Research Papers

Design Optimization of a Sorption Integrated Sydney Type Vacuum Tube Collector

[+] Author and Article Information
Olof Hallström

School of Business, Society and Engineering,
Mälardalen University,
Box 883,
Västerås 721 23, Sweden

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received June 27, 2016; final manuscript received September 15, 2016; published online November 10, 2016. Assoc. Editor: Jorge E. Gonzalez.

J. Sol. Energy Eng 139(2), 021007 (Nov 10, 2016) (11 pages) Paper No: SOL-16-1301; doi: 10.1115/1.4034912 History: Received June 27, 2016; Revised September 15, 2016

In order to reach the targets on emissions set by the European Commission, both new and existing buildings must reduce their fossil fuel inputs. Solar thermal cooling supplying on-site renewable heating and cooling could potentially contribute toward this goal. In this paper, a novel concept for solar thermal cooling providing efficient coproduction of cooling and heating based on sorption integrated vacuum tube collectors is proposed. A prototype collector has been constructed and tested in a solar laboratory based on a method developed specifically for sorption integrated collectors. From the test results, the key performance parameters have been determined and used to calibrate a mathematical model for trnsys environment. System simulation has been conducted to optimize the collector and sorption module configuration by performing a parametric study where different vacuum tube center–center (C–C) distances and sorption module designs are tested for a generic hotel in Ankara, Turkey. The parametric study showed that the heating and cooling output per year can be as high as 1000 kWh/m2 for solar fractions above 50%, and that the output per sorption module compared to the prototype can more than double with an optimized design. Furthermore, cooling conversion efficiencies defined as total cooling output per total solar insolation can be as high as 26% while simultaneously converting 35–40% of the incident solar energy into useful hot water.

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Fig. 1

Operation cycle for a sorption module in a P–T diagram

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Fig. 2

Conceptual layout of the integrated sorption collector. Qdes, Qcond, Qabs, and Qevap refer to the input and output powers of the sorption modules for the two operating phases.

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Fig. 3

Cross section for reactor (left) and C/E (right) heat exchangers and side view of sorption module (below)

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Fig. 4

Complete assembly of the collector prototype (a) and collector mounted during testing (b)

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Fig. 5

Test setup at Fraunhofer ISE

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Fig. 6

Equivalent resistance network for type 827

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Fig. 7

Simulated annual heating, cooling, and DHW demand (MWh) for a generic hotel in Ankara (a) [21] and layout of system simulation model (b)

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Fig. 8

Results based on collector aperture area from the efficiency and stagnation measurements at 979 W/m2 plotted both using the mean temperature (b) and the estimated absorber temperature (a), respectively. The stagnation point is reduced 15 K from measured in order to fit all the static measurements.

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Fig. 9

Model validation based on one of the static measurements. Suffixes S and M refer to simulated and measured, respectively.

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Fig. 10

Simulation results with 285 m2 collector area from the parametric runs for Ankara. (b) shows the heating and cooling provided per sorption module during heat pump mode (summer).

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Fig. 11

Cooling power distribution per m2 of aperture area for the five simulation runs

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Fig. 12

Cooling and heating efficiencies over the year for simulation 5




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