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Greenhouse heating: Flow requirements

Greenhouse heating: Flow requirements

Greenhouse heating: Flow requirements

(OP)
I have been tasked with designing a greenhouse heating system. I have at present calculated the required BTUs to maintain the desired internal temperature, but now am attempting to calculate the required fluid flow velocities to maintain this.  I am using a pipe network with a working fluid of water.  the inlet temperature is 60 degrees C.  Could anyone suggest how i would go about establishing a fluid velocity in the pipes.  i have tried simple calculations (Q = m.c.delta T) to establish an approximate mass flow rate, but this does not take into account such factors as pipe friction and heat transfer coefficients.  

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