Buildings are responsible for consuming up to 40% of the total energy in European Countries, with a related emission of 40% of total greenhouse gas emissions. A percentage of 65% of residential sector requirements is for space heating and cooling demand. This scenario led to a great in terest in developing energy efficiency policies to reduce the primary energy demand and the greenhouse gas emissions, as required by climate and energy targets of European Union within 2030. In this paper three different air conditioning systems for space heating and cooling of a building located in Naples, are investigated. The multi - storey building has six floors, the first two are intended for office use, while the remaining are residential apartments. In the first solution the building space heating dem and is satisfied by a centralised natural gas boiler delivering up to 65 kW of thermal power, while the cooling load is met by an electric chiller with a nominal cooling power of 59.8 kW. Both energy conversion systems interact with a thermal energy storag e tank. The second analysed plant is based on distributed energy conversion systems. It consists of twelve boilers, each one able to delivers up to 25 kW, and twelve electric chillers, each one with a nominal cooling power of 6.14 kW. In both cases the bui lding electric energy demand is satisfied by the external electric grid. The third option consists of a trigeneration plant based on a cogeneration system coupled with an absorption chiller. This centralized system meets base electric, thermal and cooling loads of the building, while for peak loads the electric grid, a natural gas fuelled boiler and an electric chiller are considered respectively. The aim of this paper is to compare the energy and environmental performance of the centralised systems with th ose achieved by the distributed energy conversion systems, by means of dynamic simulations carried out in TRNSYS 17 software. The results show that the best energy performance are achieved by the decentralised system (Case#1), with a primary energy saving of 9.24% with respect centralized conventional system (Case#2). On the other hand the centralized plant based on cogeneration technology (Case#3) reaches the greatest CO 2 equivalent avoided emission (17.23%) in comparison with Case#2 configuration
Comparison of centralized and decentralized air-conditioning systems for a multi-storey/multi users building
E. Marrasso;C Roselli
;M. Sasso;
2018-01-01
Abstract
Buildings are responsible for consuming up to 40% of the total energy in European Countries, with a related emission of 40% of total greenhouse gas emissions. A percentage of 65% of residential sector requirements is for space heating and cooling demand. This scenario led to a great in terest in developing energy efficiency policies to reduce the primary energy demand and the greenhouse gas emissions, as required by climate and energy targets of European Union within 2030. In this paper three different air conditioning systems for space heating and cooling of a building located in Naples, are investigated. The multi - storey building has six floors, the first two are intended for office use, while the remaining are residential apartments. In the first solution the building space heating dem and is satisfied by a centralised natural gas boiler delivering up to 65 kW of thermal power, while the cooling load is met by an electric chiller with a nominal cooling power of 59.8 kW. Both energy conversion systems interact with a thermal energy storag e tank. The second analysed plant is based on distributed energy conversion systems. It consists of twelve boilers, each one able to delivers up to 25 kW, and twelve electric chillers, each one with a nominal cooling power of 6.14 kW. In both cases the bui lding electric energy demand is satisfied by the external electric grid. The third option consists of a trigeneration plant based on a cogeneration system coupled with an absorption chiller. This centralized system meets base electric, thermal and cooling loads of the building, while for peak loads the electric grid, a natural gas fuelled boiler and an electric chiller are considered respectively. The aim of this paper is to compare the energy and environmental performance of the centralised systems with th ose achieved by the distributed energy conversion systems, by means of dynamic simulations carried out in TRNSYS 17 software. The results show that the best energy performance are achieved by the decentralised system (Case#1), with a primary energy saving of 9.24% with respect centralized conventional system (Case#2). On the other hand the centralized plant based on cogeneration technology (Case#3) reaches the greatest CO 2 equivalent avoided emission (17.23%) in comparison with Case#2 configurationI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
