Heat Exchanger Metric Formulas

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Oneso
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Hello,

I need help to calculate the length of pipe in copper (d=22mm) to get the water in "kolam" to be 45 degree celsius and the heat pump temp is 55 degree celsius, heat pump water flow is about 1 meter cubic per hours, any simple formulas ?

thank you for help
 

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Google found this. Might be of help if no other answers...
http://www.gandipsbio.com/Articles/Papers/3_Helical_Coil_Heat%20Exgr_1982.pdf
 
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