CDM - Absorption Chiller in Dubal, Dubai, United Arab Emirates

2011
CDM - Absorption Chiller in Dubal, Dubai, United Arab Emirates
CDM - Absorption Chiller in Dubal, Dubai, United Arab Emirates
CDM - Absorption Chiller in Dubal, Dubai, United Arab Emirates
Kunde: 
Dubai Aluminium Company Ltd (Dubal) & Dubai Carbon Centre of Excellence (DCCE)
Project type: 
CDM small scale
Land: 
United Arab Emirates
Methodik: 
AMS II.C - Demand-side energy efficiency activities for specific technologies
  • Evaluating the feasibility of the small-scale CDM project
  • Elaboration of Project Design Document (PDD), including the Monitoring Plan
  • Calculation of the Dubal captive power plants emission factor
  • Calculation of the DEWA grid emission factor
  • Calculation of the project potential emissions reductions

The owner is the Dubai Aluminium Company Ltd (Dubal). It commenced operation in 1979. Currently the plant has capacity of more than 950,000 MT of aluminium per year. The plant is located in Dubai, part Jebel Ali, in the United Arab Emirates.The chillers are installed in almost every building within the aluminium plant to provide the cooling for the main production, supporting processes, maintenance and other buildings. Existing chillers use the vapour compression chiller (VCC) technology. These chillers are run by electricity only.  Project focuses on chillers in 21 buildings within the facility, with total installed cooling capacity of 4,200 TR (tons of refrigeration).The electricity requirement of the cooling process is covered by internal fossil-fuel based (natural gas and fuel oil) power generators and by minor imports from the Dubai electricity grid operated by Dubai Electricity and Water Authority (DEWA).The purpose of the project activity is reduction of the electricity consumption through implementation of energy efficiency measures - by replacing the existing energy demanding cooling/air-conditioning technology by the new chillers that use only a fraction of the electrical energy for the same output of cooling. The existing inefficient vapour compression chillers (VCCs) will be replaced by the vapour absorption chillers (VACs) that are powered by low grade thermal energy from a major part and use only a little electricity. The VACs can be run by heat or steam energy which in the case of the proposed project activity will be the waste steam from the aluminium production plant which is currently vented to the ambient without any utilization. Current VCCs consume ca 252,000 MWh of electricity per year. New VACs shall use only ca 10,000 MWh/y which represents annual energy savings of 242,000 MWh.The chillers replacement will result in energy efficiency improvement and thus the fossil fuels for the electricity production will be reduced and less greenhouse gases will be emitted due to the implementation of the project.Emission reductions due to energy efficiency improvement has been calculated based on the difference in the power consumption of the VCC and the VAC chillers and by using the emission factor of Dubal (own captive power plants and minor imports from the grid).Moreover, the VCCs use the chlorofluorocarbons/hydrochlorofluorocarbons (CFCs/HFCs) as refrigerant gases. By operation and maintenance of the VCCs these gases leak to atmosphere.  They are harmful ozone depleting substances and potent greenhouse gasses.  The VACs do not use them. Typical VACs refrigerants are ammonia or water salts which do not have greenhouse effect. Thus the project activity avoids emissions from this source, too. The project has been elaborated as a small-scale CDM project, with crediting period of 10 years. The project will in total contribute to ca 113,150 tonnes of CO2 emission reductions and it is expected to generate respective amount of the emission reduction certificates - Certified Emission Reductions (CERs).