An experimental study of mixed convection over various thermal activation lengths of vertical TABS

Venko, Samo; Pavlovic, E.; Vidrih, Boris; Arkar, Ciril; Medved, Sašo

doi:10.1016/j.enbuild.2014.08.036

Cited by 6 publications

(7 citation statements)

References 22 publications

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“…The results demonstrated that radiant walls had better synergy with the building insulation. On the experimental side, Venko et al [30] made a laboratory study on the activation length of a VTABS under mixed convection conditions. Despite all these research, the literature found did not include experimental test of VTABS on real outdoor conditions, which is valuable information to evaluate the potential of such systems and validate simulation models with real data.…”

Section: Introductionmentioning

confidence: 99%

“…The cubicles built allowed for a comparative study of buildings with equivalent envelopes but using different HVAC systems, in that case a radiant wall coupled to a ground heat exchanger on a side and a conventional air-to-air heat pump on the other. Furthermore, the studied radiant wall was embedded into a heavy brick wall, which contrasts to previous studies were the system was embedded in concrete [22,26] or radiant wall panels were used [29,30].…”

Section: Introductionmentioning

confidence: 99%

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Experimental evaluation of a cooling radiant wall coupled to a ground heat exchanger

Romaní

Pérez

Gracia

2016

Energy and Buildings

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A building prototype was built in the experimental setup located in Puigverd de Lleida (Spain) to study the energy performance of a radiant wall with ventilated facade cooled with a ground coupled heat-exchanger. The installed geothermal heat pump operates only as a ground coupled heat exchanger on cooling mode, thus providing free-cooling. In this case, only the circulation pumps consume power. The summer experimental campaign showed the energy savings potential and the peak load shifting ability of the system. On continuous operation and taking as reference a cubicle equipped with a conventional air-to-air heat pump, the radiant wall cooled with the ground coupled heat-exchanger achieved savings up to 54.17% and 82.08% at set-point temperatures of 24 ºC and 26 ºC, respectively. The thermal storage capacity of the system was studied in night charging test, when the cubicles were pre-cooled during night-time. During the day, the temperature raise caused by heat loads was small and the system kept the temperature inside comfort range despite it only operated overnight. However, the performance was very sensitive to set-point temperature. Free-cooling was limited by the temperatures in the boreholes, showing that with lower set-points the gradient between supply temperature and room temperature was small, and thus it required a higher water flow to achieve the necessary cooling power. Intermittent operation of the system according to different schedules also affected the radiant walls performance as they interacted with the thermal inertia of the system, which could even have a negative impact on energy use.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of a cooling radiant wall coupled to a ground heat exchanger

Romaní

Pérez

Gracia

2016

Energy and Buildings

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“…Since the large areas involved in such systems ensure the exchange of considerable amounts of heat across narrow temperature gradients, they are potentially compatible with energy sources at low temperature [16]. Most of the drawbacks to TABS designs, attributable to the low convectiondriven heat exchange between the surface and the conditioned space, can be circumvented by integrating TABS into ventilation systems [17,18].…”

Section: Thermally Activated Building Systems (Tabs)mentioning

confidence: 99%

Building thermal storage technology: Compensating renewable energy fluctuations

Delgado

Ramos

Domínguez

et al. 2020

Journal of Energy Storage

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“…Aside from simulation research, Venko et al [27] made a laboratory experimental study. The focus was on the convective part of the radiant panels, studying the activation length of vertical TABS on mixed convection conditions.…”

mentioning

confidence: 99%

“…The study was based on system vs. system comparison, the cubicles built allowed for a comparative study of buildings with equivalent envelopes but using different HVAC systems and distribution system, in that case a radiant wall coupled to a GSHP on a side and a conventional air-to-air heat pump on the other. The studied radiant wall differs from other VTABS found on the literature, as most radiant systems are embedded into concrete [13,23] or made of radiant panels [26,27] while the cubicle built for this study had the radiant system embedded into a heavy brick wall. The present experimental study pretends to demonstrate the energy savings potential of the system as well as its peak load shifting ability.…”

mentioning

confidence: 99%

Experimental evaluation of a heating radiant wall coupled to a ground source heat pump

2017

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A radiant wall heating system embedded in a heavy brickwork envelope and coupled to a ground source heat pump supplied has been experimentally tested under real outdoor conditions. This system was applied to a room sized cubicle built in Puigverd de Lleida (Spain) test-site, where it was studied in system vs. system analysis in comparison to a reference cubicle built with commercial available technologies (insulated alveolar brick wall and air-to-air heat pump). The results showed the potential of the radiant wall, which in continuous operation reached energy savings between 19.97 % and 40.72 % based on set-point temperature. Most important, the active thermal mass of radiant wall allowed operating in off peak periods. Otherwise, this peak load shifting ability was completely inexistent in the reference cubicle. However, the results show that the radiant cubicle was unsuited to operate in occupancy schedules due to its slow response time. Furthermore, the tests show that optimization of the radiant wall system requires a control strategy that takes in account the dynamics of the system.

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An experimental study of mixed convection over various thermal activation lengths of vertical TABS

Cited by 6 publications

References 22 publications

Experimental evaluation of a cooling radiant wall coupled to a ground heat exchanger

Experimental evaluation of a cooling radiant wall coupled to a ground heat exchanger

Building thermal storage technology: Compensating renewable energy fluctuations

Experimental evaluation of a heating radiant wall coupled to a ground source heat pump

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