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Plate Heat Exchangers: Preliminary Design

Nov 08 2010 12:50 PM | Chris Haslego in Heat Transfer ***** Share this topic:
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Design Charts for Plate and Frame Heat Exchangers

Often, in compact heat transfer technology, engineers find themselves at the mercy of the manufacturers of the equipment. For example, limited literature correlations are available to help in the preliminary design of plate and frame heat exchangers. We will introduce a series of charts that can be used for performing preliminary sizing of plate and frame exchangers. After introducing the charts, we will follow with examples to help clarify the use of the charts. The following should be noted regarding the use of the charts:

  1. These charts are valid for single pass units with 0.50 mm thick plates. The accuracy of the charts will not be compromised for most materials of construction.
  2. Wetted material thermal conductivity is taken as 8.67 Btu/h ft °F (value for SS)
  3. Heat transfer correlations are valid for single phase, liquid-liquid designs
  4. The following physical properties were used for the basis:
    Table 2: Physical Property Data Used for Chart Construction
    Hydrocarbon-
    Based Fluids
    Water-
    Based Fluids
    Thermal Conductivity
    (Btu/h ft2 °F)
    0.060.33
    Density (lb/ft3)5562
    Heat Capacity
    (Btu/lb °F)
    0.850.85
  5. Degree of accuracy should be within ± 15% of the service value for the overall heat transfer coefficient, assuming a nominal 10% excess heat transfer area.
  6. For fluids with viscosities between 100 and 500 cP, used the 100 cP line of the graphs. For fluids in excess of 500 cP, consult with manufacturers.

Download these design charts in MS Excel format from our File Repository.

plate_frame_heat_exchangers3 plate_frame_heat_exchangers5 plate_frame_heat_exchangers7
Figure 2: Heat Transfer
Data for 0.25 < NTU < 2.0
for Plate and Frame
Heat Exchangers,
Water Based Properties
Figure 3: Heat Transfer
Data for 2.0 < NTU < 4.0
for Plate and Frame
Heat Exchangers,
Water Based Properties
Figure 4: Heat Transfer
Data for 4.0 < NTU < 5.0
for Plate and Frame
Heat Exchangers,
Water Based Properties
plate_frame_heat_exchangers4 plate_frame_heat_exchangers6 plate_frame_heat_exchangers8
Figure 5: Heat Transfer
Data for 0.25 < NTU < 2.0
for Plate and Frame
Heat Exchangers,
Hydrocarbon Based Properties
Figure 6: Heat Transfer
Data for 2.0 < NTU < 4.0
for Plate and Frame
Heat Exchangers,
Hydrocarbon Based Properties
Figure 7: Heat Transfer
Data for 4.0 < NTU < 5.0
for Plate and Frame
Heat Exchangers,
Hydrocarbon Based Properties




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5 Comments

amazing article this is.thanku sir.
my only query is that graphs given here ,can they be used for bloc welded plate heat exchanger designing ?.
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Mark Farrell
Dec 12 2012 05:31 AM
Very useful. Many thanks
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ashikha717@
Jan 31 2013 11:17 PM

Sir,

Very nice article and very helpful.

But my query is that how these graph comes can you

sir please provide some baics about these.

 

Thanks

Ashish

Hindalco

Photo
Chris Haslego
Feb 12 2013 08:32 AM

These are generalized correlations that I put together when I worked for Alfa Laval.  They are appropriate for early phase design.

These are generalized correlations that I put together when I worked for Alfa Laval.  They are appropriate for early phase design.

Dear Sir,

My NTUcold is calculated to be 0.09 based on temperature difference of 4 C (37-33)C and LMTD of 40.86C. For this NTU there does not seem to be a graph.

The cooling water temperature limits are fixed here based on cooling tower's profile.