Michel Y. Haller
Graz University of Technology
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Michel Y. Haller.
Journal of Building Performance Simulation | 2011
Michel Y. Haller; Janne Paavilainen; L. Konersman; A. Droscher; Elimar Frank; Chris Bales; Wolfgang Streicher
A unified model for the simulation of oil, gas, pellet and wood chip space heating boilers for energy estimating purposes has been developed based on a literature review and laboratory measurements on four different boilers. The model includes the influence of space heating return temperature, power modulation and condensation gains on the flue gas losses of the boiler, the simulation of a thermal boiler capacitance including its heat losses during standby and operation, and the ability to calculate carbon monoxide emissions and electricity use dependent on power modulation and number of burner starts. Some of the new features of the presented boiler model are the unification of models for oil, gas and biomass boilers into one model, and the combination of steady state calculation for the flue gas to water heat transfer with an explicit solution for the time dependent temperature change of the boilers thermal capacitance.
Journal of Building Performance Simulation | 2011
Michel Y. Haller; Janne Paavilainen; L. Konersman; Robert Haberl; A. Droscher; Elimar Frank; Chris Bales; Wolfgang Streicher
A semi-physical model for the simulation of oil, gas and biomass space heating boilers has been parameterized based on measurements on nine different boiler units and simulation results have been compared to results obtained from measurements in steady state and transient operation. Although the agreement between simulated and measured boiler efficiencies was within the range of measurement uncertainties in most cases, model improvements are expected to be possible concerning the heat capacitance modelling in cycling on/off operation as well as influences of start and stop behaviour on the overall efficiency. It is found that electricity consumption during cycling on/off operation of small pellets or oil space heating boilers may have a significant influence on the overall energy balance of these units. This influence increases strongly with decreasing heat load and increasing number of on/off cycles.
EuroSun 2014 | 2015
David Chèze; Philippe Papillon; Antoine Leconte; Michel Y. Haller; Robert Haberl; Tomas Perrson; Chris Bales
The objective of this work is the development of harmonized efficiency test methods for combined renewable heating systems for houses, using a hardware-in-the-loop approach. An overview of the principles of the existing whole system test methods used by 3 research institutes involved in the project (MacSheep 2012) is given. Main objectives are realistic dynamic test sequence elaboration for solar and heat pump systems and comparison of results from tests achieved in different institutes. In order to reach these objectives, the first phase of the work aimed to harmonize the boundary conditions that comprise both the physical boundaries of the tested system as well as the climate and heat load definition, and this is presented in the first part of the article. The second part presents two methodologies to elaborate 12-days and 6-days whole system test sequences, validation results for solar and air source heat pump systems (SHP) and a methodology for achieving equal amount of space heat supplied by the tested system while at the same time providing a realistic response of the heat distribution system.
Solar Energy | 2009
Michel Y. Haller; Cynthia A. Cruickshank; Wolfgang Streicher; Stephen J. Harrison; Elsa Andersen; Simon Furbo
EuroSun 2010 | 2010
Elimar Frank; Michel Y. Haller
ISES Solar World Congress 2011 | 2011
Michel Y. Haller; Elimar Frank
Energy Procedia | 2014
Daniel Carbonell; Michel Y. Haller; Daniel Philippen; Elimar Frank
Solar Energy | 2010
Michel Y. Haller; Eshagh Yazdanshenas; Elsa Andersen; Chris Bales; Wolfgang Streicher; Simon Furbo
Energy Procedia | 2014
Daniel Carbonell; Michel Y. Haller; Elimar Frank
Energy Procedia | 2014
Michel Y. Haller; Robert Haberl; Igor Mojic; Elimar Frank