Milan Janak - Academia.edu (original) (raw)

Papers by Milan Janak

The Impact of Relative Position of the High-Rise Buildings on the Wind Flow

Applied Mechanics and Materials, 2016

The Venturi effect has been defined as the increase in fluid speed or flow rate due to a decrease... more The Venturi effect has been defined as the increase in fluid speed or flow rate due to a decrease of the flow section. In the present paper the wind speed conditions in passages between triangular buildings with different distances are studied with Computational Fluid Dynamics (CFD) to investigate the extent to which the Venturi effect is present in the passages. In this paper are considered eight different variants of relative positions of the two high-rise buildings. The variable is a distance between towers. They are investigated maximum wind velocities and the point at which the maximum velocity occurs for each from these variants.

Solar Energy, 1998

This paper describes the approach taken within the European Community's IMAGE (IMplementation of ... more This paper describes the approach taken within the European Community's IMAGE (IMplementation of Advanced Glazing in Europe) 97 project to apply combined thermal/daylight simulations to existing and proposed building designs incorporating advanced glazing systems. The application of the approach to a live design project is described to exemplify the process and the outcome.

This paper reports the background, status and current outcome of a collaborative European Union s... more This paper reports the background, status and current outcome of a collaborative European Union sponsored international project which aims to promote computer modelling and simulation of energy in buildings by creating hypertext based self-learning course material and publishing it on the World Wide Web.

In our paper we describe an application of the building simulation techniques to the assessment o... more In our paper we describe an application of the building simulation techniques to the assessment of an energy, thermal comfort and natural ventilation effectiveness in the office with a double skin facade. Two distinct building simulation techniques are applied. Firstly, it is a Computational Fluid Dynamics (CFD) technique to assess wind effects on a building façade and to carry out detailed simulation of natural ventilation of an office. Secondly, it is a dynamic building energy simulation coupled with an air flow network model to predict annual performance related to the energy, thermal comfort and natural ventilation. Results of this application simulation study clearly show that a particular design of a double skin façade has a significant negative effect on natural ventilation when compared to the typical operable window. On the other hand results show that with the aid of simulation approach it is possible to identify a construction measures to optimise façade performance.

This paper describes a simulation based method for the integrated performance appraisal of buildi... more This paper describes a simulation based method for the integrated performance appraisal of buildings incorporating daylight utilisation technologies. The method utilises the ESP-r [1] and RADIANCE [2] systems, running synchronously or in pre-simulation mode, to construct a multi-variate performance picture for a range of models representing alternative design intents.

As argued before (Hensen 1993), the built environment is rather complex and involves many interac... more As argued before (Hensen 1993), the built environment is rather complex and involves many interactions. Even when we limit ourselves to energy, environmental and comfort issues, real building design questions are usually too complicated to be solved using simple rules or design guidelines. One way of dealing with this complexity is by using computer modelling and simulation. This paper

In this paper, a new method of direct run- time coupling between building energy simulation and g... more In this paper, a new method of direct run- time coupling between building energy simulation and global illuminance simulation is outlined and discussed. Direct coupling at the time step level between ESP-r and RADIANCE provides building energy simulation with access to an internal illuminance calculation engine, thus enabling modelling of the complex interactions between artificial lighting control and the rest of the building energy domain in a fully integrated way.

In the paper we describe an integrated building lighting and thermal simulation activities carrie... more In the paper we describe an integrated building lighting and thermal simulation activities carried out in the support of EU PV-Light Project. A part of the project has focused on an experimental quantification of a moveable PV solar shading façade modules fitted to the external test cells. An experimental data has been used to calibrate building energy and daylighting simulation models. The calibrated integrated building energy and daylighting models have been used to carry out a multiple runs with the different facades options under a range of the European climate conditions. The simulations have focused on the prediction of building heating, cooling and lighting demands that are used to assess an individual PV façades performance.

This paper reports the current state of an ongoing collaborative project which aims to promote mo... more This paper reports the current state of an ongoing collaborative project which aims to promote modelling and simulation of energy in buildings by making self-learning course material available on the World Wide Web (WWW). INTRODUCTION Computer modelling and simulation has become a very important technology for assisting engineers with their non-trivial task of designing/analysing buildings and associated environmental systems such that the result is low energy consumption, good indoor conditions and minimal impact on the environment in general. This fact is recognised by many engineering schools and in several cases the technology has been fully integrated in the curriculum; see for example (Clarke 1994). The WWW is emerging as a powerful medium for dispersing and acquiring all kinds of information. For various reasons - such as graphical attractiveness, low accessibility threshold level and flat learning curve - it seems to appeal to students, and therefore it might prove to become...

based energy simulation courses in Central/Eastern Europe This paper reports the current state of... more based energy simulation courses in Central/Eastern Europe This paper reports the current state of an ongoing collaborative project which aims to promote modelling and simulation of energy in buildings by making self-learning course material available on the

This paper outlines the current state-of-the-art in integrated building simulation. The ESP-r sys... more This paper outlines the current state-of-the-art in integrated building simulation. The ESP-r system is used as an example where integrated simulation is a core philosophy behind the development. The current state and future developments are documented with examples. The importance of the interoperability is discussed in the area of air flow, multi-dimensional conduction, lighting, CFD, and power flow modelling. It is argued that for building simulation to penetrate the profession in the near future, there is a need for appropriate training and professional technology transfer initiatives.

The European Commission’s Daylight-Europe (DL-E) project set out to produce design guidelines for... more The European Commission’s Daylight-Europe (DL-E) project set out to produce design guidelines for practitioners wishing to incorporate daylight utilisation principles within buildings as a means to displace the electrical power consumption associated with artificial lighting. The intention was to produce these guidelines in a designer-friendly format, where notable examples are used to illustrate the operational and integration aspects of the different possible approaches. Within the project simulation was applied to several existing buildings incorporating different daylight utilisation technologies. For each case studied, performance has been assessed in terms of HVAC and electrical system capacities, fuel consumption, environmental emissions, thermal and visual comfort and glare sources.

In this paper, a new method of direct run-time coupling between building energy simulation and gl... more In this paper, a new method of direct run-time coupling between building energy simulation and global illuminance simulation is outlined and discussed. Direct coupling at the time step level between ESP-r and RADIANCE provides building energy simulation with access to an internal illuminance calculation engine, thus enabling modelling of the complex interactions between artificial lighting control and the rest of the building energy domain in a fully integrated way.

Daylight performance : Daylight quality and control of energy consumption

Simulating the Thermal Effects of Daylight-controlled Lighting

This paper describes a simulation based method for the integrated performance appraisal of buildi... more This paper describes a simulation based method for the integrated performance appraisal of buildings incorporating daylight utilisation technologies. The method utilises the ESP-r [1] and RADIANCE [2] systems, running synchronously, to construct a multi-variate performance picture for a range of models representing alternative design intents.

Daylight calculations for the new Antwerp law courts (Daglichtberekeningen voor het nieuwe gerechtsgebouw te Antwerpen)

Predictive modelling of proposed alterations to GTW offices

The Scotsman Publications Ltd. - New Head Office - Edinburgh. Report Tasks 1 and 2

Performance Assessment Method for DL-E Case Study Simulations