Research Papers: Energy Systems Analysis

Response Surface Optimization of an Ammonia–Water Combined Power/Cooling Cycle Based on Exergetic Analysis

[+] Author and Article Information
Jesús M. García

Department of Mechanical Engineering,
Universidad del Norte,
Barranquilla, Colombia
e-mail: jesusmg@uninorte.edu.co

Ricardo Vasquez Padilla

School of Environment, Science
and Engineering,
Southern Cross University,
Lismore, New South Wales 2480, Australia
e-mail: ricardo.vasquez.padilla@scu.edu.au

Marco E. Sanjuan

Department of Mechanical Engineering,
Universidad del Norte,
Barranquilla, Colombia
e-mail: msanjuan@uninorte.edu.co

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 28, 2016; final manuscript received June 21, 2016; published online July 12, 2016. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 139(2), 022001 (Jul 12, 2016) (9 pages) Paper No: JERT-16-1058; doi: 10.1115/1.4034025 History: Received January 28, 2016; Revised June 21, 2016

Finding optimal operating conditions of solar-based power and cooling systems is always a challenge. Performance of these systems is highly dependent on several important parameters, which influence not only the long-term efficiency but also its technical and economic feasibility. This paper studies the operation/configuration problem of an ammonia–water power and cooling cycle using an exergetic and statistical analysis. The Modeling developed in Matlab® and REFPROP 9.0 was used to calculate the thermodynamic properties of the ammonia–water mixture. The thermodynamic model and properties of the ammonia/water mixture were validated with previous models found in the literature. Optimal operating conditions of the combined cycle were obtained by using response surface technique and the ratio between exergetic efficiency and exergy destruction was used as response variable. The results showed that the response variable is highly influenced by the ammonia concentration, pressure ratio (PR), turbine efficiency, and pinch point temperature in the heat exchanger. Finally, the combined cycle was integrated with a solar field using two types of concentrated solar collectors.

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Grahic Jump Location
Fig. 1

Schematic description of the combined power/cooling cycle. Case R + S. Adapted from Ref. [15].

Grahic Jump Location
Fig. 2

Validation of the thermodynamic properties of saturated ammonia–water mixture at different temperatures. A: Properties calculated by Refprop 9.0 [24], B: properties used by Padilla et al. [15] (a) pressure, (b) enthalpy, and (c) entropy.

Grahic Jump Location
Fig. 3

Validation of the combined cycle for network and cooling output. Reference model developed by Padilla et al. [15] (a) network output and (b) cooling output.

Grahic Jump Location
Fig. 4

Total exergy destruction of the combined cycle and each component

Grahic Jump Location
Fig. 5

Fastest ascent route results for current process simulation

Grahic Jump Location
Fig. 6

Typical DNI on June 21st for Daggett, CA [27] and the net heat that is produced by both technologies

Grahic Jump Location
Fig. 7

Comparison between PTC and LFC integrated with the combined cycle (a) (Φ), (b) net work output, and (c) cooling output



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