10 The energetic concept of the exhibition halls is exem plary from ecological and economic aspects For ventilation Messe Stuttgart uses an innovative lay er ventilation system which is characterised by energy efficiency and improved thermal room comfort Instead of circulating and exchanging all the room air only the lower hall area up to a height of roughly four metres is supplied with fresh air Compared with conventional ventilation systems a ventilation volume of 1 million m h can therefore be saved while still obtaining excel lent air quality This ventilation principle is also eco nomically advantageous since smaller ventilation units are required for this purpose thereby reducing the number of utilised heating and cooling engineer ing systems by 30 per cent The hall temperatures are monitored constantly and the supply air temperatures are adjusted according to the number of visitors the amount of solar radiation and the indoor and outdoor temperature In addition to energy conserving gas condensing tech nology with exhaust heat exchangers for generating heat Messe Stuttgart has a highly efficient ventilation system High exhaust air temperatures facilitate eco nomic use of heat recovery systems with heat recovery efficiencies of more than 80 per cent This means that almost all of the energy used to heat the air can be recovered Unlike comparable trade fair companies the energy expenditure has therefore been reduced by around 1 3 million kWh while the required heating output is much lower This corresponds to the annual electricity consumption of 310 four person households The cooling system is supported by ecologically advan ced ice based cold storage systems Ice is produced during the night at low temperatures and relieves the pressure on the cooling units at peak load periods The cooling units were therefore constructed with a smaller design and there was no need to purchase another cooling unit This led to total savings of 15 6 million

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