alexa New Control Strategy for a Hybrid Ground Source Heat Pump System coupled to a Closed Circuit Cooling Tower
ISSN: 2168-9873

Journal of Applied Mechanical Engineering
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Research Article

New Control Strategy for a Hybrid Ground Source Heat Pump System coupled to a Closed Circuit Cooling Tower

Zoi Sagia1* and Constantinos Rakopoulos2
1Laboratory of Thermal Processes, Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, Greece
2Laboratory of Internal Combustion Engines, Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, Greece
Corresponding Author : Zoi Sagia
Department of Thermal Engineering
School of Mechanical Engineering
National Technical University of Athens, Greece
Email: [email protected]
Received April 11, 2012; Accepted May 02, 2012; Published May 04, 2012
Citation: Sagia Z, Rakopoulos C (2012) New Control Strategy for a Hybrid Ground Source Heat Pump System coupled to a Closed Circuit Cooling Tower. J Appl Mech Eng 1:108. doi:10.4172/2168-9873.1000108
Copyright: © 2012 Sagia Z, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Hybrid Ground Source Heat Pump Systems (HGSHPSs) which include cooling towers are widely used so as to improve Ground Source Heat Pump Systems (GSHPSs) efficiency in cooling dominated applications. A Greek office building with total cooled area 1000 m2 is examined. The whole system is modelled using TRNSYS 17. System’s operation is optimized using TRNOPT 17 so as to meet the maximum cooling load during the net cooling period, when no heating loads occur, by minimizing Ground Heat Exchangers (GHEs) depth. Three control strategies, based on continuous observation of critical temperatures, are applied to the optimized system. Each strategy attempts to achieve a further optimization of HGSHPS’s operation by minimizing the electric power consumption. In the first one, the cooling tower is turned on when the difference between the fluid temperature exiting heat pumps and ambient air wet bulb temperature exceeds 10°C. In the second one, the cooling tower is on when the fluid temperature exiting GHEs is greater than 28°C. In the third one, the cooling tower starts to operate when the fluid temperature exiting heat pumps is greater than 32°C. Each of these control points is normalized by the fluid temperature exiting the hot side of Heat Exchanger which comes in between the ground loop and the Closed Circuit Cooling Tower loop. The new set points define three new control strategies which are examined so as to achieve a further improvement to HGSHPS’s operation.

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