Grafton Hospital - Central Chiller Upgrade
EPES were engaged by NNSWLHD to investigate performance issues with existing chillers and prepare contract design documentation for the upgrade of central chilled water system. Central chilled water systems serving critical care areas such as operating theatres, sterile store and reprocessing areas.
Our role in the works was from initial investigations, concept development through to detailed engineering design, tendering assistance, construction supervision and thorough witness testing during commissioning.
Scope included mechanical, electrical and BMS.
Location: Grafton, New South Wales, Australia
Client: Northern NSW Local Health District (NNSWLHD)
Engagement: Design Consultant
Sectors: Buildings, Hospitals and Healthcare
Services: Building Services, Commissioning Assistance, Construction and Design Consulting, Independent Reviews and Audits
As hospitals are refurbished and extended to, there is a tendency for the hydraulics of the chilled water system to vary from the original design. This is particularly important when modern technology and design thinking is introduced into legacy systems.
Differences in thinking around variable flow versus constant flow, system configurations (primary versus primary/secondary) necessitate critical thinking and taking the time to understand the original design intent and how new design thinking will influence performance and reliability. Modern equipment is much more sensitive to changes in flow and temperature.
The main challenges in this project was to understand the legacy system and the changes that have been introduced since it was initially commissioned.
Analysis and Implementation
EPES spent considerable time in the investigation stages to gain a thorough understanding of the following:
EPES also liaised extensively with various stakeholders including clinical staff, project managers and Contractors involved in the original works as well BMS controls technicians and site-based maintenance engineers.
Once the various pieces of the puzzle had been determined, a contract design was prepared which included replacement of a legacy chiller, modifications to chilled water piping and reprogramming of BMS controls functions.
The resulting chilled water system has provided the hospital with reliable chilled water production and reticulation throughout the field. Controls functions have been rigorously tested, including staging and failure controls functions to ensure that critical areas are always provided with cooling and dehumidification.
Integrating new technologies into legacy systems must be subjected to a high degree of diligence and investigation to ensure compatibility. Taking the time to understand the root cause of performance problems enables long term reliable solutions to be identified economically and with minimised disruption to availability.
> Asset Management
> Building Services
> Commissioning Assistance
> Construction and Design Consulting
> Digital Engineering
> Independent Reviews and Audits
> Infrastructure Engineering
> Petroleum (Midstream) Engineering
> Piping Engineering
> Power Plant Engineering
> Product Development
> Project Management
> Specialist Analysis
> Water and Waste Water