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  • Heat exchanger contractual point meaning

    Discussion in 'The main mechanical design forum' started by maxch84, Dec 3, 2021.

    1. maxch84

      maxch84 New Member

      Dec 2021
      Likes Received:
      Hello everyone,

      I am new on this forum, so I hope this topic does not already exist.

      1) First, I would have confirmation that the sizing point of a heat exchanger is the operating point (let's say the triplet : Power to be evacuated P, T_Cold_Inlet and T_Hot_Outlet) that maximises the required heat transfer coefficient (KS_required in W/K).

      2) Then, I would have confirmation (that correctly specified :)) contractual point of a heat exchanger must be the sizing point.

      3) This is my main issue. I feel that the common practice is to specify to the supplier only one point (= the contractual point). Does this practice ensure that if we deviate from this contractual point (P_CP, T_Cold_Inlet_CP, T_Hot_Outlet_CP), we will still have KS_fouled_supplier(P_new, T_Cold_Inlet_new, T_Hot_Outlet_new)> KS_required(P_new, T_Cold_Inlet_new, T_Hot_Outlet_new) ? Even if KS_required(P_new, T_Cold_Inlet_new, T_Hot_Outlet_new) < KS_required(P_CP, T_Cold_Inlet_CP, T_Hot_Outlet_CP), maybe KS_fouled_supplier(P_new, T_Cold_Inlet_new, T_Hot_Outlet_new) will stall, I do not know the behaviour of the supplier function KS_fouled_supplier(P, T_Cold_Inlet, T_Hot_Outlet) which depends on the supplier heat exchanger design. Indeed, can you confirm that one point specification is sufficient in order to ensure correct sizing anywhere else (same question as for centrifugal pump specification, even if even more complex I guess).

      4) Does the supplier ensure that its KS_fouled_supplier(P, T_Cold_Inlet, T_Hot_Outlet) > (KS_required(P_CP, T_Cold_Inlet_CP, T_Hot_Outlet_CP) - [X %]) ? Is there such a common criterion used by all heat exchangers manufacturers ?

      Thank you for your help.

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