Greetings!

I have to model a room with a fishpond (more like close to a several

fountains where fishes will be inside). WxLxH=9x13x2.5 in meters.

Has anybody modeled something like that?

So, what I need to know is about ventilation rates for a room like that,

wich contains water and fishes swimming in it, but my worry is about

condensations, so if anybody has some paper or standard, please let me know.

Thanks in advance...

--

Cristian Jara Toro

Sorry, but I meant "design" instead of "model"... because I don?t think to

model a room with water in it be possible...

Here there is 2 files attached...

Cristian,

You can model it but you will need to calculate the latent and sensible loads yourself, at least if you are using eQUEST. Without having experience with fishponds, I would approach it like a natatorium (indoor swimming pool) and use the ASHRAE Handbook - HVAC Applications Chapter 5 for design guidance and loads calculations. Also, see this article: http://hpac.com/humidification-dehumidification/simplified-calculating-evaporation-1011/ for alternate method of calculating evaporation loads. Based on your drawings, I would also research state-of-the-art for aquaculture facilities, as that looks to be what you are designing.

Regards,

Bill

[cid:image001.png at 01CD291E.89167340]

Bill beat me to it. Your ventilation load would be calculated as if it were

a natatorium using total surface area, temperature and evaporative rates.

Then once you get that information you can model the ventilation rates and

make-up.

Aegis Inc Logo-OL

Mike Hupel, B.Tech, CEM, LEED-AP

We had a recent project with exterior fish ponds looking at their effect on microclimate. Any experience w/ this condition?

Arpan

Thanks to all for your quick answers!

I think I will go for calculate the heating and sensible loads, and look

at ashrae handbook for references, then, of course, I?ll try to find some

information about state-of-art in aquaculture facilities.

I thought to calculate ventilation loads using as reference a natatorium

surface, but I`m unable to recognize the quantities of fish, or density

(fishes/m3).

It`s supossed to be an "quarantine fishpond" (salmons), but I don?t have

too much information about it. I will ask for more detailed information and

I will back here.

Thanks!

Folks,

A side issue on the same topic.

I have gone through some literature on this topic. All the calculation

methods that I found are actually methods to calculate evaporation rate

from the pool with the ultimate goal to calculate (a) the heating load

to maintain the water temperature and (b) the latent load for the air

above the water. The underlying assumption used in all methods is that

all the evaporation heat is taken from the water (and nothing from the air).

I investigated this matter because I want to quantify the cooling effect

of an indoor pool to a naturally ventilated room. If I used the

calculation methods from the literature that I found (including Shah

method below) what I end up with is a latent load and a sensible load

(both positive into the zone) that will be added to the room, simply

because the method assumes that all the evaporation heat comes from the

water (and nothing from the air).

I found this very hard to swallow because we all know for a fact that

people in hot climate use pools to cool down the indoor temperature. I

am not talking about fountain or sprayer, which has a totally different

cooling mechanism where all of the evaporation heat comes from the air.

I am talking about pools, either indoor pool or pools surrounding the

building.

Is there any literature out there on the cooling effect of pools?

Thanks,

Ery

It depends on the temperature and RH in the room and the pool temp. If the

pool temp is higher than the room temp, it will always evaporate water into

the air, regardless of RH. If the air temp is higher than the pool temp,

then at a certain temp and RH water will condense from the air into the

pool. The dryer the air, the warmer the room temp will need to be before

that happens. At 100% RH it will occur as soon as the air temp exceeds the

room temp.

Mike

Michael Wilson, P.Eng., Enerficiency Consulting