Publication detail

An innovative HVAC control system: Comparison of the system outputs to comfort votes

FIŠER, J. POKORNÝ, J. FOJTLÍN, M. TOMA, R.

Original Title

An innovative HVAC control system: Comparison of the system outputs to comfort votes

English Title

An innovative HVAC control system: Comparison of the system outputs to comfort votes

Type

abstract

Language

en

Original Abstract

Human thermal comfort in vehicular cabins has been broadly discussed in various contents. The most actual topics relate to efficient energy utilisation and enhancement of thermal comfort experience – especially in electric passenger vehicles. In fact, these two factors are contradictory at present; therefore, new concepts of HVAC management are being investigated. The presented study shows progress in the iHVAC project (Fišer et al., 2015; Fojtlín et al., 2017) that serves as a support system for a driver and passengers. The aim of the project is real-time evaluation of thermal conditions in the cabin using compact equivalent temperature sensors. To do so, methodology of the Comfort zone diagram and the MTV index (Mean Thermal Vote) are exploited. The concept has been tested previously against a newton type Manikin with good results. Now, the system performance was examined in two scenarios against a pool of eight volunteers. Firstly, the test vehicle was preconditioned to 0 °C and volunteers wore prescribed clothing (0.75 clo). In the second run, the chamber temperature was 10 °C and lighter clothing was worn (0.5 clo). The test protocol of both scenarios comprises preconditioning (60 min, tamb 23 °C), seating in a precooled vehicle (45 min, tamb 0 and 10 °C), and at the same time initiation of the HVAC system set to AUTO 24 °C. The volunteers were asked to rate the thermal comfort and sensation in the cabin every 3 min. These votes were compared with the system outputs and good match was found on the head, hands, and torso. The predictions were least accurate for legs, feet, and arms. Moreover, the methodology has its limitations, mainly to its applicability in stationary conditions, and further research is needed.

English abstract

Human thermal comfort in vehicular cabins has been broadly discussed in various contents. The most actual topics relate to efficient energy utilisation and enhancement of thermal comfort experience – especially in electric passenger vehicles. In fact, these two factors are contradictory at present; therefore, new concepts of HVAC management are being investigated. The presented study shows progress in the iHVAC project (Fišer et al., 2015; Fojtlín et al., 2017) that serves as a support system for a driver and passengers. The aim of the project is real-time evaluation of thermal conditions in the cabin using compact equivalent temperature sensors. To do so, methodology of the Comfort zone diagram and the MTV index (Mean Thermal Vote) are exploited. The concept has been tested previously against a newton type Manikin with good results. Now, the system performance was examined in two scenarios against a pool of eight volunteers. Firstly, the test vehicle was preconditioned to 0 °C and volunteers wore prescribed clothing (0.75 clo). In the second run, the chamber temperature was 10 °C and lighter clothing was worn (0.5 clo). The test protocol of both scenarios comprises preconditioning (60 min, tamb 23 °C), seating in a precooled vehicle (45 min, tamb 0 and 10 °C), and at the same time initiation of the HVAC system set to AUTO 24 °C. The volunteers were asked to rate the thermal comfort and sensation in the cabin every 3 min. These votes were compared with the system outputs and good match was found on the head, hands, and torso. The predictions were least accurate for legs, feet, and arms. Moreover, the methodology has its limitations, mainly to its applicability in stationary conditions, and further research is needed.

Keywords

car cabin, thermal comfort, thermal sensation, measurement, predction

Released

06.11.2017

Publisher

International Society for Environmental Ergonomics.

Location

Kobe, Japonsko

Pages from

39

Pages to

39

Pages count

1

URL

BibTex


@misc{BUT146250,
  author="Miloš {Fojtlín} and Jan {Fišer} and Jan {Pokorný} and Róbert {Toma} and Miroslav {Jícha}",
  title="An innovative HVAC control system: Comparison of the system outputs to comfort votes",
  annote="Human thermal comfort in vehicular cabins has been broadly discussed in various contents.
The most actual topics relate to efficient energy utilisation and enhancement of thermal comfort
experience – especially in electric passenger vehicles. In fact, these two factors are
contradictory at present; therefore, new concepts of HVAC management are being investigated.
The presented study shows progress in the iHVAC project (Fišer et al., 2015; Fojtlín et al.,
2017) that serves as a support system for a driver and passengers. The aim of the project is
real-time evaluation of thermal conditions in the cabin using compact equivalent temperature
sensors. To do so, methodology of the Comfort zone diagram and the MTV index (Mean
Thermal Vote) are exploited. The concept has been tested previously against a newton type
Manikin with good results. Now, the system performance was examined in two scenarios
against a pool of eight volunteers. Firstly, the test vehicle was preconditioned to 0 °C and
volunteers wore prescribed clothing (0.75 clo). In the second run, the chamber temperature was
10 °C and lighter clothing was worn (0.5 clo). The test protocol of both scenarios comprises
preconditioning (60 min, tamb 23 °C), seating in a precooled vehicle (45 min, tamb 0 and 10 °C),
and at the same time initiation of the HVAC system set to AUTO 24 °C. The volunteers were
asked to rate the thermal comfort and sensation in the cabin every 3 min. These votes were
compared with the system outputs and good match was found on the head, hands, and torso.
The predictions were least accurate for legs, feet, and arms. Moreover, the methodology has its
limitations, mainly to its applicability in stationary conditions, and further research is needed.
",
  address="International Society for Environmental Ergonomics.",
  chapter="146250",
  howpublished="online",
  institution="International Society for Environmental Ergonomics.",
  year="2017",
  month="november",
  pages="39--39",
  publisher="International Society for Environmental Ergonomics.",
  type="abstract"
}