Experimental analysis of emission efficiency of parallel and serial connected radiators in EN442 test chamber

Võsa, Karl-Villem; Ferrantelli, Andrea; Kull, Tuule Mall; Kurnitski, Jarek

doi:10.1016/j.applthermaleng.2017.12.109

Cited by 19 publications

(12 citation statements)

References 16 publications

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“…In the following, we accordingly determine for specific product categories the experimental input and model calibration data that will be used in dynamic These emitter types are coupled with ON/OFF-and PI-type controllers for heat output regulation (see e.g. [6] for a detailed description). The measurements were carried out in two different rooms within the test facility -a smaller 10 m 2 room R5 (Radiator, UFH, radiant ceiling panels) and a larger 30 m 2 room R9 (Radiator, UFH, air heater).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of radiator, underfloor, ceiling and air heater systems heat emission performance in TUT nZEB test facility

2019

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This paper reports the results of different heat emitter system measurements, which were carried out at the nZEB test facility near Tallinn University of Technology in early 2018. Radiators, underfloor heating, air heaters and radiant ceiling panels are studied as coupled with different control schemes ranging from ON-OFF to PI-type control. The objective is to assess and quantify the control accuracy and thermal comfort parameters among different configurations. Scheduled heating dummies are used to simulate internal heat gains within the otherwise unoccupied test rooms. Along with outdoor temperature variation, the heating demand is therefore constantly changing and the control systems are continuously adjusting the heat output to maintain the desired indoor air temperatures. Control accuracy is then determined from the temperature deviations against this set value. Air stratification within the room is assessed with vertical temperature gradient calculations from measured air temperatures at different heights. The operative temperature at the point of expected occupancy is calculated from surrounding air and enclosing surface temperatures. The quantified results provide a comprehensive comparison between the different system configurations, enabling further energy simulations in related software packages since these parameters directly influence the energy usage within a system.

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Section: Introductionmentioning

confidence: 99%

Experimental study of radiator, underfloor, ceiling and air heater systems heat emission performance in TUT nZEB test facility

2019

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“…Such devices can be of very different type (panel radiators, convectors, ceiling and underfloor heating...), each determining the energy demand in a specific way [4][5][6][7][8]. For these reasons, several studies have investigated the emitters performance on both the experimental and theoretical viewpoint [9][10][11], focusing especially on the design, specific type and room placement of panel radiators (e.g. close to a window or slightly detached from a wall) [4,[12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…close to a window or slightly detached from a wall) [4,[12][13][14][15][16][17][18]. For instance, measurements have shown a better performance of low temperature panel radiators [19], and a sensibly different outcome for serial and parallel connected radiators [9].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, since heating consumption is nowadays assessed in function of thermal comfort, the so-called operative temperature (op.t.) t op is being increasingly used [9,13,18,20]. This is defined as the uniform temperature of an enclosure in which an occupant would exchange the same amount of heat by radiation and convection as in the existing non-uniform environment [21].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Radiators, Underfloor and Ceiling Heating towards the Definition of a Reference Ideal Heater for Energy Efficient Buildings

Ferrantelli¹,

Võsa²,

Kurnitski³

2018

Preprint

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Heat emitters constitute the primary devices used in space heating and cover a fundamental role in the energy efficient use of buildings. In the search for an optimized design, heating devices should be compared with a benchmark emitter with maximum heat emission efficiency. However, such an ideal heater still needs to be defined. In this paper we perform an analysis of heat transfer in a European reference room, considering room side effects of thermal radiation and computing the induced operative temperature both analytically and numerically. By means of functional optimization, we analyse trends such as the variation of operative temperature with radiator panel dimensions, finding optimal configurations. In order to make our definitions as general as possible, we address panel radiators, convectors, underfloor (UFH) and ceiling heating. We obtain analytical formulas for the operative temperature induced by panel radiators and identify the 10-type as our ideal radiator, while the UFH provides the best performance overall. Regarding specifically UFH and ceiling heaters, we find optimal sizes that identify the according ideal emitters. The analytical method and quantitative results reported in this paper can be generalized and adopted in most studies concerning the efficiency of different heat emitter types in building enclosures.

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“…Thermal comfort within an enclosure can be quantified with the so-called operative temperature (hereinafter op.t. or t op ), which is finding an increasing use recently [9,13,18,24]. This is defined as the uniform temperature of an enclosure in which an occupant would exchange the same amount of heat by radiation and convection as in the existing non-uniform environment [25].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Radiators, Underfloor and Ceiling Heater Towards the Definition of a Reference Ideal Heater for Energy Efficient Buildings

Ferrantelli¹,

Võsa²,

Kurnitski³

2018

Preprint

Self Cite

View full text Add to dashboard Cite

Heat emitters constitute the primary devices used in space heating and cover a fundamental role in the energy efficient use of buildings. In the search for an optimized design, heating devices should be compared with a benchmark emitter with maximum heat emission efficiency. However, such an ideal heater still needs to be defined. In this paper we perform an analysis of heat transfer in a European reference room, considering room side effects of thermal radiation and computing the induced operative temperature both analytically and numerically. By means of functional optimization, we analyse trends such as the variation of operative temperature with radiator panel dimensions, finding optimal configurations. In order to make our definitions as general as possible, we address panel radiators, convectors, underfloor (UFH) and ceiling heater. We obtain analytical formulas for the operative temperature induced by panel radiators and identify the 10-type as our ideal radiator, while the UFH provides the best performance overall. Regarding specifically UFH and ceiling heaters, we find optimal sizes that identify the according ideal emitters. The analytical method and quantitative results reported in this paper can be generalized and adopted in most studies concerning the efficiency of different heat emitter types in building enclosures.

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Experimental analysis of emission efficiency of parallel and serial connected radiators in EN442 test chamber

Cited by 19 publications

References 16 publications

Experimental study of radiator, underfloor, ceiling and air heater systems heat emission performance in TUT nZEB test facility

Experimental study of radiator, underfloor, ceiling and air heater systems heat emission performance in TUT nZEB test facility

Optimization of Radiators, Underfloor and Ceiling Heating towards the Definition of a Reference Ideal Heater for Energy Efficient Buildings

Optimization of Radiators, Underfloor and Ceiling Heater Towards the Definition of a Reference Ideal Heater for Energy Efficient Buildings

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