Frequently Asked Questions – hiTRAN.SP software

1. hiTRAN.SP Software related questions

2. hiTRAN.SP calculation related Questions

 

1. hiTRAN.SP Software related questions

Does the Software work on Linux or Mac?

Currently hiTRAN.SP does only run on Windows operation systems.

Do I need to be software administrator in order to install hiTRAN.SP ?

In Windows you need to have administrator rights.

What is included in the installation package?

During installation two Software components are installed on your computer

  • hiTRAN.SP standalone version
  • “Plug-in” for HTRI XchangerSuite and Aspentech EDR Software are installed. The “plug-in” can only be used in the case HTRI or Aspentech products are installed.

Is the program hiTRAN.SP free of charge and why?

After approval of your application by CALGAVIN Ltd, hiTRAN.SP can be downloaded free of charge from our web page.

The thermal process engineer can use the software for hiTRAN enhanced heat exchanger design.

The software is used to promote the use of hiTRAN Thermal Systems.

Why does hiTRAN.SP have a limited expiry date and what happens once the version expires?

In order to avoid users working with different versions of hiTRAN.SP, CALGAVIN Ltd will send out Software updates with the most recent code prior to Software expiration.

The software has a fixed expiry date.

What are the reasons for Software updates?

CALGAVINs R&D department and our Software development team are aiming to keep the software up to date to reflect new research findings and software developments.
Updates can be related to:

  • Update in order to fix a Software bug
  • Adaptations to new releases of Aspentech products
  • Extension of supported tube geometries

How do I know whether a more up to date version of hiTRAN.SP is available?

Updates will be announced on the CALGAVIN web page or via our Engineering Blog.

The user can also check for new updates under [help] in the standalone version of hiTRAN.SP.

When using hiTRAN.SP as a “plug-in” the update information can be found, when pressing the [hiTRAN info] button in the corresponding application.

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2. hiTRAN.SP calculation related Questions

What is the difference between hiTRAN.SP standalone and hiTRAN.SP “plug-in” calculation?

When calculating heat transfer and pressure drop with hiTRAN.SP standalone software only, inlet and outlet conditions of the exchanger are taken into account.

When using hiTRAN.SP within HTRI or Aspentech Software the calculations are done incrementally. The exchanger is subdivided into small segments for each segment the “plug-in” calculates the hiTRAN pressure drop and heat transfer.

In cases inlet and outlet conditions, e.g. viscosity, differ considerably the incremental method yield more accurate results.

Does CALGAVIN provide a thermal process guarantee for the calculated values when using the Software?

The release of this version of hiTRAN.SP and the associated DLL are the culmination of years of work which involved incorporating new heat transfer and friction factor data collected from a highly accurate test facility.  Tests were undertaken with clean recirculation fluids. In our “hiTRAN.SP software and process warranty” which is send out with the Licence file or can be requested from CALGAVIN, the terms and conditions for a thermal process warranty are outlined.

Is two phase flow supported?

Currently only exchanger designs with single phase flow conditions on the tubeside can be calculated.
hiTRAN Wire Matrix Elements are also used in two phase condensing and boiling applications. In order to calculate those scenarios, please submit your case to our thermal engineers.

Does the Software calculate U-type tube bundles?

hiTRAN.SP can calculate U-type configurations.

In general hiTRAN Matrix Elements are pulled into the tube bundle in flow direction.

In U-tube bundles they can only be pushed into the bundle, therefore in the outlet leg the inserts are installed opposite flow direction.

A specific calculation algorithm for U-tubes takes this into account. Typically the heat transfer results are slightly lower compared to the straight tube bundle.

Does the Software handle wall viscosity influences?

Experiments at our state of the art test facility were conducted in order to determine wall correction factors for hiTRAN Inserts. The experiments showed that they are different compared to the plain empty tube. They are implemented into our Software and applied when using the hiTRAN.SP stand alone version or the hiTRAN.SP “plug-in”

What are the implications when modelling fans off operation?

CALGAVIN is aware that some of our customers are modelling fans off operation by calculating performance with a reduced tube length. When using the hiTRAN.SP there is a danger that this could lead to slightly increased tubeside heat transfer values. This is because the DLL includes a modifier in the calculation which takes into the potential for a non-optimal fit due to long tube lengths. Hence even if you set the model number based on allowable dP for the full tube length if this model is then used in simulation mode for the reduced length the calculated hi may be optimistic (this depends on the actual and simulated tube lengths). In general for tube length longer than 8m this effect should be taken into account.

Please be sure to check and compare the calculated coefficients for the two lengths. Then down-rate the value for the shorter length by using an appropriate multiplier in the correct Safety Input field.

Questions reLATING to HiTRAN Thermal systems

Questions related to hiTRAN Thermal Systems can be found in our section FAQ hiTRAN