PROCEDURE

Note : Truncate the final calculated value to 2 digits after the decimal point in all calculations

I. Boiler calculations

• Find the enthalpy of steam h_g (kJ/kg) at the given temperature. Click on 'Refer' to refer the value and submit your answer
• Similarly, find the Enthalpy of feed water h_f (kJ/kg) and submit your answer
• Select Mass flow rate for steam m_steam (kg/hr) and submit your answer
• Calculate energy required for feedwater to reach boiler at given temperature at startup phase of boiler Q(W), use the below formula for calculation and submit your answer
  Q = M_steam × C_pwater × ΔT
• Calculate time required t (min) using below formula and submit your answer
  t = Q / Q_electric
• Click on 'Next' and proceed to the next level

II. Heat exchanger water side calculations

• Calculate flow rate of water (m³/s) using the below formula and submit your answer
  flow_water = m_water/(3600 × ρ_water)
• Calculate area of inner pipe A_water using the below formula and submit your answer
  Area = π × r₁², where π = 3.14
• Calculate speed of water V_water using the below formula and submit your answer
  V_water = flow_water/A_water
• Calculate Reynold's number for water (Re_water) using the below formula and submit your answer
  Re_water = (V_water × r₁ × 2 × ρ_water) / μ_water
• Calculate Prandtl number for water (Pr_water) using the below formula and submit your answer
  Pr_water = ( μ_water × C_pwater) / k_water
• Calculate Nusselt number for water (Nu_water for heating) Nu_water using the below formula and submit your answer
  N_uwater = 0.023 ( Re_water^0.8 Pr_water^0.4)
• Calculate heat transfer coefficient of water (h_i) using below formula and submit your answer
  h_i = (Nu_water × k_water) / 2 r₁
• Click on 'Next' and proceed to the next level

III. Heat exchanger steam side calculations

• Find h_fg (J) at steam from steam table at the given temperature. Click on 'Refer' to refer the value and submit your answer

• Calculate heat transfer coefficient of steam for pure condensation h_o (W/m².^oC) using the below formula and submit your answer
  

  

• Calculate Overall heat transfer coefficient U_o (W/m².^oC) using the below formula and submit your answer
  

  

• Calculate Log mean temperature difference ΔT_LM (^oC) using the below formula and submit your answer
  

  

• Calculate Surface area of inner tube SA (m³) using the below formula and submit your answer
  SA = π × 2 × r₁ × l

• Calculate maximum heat exchanges heat transfer Q_hx using the below formula and submit your answer
  Q_hx = U_o × SA × ΔT_LM

• Click on 'Next' and proceed to the next level

IV. Outlet temperature of water calculations

• Calculate Maximum possible heat from steam given Q_steam using the below formula and submit your answer
  Q_steam = (m_steam × h_fg) + (m_steam × C_pwater × (T_steam - T_condensate))

• Calculate Actual Energy transfer Q_Actual using the below formula and submit your answer
  Q_Actual = min (Q_hx , Q_steam)

• Calculate Temperature of outlet water T_out using the below formula and submit your answer
  

  

• Select the appropriate to get T_out to 60 ^oC and submit your answer

• Click on 'Result' for performance accessment