Optimal supply air temperature with respect to energy use in a variable air volume system

Engdahl, Fredrik; Johansson, Dennis

doi:10.1016/j.enbuild.2003.09.007

Cited by 72 publications

(36 citation statements)

References 8 publications

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“…It appears that too low supply air temperature, relative to the optimal value, corresponds to a low risk of a substantial increase in the energy consumption. Simultaneously, too high supply air temperature, relative to the optimal value, may result in a substantial increase in the energy consumption [7]. Besides Ke & Mumma (1997) state that, the optimization of the primary flow rate and the supply air temperature provides better results in the temperate and dry climate [8].…”

Section: Introductionmentioning

confidence: 99%

Intake power measurement as a criterion for control of HVAC systems

2017

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Abstract. Under certain conditions, a HVAC system may consume less energy, provided that the initial response to the increasing heat gains is the increase in the airflow, while cooling is delayed. This ensures that the energy for cooling and reheat is reduced, while the fan power increases. Note that it is difficult to develop the following approach in the standard sequential control algorithms. On the other hand, the use of more complex algorithms than standard sequential algorithms is generally not encouraged because of the increase in the complexity of the control system and its resistance to respond to the varying parameters of a HVAC system. In this work, therefore, to avoid the following complications, the Intake Power Optimization algorithm is proposed. The Intake Power optimization algorithm is compared to the two sequential algorithms: Air conditioning and Airflow priority. To create the reference point enabling comparisons of the three strategies, the optimal control was established using the Nelder-Mead method. It is shown that the Intake power optimization algorithm provides a better control than the sequential algorithms and almost exclusively performs the optimal control actions. As an aside, the results indicate that the same heat gains, however, evenly distributed between rooms may contribute to the significant reduction of the energy demand.

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Section: Introductionmentioning

confidence: 99%

Intake power measurement as a criterion for control of HVAC systems

2017

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“…TRNSYS and GenOpt thermal comfort has been optimized by Laurent Magnier, Fariborz Haghighat [13]. VAV system optimal supply air temperature research was published by Fredrik Engdahl, Dennis Johansson [14]. Excel and Matlab combination for building retrofit strategies calculation has been carried out by Ehsan Asadi, Manuel Gameiro da Silva, Carlos Henggeler Antunes, Luķs Dias [15].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Office Building Façades in a Warm Summer Continental Climate

Hani¹,

Koiv²

2012

SGRE

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A typical office building model with conventional use and contemporary building systems was developed for façade optimization in continental climate. Wall, glazing area and window parameters were taken as the main variables. The objective function of optimization task described in this article is the minimization of cooling and heating energy consumption. The office building façades optimization was carried out using a combination of IDA Indoor Climate and Energy 4.5 and GenOpt. The process is described in detail so that the approach may be emulated. A hybrid multidimensional optimization algorithm GPSPSOCCHJ was used in calculation process. The optimization results are presented in four quick selection charts to assist architects, designers and real estate developers make suitable early stage façade selection decisions.

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“…The existing minimum air flow of a VAV terminal unit generally applies approximately 30~50% of the maximum air flow as a fixed value. Engdahl et al (2004) evaluated the energy savings potential of a controlled supply air temperature of a VAV based system by a comparison with a constant supply air temperature. 1) Taylor et al (2004) discussed the minimum air flow setpoint of the terminal units.…”

Section: Introductionmentioning

confidence: 99%

“…Engdahl et al (2004) evaluated the energy savings potential of a controlled supply air temperature of a VAV based system by a comparison with a constant supply air temperature. 1) Taylor et al (2004) discussed the minimum air flow setpoint of the terminal units. The actual controllable minimum air flow setpoint is normally different from the unit manufacturer's recommended minimum air flow setpoint for each unit size and for each standard control option.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Control Method Without Stratification of Single Duct VAV Terminal Units

Kim

Kang²,

Cho

2015

Journal of Asian Architecture and Building Engineering

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The objective of this study was to propose a stratification control method for the minimum air flow of a variable air volume (VAV) terminal unit. The minimum air flow rate of the VAV terminal unit is the key factor affecting thermal comfort, indoor air quality (IAQ), stratification and energy consumption depending on the operating mode of the VAV system. Therefore, selecting the proper minimum air flow is very important. In this study, a building simulation was conducted to evaluate the indoor thermal comfort, stratification, IAQ and energy consumption according to the fixed minimum air flow rate of the VAV terminal units. In addition, an algorithm was proposed considering the stratification and variable minimum air flow rate depending on the indoor load. The results of the fixed minimum air flow rate simulation showed that the minimum air flow rate considering stratification satisfies all the conditions of indoor thermal comfort, IAQ and without stratification. The proposed method was found to be more effective than the existing control method. The energy comparison with the existing control method showed that the proposed method reduces the energy consumption.

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Optimal supply air temperature with respect to energy use in a variable air volume system

Cited by 72 publications

References 8 publications

Intake power measurement as a criterion for control of HVAC systems

Intake power measurement as a criterion for control of HVAC systems

Optimization of Office Building Façades in a Warm Summer Continental Climate

A Study on the Control Method Without Stratification of Single Duct VAV Terminal Units

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Optimal supply air temperature with respect to energy use in a variable air volume system

Cited by 72 publications

References 8 publications

Intake power measurement as a criterion for control of HVAC systems

Intake power measurement as a criterion for control of HVAC systems

Optimization of Office Building Fa&#231;ades in a Warm Summer Continental Climate

A Study on the Control Method Without Stratification of Single Duct VAV Terminal Units

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Product

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Optimization of Office Building Façades in a Warm Summer Continental Climate