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of the most cost-effective ways to produce energy while reducing greenhouse gases emissions. Cogeneration installations result in CO2 emissions reduction of up to 50% when compared to separate production of heat and electricity. In addition, in many instances homes are too widely spaced to allow use of district heating and ,thus, domestic cogeneration will be the only way of bringing the environmental benefits of cogeneration to these homes. THE OPERATION OF THE SYSTEM Technical requirements As example of the overall functioning of such systems, a system based on the Stirling engine is illustrated below. Heating control Stirling engine Frequency / voltage protection exhausts Air Gas Consumer unit Export/Import of ELECTRICITY HEAT Network issues Electrical Supply to House Two- meter unit Courtesy Sigma elektroteknisk. The system is installed like a modern heating boiler. It can be put for example in kitchens or basements in a fridge-like container, with the same noise level and the same volume. Maintenance requirements are quite low: for example the Sachs engine needs to be maintained every 3.500 operating hours (equivalent to a service of about every 150.000 to 200.000 km for a car). Network issues The operation of the system normally implies export of electricity to the grid, the system must be connected to the mains network of the electricity supplier. Transparent and fair arrangements must be found with network operators in order not to jeopardise security of both systems. However, there are no major technical obstacles to connection of micro-cogeneration systems to grids and the issue is more a commercial one since it involves defining buy-back rates for the exported electricity and the potential back-up supplies from the electricity supplier. Such issues are now well known and are common to most cogeneration businesses. 5PDF Image | An Introduction to Micro- Cogeneration
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