Oho, yeh conduction, convection, radiation te heat exchanger di gallan taan mein roz lab 'ch dekhan! Conduction taan jaande ne lohi di rod 'ch, convection boiler 'ch paani garam honda dekhda aan, te radiation… saade kol tan koi furnace nahi. Heat exchanger design vi kiti sohni hundi hai, par saade purane instruments 'ch sirf ek simple shell and tube hi hai. Asli kam taan eh hai ke mein har hafte diesel di kimat vakhri kardan, te fer inn machines di seal te gasket check karan — kyuki budget nahi hai te kujh vi garm hoya, garibi di conduction te sab 'ch ho jandi hai.
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