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Journal ArticleDOI

Simulation of indoor comfort level in a building cooled by a cooling tower–concrete core cooling system under hot–semiarid climatic conditions:

01 Jun 2017-Indoor and Built Environment (SAGE Publications)-Vol. 26, Iss: 5, pp 680-693
TL;DR: In this paper, the authors present the results of computational fluid dynamic analysis of a room cooled by a concrete core cooling system supported by a cooling tower, which is preferred over other passive cooling options due to its better cooling performance in dry regions and its ability to operate all through the day.
Abstract: Concrete core cooling system is an energy efficient alternative to the conventional mechanical cooling system. It provides better comfort due to direct absorption of radiation load, low indoor air velocity, apt vertical temperature gradient and absence of noise. It can be operated at relatively higher water temperature, which facilitates the use of passive cooling strategies. In this study, a cooling tower, which is an ‘evaporative cooling system’, is preferred over other passive cooling options due to its better cooling performance in dry regions and its ability to operate all through the day. This paper presents the results of computational fluid dynamic analysis of a room cooled by concrete core cooling system supported by a cooling tower. The study reveals that for a typical hot–semiarid summer climatic condition in India, the system reduces the average indoor air temperature to a comfortable range of 23.5 to 28℃ from an uncomfortable range of 35.3 to 41℃ in a building without cooling. The average pre...
Citations
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Journal ArticleDOI
TL;DR: In this article, the authors 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 and different ventilation conditions.
Abstract: 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 syst...

34 citations

Journal ArticleDOI
TL;DR: In this paper, a hybrid passive cooling system, in which thermal activated building system (TABS) is integrated with a cooling tower, is proposed to provide thermal comfort in twelve Indian cities spread over five different climatic regions using COMSOL multiphysics.

15 citations

Journal ArticleDOI
TL;DR: In this paper, the thermal behavior of this thermally activated glass fibre reinforced gypsum (TAGFRG) roof is analyzed experimentally in terms of diurnal temperature gradients, thermal images of the interior and exterior roof surfaces, decrement factor and water temperature variations.

12 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the influences of three design parameters on thermal comfort of thermal activated building system (TABS) using COMSOL Multiphysics, a computational fluid dynamics (CFD) tool.
Abstract: Thermally activated building system (TABS) can be operated at relatively higher water temperature. Hence, it can be coupled with passive cooling systems. This paper investigates the influences of three design parameters on thermal comfort of TABS using COMSOL Multiphysics, a computational fluid dynamics (CFD) tool. For the same inlet velocity, an increase in the pipe inner diameter from 9 to 17 mm decreased the operative temperature (OT), a thermal comfort index, by 1.8°C. An increase in the pipe thermal conductivity from 0.14 to 1.4 W/mK reduced the average OT by 2.5°C. However, a further increase in thermal conductivity had no significant influence. For cooling pipes embedded at a constant depth, an increase in the thickness of both roof and floor from 0.1 to 0.2 m delayed and reduced the maximum OT by 48 minutes and 0.3°C, respectively.

11 citations


Cites background or methods from "Simulation of indoor comfort level ..."

  • ...Further details on model validation, mesh independence analysis, numerical techniques used for simulation and comfort indices used for post-processing of results have been presented in an earlier paper by the same authors [19]....

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  • ...Schematic of a cooling tower based TABS [19]....

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Journal ArticleDOI
TL;DR: In this paper, COMSOL Multiphysics, a computable multiphysics (COMSOL) based approach, is used to design a thermal activated building system, which is not only energy efficient but also provides better thermal comfort compared to the conventional cooling systems.
Abstract: Thermally activated building system is not only energy efficient but also provides better thermal comfort compared to the conventional cooling systems. In this paper, COMSOL Multiphysics, a computa...

4 citations


Cites background from "Simulation of indoor comfort level ..."

  • ...5 to 28 C.(17) Very little research is focused on the influence of various parameters on the performance of TABS....

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References
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Journal ArticleDOI
TL;DR: In this article, the authors analyzed available information concerning energy consumption in buildings, and particularly related to HVAC systems, and compared different types of building types and end uses in different countries.

5,288 citations


"Simulation of indoor comfort level ..." refers background in this paper

  • ...In the UK, USA and Spain, air-conditioning accounts for 62%, 53% and 42% of the respective country’s residential sector energy consumption.(6) India is expected to have higher growth in cooling energy demand due to economic growth and the tropical climatic conditions experienced in a major part of the country....

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Book
01 Jan 1972
TL;DR: In this paper, an account of research undertaken by the author and his colleagues at the Technical University of Denmark and at the Institute for Environmental Research, Kansas State University is described. But the data in the literature on thermal comfort are extensive, they are disjointed Other CABI sites 
Abstract: This book is basically an account of research undertaken by the author and his colleagues at the Technical University of Denmark and at the Institute for Environmental Research, Kansas State University. Although the data in the literature on thermal comfort are extensive, they are disjointed Other CABI sites 

3,930 citations


"Simulation of indoor comfort level ..." refers methods in this paper

  • ...The index was developed using experimental data obtained from a controlled environment and the heat flow imbalance between actual and the optimum comfort conditions.(28) Standard 7-point scale ( 3 to+3) has been used to calculate PMV with zero representing thermal neutrality....

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Journal ArticleDOI
TL;DR: In this paper, the potential development of energy use for future residential heating and air conditioning in the context of climate change is assessed and the potential impacts on heating and cooling individually are considerable, particularly in South Asia, where energy demand for residential air conditioning could increase by around 50% due to climate change.

882 citations


"Simulation of indoor comfort level ..." refers background in this paper

  • ...The forecast is that, by 2055, the country’s cooling energy demand will be higher than the USA and China.7 Air-conditioning industry has experienced a rapid growth in the past few decades due to heat island effect in cities, global warming, increase in time spent indoors, aspiration for better living conditions and increased glazing in modern architecture....

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  • ...The forecast is that, by 2055, the country’s cooling energy demand will be higher than the USA and China.(7) Air-conditioning industry has experienced a rapid growth in the past few decades due to heat island effect in cities, global warming, increase in time spent indoors, aspiration for better living conditions and increased glazing in modern architecture....

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Journal ArticleDOI
TL;DR: In this article, a single comprehensive equation is developed for the rate of heat and mass transfer from a circular cylinder in crossflow, covering a complete range of Pr (or Sc) and the entire range of Re for which data are available.
Abstract: A single comprehensive equation is developed for the rate of heat and mass transfer from a circular cylinder in crossflow, covering a complete range of Pr (or Sc) and the entire range of Re for which data are available. This expression is a lower bound (except possibly for RePr < 0.2); free-stream turbulence, end effects, channel blockage, free convection, etc., may increase the rate. In the complete absence of free convection, the theoretical expression of Nakai and Okazaki may be more accurate for RePr < 0.2. The correlating equation is based on theoretical results for the effect of Pr in the laminar boundary layer, and on both theoretical and experimental results for the effect of Re. The process of correlation reveals the need for theoretical results for the effect of Pr in the region of the wake. Additional experimental data for the effect of Pr at small Pe and for the effect of Re during the transition in the point of separation are also needed.

849 citations


"Simulation of indoor comfort level ..." refers methods in this paper

  • ...The Darcy friction factor (fD) in equation (13) can be computed using Churchill friction model.(21) The temperature of domain surrounding the pipe, Text, is the temperature of slab in which it is embedded....

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