Remerciez-le!

Remerciez @Admin pour avoir partagé cet document gratuitement, de la manière la plus simple, en partageant sur les réseaux sociaux.

Hx sizing guide A Selection Guide for DTL Series Heat Exchangers This is your guide to sizing and selecting DTL series heat exchangers We recommend that you read this page completely before continuing to the step- by-step procedure on the following pages

A Selection Guide for DTL Series Heat Exchangers This is your guide to sizing and selecting DTL series heat exchangers We recommend that you read this page completely before continuing to the step- by-step procedure on the following pages The graphs in this guide present data for speci ?c ranges of the given parameters Operating the heat exchanger above or below these ranges is not recommended All charts related to thermal parameters Steps through are for counter ow operation of the heat exchanger Parallel ow will result in a signi ?cant reduction in thermal performance and is not recommended A worksheet is attached to this guide Maintain this sheet as an original Always work on a photocopy Thermo Dynamics Ltd Frazee Avenue Dartmouth N o vaThSocorntihaill Drive Canada DBa rBtm- oZu th Nova Scotia Tel C an- a d a B B R Fax - T H ER MO D YN A M IC S LswTowDlawr inthfeor mFTtoahe-exdl r ymn o a -m d yi cn s a cm o im c s-- c o m TIPS FOR USING THIS GUIDE ? Always specify counter ow operation for maximum performance ? The heat exchanger can be mounted vertically if required however this may require special mounting brackets ? If the sizing procedure suggests a nonstandard length heat exchanger use the next larger size or consider using two shorter heat exchangers ? Never rely on the copper ports to support the heat exchanger ? Consider using two or more heat exchangers when a the Heat Transfer Load Q is greater than MBtu h b space for locating the heat exchanger is limited or c temperature and ow parameters are outside the recommended range for a single heat exchanger Standard engineering symbols and subscripts have been used throughout this guide and are listed below Units are displayed with each graph along with a table for conversion Symbols A Heat Exchanger A rea F Flow Head loss H Modifying Factor L Heat Exchanger Length LMTD Log Mean Temperature Di ?erence M Fluid Volume Flow Rate P Pumping Power Q Heat Transfer Load U Overall Heat Transfer Coe ?cient Subscripts i Inlet Condition o Outlet Condition s Shell Side t Tube Side The heat exchanger illustrated is comprised of two DTL series heat exchangers The shell side ow is divided between the two heat exchangers The full ow passes through the tube side of each heat exchanger This plumbing arrangement is typical for oil- ?red boilers that is where a relatively large temperature rise is required for the tube side uid potable water and a relatively small temperature drop is required for the shell side ow A QUICKPICK table for heat exchanger selection is available from Thermo Dynamics for selecting these heat exchangers For special applications not covered by this guide contact Thermo Dynamics Ltd for assistance Ts i Tt i Heat Exchanger Tt o Heat Exchanger Ts o The DTL series heat exchanger is also capable of operating with natural circulation on the