Optimization of thermal processes in a variable air volume HVAC system

Zheng, G.R.; Zaheeruddin, Mohammed

doi:10.1016/0140-6701(96)89014-x

Cited by 8 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The optimal control strategy based on steady-state models of HV AC system has been investigated by Zheng and Zaheer-Uddin (1996). These models are interconnected to simulate the responses of the V A V system.…”

Section: Optimization Of Hv Ac System Controlmentioning

confidence: 99%

“…A system approach was proposed for the on-line control strategy of HV AC in which multiple set points are optimized simultaneously in order to improve the system responses and reduce energy use (Wang and Jin 2000;Zheng and Zaheer-Uddin 1996; Zaheer-Uddin and Patel 1993). Wang and Jin (2000) presented a control strategy using a system approach based on predicting the responses of overall system environment and energy performance to changes of control settings of HV AC system.…”

Section: Optimization Of Hv Ac System Controlmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of HVAC Control System Strategy Using Two-Objective Genetic Algorithm

Nassif¹,

Kajl²,

Sabourin³

2005

HVAC&R Research

148

View full text Add to dashboard Cite

Section: Optimization Of Hv Ac System Controlmentioning

confidence: 99%

Section: Optimization Of Hv Ac System Controlmentioning

confidence: 99%

Optimization of HVAC Control System Strategy Using Two-Objective Genetic Algorithm

Nassif¹,

Kajl²,

Sabourin³

2005

HVAC&R Research

148

View full text Add to dashboard Cite

“…Set points can be adjusted by the optimized supervisor to improve the operating efficiency. Significant efforts have been made in order to minimize the energy use associated with the operation of HVAC systems with focus on the optimization of controller set points in multi-zone variable air volume (VAV) systems [2][3][4]. Several studies have investigated the optimum set points for one or several local control loops.…”

Section: Introductionmentioning

confidence: 99%

A cost-effective operating strategy to reduce energy consumption in a HVAC system

Nassif

Moujaes

2008

Int. J. Energy Res.

View full text Add to dashboard Cite

SUMMARYThe operation of the building heating, ventilating, and air conditioning (HVAC) system is a critical activity in terms of optimizing the building's energy consumption, ensuring the occupants' comfort, and preserving air quality. The performance of HVAC systems can be improved through optimized supervisory control strategies. Set points can be adjusted by the optimized supervisor to improve the operating efficiency. This paper presents a cost-effective building operating strategy to reduce energy costs associated with the operation of the HVAC system. The strategy determines the set points of local-loop controllers used in a multi-zone HVAC system. The controller set points include the supply air temperature, the supply duct static pressure, and the chilled water supply temperature. The variation of zone air temperatures around the set point is also considered. The strategy provides proper set points to controllers for minimum energy use while maintaining the required thermal comfort. The proposed technology is computationally simple and suitable for online implementation; it requires access to some data that are already measured and therefore available in most existing building energy management and control systems. The strategy is evaluated for a case study in an existing variable air volume system. The results show that the proposed strategy may be an excellent means of reducing utility costs associated with maintaining or improving indoor environmental conditions. It may reduce energy consumption by about 11% when compared with the actual strategy applied on the investigated existing system.

show abstract

“…The choice of genetic algorithm arises from its robustness and in being acceptably good in finding near optimum solutions [18,19]. Genetic algorithm is most efficient when the optimization problem is not uni-modal or when the cost function is noisy [20,21].…”

mentioning

confidence: 99%

Optimized selection and operation of the combined chilled ceiling system and displacement ventilation

Ghaddar

Ghali

Saadeh

2010

Int. J. Energy Res.

View full text Add to dashboard Cite

SUMMARYThe objective of the work is to investigate the possibility of decreasing the operational energy consumption of the chilled ceiling (CC) and displacement ventilation (DV) hybrid cooling system by sizing the two subsystems to deliver appropriate CC sensible load removal capacity compared to total load and appropriate DV air supply flow rate. A system selection methodology is presented using Ghaddar et al. (ASHRAE Transactions (RP-1438) 2008; 143(2):574-587) design charts to size and generate feasible CC and DV subsystem sizes that meet the desired load and to select the appropriate combination of the system components; chilled panel, cooling coil, and fan. This step is followed by an optimization step of the system transient operation for each of the selected designs to evaluate the corresponding annual energy consumption of optimized operation per selection.The optimized selection methodology was demonstrated in a case study of an office space with known load profile in Beirut climate. It was found that the selection of equipment has a great impact in the operational cost resulting in a difference up to 19% between the various considered selections. An appropriate predictive correlation was derived between the annual energy consumption and the influential design parameters R and P for optimal operation of the CC/DV system.

show abstract

Optimization of thermal processes in a variable air volume HVAC system

Cited by 8 publications

References 0 publications

Optimization of HVAC Control System Strategy Using Two-Objective Genetic Algorithm

Optimization of HVAC Control System Strategy Using Two-Objective Genetic Algorithm

A cost-effective operating strategy to reduce energy consumption in a HVAC system

Optimized selection and operation of the combined chilled ceiling system and displacement ventilation

Contact Info

Product

Resources

About