Open AccessApplication of the TEWI Methodology to a Desiccant Cooling System Interacting with a Microcogenerator
Author(s) -
Giovanni Angrisani,
Filippo de Rossi,
Carlo Roselli,
Maurizio Sasso
Publication year - 2015
Publication title -
global journal of energy technology research updates
Language(s) - English
Resource type - Journals
ISSN - 2409-5818
DOI - 10.15377/2409-5818.2015.02.01.2
Subject(s) - refrigerant , desiccant , greenhouse gas , environmental science , renewable energy , vapor compression refrigeration , air conditioning , global warming , fossil fuel , chiller , global warming potential , electricity , process engineering , life cycle assessment , environmental engineering , waste management , engineering , meteorology , gas compressor , climate change , production (economics) , mechanical engineering , thermodynamics , ecology , physics , electrical engineering , macroeconomics , economics , biology
Desiccant cooling systems, supplied by fossil or renewable fuels, represent a very interesting alternative to conventional electric units based on cooling dehumidification for air conditioning purposes, as they can achieve significant energy and emissions savings. The analysis of environmental impact of energy conversion devices, e.g. in terms of global warming effect, is usually limited to energy-related emissions (indirect contribution), neglecting direct greenhouse gas emissions related to working fluids, such as refrigerants. The Total Equivalent Warming Impact (TEWI) is a more comprehensive methodology, as it takes into account both direct and an indirect contributions to global warming. In this paper, this method is applied to a small scale trigeneration system, in which a microcogenerator, a chiller and a boiler interact with a hybrid desiccant-based cooling system, equipped with a silica-gel desiccant wheel. This trigeneration system is compared with other two systems, in order to assess its potentiality in terms of TEWI reduction. The different direct and indirect contributions of the several equipment are evaluated, and the share of the direct contribution is investigated, considering both the overall TEWI of the complete system, and that of the electric vapour compression device only. Finally, the effect of the greenhouse gas emissions of the electricity production mix and of different values of the Global Warming Potential (GWP) of the refrigerant fluid on the overall TEWI of the three compared systems is investigated.