Material Study of a Facade-Integrated Adsorption System for Solar Cooling of Buildings

DOI

10.2991/978-94-6463-455-6_16How to use a DOI?

Keywords

Solar Energy; Thermal Energy Storage; Adsorption Chiller; Material Optimization; Building Energy Systems

Abstract

Within the Collaborative Research Center 1244 at the University of Stuttgart, a facade-integrated solar cooling system for lightweight buildings is being developed. It addresses the reduction of CO2 emissions twofold. First, lightweight buildings require less concrete but require cooling due to their low thermal capacity. Secondly, the implementation of solar cooling systems counteracts the steadily growing global demand for energy for space cooling. The system is driven by a facade-integrated adsorber that has the functionality of an energy storage and is regenerated by absorbed solar irradiation. The desorbed water vapor is led into a condenser that is located on the opposite facade of the building. To provide cooling, the regenerated adsorber adsorbs water vapor from an evaporator located at the ceiling of the cooled room. The theoretical proof of concept was achieved in previous works, where a Matlab simulation model was developed. In this work, the influence of the adsorbent material on the system’s behavior is investigated. Originally, zeolite 13X was considered and implemented into the model with the Dubinin-Asthakov approach. Here, the coefficients of the Dubinin-Asthakov equation are optimized for maximum cooling energy. For the identified range of beneficial values, coefficients of real working pairs are selected from the literature. In the results of this work, silica gels and modified zeolites, so-called zeotypes, show better performance, as they are suitable for lower desorption temperatures. The originally achieved cooling power with zeolite 13X was 1.15 kWh per day and can be increased to 1.47 kWh with the zeotype AQSOA-Z02 and 1.45 kWh with the silica gel RD2560. The resulting COP has improved from 0.243 to 0.311 and 0.308, respectively. Additionally, to the improved efficiency, the peak temperature of the adsorber is reduced.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Download article (PDF)

TY  - CONF
AU  - Tim Dubies
AU  - Olaf Böckmann
AU  - Micha Schäfer
PY  - 2024
DA  - 2024/07/11
TI  - Material Study of a Facade-Integrated Adsorption System for Solar Cooling of Buildings
BT  - Proceedings of the International Renewable Energy Storage and Systems Conference (IRES 2023)
PB  - Atlantis Press
SP  - 151
EP  - 162
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-455-6_16
DO  - 10.2991/978-94-6463-455-6_16
ID  - Dubies2024
ER  -