Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

IHEA Robina Hospital Chiller Plant Optimisation

1,053 views

Published on

Robina Hospital is the 6th largest hospital in Queensland with 364-beds and a suite of inpatient and outpatient services.

Published in: Health & Medicine
  • Be the first to comment

IHEA Robina Hospital Chiller Plant Optimisation

  1. 1. Robina Hospital Chiller Plant Optimisation September 2015
  2. 2. 11-09-2015Page 2 • Facility Overview • Project Motivations • Evaluation & Assessment • Optimisation Process • Results Robina Hospital Chiller Plant Optimisation Table of Contents Kieran McLean Business Development Siemens Ltd.
  3. 3. 11-09-2015Page 3 Robina Hospital Chiller Plant Optimisation Facility Overview Robina Hospital is the 6th largest hospital in Queensland with 364-beds and a suite of inpatient and outpatient services. The facility has undergone constant expansion over the past 15 years: • 2000 – Constructed as a private hospital offering some public services • 2002 – Acquired by QLD Government • 2007 – Stage 1 expansion adding 25 beds • 2012 – Stage 2 & 3 expansions doubling number of beds ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results
  4. 4. 11-09-2015Page 4 Robina Hospital Chiller Plant Optimisation Chilled Water System – 2007 ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results AX Building Chiller Plant 1x Air-Cooled Chiller Original Central Chiller Plant 3x Reciprocating Water Cooled Chillers (768kWr)
  5. 5. 11-09-2015Page 5 Robina Hospital Chiller Plant Optimisation Chilled Water System – 2012 ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results AX Building Chiller Plant 1x Air-Cooled Chiller Original Central Chiller Plant 3x Reciprocating Water Cooled Chillers (768kWr) Link between Chiller Plants New Central Chiller Plant 3x Centrifugal Water Cooled Chillers (2500kWr)
  6. 6. 11-09-2015Page 6 Robina Hospital Chiller Plant Optimisation Chilled Water System – 2012 Facility Served by 3x Chiller Plants operating in the following modes: • Low Load – 2x older plants serve entire facility • Normal – new plant serves entire facility • Independent – all 3 plants operate independently of each other ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results
  7. 7. 11-09-2015Page 7 Robina Hospital Chiller Plant Optimisation Chilled Water System – 2012 Control Strategies • Constant Volume Primary Pumps • Constant Volume Condenser Water Pumps • Variable Volume Secondary Pumps with Pressure Reset ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results
  8. 8. 11-09-2015Page 8 Robina Hospital Chiller Plant Optimisation Project Motivations 1. Simplification of Chilled Water System Operation 2. Improve facility energy efficiency 3. Reduce maintenance requirements of 3x Chiller Plants 4. Improve Humidification Control of Operating Theatres ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results
  9. 9. 11-09-2015Page 9 Robina Hospital Chiller Plant Optimisation Evaluation and Assessment •Two projects were initially being considered: 1. Mechanical upgrade to improve Dehumidification 2. Energy Optimisation Project focusing on Chiller Plant •Demand Flow™ provided possibility of addressing both issues •Robina Hospital engaged Siemens to complete a detailed feasibility study to further understand chilled water network and benefits of Demand Flow™ ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results
  10. 10. 11-09-2015Page 10 Robina Hospital Chiller Plant Optimisation Evaluation and Assessment – Chilled Water Sub-Systems The five major energy consuming sub-systems of the Chilled Water network are: 1. Chillers 2. Chilled Water Pumps 3. Condenser Water Pumps 4. Cooling Tower Fans 5. Air Handing Units ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results Demand Flow optimises the performance of all energy consuming sub-systems holistically.
  11. 11. 11-09-2015Page 11 Robina Hospital Chiller Plant Optimisation Evaluation and Assessment – Challenges •15 years of modifications to the chilled water network • Identifying all system bypass water • Water quality issues from old plant being transferred into new ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results
