A case study of ground source direct cooling system integrated with water storage tank system

Liu, Jiying; Xie, Xiaona; Qin, Fenghua; Song, Shoujie; Dong-lan, LV

doi:10.1007/s12273-016-0297-0

Cited by 20 publications

(4 citation statements)

References 18 publications

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“…12 Furthermore, radiant floor systems were mainly investigated for their potential use in heating applications in cold climates, for instance in northern China. 13,14 Radiant cooling systems are capable of removing a large fraction of the sensible cooling load; however, a ventilation system is also required to deal with the remainder of the sensible cooling load and all of the latent cooling load, 15 which includes displacement ventilation (DV), 16 the dedicated outdoor air system 17 and the outdoor infiltration air in residential buildings. 18 Therefore, a dedicated radiant floor cooling system combined with a ventilation system is necessary to provide fresh air and reduce the local discomfort and draught risk at ankle level.…”

Section: Introductionmentioning

confidence: 99%

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A comparison of the thermal comfort performances of a radiation floor cooling system when combined with a range of ventilation systems

Liu

Kim

et al. 2019

Indoor and Built Environment

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This study conducted a series of computational fluid dynamics simulations to evaluate the thermal comfort performance of a radiant floor cooling system when combined with different ventilation systems, including mixed ventilation (MV), stratum ventilation (SV), displacement ventilation (DV) and ductless personalized ventilation (DPV). A window temperature of 32°C and three different floor temperatures including 20, 22 and 24°C were set in summer. We used the vertical air temperature differences (VATD) at ankle and head level, the percentage of dissatisfied, the draught rate at the ankle level and the equivalent temperature as our main evaluation indices. Our results show that the VATD in DV system can reach up to about 5°C, compared with about 2°C in MV and SV systems. For the DPV system, there is only a marginal drop in the VATD. For the DV and DPV cases, with a rate of air changes per hour (ACH) of 2.4−1, we recorded a higher draught rate at the ankle level, ranging from 6.55% to 9.99%. The lower equivalent temperature values for the foot and calf segments occur when the floor temperature is 20°C. In all cases, the equivalent temperature values of the whole body indicate an acceptable level of thermal discomfort.

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Section: Introductionmentioning

confidence: 99%

“…12 Furthermore, radiant floor systems were mainly investigated for their potential use in heating applications in cold climates, for instance in northern China. 13,14…”

Section: Introductionmentioning

confidence: 99%

A comparison of the thermal comfort performances of a radiation floor cooling system when combined with a range of ventilation systems

Liu

Kim

et al. 2019

Indoor and Built Environment

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“…In the last two decades, numerous cities face serious problems of rapid urbanization [1,2], energy consumption [3][4][5][6][7], and climate change [8,9]. It is estimated more than 70% of people will reside in the built environment by 2050.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Impacts of Urban Microclimate on a Building Energy Consumption—A Case Study

et al. 2019

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This paper considered an actual neighborhood to quantify impacts of the local urban microclimate on energy consumption for an academic building in College Park, USA. Specifically, this study accounted for solar irradiances on building and ground surfaces to evaluate impacts of the local convective heat transfer coefficient (CHTC), infiltration rate, and coefficient of performance (COP) on building cooling systems. Using computational fluid dynamics (CFD) allowed for the calculation of local temperature and velocity values and implementation of the local variables in the building energy simulation (BES) model. The discrepancies among the cases with different CHTCs showed slight influence of CHTCs on sensible load, in which the maximum variations existed 1.95% for sensible cooling load and 3.82% for sensible heating load. The COP analyses indicated windward wall and upstream roof are the best locations for the installation of these cooling systems. This study used adjusted infiltration rate values that take into account the local temperature and velocity. The results indicated the annual cooling and heating energy increased by 2.67% and decreased by 2.18%, respectively.

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“…The former is a convection-dominated system, i.e., total volume system ventilation [10], including MV (14 studies), DV (14 studies), and UFAD (8 studies). The latter is radiation-dominated and uses radiant panels [114,128] or a chilled ceiling [116,119]. It should be noted that some PV systems recirculate air in addition to using outside air by utilizing a low-mixing PV nozzle integrated with a four-sided slot diffuser [89,93], as shown in Figure 2c.…”

Section: Pv Types With Background Hvac Systemsmentioning

confidence: 99%

A Review of CFD Analysis Methods for Personalized Ventilation (PV) in Indoor Built Environments

et al. 2019

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Computational fluid dynamics (CFD) is an effective analysis method of personalized ventilation (PV) in indoor built environments. As an increasingly important supplement to experimental and theoretical methods, the quality of CFD simulations must be maintained through an adequately controlled numerical modeling process. CFD numerical data can explain PV performance in terms of inhaled air quality, occupants’ thermal comfort, and building energy savings. Therefore, this paper presents state-of-the-art CFD analyses of PV systems in indoor built environments. The results emphasize the importance of accurate thermal boundary conditions for computational thermal manikins (CTMs) to properly analyze the heat exchange between human body and the microenvironment, including both convective and radiative heat exchange. CFD modeling performance is examined in terms of effectiveness of computational grids, convergence criteria, and validation methods. Additionally, indices of PV performance are suggested as system-performance evaluation criteria. A specific utilization of realistic PV air supply diffuser configurations remains a challenging task for further study. Overall, the adaptable airflow characteristics of a PV air supply provide an opportunity to achieve better thermal comfort with lower energy use based on CFD numerical analyses.

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A case study of ground source direct cooling system integrated with water storage tank system

Cited by 20 publications

References 18 publications

A comparison of the thermal comfort performances of a radiation floor cooling system when combined with a range of ventilation systems

A comparison of the thermal comfort performances of a radiation floor cooling system when combined with a range of ventilation systems

Quantifying Impacts of Urban Microclimate on a Building Energy Consumption—A Case Study

A Review of CFD Analysis Methods for Personalized Ventilation (PV) in Indoor Built Environments

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