On the understanding of the mean radiant temperature within both the indoor and outdoor environment, a critical review

Guo, Hu; Aviv, Dorit; Loyola, Mauricio; Teitelbaum, Eric; Houchois, Nicholas; Meggers, Forrest

doi:10.1016/j.rser.2019.06.014

Cited by 96 publications

(40 citation statements)

References 77 publications

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“…There are also software packages for integrated simulation of heat and airflow in-such as ESP-r [51], TRNSYS with TRNFLOW module [52] or IDA-ICE [53]. These programs are also based on the heat balance including, for example, mean radiant temperature [54].…”

Section: Diagnostics Of Natural Ventilation Systemsmentioning

confidence: 99%

Thermal Diagnostics of Natural Ventilation in Buildings: An Integrated Approach

Ferdyn-Grygierek¹,

Baranowski²,

Błaszczok³

et al. 2019

Energies

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Diagnostics of natural ventilation in buildings is problematic, as the airflow rate changes considerably over time. One constant average airflow is usually assumed when calculating energy demand for a building, however, such a simplification could be fraught with considerable error. The paper describes a comprehensive methodology for the diagnostics of a natural ventilation system in a building and its practical application. Based on in situ measurements and simulations in two existing buildings (dwelling house and school) in Poland, the real values of the ventilating airflows were analyzed and resulting heat demand was compared with the design values. The pros and cons of various methods for evaluation of natural ventilation are discussed. The real airflow was determined by measurements in a ventilation grille or by a tracer gas concentration decay method. The airtightness of the buildings’ envelope was evaluated based on the fan pressurization test. The last stage entailed computer simulations of air exchange in buildings using CONTAM software. The multizone models of the buildings were calibrated and verified with existing measured data. Measured airflow in a multifamily house was small and substantially deviated from the Polish standard. In case of a school, the air flow rate amounted to an average of 10% of the required value. Calculation of the heat demand for ventilation based on the standard value of the airflow led to a considerable overestimation of this value in relation to the real consumption. In the analyzed cases, the difference was 40% for the school and 30% for the residential building.

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Section: Diagnostics Of Natural Ventilation Systemsmentioning

confidence: 99%

Thermal Diagnostics of Natural Ventilation in Buildings: An Integrated Approach

Ferdyn-Grygierek¹,

Baranowski²,

Błaszczok³

et al. 2019

Energies

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“…In addition, and as a distinguished example from many related studies (discussed later in this section), the work undertaken by Lin, Tsai, Hwang and Matzarakis [66] presented important outputs pertaining to crucial relationships with microclimatic variables such as Mean Radiant Temperature (MRT) and Sky View Factor (SVF) ratios. Regarding these two aspects, and although the former two studies in Table 1 do not categorically refer to the comparison of thermal indices, both present noteworthy contemporary reviews regarding the calculation methods of: (i) MRT in indoor and outdoor environments through different applicative algorithms and models [76]; (ii) SVF through a diverse range of reviewed methodologies and software packages, moreover highlighting their respective weaknesses and strengthens within local microclimatic assessments and linkage with urban planning processes and decision making [77].…”

Section: Thermo-physiological and Climatic Indicesmentioning

confidence: 99%

The Maturing Interdisciplinary Relationship between Human Biometeorological Aspects and Local Adaptation Processes: An Encompassing Overview

Nouri

Matzarakis

2019

Climate

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To date, top-down approaches have played a fundamental role in expanding the comprehension of both existing, and future, climatological patterns. In liaison, the focus attributed to climatic mitigation has shifted towards the identification of how climatic adaptation can specifically prepare for an era prone to further climatological aggravations. Within this review study, the progress and growing opportunities for the interdisciplinary integration of human biometeorological aspects within existing and future local adaptation efforts are assessed. This encompassing assessment of the existing literature likewise scrutinises existing scientific hurdles in approaching existing/future human thermal wellbeing in local urban contexts. The respective hurdles are subsequently framed into new research opportunities concerning human biometeorology and its increasing interdisciplinary significance in multifaceted urban thermal adaptation processes. It is here where the assembly and solidification of ‘scientific bridges’ are acknowledged within the multifaceted ambition to ensuring a responsive, safe and thermally comfortable urban environment. Amongst other aspects, this review study deliberates upon numerous scientific interferences that must be strengthened, inclusively between the: (i) climatic assessments of both top-down and bottom-up approaches to local human thermal wellbeing; (ii) rooted associations between qualitative and quantitative aspects of thermal comfort in both outdoor and indoor environments; and (iii) efficiency and easy-to-understand communication with non-climatic experts that play an equally fundamental role in consolidating effective adaptation responses in an era of climate change.

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“…As stressed in two recent investigations [25,28], over the past years many studies have been carried out on the mean radiant temperature and globe thermometers [25,29,30]. The most debated issues were the effect of materials on the accuracy [31][32][33][34][35][36], its response time which seems to be acceptable for continuous monitoring only for table tennis balls [20,25,28,32,[36][37][38], and, finally, the correction factors of small globes in case of WBGT measurements [28,[39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Mean Radiant Temperature Measurements through Small Black Globes under Forced Convection Conditions

et al. 2021

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One of the most critical variables in the field of thermal comfort measurements is the mean radiant temperature which is typically measured with a standard 150 mm black globe thermometer. This is also the reference instrument required for the assessment of heat stress conditions by means of the well-known Wet Bulb Globe Temperature index (WBGT). However, one of the limitations of this method is represented by the relatively long response time. This is why in recent years there has been a more and more pressing need of smart sensors for controlling Heating Ventilation and Air Conditioning (HVAC) systems, and for pocket heat stress meters (e.g., WBGT meters provided with table tennis balls). Although it is widely agreed that there is a clear advantage of small probes in terms of response times, their accuracy is a still a debated matter and no systematic studies aimed at metrologically characterizing their performances are actually available, due to the difficulty of reproducing measuring conditions such as a black enclosure at uniform temperature. In this paper the results of a metrological analysis of two small globes (38 and 50 mm diameter) carried out by means of an experimental apparatus specifically designed to reproduce a black uniform enclosure are presented and discussed. Experimental results revealed a systematic underestimation of the mean radiant temperature predicted by small globes of more than 10 °C in forced convection and at high radiative loads.

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On the understanding of the mean radiant temperature within both the indoor and outdoor environment, a critical review

Cited by 96 publications

References 77 publications

Thermal Diagnostics of Natural Ventilation in Buildings: An Integrated Approach

Thermal Diagnostics of Natural Ventilation in Buildings: An Integrated Approach

The Maturing Interdisciplinary Relationship between Human Biometeorological Aspects and Local Adaptation Processes: An Encompassing Overview

Mean Radiant Temperature Measurements through Small Black Globes under Forced Convection Conditions

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