Ing. Jan Pokorný, Ph.D.
E-mail:   pokorny.j@fme.vutbr.cz  Dept.:   Energy Institute Dept. of Thermodynamics and Environmental Engineering Position:   Assistant Professor Room:   A2/408

Publications:

• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  Virtual Testing Stand for evaluation of car cabin indoor environment, Elsevier
  journal article in Web of Science
• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  A parametric study of influence of material properties on car cabin environment,
  EPJ Web of Conferences, pp.573-576, ISBN 978-80-260-5375-0, (2014), EDP Sciences
  conference paper
  akce: Experimental fluid mechanics 2013, Kutná Hora, 19.11.2013-22.11.2013
• FIŠER, J.; POKORNÝ, J.:
  Effect of car speed on amount of air supplied by ventilation system to the space of car cabin,
  EPJ Web of Conferences, pp.201-204, ISBN 978-80-260-5375-0, (2014), EDP Sciences
  conference paper
  akce: Experimental fluid mechanics 2013, Kutná Hora, 19.11.2013-22.11.2013
• FIŠER, J.; POKORNÝ, J.; PODOLA, D.; JÍCHA, M.:
  EXPERIMENTAL INVESTIGATION OF CAR CABIN ENVIRONMENT DURING REAL TRAFFIC CONDITIONS,
  Engineering Mechanics, Vol.20, (2013), No.3/4, pp.229-236, ISSN 1802-1484, Association for Engineering Mechanics
  journal article - other
• POKORNÝ, J.; JÍCHA, M.:
  Coupling of the Models of Human Physiology and Thermal Comfort,
  Proceedings of the International Conference Experimental Fluid Mechanics 2012, pp.590-593, ISBN 978-80-7372-912-7, (2013), EDP Sciences
  conference paper
  akce: Experimental Fluid Mechanics 2012, Hradec Králové, 20.11.2012-23.11.2012
• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  Operational Heat Balance Model with Parameterized Geometry for the Prediction of Car Cabin Heat Loads, VEETECH Ltd.
  journal article in Web of Science
• FIŠER, J.; POKORNÝ, J.; PODOLA, D.; JÍCHA, M.:
  Experimental investigation of car cabin environment during real traffic conditions,
  31. setkání kateder mechaniky tekutin a termomechaniky, sborník příspěvků, pp.51-54, ISBN 978-80-214-4529-1, (2012), VUT v Brně
  conference proceedings
  akce: 31. setkání kateder mechaniky tekutin a termomechaniky, Mikulov, 26.06.2012-28.06.2012
• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  Calibration of the Heat Balance Model for Prediction of Car Climate,
  EPJ Web of Conferences, pp.928-932, ISBN 978-80-7372-784-0, (2012), EDP Sciences
  conference paper
  akce: Experimental Fluid Mechanics 2011, Jičín, 22.11.2011-25.11.2011
• FIŠER, J.; POKORNÝ, J.; JÍCHA, M.:
