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A concept of a micro-polygeneration system for zero-energy building

Krajewska Paula, Dawidowicz Bartosz, Cieśliński Janusz T.

Acta Mechanica et Automatica

2025

Vol. 19, no. 1

26--31

This paper presents a concept of a zero-energy system for powering a single-family house based on a PV system, an electrolyser, a hydrogen gas storage, a fuel cell and a heat pump. Estimated is the demand for electricity and thermal energy consumed in a house inhabited by 3 people and a usable area of 80 m2. The investment costs of the installation were estimated based on the commercially available offer.

The use of accumulation elements with lumped parameters to model the operation of heat exchange installations under randomly changing temperatures

Kropiwnicki Jacek, Dawidowicz Bartosz, Wojewódka Przemysław, Rogala Andrzej

Chemical and Process Engineering : New Frontiers

2024

Vol. 45, nr 3

art. no. e66

At the design stage of heat exchange installation used for gas conversion it is required to test the stability of the installation operation for the expected variable heat loads. For this purpose, a numerical model of the installation can be used. The paper presents an original concept of modelling the operation of heat exchange installations for randomly changing temperatures. Accumulation elements with lumped parameters were used in the model, which significantly facilitates the definition of model parameters and the calculation itself at the design stage. Due to the randomly changing temperatures supplying the accumulation element by the heating medium and the non-linear nature of the functions used in the calculation model, the iterative procedure was used for calculations. The process of validation of the proposed computational model of the accumulation element with lumped parameters was carried out for a water installation powered by a natural gas-fired boiler. The obtained results showed very good accuracy of the applied approach, the root mean square error for tested data has reached 1°C to 3°C, depending on the analysed case.