1. The problem statement, all variables and given/known data Steam flows through an uninsulated pipe at 0.5 kg/s, entering at 5 bar, 440 C and exiting at 3 bar, 320 C. How much energy is lost from the steam per hour? 2. Relevant equations Which terms in the energy eqn can drop out? I'm having trouble with that. Is there only one W? 3. The attempt at a solution Starting w/ the full energy eqn: de/dt = Q - W_ + (m_i)[u_i + (p_i)(v_i) + (v_i)^2 + g*z_i] - (m_e)[u_v + (p_e)(v_) + (v_e)^2 + g*z_e] where Q = vol. flow rate W = work rate m = mass flow rate subscript e = out subscript i = in v = velocity u = specific internal energy p = pressure So z_i = z_e = 0 Q = mv = (0.5)(0.6548) = 0.3274?