www . refrigerationandaircon . co . za RACA Journal I November 2023 35
Project
We had to co-ordinate the installation around the arrival of the moulding machines while sticking to the programme required for wet trials . We adopted a phased approach so that chilled water could be supplied at the required start dates . Project phases : ȃ Piping infrastructure , including chillers and pumps ȃ Electrical switch gear and wiring ȃ Plant control system ȃ Final connections to the manufacturing equipment
1
In terms of the design specifications , the manufacturing equipment components required a supply of various temperatures and water flow rates . This was achieved by adopting a primary and secondary chilled water network , plus incorporating a plate heat exchanger to control different temperature circuits accurately .
Adopting the Trane chilled water plant management system aided in accurately controlling the various requirements throughout the production cycle .
2
TECHNICAL DETAILS The cooling system comprises of two 367 kW Trane scroll type air cooled chillers . Each chiller was supplied with their own internal primary circulating pump . The chillers operate as duty / stand-by , ensuring redundancy in the facility . A buffer tank along with a plate heat exchanger was incorporated for system volume and temperature control . Two secondary circulating pumps with VSDs were installed . Their role is to provide various flows to the moulding machines .
The only difficulty experienced on site was a lack of stable and continuous power supply . The customer overcame this issue by implementing a generator .
The system is highly efficient . Scroll chillers with multiple step control , implemented on this project , capitalise on part load efficiency during the variable load conditions during productions . Also , by adopting VSD control with a Trane plant manager , we managed to reduce in-rush current during start-up , and to mitigate peak load electrical consumption .
Superior control strategies were implemented to make the system as efficient as possible , while the chillers have been providing excellent performance and reliability .
The whole HVAC project was done in Revit , by ODA Design , mechanical consultants , and apart from 3D model , accurate piping , fittings and valves bills of quantities were produced as a final result .
This was a rare kind of project found these days – one that was implemented smoothly and on time .
ODA Design would like to thank all of the participants and the client for their contribution and commitment , which lead to the successful completion of this project .
1 and 2 : The cooling system comprises of two 367 kW Trane scroll type air cooled chillers .
Distribution piping .
“ Superior control strategies were implemented to make the system as efficient as possible , while the chillers have been providing excellent performance and reliability .”
www . refrigerationandaircon . co . za RACA Journal I November 2023 35