2026-09-21T09:24:50Zhttps://dora.dmu.ac.uk/server/oai/requestoai:dora.dmu.ac.uk:2086/108912019-03-20T03:53:21Zcom_2086_2388col_2086_2389
Solar desiccant evaporative cooling with multivalent use of solar thermal heat
Bader, Tobias
Solar DEC (Desiccant and Evaporative Cooling) air-conditioning is a renewable technological approach to the
future air-conditioning of buildings driven with solar-thermal heat. The principal acceptance of solar airconditioning
has led to system prototypes mainly across Europe, however the diffusion of this innovative
technology is proceeding slowly due to little field testing experience. In climates with coexisting heating demand
particularly, a multivalent system approach that utilizes solar-heat not only for air-conditioning but also for hot
water preparation and heating has potential as a feasible concept. However, previous research focused on
systems using solar heat exclusively for the DEC-process.
This research contributes to the advancement of the solar DEC-technology with multivalent use of solar thermal
heat. The investigation consists of an initial detailed in-situ monitoring analysis of a system prototype operated
in an industrial environment, followed by the development of optimised system concepts and a climate-specific
analysis of the solar DEC-technology. The monitoring provided in-depth knowledge about the system operation,
revealing the reasons for the insufficient refrigeration capacity achieved in practice. A detailed simulation model
for an entire multivalent solar DEC-system including the heat sinks, DEC-system, heating and hot-water
preparation was developed and a DEC-control strategy has been formulated. A new optimised control strategy
for multivalent systems with simultaneous sink supply concept was devised. A sensitivity analysis was carried
out to investigate the key design parameters for the dimensioning of multivalent solar DEC-systems. The
research concluded that the auxiliary primary energy consumption of the optimised system was lower by one
third compared to the initial system. Finally, a methodological zoning approach was developed, to systematically
produce design-specific outline data for the application of the solar DEC-technology at climatically different
sites.
De Montfort University
2014-10
Thesis or dissertation
Doctoral
PhD
en
http://hdl.handle.net/2086/10891
https://dora.dmu.ac.uk/bitstreams/6e6a8322-4d5b-4d6d-9100-099484d3ffcd/download
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https://dora.dmu.ac.uk/bitstreams/b7550c1f-db48-484f-bc3f-99758d191802/download
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Solar cooling
air-conditioning
DEC-system
DEC control
desiccant evaporative cooling
solar-thermal heat
multivalent system
in-situ monitoring
simulation
supervisory control
global effectiveness
climate-specific system planning
Faculty of Technology
Institute of Energy and Sustainable Development