Vehicular thermal comfort models; a comprehensive review

Alahmer, Ali; Mayyas, Ahmed; Mayyas, Abed Alraoof; Omar, Mohammed; Shan, Dongri

doi:10.1016/j.applthermaleng.2010.12.004

Cited by 105 publications

(50 citation statements)

References 28 publications

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“…Among published literature on cabin thermal models, 3D CFD models or lumped-parameter models have been developed [3]. 3D models are employed to analyse in detail thermal comfort aspects, while lumped-parameter models are more appropriate for the integration of the cabin model with the AC system or a control system.…”

Section: Introductionmentioning

confidence: 99%

Transient thermal model of a vehicle's cabin validated under variable ambient conditions

Torregrosa-Jaime

Bjurling

Corberán

et al. 2015

Applied Thermal Engineering

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This paper presents a lumped-parameter thermal model of the passengers' compartment of a vehicle. The model is completely dynamic and has been thoroughly validated under variable ambient conditions including solar radiation. The proposed model reproduces accurately the warm-up and cool-down of the cabin and can help analyse capacity reduction actions for air-conditioning systems.In this study, the thermal loads have been calculated by means of the model. For the tested minibus in real outdoor conditions, air renewal represents from 7% up to 53% of the thermal load, while the solar radiation accounts for 18% to 31%. According to the results, a decrease of 0.2 in the glazing transmissivity can lead to a 3.3% reduction of the installed cooling capacity.

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Section: Introductionmentioning

confidence: 99%

Transient thermal model of a vehicle's cabin validated under variable ambient conditions

Torregrosa-Jaime

Bjurling

Corberán

et al. 2015

Applied Thermal Engineering

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“…According to Gellerstedt (2002), 4,000 control inputs per hour have to be carried out by the operator, due to the lack of automatic functions of the boom and harvester head. Despite the ergonomic design of the cabs, the operators of mobile machinery are exposed mainly to noise (Hansson 1990;Axelsson 1998;Marsili et al 1998;Nieuwenhuis, Lyons 2002;Messingerová et al 2005;Sümer 2006;Beuk et al 2007;Gerasimov, Sokolov 2009;Aybek et al 2010;Bilski 2013), whole-body vibrations (Boileau, Rakheja 1990;Burdorf, Swuste 1993;Magnusson et al 1993;Hansson 1995;Huston et al 1999;Hinz et al 2002;Paddan, Griffin 2002;Hostens, Ramon 2003;Chen et al 2003;Sherwin et al 2004a,b;Deprez et al 2005;Kolich et al 2005;Tiemessen et al 2007;Li et al 2008;Gerasimov, Sokolov 2009), microclimatic conditions -mostly temperature, and airflow velocity inside the cab (Gao, Niu 2004;Kaynakli, Kilic 2005;Huang et al 2006;Mezrhab, Bouzidi 2006;Cengiz, Babalik 2007;Farzaneh, Tootoonchi 2008;Kim et al 2009;Zhang et al 2009a,b;Alahmer et al 2011), and severe mental and sensory load (Axelsson, Pontén 1990;Poschen 1993;…”

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confidence: 99%

Objective and subjective assessment of selected factors of the work environment of forest harvesters and forwarders

Martin¹,

Messingerová²,

Ferenčík³

et al. 2016

J. For. Sci.

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This article was aimed at assessment of selected factors of the work environment, which influenced the operators of harvesters and forwarders. The selection of the work environment factors was based on a thorough literature survey. From the survey exposure to whole-body vibrations, noise (equivalent and peak), microclimatic conditions and mental load were selected for detailed observations. The measurements were conducted according to international standards and assessed according to European or national legislation. Subjective assessment of the effects of the work environment was conducted through a structured interview. The exposure to whole-body vibrations was 0.5 m·s -2 . The equivalent noise exposure was 78 dB, peak noise exposure was 130 dB. The average temperature inside the machine cabs was 17.9°C and average airflow velocity was 0.06 m·s -2 . Mental load was high according to the Meister questionnaire, three operators considered the load inadequate, two considered it adequate. Subjective assessment showed that operators considered other factors to be light or no load.Keywords: noise exposure; whole-body vibrations; microclimate; mental load Work environment is a set of all conditions in which workers carry out their work. It consists of all workers and factors present at the workplace, or of those who have to do with the work and influence the health or comfort of workers. The worker is exposed to many harmful factors which interact and their joint effect can be synergistic or complementary (Schwartz et al. 2013).Operators of multi-operational machinery carry out their tasks in ergonomically designed cabs capable of partial attenuation of noise and vibrations caused by the machine movement, driving gear, and working parts of the machine. Cabs are also equipped with air conditioning and glare reducing windows. Some factors (e.g. electromagnetic, ionising radiation, various chemical factors, or energy expenditure) do not apply to the jobs of multioperational machinery operators. Their assessment would only consume time with no significant effect on the overall outcome of the assessment. The nature of work in mechanized logging partially shifted from physical to mental after employment of multi-operational machinery. The need for muscular activity decreased and the need to stay concentrated and alert through long periods grew in importance. Harvester operators have to be able to process a lot of information, react quickly, and retain their concentration in monotonous, repetitive operations (Axelsson, Pontén 1990;Poschen 1993;Gellerstedt 1997;Gellestedt et al. 1999;Tsioras 2012). Operating the machines is quite demanding. According to Gellerstedt (2002), 4,000 control inputs per hour have to be carried out by the operator, due to the lack of automatic functions of the boom and harvester head. Despite the ergonomic design of the cabs, the operators of mobile machinery are exposed mainly to noise (Hans-

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“…The thermal comfort model discussed in this work can be used to answer the questions concerning the effects of the environmental conditions on the range of electric vehicles, the requirements resulting from local climatic conditions, and the influence of air pre-conditioning to achieve the required comfort conditions before the journey on the vehicle range. The effects of changes in the relative humidity of the cabin environment on the thermal comfort of the occupants were considered in [7]. From the thermodynamic and psychometric analysis it is evident that a change in the relative humidity can facilitate the process of air conditioning and reduce energy losses.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of thermal conditions inside a vehicle cabin

Orzechowski

Skrobacki

2016

EPJ Web of Conferences

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Abstract. There are several important factors influencing road accidents. Temperature inside the vehicle is ranked third after alcohol and seat belts. For this reason, maintaining thermal comfort in the passenger compartment is essential. Thermal comfort is provided by the air conditioning system, which consumes much energy. In the case of electrically powered vehicles, this results in a shorter range. Optimization of such systems is therefore required. This paper proposes a set of equations describing the thermal conditions inside the vehicle, which are the result of appropriate energy balances for air, interior elements, and glass. Variable transmission conditions are included for transparent materials exposed to short and long wave radiation. The study focused on unsteady air-conditioning of the vehicle interior. The measurement data was compared with the results obtained through numerical solutions of the proposed set of equations.

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Vehicular thermal comfort models; a comprehensive review

Cited by 105 publications

References 28 publications

Transient thermal model of a vehicle's cabin validated under variable ambient conditions

Transient thermal model of a vehicle's cabin validated under variable ambient conditions

Objective and subjective assessment of selected factors of the work environment of forest harvesters and forwarders

Evaluation of thermal conditions inside a vehicle cabin

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