Python
Air Conditioning Hot and Chilled Water Systems Design
The computer program PYTHON is a WINDOWS based program that analyses water piping systems for air conditioning applications. It provides for the analysis of hot and chilled water closed loop systems and also open loop systems such as condenser water piping systems. The program can however also handle other fluids by entry of the fluid density, viscosity and specific heat. The program handles systems with primary and secondary circuits and is based on the methods and data in the AIRAH/IHRACE Application Manual Air Conditioning Water Piping (DA16). It includes all the fittings and associated pressure loss data in this manual readily accessible through drop down lists.
The Piping Schematic
The program provides for graphical input of the piping layout in schematic form with separate layers for supply, return and plant room piping. Primary and secondry sytems with separate pumps can be modelled. The pipework system components, including boilers, chillers, head tanks, coils, condensers, etc., are all entered by selection from a floating toolbox.
Pop-up dialogue boxes allow entry of the various parameters associated with each piping system component (pipe material, coil loads, number of fittings, elevations, etc.) and master defaults such as coil connections and fittings are provided to minimise data input. Nodes are automatically inserted and numbered as the piping system is developed.
The calculations are carried out in a series of spread sheets. In the first of these the pressure losses throughout the system and the pressure at each node is calculated using the Colebrook White formula.
Pop up Dialogue Boxes for Coil, Chiller and Pump for entry of Data
The Pressure Loss Spreadsheet
The Heat Loss Spreadsheet
In a second spreadsheet the heat loss or gain from all the pipes in the system are calculated, adjusting coil water flows to account for the heat loss/gain along the pipes to each coil. In chilled water systems a check is made for the possibility of condensation formation.
In a third spreadsheet, each coil circuit is analysed and a control valve selection made based on the required valve authority. Two and Three way control valve can be modelled. The out-of-balance pressure loss required to be taken up by balancing valves is also calculated along with the required flow and head for each pump.
The cost of the piping system in terms of material quantities and fabrication and erection man-hours is also determined for all pipes, fittings, insulation and pipe system components.
The Control Valve Selection Spreadsheet
The program also determines the total lengths of pipes by material type and size and the number of fittings by type and size in a Cost Estimating Spreaedsheet. The pressure and temperature at each node is also displayed in another Screen and a summary of all the results is included in a Summary Results Form. Specific columns from each spreadsheet can be selected for printing.
The Summary Results Screen
The program can also analyse open circuit systems such as condenser circuits with cooling towers, condensers etc.
Open Circuit System with Two Cooling Towers and a Condenser
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
