What is the heat transfer coefficient between steel and water?

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The discussion focuses on determining the heat transfer coefficient between steel and water for a thermal absorbing system integrated with photovoltaic panels. The user seeks to understand if adding a steel backing to the panels will effectively transfer heat to the water, which is crucial for optimizing energy output. A suggested approach involves using a 1-D conduction scenario, with a tabulated heat transfer coefficient for plain carbon steel at 300 K being approximately 60.5 W/m*K. The conversation also highlights the importance of considering factors like temperature variations and the flow of water in the system. Overall, accurate calculations are essential for assessing the potential heat transfer efficiency in the proposed setup.
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I want to attach a photovoltaic panel on top of a thermal absorbing system. My idea was to to replace or add a steel backing to the photovoltaic panel. The thermal system would consist of a box filled with water, which would be in direct contact with the panel. But before I begin my idea I need to know whether it would work. I need to know the heat transfer coefficient between steel and water so that I can find out whether the photovoltaic panel would be able to provide enough heat. But I don't know where to get the heat transfer value. I was thinking about using the formula q= h*A*deltaT but I figured this would leave me with two unknowns. I searched around for a value for the heat transfer coefficient between steel and water but no website gave me a value. Could someone please tell me a value or a correct formula. Thanks for the help.
 
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Are you talking about solar heat? There are charts on how much energy transfer you can get for the the conditions (cloudy or clear), time of year, time of day, and location of your system.

Not sure if this is what you are talking about.
 
Since the water is not flowing, try using a simple 1-D conduction scenario (plane wall). You would then only need the heat transfer coefficient of the steel plate. Of course this value will change with temperature and so will the overall heat transfer rate. Your water and whatever is on top of the steel plate will dictate the delta T across the plate. Then it's just q=((k*a)/L)*dT

At 300 K, plain carbon steel has a tabulated value of 60.5 W/m*K .

The only caveat with this is that this assumes no heat generation and steady state conditions. I would think it would get you in the ballpark though.
 
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