Experimental and numerical investigation on thermal performance of data center via fan-wall free cooling technology

Jiang, Lan; Zhang, Zujing; Liang, Xin-Gang; Wu, Hongwei; Wang, Gang; Mao, Ruiyong

doi:10.1016/j.applthermaleng.2023.120467

Applied Thermal Engineering

2023

DOI: 10.1016/j.applthermaleng.2023.120467

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Experimental and numerical investigation on thermal performance of data center via fan-wall free cooling technology

Lan Jiang

Zujing Zhang

Xin-Gang Liang

et al.

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Cited by 12 publications

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“…During the dynamic adjustment of room temperature, variations in air supply volume within the air-conditioned space induce temperature changes [26]. Assuming the room temperature was stable and matched the preset value before the current moment, the current temperature shift can be regarded as the variance between the current room temperature and its set value.…”

mentioning

confidence: 99%

Optimization of Double-Closed-Loop Control of Variable-Air-Volume Air-Conditioning System Based on Dynamic Response Model

Li,

Ahmat,

Cao

et al. 2024

Buildings

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Control strategies for variable-air-volume (VAV) air conditioning significantly affect both the air quality within buildings and the consumption of building energy. Current control techniques effectively regulate room temperature using feedback on temperature discrepancies, yet they also elevate the wear on terminal devices and boost the energy usage of the supply fan. In this paper, the hysteresis and inertia parameters of end air valves and supply fans under two seasonal conditions are derived from experimental data. Aiming at the problems of frequent switching of the end air valve, long total switching stroke, and high energy consumption of the air supply fan, a fuzzy PI regulation method is proposed based on the original pressure-independent series PI regulation, which effectively solves the above problems. Initially, data on how room temperature reacts to changes in air supply fan speed and the position of end air valves during winter and summer were gathered. Following model identification, parameters for various seasonal conditions were determined. Secondly, the roles of different components in the variable-air-volume regulation process were investigated. Investigations revealed that within pressure-independent variable-air-volume control, the supply fan and end air valve emerged as the primary subjects of the study. A double-closed-loop control with the speed control of the supply fan as the outer loop and the opening control of the end air valve as the inner loop was adopted. Compared with the traditional serial PI regulation, the room temperature error of this method was increased, but it reduced the total stroke of the valve by more than 43%, which greatly reduced the valve’s loss and noise and saved more than 2.7% of the energy consumption of the air supply fan.

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confidence: 99%

Optimization of Double-Closed-Loop Control of Variable-Air-Volume Air-Conditioning System Based on Dynamic Response Model

Li,

Ahmat,

Cao

et al. 2024

Buildings

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Radiative free cooling for energy and water saving in data centers

Aili,

Long,

Cao

et al. 2024

Applied Energy

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Optimization air-conditioning system and thermal management of data center via fan-wall free cooling technology

Zhang

Mao

et al. 2023

Applied Thermal Engineering

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Experimental and numerical investigation on thermal performance of data center via fan-wall free cooling technology

Cited by 12 publications

References 50 publications

Optimization of Double-Closed-Loop Control of Variable-Air-Volume Air-Conditioning System Based on Dynamic Response Model

Optimization of Double-Closed-Loop Control of Variable-Air-Volume Air-Conditioning System Based on Dynamic Response Model

Radiative free cooling for energy and water saving in data centers

Optimization air-conditioning system and thermal management of data center via fan-wall free cooling technology

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