Dolphin

Duct and Fitting Pressure Loss Calculation

The computer program DOLPHIN calculates the pressure loss of a series of ducts and fittings enabling a user to determine the required fan pressure for a duct network. The user enters the ducts starting from the fan and working down towards a selected terminal. For each duct entered the fittings are selected and the program then calculates the pressure loss in each length of duct and each fitting. Supply ducts and fittings are entered on one screen and return ducts are entered on a second screen. The program can also size selected ducts using an entered Pressure drop/ meter.

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Features

The computer program DOLPHIN calculates the pressure loss of a series of ducts and fittings enabling a user to determine the required fan pressure for a duct network. The user enters the ducts starting from the fan and working down towards a selected terminal. For each duct entered the fittings are selected and the program then calculates the pressure loss in each length of duct and each fitting. Supply ducts and fittings are entered on one screen and return ducts are entered on a second screen. The program can also size selected ducts using an entered Pressure drop/ meter.

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The Fitting Selection Form for Supply Ducts

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Typical Summary Results

Results

The Summary results include the total pressure loss of the supply and return ducts and fittings, and the Air Handling Unit pressure losses can be entered to give the total system (fan) pressure loss. The maximum velocity in the supply and return ducts is also displayed. The Supply and Return screens can be exported to the Microsoft Excel Spreadsheet program for graphing or printing.

Technical Details

  • The program performs an hourly cooling load analysis taking account of thermal storage, on a design day in each month of the year. It also determines the heating load for each AHU.
  • Specific monthly 3 pm design dry and wet bulb temperatures are available in the program for over 600 locations in Australia and for many offshore locations.
  • The program carries out a psychrometric analysis for each AHU with the coil performance expressed as a by pass factor, leaving coil temperature or nominated air quantity including fixed by pass and dump back systems.
  • Fresh air quantities can be entered at room or zone level as l/s/person with the “plant” fresh air quantity then determined using the Compartment formula from AS1668-1991 for multiple rooms/zones.
  • Additional data for light weight roofs (down to 10 kg/m2) has been incorporated. This allows the program to analyse buildings with light weight metal deck or similar roofing.
  • Precalculated U values and surface densities for a wide range of “standard” wall and roof constructions are available in the program.
  • Walls orientations can be at any azimuth and the entire building can be readily rotated.
  • The results viewing and printing screen provides for selection of various tables, load charts, summaries, etc, in either viewing or printing mode. The selected output can then be passed to a print file for review before final printing. Different fonts for headings, sub headings, etc are provided for under the control of the user. Templates enable print selections to be retained between runs.

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The user interface for HYENA+ is much cleaner and more user friendly than the UI used for the original HYENA program. This makes the experience more enjoyable, easy, and less taxing when using the program for long periods of time. HYENA is an excellent tool to have and its now web-based nature with HYENA+ has allowed it to become even more beneficial.

– M. Cummings

It has always been a pleasure dealing with ACADS-BSG team due to their helpful nature and quick response time to any inquiries and technical issues. Camel\Hyena works out of the box and install time is in seconds, I cannot recommend any other company that provides better customer service other than Catherine and her team.

– Marvin D

Catherine and the team at ACADS provide customer service of the highest standards always offering the best solutions for our business with fast response times. I would highly recommend ACADS-BSG.

– Amy

The ACADS BSG suite of software has been used by VOS Group for 30 years. We as a company have grown as the software capabilities have changed with usability and technology. The support from head office has always been quick and accurate, with a resolve to overcome any obstacles. We have always found the outputs to be accurate and reliable and a good basis for good engineering design.

– Shayne C

Moving to a cloud based platform has improved the overall performance of the software. [being able to log in from any device] has improved my overall productivity as I only need to carry my smart phone or a tablet, and I can do my job remotely. Tools and functions are clearly organised within the new interface reducing any confusion for a new user. Copy+ Paste option saves a lot of time for Engineers like me. It just works like an Excel Sheet, where you can copy items and paste them somewhere else. It saves a lot of time especially if you are working on a single project and you want to do multiple calculations.

[HYENA+] allows me to quickly switch from one calculation to another without losing any data. This has reduced the overall lead time in doing calculations. I am sure [HYENA+] will have a positive impact on the Fire Industry.

– Ahkil M