Optimal Intermittent Regulation of Tubes-embedded Building Envelope Cooling System

Sui, Xuemin; Wang, Huajiang; Yan, Jian Hua; Guo, Hong Bing

doi:10.1016/j.proeng.2017.10.208

Cited by 6 publications

(3 citation statements)

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“…It can be seen that the cooling surface temperature decreases with the increase of the cooling time but gradually increases after the stop of cooling, due to the presence of indoor heat gains. The surface temperatures of the ceiling and floor vary in the range of 22 to 24 • C on 10 July, which meet the requirements of the Chinese standard 'Technical Specification for Radiant Heating and Cooling' (JGJ 142-2012) [44]. It can also be seen from the figure that the water return temperatures vary within a small range when the water supply temperature is constant.…”

Section: Intermittent Control Analysis and Optimizationsupporting

confidence: 56%

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Thermal Response Characteristics of Intermittently Cooled Room with Tube-Embedded Cooling Slab and Optimization of Intermittent Control

Sui

Wang

et al. 2020

Energies

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The heat storage effect of the tube-embedded slab cooling system (TESCS) makes the intermittent operation feasible, a reasonable intermittent strategy can fully realize the energy saving effect. This paper purposes to optimize the intermittent control schemes for TESCS by simulation. The response of the thermal environment intermittently cooled by TESCS is firstly studied. Then, the intermittent control schemes of TESCS are studied. On the basis of the dual-objective optimization for thermal comfort and energy efficiency, the optimal scheme is established. The results show that the tube-embedded slab has significant heat storage and release characteristics under intermittent cooling condition. Its maximum cooling capacity appears about one hour after the stop of cooling. Reducing the cooling duration can reduce the system energy consumption, but increasing the cooling duration can reduce the system peak load. Twenty-four-hour cooling can reduce the peak load by about 70%, 67%, and 41%, respectively, compared with 6-h, 8-h, and 12-h cooling. The effect of the cooling duration on the thermal comfort and energy efficiency is much greater than the cooling time distribution. Frequent starts and stops of the pump can increase the cooling capacity obtained by the room to a certain extent. Daytime cooling provides higher comfort and energy efficiency while night cooling can reduce the chiller’s peak cooling requirement by about 25%.

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Section: Intermittent Control Analysis and Optimizationsupporting

confidence: 56%

“…In this study, a typical office block in Xi'an, a typical city representative of a cold zone in China was chosen to be the case study [44]. The studied building has three stories and a shape coefficient smaller than 0.3.…”

Section: Building and System Simulation Modelmentioning

confidence: 99%

Thermal Response Characteristics of Intermittently Cooled Room with Tube-Embedded Cooling Slab and Optimization of Intermittent Control

Sui

Wang

et al. 2020

Energies

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“…Hu et al [12] found that radiant cooling system conserved cooling energy in unoccupied period to balance 9-15% of indoor heat gain in occupied period, and the peak sensible cooling loads of the radiant terminal decreased by 32-39% compared with those using conventional scheduling. Sui et al [13] observed that increasing the start and stop frequency of the pump during a given cooling period increased the cooling capacity of a tubes-embedded envelope cooling system. Liu et al [14] proposed intermittent controls based on the minimum outdoor air temperature and the average water supply and return temperature via CFD simulation Tang et al [15] proposed a novel pulse flow control method that allowed for a 27% reduction of the supply water flow at 50% load operation, and it made the radiant surface temperature distribution more uniform with more accurate control.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the dynamic thermal response of a radiant floor system in an office building

Ren

Zhao

et al. 2021

E3S Web Conf.

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The dynamic thermal performance of radiant terminal plays an important role in the design and control of radiant cooling system, which is shown as the dynamic thermal response of radiant floor system (RFS) under imposed control. In this paper, the field measurement method was used to study the dynamic thermal response of RFS. The RFS was activated in summer and the supply water temperature was regulated in winter to make dynamic change of thermal performance. The floor surface temperature was selected as the characteristic parameter to describe the dynamic heat transfer performance of the system, and response time τ95 and time constant τ63 were used to quantify the dynamic thermal response. The maximum τ95 was 13.5 h and τ95/τ63 was greater than or equal to 2 in the cooling mode, while τ95 and τ63 were both less than 10 h and τ95/τ63 was 1.6 in the heating mode. As a result, there was no significant lessening of temperature change rate, and the thermal response of RFS was faster under intermittent control of supply water temperature in winter. Therefore, the study aims at providing reference for making intermittent control strategy by using the dynamic thermal performance of radiant system.

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Improved energy management technique in pipe-embedded wall heating/cooling system in residential buildings

2019

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Optimal Intermittent Regulation of Tubes-embedded Building Envelope Cooling System

Cited by 6 publications

References 1 publication

Thermal Response Characteristics of Intermittently Cooled Room with Tube-Embedded Cooling Slab and Optimization of Intermittent Control

Thermal Response Characteristics of Intermittently Cooled Room with Tube-Embedded Cooling Slab and Optimization of Intermittent Control

Experimental study on the dynamic thermal response of a radiant floor system in an office building

Improved energy management technique in pipe-embedded wall heating/cooling system in residential buildings

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