Investigation in performance of a hybrid under-floor air distribution with improved desk displacement ventilation system in a small office

Rahmati, Bahram; Heidarian, Ali; Jadidi, Majid

doi:10.1016/j.applthermaleng.2018.03.015

Cited by 35 publications

(6 citation statements)

References 44 publications

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“…Authors do not promote any commercial CFD package, and encourage diverse application of CFD in PV studies, including the open-source OpenFOAM, which has powerful grid capabilities and a wide range of applications [126]. Note that Airpak is no longer updated, but it has been used in recent studies [123].…”

Section: Yearly Publication Distributionmentioning

confidence: 99%

“…To assess the influence of a PV system on thermal comfort, mean skin surface temperature, as an important factor influencing a human's thermal sensation, was employed by calculating Fanger's thermal comfort model parameters and by considering the heat generation and balance for a sleeping person [109,110]. Finally, the commonly used comfort indices-e.g., predicted mean vote (PMV) and predicated percentage of dissatisfaction (PPD), as well as the improvement of overall thermal sensation (DPMV) [107]-were used to examine an occupant's thermal comfort [123]. The impact of PV on CTM thermal comfort is mostly evaluated using the ATC model.…”

Section: Thermal Comfortmentioning

confidence: 99%

“…The direct energy-saving evaluation index mainly accounts for the reduction of cooling loads in the occupied zone using PV devices [96,109,207], or a difference in power consumption of a PV or MV air supply fan due to different flow rates [113]. A cooling load calculation method originally designed for stratified air distribution systems was used [208] by ventilating only the occupied zone and then calculating the cooling energy saving in the coil capacity of DV compared to MV [123]. The coil capacity can be assessed by multiplying the exhaust mass flow rate and the difference between the exhaust temperature and indoor setpoint temperature [111,112].…”

Section: Energy Savingsmentioning

confidence: 99%

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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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Section: Yearly Publication Distributionmentioning

confidence: 99%

Section: Thermal Comfortmentioning

confidence: 99%

Section: Energy Savingsmentioning

confidence: 99%

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

et al. 2019

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“…The first mode concerns detailed indoor airflow modelling with simplified thermal boundary conditions imposed on the room envelope (eg. walls are at a constant temperature [ 18 ], or adiabatic in nature [ 11 ]). Here, the possible impact of heat transfer across the envelope in terms of changes in the indoor airflow cannot be identified.…”

Section: Introductionmentioning

confidence: 99%

Energy performance and indoor airflow analysis of a healthcare ward designed with resource conservation objectives

Saikia

Rakshit

Narayanaswamy

et al. 2021

Journal of Building Engineering

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With the outbreak of COVID-19, the urgency of wide-scale healthcare infrastructure development has been felt globally for human survival. To accommodate a large infected population, copious wards are to be built within the prevalent constraints of land, power and material availability. This study designs a two-bed modular healthcare ward which is shrunk in size to minimize the requirement of space and other construction commodities such as materials, labour and power. Additionally, HVAC energy usage is accounted for conservation. The health safety and thermal comfort of occupants are regulated by monitoring indoor environment attributes while pushing towards a resource-efficient structure. Two popular envelope thermal retrofits viz. phase change material and thermal insulation are tested to conceive gains in terms of improved energy performance of the ward. Various ward designs contest with their energy performance and occupant's health safety and comfort characteristics in a multicriteria decision making process for delivering the most favourable solution. Subsequently, the most suitable solution is offered by a design involving thermal insulation retrofit with 8 ACH fresh air supply rate and 26 °C inlet air temperature. The proposed design can support developing nations to contrive quick response to pandemic outbreaks with reduced construction (cost, time) and energy loads.

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“…The convective and radiative transfer heat from non-airconditioned zone to air-conditioning zone were calculated as an additional cooling load in the lower air-conditioning zone [1][2][3] This method has been widely used for calculating the cooling load of large space buildings. Kang Zhao [4] proposed a new method to calculated the cooling capacity of a radiant floor in the large spaces of an airport, In addition, the theoretical research on stratified airconditioning load in the lower air supply distribution were focused on the stratified height [5], the load efficiency coefficient [6], the lower air supply load correction factor [7], the supply and return air heights, the indoor heat source distribution [8] and outdoor disturbances affect the stratified load.…”

Section: Introductionmentioning

confidence: 99%

A study on stratified air conditioning cooling load calculation model for a large space building

Cai¹,

Zhang²,

Huang³

2018

IJHT

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Based on the theory of regional heat and mass balance, a stratified air-conditioning load calculation model suitable for large-space buildings was established. A test of a large-space building under summer conditions was conducted to verify the calculation results of indoor vertical temperature distribution. The stratified air-conditioning cooling load calculated by the model was compared with the actual air-conditioning cooling capacity. The calculation results showed that the difference between the actual air-conditioning cooling load and the model calculation result was 14%. Based on the model, the vertical temperature distribution under variable operating conditions was predicted.

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Investigation in performance of a hybrid under-floor air distribution with improved desk displacement ventilation system in a small office

Cited by 35 publications

References 44 publications

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

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

Energy performance and indoor airflow analysis of a healthcare ward designed with resource conservation objectives

A study on stratified air conditioning cooling load calculation model for a large space building

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