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Lichota J.,Instytucie Techniki Cieplnej i Mechaniki Plynow | Lepszy M.,Instytucie Inzynierii Lotniczej
Rynek Energii | Year: 2013

This article shows the results of experiments that allow for the identification of dynamic properties of balls filled with phase change material (PCM) changing its physical state from solid to liquid during the delivery of heat. PCM behaviour was studied using impulse signal through changing the temperature of the water, which surrounds PCM. The impulse response of heat accumulator was modeled utilizing transfer functions of first order differential equations. The resulting theoretical model was compared with measurements. Equations of the single ball allow the modeling of dynamic properties of heat accumulator during charging and discharging. This is important during operation of CHP supplying district heating where prediction algorithms are applied. Knowing a future heat demand by customers and knowing the characteristics of the accumulator, CHP can more precisely set an electricity selling policy on a market. Source


Wojs K.,Instytucie Techniki Cieplnej i Mechaniki | Polko K.,Instytucie Inzynierii Lotniczej | Lichota J.,Instytucie Techniki Cieplnej i Mechaniki
Rynek Energii | Year: 2012

The paper shows methodology of computation of condensing cross-flow, counter-flow heat exchanger flue gases-water utilized to heat recovery from flue gases leaving lignite fired power station. The method of computations is presented on example of design of heat exchanger area A recovering heat from flue gases. At the beginning computations were performed for heat transfer without condensation, then after reaching dew temperature through flue gases - with condensation. All operational parameters were set along length of the condensing heat exchanger. Source


This paper describes changes in domestic heating networks till 2025 on example of Wrocław and Opole. Conclusions concerning directions of heat market development are drawn from changes in international environment, then national, and the specificity of both cities. The authors predict that the implementation of EU law in Poland will lead to considerable transformations in the market and heat sources leading to reduction of heat demand by customers and increasing optimization of heating systems. Source


Pawlak-Kruczek H.,Instytut Techniki Cieplnej i Mechaniki Plynow | Lichota J.,Instytucie Inzynierii Lotniczej | Plutecki Z.,Instytucie Elektrowni i Systemow Pomiarowych
Rynek Energii | Year: 2011

This paper shows the results of research performed on own constructions of a brown coal dryer. Three different constructions of dryers were considered and investigated. Energy demand for commercial dryers depends on utilized process and is in a range (330, 4000) kJ/kg H2O. The authors showed energy demand for own constructions; coal analysis: water content before and after drying, chns - analysis, TGA analysis. Simulations of a drying process inside a dryer are shown, too. Source


Wojs K.,Instytucie Techniki Cieplnej i Mechaniki Plynow | Lichota J.,Instytucie Inzynierii Lotniczej | Bechtold Z.,Instytucie Techniki Cieplnej i Mechaniki Plynow
Rynek Energii | Year: 2011

This paper presents methodology of thermal computations for heat storage in phase changing materials (PCM). Computational and experimental results are shown for paraffin. Several concepts of applications of PCM in power stations and CHP's are discussed. Source

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