  12. 12. 11-09-2015Page 12 Robina Hospital Chiller Plant Optimisation Evaluation and Assessment – Findings • 22% reduction in chilled water plant consumption • 3.3 year payback period guaranteed (energy savings only) • 22% Internal Rate of Return • Redundancy of 2 inefficient chiller plants • Improvements in humidification control possible • No Chiller Variable Speed Drives required • Significant water quality improvements ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results
  13. 13. 11-09-2015Page 13 Robina Hospital Chiller Plant Optimisation Optimisation Process • 3 month project implementation period (July – September) • Installation of: • Variable Speed Drives for Condenser Water Pumps • Cooling Tower Isolation Valves • High accuracy differential pressure and temperature sensors • Commissioning of: • Demand Flow control algorithm • 12 months system fine tuning • Continuous supply of chilled water critical for operating theatres and MRI ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results
  14. 14. 11-09-2015Page 14 Robina Hospital Chiller Plant Optimisation Optimisation Process – Demand Flow™ Commissioning Chillers Optimised pressure and temperature setpoints. Increased operating times at chiller ‘sweet-spot’. Pumps Variable speed control of all chilled water and condenser water pumps. Removes system bypasses to reduce excessive pumping energy. Cooling Towers Optimised cooling tower flow, variable speed fan control and staging.
  15. 15. 11-09-2015Page 15 Robina Hospital Chiller Plant Optimisation Results – More than Energy Savings! • Plant Consolidation • Facility Reliability Improvements • Chilled Water System Efficiency • Energy Savings & Greenhouse Gas Emission Reduction ► Facility Overview ► Project Motivations ► Evaluation & Assessment ► Optimisation Process ► Results
  16. 16. 11-09-2015Page 16 Robina Hospital Chiller Plant Optimisation Results – Plant Consolidation • Single Chilled Water Plant Benefits: • Water Savings – no longer required cooling towers for reciprocating plant • Maintenance Savings – other 2 plants no longer require maintenance • More efficient low load performance • Simplified system operation
  17. 17. 11-09-2015Page 17 Robina Hospital Chiller Plant Optimisation Results – Facility Improvements • Improved humidification control of operating theatres • Increase in deliverable plant capacity • Effective management of chiller lift • Eliminates refrigerant flow issues at low load conditions
  18. 18. 11-09-2015Page 18 Robina Hospital Chiller Plant Optimisation Results – System Efficiency Improvement Source: "All Variable Speed Chiller Plants", ASHRAE Journal, September 2001 0.5 7.0 0.6 5.9 0.7 5.0 0.8 4.4 0.9 3.9 1.0 3.51 1.1 3.2 1.2 2.9 1.3 2.7 Standard Code Based Chiller Plants New Technology, All-Available Speed Chiller Plants High-Efficiency, Optimized Chiller Plants Older Chiller Plants Chiller Plants with Repairable Design or Operational Problems Excellent Good Fair Needs Improvement Pre-Optimization (Annual Average 0.93 kW/Ton) (Annual Average System COP 3.8) Post-Optimization (Annual Average 0.66 kW/Ton) (Annual Average System COP 5.3) kW/ton * COP * (Annual Average) * Includes Chiller, Pumps and CT Fans Combined
  19. 19. 11-09-2015Page 19 Robina Hospital Chiller Plant Optimisation Results – First 8 Months of Savings • 26% Saving in Chiller Plant Consumption • 676,216 kWh saved (85% of annual target) • Reduction of 554 Tonnes of CO2 emissions • Anticipated payback of 2.5 – 3 years ahead of a 3.3 year guarantee
  20. 20. 11-09-2015Page 20 Demand Flow™ Case Study – Robina Hospital - 100,000 200,000 300,000 400,000 500,000 600,000 700,000 800,000 900,000 Nov-14 Dec-14 Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Cumulative Target vs. Actual Savings (kWh) Cumulative Target Cumulative Actual Annual Target
  21. 21. 11-09-2015Page 21 Kieran McLean Demand Flow – Business Development Maree McKay Service Director – Robina Hospital Any Questions? Robina Hospital Chiller Plant Optimisation Contact page

×