  Prediction of car cabin environment by means of 1D and 3D cabin model,
  EPJ Web of Conferences, pp.145-150, ISBN 978-80-7372-670-6, (2012), EDP Sciences
  conference paper
  akce: Experimental Fluid Mechanics 2010, Liberec, 24.11.2010-26.11.2010
• FIŠER, J.; POKORNÝ, J.; FORMAN, M.; JÍCHA, M.:
  Investigation of thermal comfort in aircraft cabin by means of Comfort zones model, National and Kapodestrian University of Athens
  abstract
• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  MULTI-SEGMENT MODEL FOR PREDICTION OF HUMAN PHYSIOLOGY RESPONSES AND THERMAL COMFORT IN NON-HOMOGENOUS ENVIRONMENTS, National and Kapodestrian University of Athens
  abstract
• FIŠER, J.; POKORNÝ, J.; JÍCHA, M.:
  1D SOFTWARE TOOLS FOR SIMULATIONS OF INDOOR CABIN ENVIRONMENT,
  Transaction of the VŠB-Technical university of Ostrava, Mechanical series, Vol.2010, (2011), No.3, pp.61-67, ISSN 1210-0471, VŠB - Technická univerzita Ostrava
  journal article - other
• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  PREDIKCE TEPELNÉ POHODY DLE ZHANG S VYUŽITÍM TANABEHO MODELU FYZIOLOGIE ČLOVĚKA,
  Simulace budov a techniky prostředí. Sborník 6.konference IBPSA-CZ, pp.7-11, ISBN 978-80-254-8661-0, (2010), ČVUT
  conference paper
  akce: Simulace budov a techniky prostředí 2010, Praha, 08.11.2010-09.11.2010
• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  Prediction of thermal comfort in non-homogenous environment by means of multi-segmented models.
  abstract
  akce: 8th International Meeting for Manikins and Modeling, Victoria,BC, 22.08.2010-26.08.2010
• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  Predikce tepelné pohody v nehomogenních prostředích pomocí vícesegmentových modelů,
  XXIX. Setkání kateder mechaniky tekutin a termomechaniky, pp.231-234, ISBN 978-80-248-2244-0, (2010), Vysoká škola báňská Ostrava
  conference paper
  akce: XXIX. mezinárodní konference Setkání kateder mechaniky tekutin a termomechaniky, Rožnov pod Radhoštěm, 23.06.2010-25.06.2010
• POKORNÝ, J.; FIŠER, J.:
  Používané modely lidského tepelného komfortu,
  Strojárstvo/Strojírenství, Vol.2009, (2009), No.mimořádné, pp.209-210, ISSN 1335-2938, Media / ST s.r.o.
  journal article - other
  akce: XXVIII. Stretnutie katedier mechaniky tekutín a termomechaniky, Jasná, Demänovská dolina, 24.06.2009-26.06.2009
• LÍZAL, F.; JEDELSKÝ, J.; POKORNÝ, J.; JÍCHA, M.; ŠTĚTINA, J.:
  Study of Air Flow in Simplified Transparent Airway Model,
  Strojárstvo/Strojírenství, Vol.2009, (2009), No.mimořádné, pp.159-160, ISSN 1335-2938, Media / ST s.r.o.
  journal article - other

