http://www.esru.strath.ac.uk/EandE/Web_sites/12-13/Domestic_flue_gas/technical-analysis/heat-exchanger-analysis/crossflow-air-hx.html. Most likely, your design will end up being a cross-flow heat exchanger. Your best bet at finding out how well the air conditioner will work is to look at the results of someone else's prior design.As for how close you can expect to get the air temperature to the water temperature in a cross flow heat exchanger: I would estimate your maximum cooling would be less than half the difference between cold water temperature and warm air temperature ((30 degC - 20 degC)/2 5 degC). So, you could cool outside air to 25 degC at the coolest. More likely you would end up at 27 degC with a simple cross flow heat exchanger made with a fan and cooling coil of flowing water.
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.
·OTHER ANSWER:
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.
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