Designing a PCM storage system using the effectiveness-number of transfer units method in low energy cooling of buildings

Tay, N.H.S.; Belusko, Martin; Bruno, Frank

doi:10.1016/j.enbuild.2012.03.041

Cited by 88 publications

(39 citation statements)

References 38 publications

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“…This method was used to define the actual heat transfer that can be derived from a specific design at a specific fraction of phase change [16,17], or the average heat transfer across the phase change process [18,19]. The NTU is a function of the total thermal resistance between the phase change front and the heat transfer fluid, and this resistance can be expressed in terms of the phase change fraction.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

2015

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Section: Introductionmentioning

confidence: 99%

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

2015

Self Cite

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“…In addition, if we consider running in cool mode where supply air temperature is limited to dew point, it not only provides us with energy savings compared to other forced air, radiant and convective systems, but allows achieving powers of 75-90 W/m 2 in cooling mode, which other radiant systems cannot reach. Therefore, it has advantages over chilled beams systems [32,33], passive phase change materials systems (PCMs) applied in natural ventilation slabs at night phase [5,34], displacement diffusion or UFAD (underfloor air diffusion) systems or drive of large air flows at low speed systems. The comparison with chilled beam systems is interesting.…”

Section: Water As a Medium For Transporting Energymentioning

confidence: 99%

Thermal Ceramic Panels and Passive Systems in Mediterranean Housing: Energy Savings and Environmental Impacts

Echarri

2017

Sustainability

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This research examines the benefits of designing a living space in a basement, as a method of passive temperature control in summer, combined with thermal ceramic panels (TCP) on some walls. These panels incorporate a capillary system of polypropylene tubes which work with cold water. We studied a detached house on the coast of Alicante, where the moderate temperature of the ground tempered interior conditions of comfort using the flow of air from the basement, significantly reducing energy demand and environmental impacts. This reduction was quantified through simulations using the Design Builder tool, having previously monitored the state of the building, on scenarios of a house without a basement, a house with a basement and an all-air system, and a house with a basement and radiant surfaces, using TCP panels on walls. This latter passive system led to a 10.25% reduction in annual energy demand. When we combined it with the two possible air conditioning systems, comfort achieved using the TCP panel system improved by 45.8% compared to the all air system in the living room on the ground floor and by 17% in the basement living room. In addition, annual energy demand and environmental impacts deriving from the use of the installation decreased by 31.8% with the TCP system.

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“…A mesh independence study was performed in order to determine the appropriate size of elements to use, providing an accurate mesh independent solution and limiting the overall calculation time. To this end, two meshes were compared using 16 Figure 3 shows the average PCM temperature and the heat transfer rate as a function of time, for the two selected meshes, in the case of 6 cm channel size, 1 m/s inlet velocity, and 70 °C inlet temperature. It can be observed that the average PCM temperature profiles are almost overlapping for the two meshes, whereas the heat transfer rate obtained with the largest element number (Mesh 2) is slightly lower compared to the one resulting from Mesh 1.…”

Section: Mesh Sensitivity Studymentioning

confidence: 99%

“…These studies cover different heat exchanger configurations: parallel PCMs slabs with rectangular air flow channels in-between [1][2][3][4][5][6][7][8][9][10][11]; cross-flow heat exchangers where one [12] or multiple PCMs [13] filled tubes and air is driven across the tubes bank; single [14] or modular [15,16] heat exchangers based on a shell and tubes design where the PCM is on the shell side and air is flowing either across the cylinder containing the PCM or through the tubes; and a cylindrical reactor where air passes through packed layers of spherical PCM capsules [17].…”

Section: Introductionmentioning

confidence: 99%

Numerical study of a PCM-air heat exchanger's thermal performance

Herbinger

Bhouri

Groulx

2016

J. Phys.: Conf. Ser.

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-Design of Experiments applied to numerical simulations: the study case of a PCM-air heat exchanger for temperature maintenance in rooms P Dolado, A Lazaro, J M Marin et al. Abstract. In this paper, the use of PCMs in HVAC applications is investigated by studying numerically the thermal performance of a PCM-air heat exchanger. The PCM used in this study is dodecanoic acid. A symmetric 3D model, incorporating conductive and convective heat transfer (air only) as well as laminar flow, was created in COMSOL Multiphysics 5.0. Simulations examined the dependence of the heat transfer rate on the temperature and velocity of the incoming air as well as the size of the channels in the heat exchanger. Results indicated that small channels size lead to a higher heat transfer rates. A similar trend was also obtained for high incoming air temperature, whereas the heat transfer rate was less sensitive to the incoming air velocity. IntroductionSeveral studies of phase change material (PCM) -air heat exchanger designs for thermal energy storage in heating ventilation and air conditioning (HVAC) systems are found in the literature. These studies cover different heat exchanger configurations: parallel PCMs slabs with rectangular air flow channels in-between [1-11]; cross-flow heat exchangers where one [12] or multiple PCMs [13] filled tubes and air is driven across the tubes bank; single [14] or modular [15,16] heat exchangers based on a shell and tubes design where the PCM is on the shell side and air is flowing either across the cylinder containing the PCM or through the tubes; and a cylindrical reactor where air passes through packed layers of spherical PCM capsules [17].Among these various heat exchanger geometries, the one with PCM slabs and air gaps is the most studied for thermal energy storage in building ventilation systems. It has been the subject of intensive experimental development where real-scale prototypes have been built and tested [2,5,6,9], and the results have been used to validate numerical analysis [5][6][7]9] for further optimization of the heat storage system.In this paper, a PCM-air heat exchanger configuration inspired in part from this previous work was modelled. However, a cellular structure where cubic PCM and air channels were alternated was considered. This configuration was adapted from the air-to-air heat exchanger design, typically used in heat recovery ventilation systems [18]. The main objective was to assess the thermal performance of such a heat exchanger design as a function of its geometrical properties and its operating conditions; the thermal performance in this case being centred on the heat transfer rates since most storage applications using PCM are facing a "rate problem", i.e. heat transfer rates too low for the system to be fully optimised [19]. To this end, a three-dimensional numerical model taking into account heat transfer by

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Designing a PCM storage system using the effectiveness-number of transfer units method in low energy cooling of buildings

Cited by 88 publications

References 38 publications

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

Thermal Ceramic Panels and Passive Systems in Mediterranean Housing: Energy Savings and Environmental Impacts

Numerical study of a PCM-air heat exchanger's thermal performance

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