List of publications at Portal BUT

Abstracts of most important papers:

• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  Virtual Testing Stand for evaluation of car cabin indoor environment, Elsevier
  journal article in Web of Science
  In the paper the authors refer to a new computational tool for the transient prediction of the car cabin environment and heat load during real operating conditions. The aim of the Virtual Testing Stand software is to support an early stage of the HVAC design process to predict demands for the heating and cooling for various operational conditions and types of car. This software was developed in Matlab as a standalone executable application including a parametric generator of car cabin geometry, a heat transfer model and a graphical user interface. The mathematical model is formed by the set of heat balance equations, which takes into account the heat accumulation, and the heat exchange between the car cabin, the outside environment, the HVAC system and the passengers. In this paper the main features of Matlab application are presented together with a selected sensitivity study of two significant parameters in a winter test case.
• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  A parametric study of influence of material properties on car cabin environment,
  EPJ Web of Conferences, pp.573-576, ISBN 978-80-260-5375-0, (2014), EDP Sciences
  conference paper
  akce: Experimental fluid mechanics 2013, Kutná Hora, 19.11.2013-22.11.2013
  Recently the author presented the paper describing a car cabin heat load model for the prediction of the car cabin environment. The model allowed to simulate a transient behavior of the car cabin, i.e. radiant temperature of surfaces, air temperature and relative humidity. The model was developed in Dymola and was built on the basic principles of thermodynamics and heat balance equations. The model was validated by experiments performed on the Škoda Felicia during various operational conditions. In this paper the authors present a parametric study investigating influence of material properties on a car cabin environment. The Matlab version of the car cabin heat load model has been developed and used. The model was extended by simple graphical user interface and it was deployed into the stand alone executable application. The aim of this parametric study is to identify most important material properties and its effect on the cabin environment during specific operational conditions of car. By means of a sensitive analysis it can identified which material parameters have to be defined precisely and which parameters are not so important for the prediction of the air temperature inside cabin.
• POKORNÝ, J.; JÍCHA, M.:
  Coupling of the Models of Human Physiology and Thermal Comfort,
  Proceedings of the International Conference Experimental Fluid Mechanics 2012, pp.590-593, ISBN 978-80-7372-912-7, (2013), EDP Sciences
  conference paper
  akce: Experimental Fluid Mechanics 2012, Hradec Králové, 20.11.2012-23.11.2012
  A coupled model of human physiology and thermal comfort was developed in Dymola/Modelica. A coupling combines a modified Tanabe model of human physiology and thermal comfort model developed by Zhang. The Coupled model allows predicting the thermal sensation and comfort of both local and overall from local boundary conditions representing ambient and personal factors. The aim of this study was to compare prediction of the Coupled model with the Fiala model prediction and experimental data. Validation data were taken from the literature, mainly from the validation manual of software Theseus-FE [1]. In the paper validation of the model for very light physical activities (1 met) indoor environment with temperatures from 12 C up to 48 C is presented. The Coupled model predicts mean skin temperature for cold, neutral and warm environment well. However prediction of core temperature in cold environment is inaccurate and very affected by ambient temperature. Evaluation of thermal comfort in warm environment is supplemented by skin wettedness prediction. The Coupled model is designed for non-uniform and transient environmental conditions; it is also suitable simulation of thermal comfort in vehicles cabins. The usage of the model is limited for very light physical activities up to 1.2 met only.
• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  Operational Heat Balance Model with Parameterized Geometry for the Prediction of Car Cabin Heat Loads, VEETECH Ltd.
  journal article in Web of Science
  The paper presents the development of a mathematical model and a simulation tool for the transient prediction of the indoor climate and the heat loads in a car cabin, under real operating conditions. The main objectives were to develop a tool which facilitates, for example, the design of a cabin HVAC system or an on-line control. The model is based on the energy balance between the cabin and the outdoor environment accounting for conduction, convection and shortwave and longwave radiation. Inside the car cabin, the heat exchange is calculated between the human body, the air zone, the interior cabin surfaces and the incoming air from the HVAC system. The heat balance model assumes a simplified 3D geometry of a cabin, which is specified by seven basic parameters. The model also allows simulating the incidence angle of the sun rays onto the individual parts of the exterior surface during parking as well as during a journey. The model was tested and evaluated for a Škoda Felicia Combi car in situations of summer parking and an autumn journey. Measured data were used both as boundary conditions for the model and as validation and calibration data. The air temperature inside the car cabin, predicted by the model, was in a very good agreement with the measured mean air temperature. The model is able to correctly predict the indoor cabin air temperature and the heat loads into the car cabin, thus it is well suited as a software support tool in the process of HVAC design and on-line cabin climate control.
• POKORNÝ, J.; FIŠER, J.; JÍCHA, M.:
  Calibration of the Heat Balance Model for Prediction of Car Climate,
  EPJ Web of Conferences, pp.928-932, ISBN 978-80-7372-784-0, (2012), EDP Sciences
  conference paper
  akce: Experimental Fluid Mechanics 2011, Jičín, 22.11.2011-25.11.2011
  In the paper, the authors refer to development a heat balance model to predict car climate and power heat load. Model is developed in Modelica language using Dymola as interpreter. It is a dynamical system, which describes a heat exchange between car cabin and ambient. Inside a car cabin, there is considered heat exchange between air zone, interior and air-conditioning system. It is considered 1D heat transfer with a heat accumulation and a relative movement Sun respect to the car cabin, whilst car is moving. Measurements of the real operating conditions of gave us data for model calibration. The model was calibrated for Škoda Felicia parking-summer scenarios.