Author, as appears in the article.: Vallès M; Bourouis M; Boer D
Department: Enginyeria Química
URV's Author/s: Boer, Dieter-Thomas / Bourouis Chebata, Mahmoud / Vallès Rasquera, Joan Manel
Keywords: Water Transformers Systems Solar heating and cooling Reversible absorption cycle Pump Pressure-drop Performance Nitrate Nh3/lino3 Ammonia-lithium nitrate Ammonia Absorption heat transformer Absorption cooling Absorber
Abstract: © 2019 Elsevier Ltd The Energy Performance of Buildings Directive (EPBD) requires that all new buildings in the European Union be nearly zero energy buildings (NZEB) by the end of 2020. Consequently, energy saving measures must be introduced in the design phase. However, in most cases there will still be a cooling and heating demand, which could be satisfied using renewable energy. Of all of the renewable energy resources, solar energy has been given most attention since it is CO2 neutral. The present study investigates a new solar thermally-driven system that meets the heating and cooling demands of buildings. This system consists of a reversible absorption cycle, which operates as a single-effect absorption cycle in the cooling mode and as a heat transformer in the heating mode. The components of both cycles are the same, and only the flow direction inside the system changes. The working pair selected was ammonia-lithium nitrate so no rectifier is required and there are no problems of refrigerant freezing at low condensing temperatures when the cycle operates as a heat transformer. For both cycles, a mathematical model is developed to obtain feasible driving temperatures and evaluate the cycle's coefficient of performance (COP) depending on the ambient temperature. The results show that in the heating mode, the heat transformer cycle can be driven with a heat source at 40 °C to produce hot water at 55 °C at an ambient temperature of 0 °C and a COP of about 0.45. In addition, the lower the ambient temperature, the higher the hot water temperature that the heat transformer can produce. In the cooling mode, the single-effect absorption cycle can be driven with a heat source at 85 °C to produce chilled water at 7 °C at an ambient temperature of 30 °C and a COP of 0.6. As a result, this configuration overcomes the limitations of existing absorption cycles and presents an interesting alternative to existing heating and cooling systems.
Thematic Areas: Thermodynamics Química Medicina iii Mechanics Mechanical engineering Materiais Matemática / probabilidade e estatística Interdisciplinar Industrial and manufacturing engineering Fluid flow and transfer processes Engineering, mechanical Engenharias iv Engenharias iii Engenharias ii Engenharias i Energy engineering and power technology Energy & fuels Ciências biológicas ii Ciências ambientais Ciências agrárias i Ciência de alimentos Ciência da computação Biodiversidade Astronomia / física
ISSN: 13594311
Author's mail: manel.valles@urv.cat mahmoud.bourouis@urv.cat dieter.boer@urv.cat
Author identifier: 0000-0002-0748-1287 0000-0003-2476-5967 0000-0002-5532-6409
Record's date: 2024-06-22
Papper version: info:eu-repo/semantics/acceptedVersion
Link to the original source: https://www.sciencedirect.com/science/article/abs/pii/S1359431119351695
Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Applied Thermal Engineering. 168 (114836): Article number 114836-
APA: Vallès M; Bourouis M; Boer D (2020). Solar-driven absorption cycle for space heating and cooling. Applied Thermal Engineering, 168(114836), Article number 114836-. DOI: 10.1016/j.applthermaleng.2019.114836
Article's DOI: 10.1016/j.applthermaleng.2019.114836
Entity: Universitat Rovira i Virgili
Journal publication year: 2020
Publication Type: Journal Publications
Repositori URV