Personal thoughts on Air Conditioning

[sledhead]

mine is on the ceiling , I use it to let steam and the nice smell of bacon out for every one outside to enjoy .

the toaster oven we use outside most of the time

dave 

[Scott & Heather]

Lol. I smell the neighbors cooking all time and it makes me hungry.  Hey niles, I spent a night googling air to air exchangers and I'm intrigue. Thank you for now giving my head something else to ponder :-/


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[niles500]

Scott, let me throw another curve ball, "air to fluid" heat exchanger, water as the working fluid, where your fresh water tank is your heat/cold sink, simply circulate the fresh water through the heat exchanger, combination swamp cooler and hydronic heat 

[belfert]

The whole point of an air to air exchanger is to heat/cool the incoming air from the outgoing air so you can have fresh air without losing all your heated/cooled air.  An air to water exchangedr doesn't meet the primary goal of bringing in fresh air or exhausting stale air.

I had one in my previous house.  They would seem to be pretty big to have in a bus.

[Jim Eh.]

Would you not want to blend the air conditioned/heated air supply with a mix of recirculate and outside fresh air to reduce moisture buildup inside the coach?

[niles500]

Sorry I wasn't real clear, I'm talking something like a geothermal system, you mount an exhaust fan at your preferred location and then a passive return vent in close proximity, when you turn on the fan a circulation pump comes on and pumps the water from the fresh water tank through a closed circuit through a small coil in the return vent returning it to the fresh water tank. The idea is the fresh water tank (depending on it's mass/volume acts as the heat sink) will maintain a temp close to the cabin's ambient temp (assuming you have heated bays in sub freezing winter weather). In a dry climate or with the heat on it would add a little moisture to the air and would be a benefit. In a humid environment it would add to the humidity and would be working against the A/C, but we're talking a real small system working for short periods of time. Hope that is clearer - FWIW

[Scott & Heather]

You can reduce moisture with a dehumidifier or a/c condenser....recirculating the interior air. Now the argument about getting fresh air...can't speak to that. In theory, if your interior air were filtered, would it not be considered fresh? Nuther question, in a perfectly hermetically sealed home or bus, wouldn't you need to add oxygen every so often?


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[sledhead]

if you have pets or a wife no added air is needed as the door is always opening and closing

dave

[luvrbus]

  All this time I thought the make up air, Ac removed by the vent hoods in the restaurants was complicated and a pain seems like a cake walk compered to a bus.

How would you guys like to deal with this 118 degrees forecast for the next 4 days here and that is a Chamber of Commerce forecast I bet it gets to 120+ degrees, great thing about being mobile in 120 miles I can be where the high will be in the 80's and lows in the 40's at night  

OT but who needs 120 degree fresh air with no humidity I'll be happy to send you some   I have a surplus    

[Scott & Heather]

Lol. Sorry cliff. I kinda feel your pain. It's been hot
Here in Texas. Today it was cool...around 95 so I took the day and made new stairs with the bus door open all day.


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[TomC]

The heat exchanger system on the return air using the water from the fresh water tank will do almost nothing for heat control. The reason chilled water A/C systems work so well is the water is down around 25 degress. Using 60 degree water will do almost nothing-don't waste your time. Good Luck, TomC

[Lin]

I'm sure that is a typo, Tom.  Chill water, I think, is generally from 35 to 45 degrees.

[kyle4501]

I'm sure that is a typo, Tom.  Chill water, I think, is generally from 35 to 45 degrees.

Yep, water at 25 F is kind of hard to circulate thru a heat exchanger . . .

[Iceni John]

I'm sure that is a typo, Tom.  Chill water, I think, is generally from 35 to 45 degrees.

At my work there is a 900,000 gallon tank of chilled water for the entire facility's A/C needs.   It's cooled to about 39 degrees at night, then during the daytime it's pumped throughout the facility to heat exchangers in each building.   When this system was installed about fourteen years ago it was calculated that it would pay for itself in seven years or less, simply by being able to chill the water at night when electricity is cheaper and when the ambient temps are lower.

I'm guessing that 25 degree "water" would be more like a coolant of some sort, not just water.

John   

[TomC]

Some chilled water systems use saline (salt) water that brings down the freezing point so you can use 25 degree water. Good Luck, TomC