm sure that's what they would have said. It turned out that even the 45 lb magnet wouldn't hold the chair and the baby up. And I was so gonna post a picture and/or video for you, but since it didn't pan out.. sorry!
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Old 07-11-2013, 02:51 PM   #54
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Re: Lets talk AC again

I was experimenting also and added a pc of doubled over UV stable plastic screening
it works awesome and the landscape material is even thicker (if it ever comes in )

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Old 07-11-2013, 02:57 PM   #55
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Re: Lets talk AC again

I bet using that is when your driving skills are best.
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Old 07-11-2013, 03:32 PM   #56
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Re: Lets talk AC again

Quote:
Originally Posted by opus
I bet using that is when your driving skills are best.


actually in the day time you can see out very,very good...in not so much

at night it's the opposite
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Old 07-11-2013, 05:03 PM   #57
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Re: Lets talk AC again

Quote:
Originally Posted by bansil
I was experimenting also and added a pc of doubled over UV stable plastic screening
it works awesome and the landscape material is even thicker (if it ever comes in )

*Waves like a madman*

Bansil! BansilBansilBansilBANSIL! You just gave me a doozy of an idea! Take that plastic screening and roll it around a do-ma-hickey and slid it inside a PVC pipe with a cut in it so it can essentially act like a set of solid blinds. That way ya can hook it up to the top of the windshield on the inside and lower it or raise it while inside. Use magnets (or a stopping clip like in regular blinds) to keep it connected to any metal around the windows so it doesn't roll up all by its onesy. Massive custom solar blinds!

Would that work or had the Engineer in me gone loco?
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Old 07-11-2013, 05:18 PM   #58
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Re: Lets talk AC again

I have one 15,000 btu rooftop ac in my dognose bus. It is a 65 passenger bus. It's placed right about in the middle from front to back. With all the factory windows gone, and 2 inches of pink foam in walls, 1 inch on the floor and 1/2 inch in the ceiling, it keeps the bus cool. That was the big thing I was worried about when putting the bus together was going to keep it cool enough. Its black too. I live in Iowa and we have the high heat and humidity too. On a high 90's day it will cool it down to the 73-74 degrees. The biggest problem like been said, is the front ,with the windows, front door and engine. While parked I always put that foil roll insulation in the front windshield and drivers window. Works great. As soon as I pull it out of the window, while the AC is on, you can tell a major difference in temp. Traveling down the road is never as good. We just got back from from a 1400 mile trip. When its in the mid 90's and direction of sun it makes a big difference on temp inside. I keep a cheap themometer right by the driver seat. Hottest I seen it read while going down the road was about 84 degrees. I think alot of that was engine heat blasting at me though. I have added foam around the doghouse, but after this trip I think I might try and add more. Here's a pic of what I have now(from our trip), I'm thinking I need to foam the whole dash.

My family a few feet back were not nearly as uncomfortable then me. Of course I like it cool anyway. The back of the bus is always cool going down the road. I think I might try and block the back of the bus off while driving, to maybe keep more cool air up front.
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Old 07-11-2013, 07:12 PM   #59
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Re: Lets talk AC again

Uncomfy as pops?.......Hell no!...they got waffles and her coozy matches our drapes
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Old 07-11-2013, 07:19 PM   #60
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Re: Lets talk AC again

Das mel
It works better outside to cool and shade the glass,inside it will heat up the air between them

Landscape material is as dark as this is doubled up,when parked snap etc to front and leave you can put foil behind it inside the windsheild

Foil wrapin windshield supposedly can pop out glass and cause earlir clouding....dunno...I know the screen is "cooler" in front than just having foiled bubble wrap that surprised me
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