Client

Echuca Regional Health for Echuca Hospital

Customer Segment

Industry

Project Snapshot

Project Description

The new cooling system includes a Broad 500kW cool absorption chiller that is supplied with hot water (95°C) to produce chilled water at 6°C. An absorption chiller uses an evaporation cycle to cool water that is then circulated though an air conditioning system to cool the ducted air supply. The heat used to drive the evaporation process comes from the water heated by solar collector tubes and natural gas. There is a large array of over 1600 evacuated tubes mounted on the roof of the hospital’s engineering and maintenance building.

The installation includes extensive monitoring and control technology to optimise the use of solar energy and maximize cost savings.

Background

Echuca is situated on the Murray River in northern Victoria – an excellent location to capture solar radiation. Echuca Regional Health manages the Echuca Hospital and in 2010 decided to look at a range of options to replace existing electric air conditioning chillers that had reached the end of their useful service life.

The hospital looked at technologies that would both reduce energy costs and save greenhouse gas emissions and chose a heat driven absorption chiller utilising hot water heated by natural gas and solar energy.

Project Development

The feasibility stage was carried out in several main steps:\r\n

 

    • Thermal load profiles of buildings were logged and analysed.

 

    • Load profiles were compared to the heat output of different solar collector models including at flat plate and evacuated tube collectors of different brands.

 

    • Heat table energy outputs were used to predict the energy delivery of the range of solar collector models.

 

    • Transient Energy System Simulation (TRNSYS) software was used to simulate the solar collector field performance.

 

The feasibility study showed that evacuated tube collectors were most appropriate for this project.

Detailed design was conducted by engineering company WSP Lincolne Scott. The design was based on a closed loop system that uses a variable speed drive pump control to maintain the 95°C hot water temperature required by the chiller. The design enables hot water to be used for domestic hot water/space heating or stored in two 5,000 litre tanks when demand for hospital cooling is low.

Greenland Systems was awarded the contract to supply the solar collector tubes and the installation was completed by Echuca Hospital’s engineering team. The project was commissioned into service in March 2011.

Project Outcomes

After the first 3 months of operation, the net annual savings are estimated to be $60,000 allowing for reduced electricity costs, and increased gas consumption. The total greenhouse gas savings approximate 1,400 tonnes of carbon dioxide equivalent (tCO2-e) per year. This installation has also reduced electricity demand by about 14 per cent and has allowed Echuca Hospital to avoid costly upgrades to its electricity supply.

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clients Echuca Regional Health for Echuca Hospital
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project_snapshot_image 227
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project_snapshot_details_0_snap_title Project developer
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project_snapshot_details_0_snap_details Echuca Regional Health
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project_snapshot_details_1_snap_title Solar field engineering and design
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project_snapshot_details_1_snap_details WSP Lincolne Scott
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project_snapshot_details_2_snap_title Renewable energy technology type
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project_snapshot_details_2_snap_details Solar thermal
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project_snapshot_details_3_snap_title Objective
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project_snapshot_details_3_snap_details Provide heat supply to drive the cooling process in an absorption chiller achieving cost savings and reduced emissions.
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project_snapshot_details_4_snap_title Plant type
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project_snapshot_details_4_snap_details Evacuated tube collector field, single-stage\r\nabsorption chiller.
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project_snapshot_details_5_snap_title Project commissioning date
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project_snapshot_details_5_snap_details March 2011
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project_snapshot_details_6_snap_title Energy cost saving
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project_snapshot_details_6_snap_details $60,000 per year
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project_snapshot_details_7_snap_title Electricity savings
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project_snapshot_details_7_snap_details 1,373 MWh per year
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project_snapshot_details_8_snap_title Peak demand savings
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project_snapshot_details_8_snap_details 14%
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project_snapshot_details 11
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project_snapshot_additional_details
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project_snapshot_details_9_snap_title GHG pollution offset
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project_snapshot_details_9_snap_details 1,400 tCO2-e per year
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project_snapshot_details_10_snap_title Upgrade savings
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project_snapshot_details_10_snap_details Existing electricity grid connection used.
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