The specific heat capacity of water is 4.181kJ/kg DegC.A liter of pure water has a mass of 1kg at 4DegC.You have 25l of water so call it 25kg, and you want to change the temperature by upto 10DegC.You therefore need to extract (or add) 4.181kJ x 25 x 10 = 1045.25kJ of energy.Since you have 60minutes or 3600s to do this in you need to remove (or add) energy at 1,045,250/3600 J/s = 290WThis answer sounded high to me so as a sanity check I looked at electric kettles and they seem to have a capacity of about 1.7l and a wattage of about 3kW.Your spec. is for four peltiers at 60W each. It sounds like you might be a bit light on the power side they will not be 100% efficient, the environment will be heating your water as you attempt to cool it, and you will have more than the thermal mass of the water to cool.Have I got this right?
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