Alcatel Submarine Networks
Comunications
Temporary HVAC ventilation close control
330kw cooling 120kw electric heating
Ventilation hire and cleanroom cooling for Alcatel Submarine Networks. In one of our most challenging projects, we helped them to maintain their operations whilst a major AHU replacement programme was completed.
This ventilation hire and cleanroom cooling project was one of our most challenging projects to date. Albeit, not in terms of scale, but more from a controls point of view.
Whilst the clients HVAC plant was undergoing a replacement programme, full operation of the clean rooms effected was required. Three air handling systems, serving three clean rooms were due to be replaced.
With tight temperature and humidity bands of plus/minus 2 degrees and 20% RH, this project required very careful consideration and realisation. Even then, much follow-up commissioning was required to achieve what would turn out to be a great result.
With the aforementioned in mind a detailed site survey was made and a proposal for ventilation hire and cleanroom cooling put forward.
This proposal included, 3x ACR 160.120 AHU’s, 3x CH150 packaged water chillers and all associated equipment, including all air ducting and chilled water hosing.
For this project we used 500mm flexible Spiroflex ducting to connect between the temporary AHU’s and the customers ducting spigots. Catenary cable was used for support. Overall this was an ideal system that could be tailored to the changing conditions in the plant room.
All the external equipment was positioned using a hiab lorry. Due to limited space multiple lifts were required involving re-positioning of the lorry. A big thanks as always to the guys at David Stanley Transport for their unswerving support.
Once Positioned, the AHU’s were fitted with 500mm supply and suction ductwork. The chillers were connected with 2″ rubber suction/ discharge pipe-work, with each AHU being served by one packaged chiller. The chillers used here have a capacity of 110kw cooling, and incorporating tanks and pumps, are neat and easy to install.
The 500mm ductwork systems were installed/ supported in the plant room using a catenary wire system. The final connection was made to the clients plant during short change over periods, when the fixed plant was shut down and the temporary connected and started.
Requiring some serious lateral thinking and revisits to the design, commissioning was very involved.
Initially, temperature control was facilitated by the AHU’s on-board controllers using sensors placed in the rooms. However, as a result of the clients monitoring systems, including multiple averaging sensors, there was a disconnect between the systems ie. our control temperature sensor was not reading the same as their averaged, consequently taking the room out of specification and stopping work. As a result, a full controls review was undertaken and a course of action decided upon.
Outputs from the clients existing controls systems were used to drive additionally control valves for the chilled water supply. As such, temperature monitoring and control was centralised in one place ensuring accurate space temperatures within spec.
After some initial controls issues the space temperature control achieved with the temporary AHU’s was exceptional. Re-evaluating the control strategy, coupled with modifiable systems, was significant to achieving this.
All things considered, disruption to the clients operations was minimal, with normal operation maintained. The ventilation hire and cleanroom cooling remained in place for a total of 6 months whilst the clients AHU’s were replaced.
Please contact us here if you require any advice or assistance with your project.
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