Patent ID: 11891309
Assignee: ECOLAB USA INC.
Field: Measurement (Instruments)
Classification: CPC C  F  G | IPC C  F  G

Claim 4:
5. The method of claim 1, wherein determining the heat transfer efficiency for the heat exchanger comprises determining the heat transfer efficiency according to an equation:, U
  -
  Value
  :
     
  
   
    
     m
     .
    
    ⁢
    
     C
     p
    
    ⁢
    Δ
    ⁢
    
     T
     water
    
   
   
    Δ
    ⁢
    
     T
     LMTD
    
    ×
    Heat
    ⁢
       
    
     Tr
     ·
     Area
    
    ×
    
     F
     t
    
   
  
 

wherein U-Value is the heat transfer efficiency, m is the mass of the cooling water stream per unit time, Cp is the specific heat of the cooling water stream, ΔTwater is a difference between the temperature of the cooling water stream exiting the heat exchanger and the temperature of the cooling water stream entering a heat exchanger, Heat Tr. Area is an amount of surface area of the heat exchanger over which thermal energy is transferred between the process stream and the cooling water stream, Ft is a correction factor corresponding to a geometry of the heat exchange and ΔTLMTD is a log-mean temperature difference calculated using a following equation if the cooling water stream and the process stream flow in a counter-current direction:, Δ
   ⁢
   
    T
    LMTD
   
  
  =
  
   
    
     (
     
      
       T
       
        process
        ,
        in
       
      
      -
      
       t
       
        water
        ,
        out
       
      
     
     )
    
    -
    
     (
     
      
       T
       
        process
        ,
        out
       
      
      -
      
       t
       
        water
        ,
        in
       
      
     
     )
    
   
   
    
     log
     e
    
    ⁢
    
     
      
       T
       
        process
        ,
        in
       
      
      -
      
       t
       
        water
        ,
        out
       
      
     
     
      
       T
       
        process
        ,
        out
       
      
      -
      
       t
       
        water
        ,
        in
       
      
     
    
   
  
 

or calculated using a following equation if the cooling water stream and the process stream flow in a co-current direction:, Δ
   ⁢
   
    T
    LMTD
   
  
  =
  
   
    
     (
     
      
       T
       
        process
        ,
        in
       
      
      -
      
       t
       
        water
        ,
        in
       
      
     
     )
    
    -
    
     (
     
      
       T
       
        process
        ,
        out
       
      
      -
      
       t
       
        water
        ,
        out
       
      
     
     )
    
   
   
    
     log
     e
    
    ⁢
    
     
      
       T
       
        process
        ,
        in
       
      
      -
      
       t
       
        water
        ,
        in
       
      
     
     
      
       T
       
        process
        ,
        out
       
      
      -
      
       t
       
        water
        ,
        out
       
      
     
    
   
  
 

wherein TProcess,in is the temperature of the process water stream entering the heat exchanger, TProcess, out is the temperature of the process stream exiting the heat exchanger, twater,in is the temperature of the cooling water stream entering the heat exchanger, and twater, out is the temperature of the cooling water stream exiting the heat exchanger.