I live in the tropics, and during the summer it is very hot here. Today the air temp was low-mid 30C with 80% Relative Humidity.
I live close to a stream, which I'd like to use for free-cooling. Today I went out to the stream to check the temperature, and the stream was running at about 20C.
By my back of envelope calculations I can see that with a flow rate of 0.1l/s I would have about 418W/K change in the water.
My question is, how close can I expect to be able to get my indoor air temp to the outflowing water temperature? How effective is my setup likely to be if I pull in the water and run the water through as a "once through cooling" system, through a fan coil? I am missing some parameters to effectively size the system. But I do know that I want to be able to draw in the order of 1hp (750W) out of my home at 25C indoor air temperature.