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Absorption cooling is a method that uses heat instead of electricity to produce a cooling load. It is applicable mainly to commercial and industrial buildings and there are many absorption chillers in the UK. Most. Absorption cooling is unlikely to replace conventional refrigeration systems, but in certain conditions it has environmental and economic benefits, specially in the existence of a CHP plant that operates below maximum capacity, available waste heat, or a low-cost source of fuel (such as landfill gas) by making use of heat that would otherwise be wasted.|
Absorption chillers reduce the overall carbon dioxide emissions from a building.
When combined with a CHP plant, absorption cooling becomes attractive as it introduces an additional consumption of heat and thus improves viability of the CHP plant, specially in summer. Moreover, the operation of an absorption chiller creates much less noise and vibration compare to other cooling technologies.
The technology relies on pairs of chemicals that have strong affinity to dissolve in one another and enable the heat absorption and then rejection process.
There are two basic types of absorption chiller using well-proven pairs of chemicals:
Lithium bromide-water systems
Lithium bromide/water systems are widely available as packaged units of cooling capacity between 100 kW and 1000+ kW. A technical issue is the temperature of the chilled water, which can be reduced down to no lower than 5°C.
Ammonia/water systems are available in small (30-100kW), medium (100-1000kW) and large (>1000kw) sizes.
The efficiency of this process is defined by the Coefficient of Performance (COP), which is the produced cooling effect divided by the energy input to the system (in kW). The COP can range between 0.7 for standard plants and 4 for more complex and efficient chillers. Absorption chillers reduce the overall carbon dioxide emissions from a building.
The environmental impact of an absorption chiller can be compared with a conventional refrigeration plant using the Total Equivalent Warming Impact (TEWI) value, which is an index developed by the British Refrigeration Association.
Future BY Energy
Future BY Energy Ltd is a professional energy assessor company with a rich understanding of the UK energy market. We offer independent professional expertise in mechanical engineering for all domestic and commercial buildings and strategic energy advice. As expert designers and specifiers of heating-cooling systems, we pride ourselves in finding affordable energy efficient solutions for new and existing buildings. We have top level experience in a wide range of building types in both commercial and domestic sectors.
As registered energy assessors we provide:
• Domestic Energy Performance Certificates (EPC)
• SAP calculation and predicted energy assessment for new built dwellings (EPC-SAP/PartL)
• SBEM calculation for Commercial buildings (SBEM/Part L)
• Commercial Energy Performance Certificates (EPC)
• Display Energy Certificates for Public buildings (DEC)
• Air Conditioning Inspections (TM44)
• Asbestos surveys and consultancy
• Air permeability-Leakage test
• Sound test and acoustic consultancy
Please do not hesitate to contact, Behdad Yazdani, on 02081440820, who will be pleased to advise you.