DUBAL Energy Optimization Absorption Chiller Pilot Project Global Sustainable Cities Network - 2014 23 January 2014 Tariq Alzarooni Manager: Asset Management: Power and Desalination
Innovation in energy-conservation Reduce power consumption Improve efficiency As part of DUBAL s continuous effort to reduce its energy consumption and carbon foot print, several projects have been initiated 23-Jan-14 Global Sustainable Cities Network - 2014 2
Agenda The Concept Features Application Efficiency Enhancement Net Benefits 23 Jan 14 Global Sustainable Cities Network - 2014 3
Agenda The Concept Features Application Efficiency Enhancement Net Benefits 23 Jan 14 Global Sustainable Cities Network - 2014 4
The Concept - Double Effect Vapour Absorption Chiller 5
Agenda The Concept Features Application Efficiency Enhancement Net Benefits 23 Jan 14 Global Sustainable Cities Network - 2014 6
Features Absorption Chiller Electrical Chiller Basic Cycle Heat Work Electrical Power Used Low High Operation Cost Low High Maintenance Cost Low High Noise Low High Environment Hazard Total CFC free Potential CFC Energy Source Waste Energy or Solar Energy Only electrical Carbon Footprint Low High 23 Jan 14 Absorption Chiller Inauguration 7
Agenda The Concept Features Application Efficiency Enhancement Net Benefits 23 Jan 14 Absorption Chiller Inauguration 8
Application in DUBAL Power Plant DUBAL air conditioning systems are operated by electrical driven vapour compression chillers As DUBAL power plant has readily available steam generated for CC/Cogen, it is an ideal source of energy for Absorption Chillers application This pilot project installed in DESAL control building, is mainly for comfort cooling. Other applications for equipment cooling, etc can be considered in future. 23 Jan 14 Global Sustainable Cities Network - 2014 9
Pilot Project Scope Desal Control building - pilot project location selected due to close proximity of steam, cooling water and existing air-conditioning system can be retrofitted Absorption chiller sizing was recommended by Consultant after evaluating cooling requirements Installed on rooftop beside the existing electrical chillers, which will be subsequently be kept on standby 23 Jan 14 Global Sustainable Cities Network - 2014 10
Existing Electrical Chillers 23 Jan 14 Absorption Chiller Inauguration 11
New Absorption Chiller Cooling Tower Absorption Chiller 160TR 23 Jan 14 Global Sustainable Cities Network - 2014 12
Performance Comparison Absorption Chiller Vs Electrical Chiller Absorption Electrical Cooling Capacity(TR) 160 x 1 unit 80 x 3 units Rated Power (kw) 47 324 Steam 8 bar, 0.6 t/h 0 Power kwh/yr 397,727 1,024,527 Saving kwh/yr 626,800 (60%) (All figures are quoted in Energy Analysis Report by Project Consultant DC PRO Engineering) 23 Jan 14 Global Sustainable Cities Network - 2014 13
Agenda The Concept Features Application Efficiency Enhancement Net Benefits 23 Jan 14 Global Sustainable Cities Network - 2014 14
Efficiency Enhancement Reduce auxiliary power consumption 628,800 kwh/year Effective usage of 0.6 t/h low pressure steam Future potential applications Turbine Inlet Air Cooling, etc 23 Jan 14 Global Sustainable Cities Network - 2014 15
Agenda The Concept Features Application Efficiency Enhancement Net Benefits 23 Jan 14 Global Sustainable Cities Network - 2014 16
Net Benefits Innovative way to replace high electrical energy equipment Maximize utilization from fuel-free steam Project objective achieved, plus reduction of estimated carbon footprint of 350 tons CO 2 /year, ~ 180 cars off the road/year 23 Jan 14 Global Sustainable Cities Network - 2014 17
Thank you
BACK UP 23 Jan 14 Global Sustainable Cities Network - 2014 19
Absorption Chiller Concept Boiling point of the water is a function of pressure. At atmospheric pressure water boils at 100 deg. C. When maintained at high vacuum, water will boil and subcool itself. The boiling point of the water at 6 mmhg (abs) is 3.7 deg. C. Lithium Bromide (LiBr) has the property to absorb water due to its chemical affinity. At higher concentration and lower temperature LiBr absorbs water vapour (refrigerant vapour) very effectively As Lithium Bromide becomes dilute it loses its capacity to absorb water vapour. It thus needs to be reconcentrated using a heat source. Heat source may be Steam or Flue gases or even Hot water The heating causes the solution to release the absorbed refrigerant in the form of vapour. This vapour is cooled in a separate chamber to become liquid refrigerant. Chilled water is generated via heat transfer by vaporisation of liquid refrigerant and the process is continuously repeated. 23 Jan 14 Global Sustainable Cities Network - 2014 20