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Energies 2017, 10(5), 733; doi:10.3390/en10050733

Modeling and Optimization of a CoolingTower-Assisted Heat Pump System

College of Civil Engineering, Hunan University, Changsha 410082, China
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Authors to whom correspondence should be addressed.
Academic Editor: Hongxing Yang
Received: 15 April 2017 / Revised: 16 May 2017 / Accepted: 17 May 2017 / Published: 20 May 2017
(This article belongs to the Special Issue Solar Energy Application in Buildings)
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Abstract

To minimize the total energy consumption of a cooling tower-assisted heat pump (CTAHP) system in cooling mode, a model-based control strategy with hybrid optimization algorithm for the system is presented in this paper. An existing experimental device, which mainly contains a closed wet cooling tower with counter flow construction, a condenser water loop and a water-to-water heat pump unit, is selected as the study object. Theoretical and empirical models of the related components and their interactions are developed. The four variables, viz. desired cooling load, ambient wet-bulb temperature, temperature and flow rate of chilled water at the inlet of evaporator, are set to independent variables. The system power consumption can be minimized by optimizing input powers of cooling tower fan, spray water pump, condenser water pump and compressor. The optimal input power of spray water pump is determined experimentally. Implemented on MATLAB, a hybrid optimization algorithm, which combines the Limited memory Broyden-Fletcher-Goldfarb-Shanno (L-BFGS) algorithm with the greedy diffusion search (GDS) algorithm, is incorporated to solve the minimization problem of energy consumption and predict the system’s optimal set-points under quasi-steady-state conditions. The integrated simulation tool is validated against experimental data. The results obtained demonstrate the proposed operation strategy is reliable, and can save energy by 20.8% as compared to an uncontrolled system under certain testing conditions. View Full-Text
Keywords: cooling tower-assisted heat pump; theoretical and empirical models; energy saving; hybrid optimization algorithm cooling tower-assisted heat pump; theoretical and empirical models; energy saving; hybrid optimization algorithm
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MDPI and ACS Style

Wei, X.; Li, N.; Peng, J.; Cheng, J.; Hu, J.; Wang, M. Modeling and Optimization of a CoolingTower-Assisted Heat Pump System. Energies 2017, 10, 733.

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