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Performance analysis and PCM selection for adsorption chiller aided by energy storage supplied from the district heating system

Karwacki Jarosław, Kwidziński Roman, Leputa Piotr

Archives of Thermodynamics

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2022

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Vol. 43, no 4

135--169

EN

The paper presents a theoretical analysis of thermal energy storage filled with phase change material (PCM) that is aimed at optimization of an adsorption chiller performance in an air-conditioning system. The equations describing a lumped parameter model were used to analyze internal heat transfer in the cooling installation. Those equations result from the energy balances of the chiller, PCM thermal storage unit and heat load. The influence of the control of the heat transfer fluid flow rate and heat capacity of the system components on the whole system operation was investigated. The model was used to validate the selection of Rubitherm RT62HC as a PCM for thermal storage. It also allowed us to assess the temperature levels that are likely to appear during the operation of the system before it will be constructed.

2

Diffusive-inertial droplet separation model from two-phase flow

Mikielewicz Jarosław, Dolna Oktawia, Kwidziński Roman

Archives of Thermodynamics

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2021

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Vol. 42, no 3

141--158

EN

This paper concerns analytical considerations on a complex phenomenon which is diffusive-inertial droplet separation from the two-phase vapour-liquid flow which occurs in many devices in the power industry (e.g. heat pumps, steam turbines, organic Rankine cycles, etc.). The new mathematical model is mostly devoted to the analysis of the mechanisms of diffusion and inertia influencing the distance at which a droplet separates from the two-phase flow and falls on a channel wall. The analytical model was validated based on experimental data. The results obtained through the analytical computations stay in a satisfactory agreement with available literature data.

3

Analiza zastosowania magazynu ciepła z materiałem PCM przy niedopasowaniu wydajności źródła i odbiornika chłodu

Karwacki Jarosław, Kwidziński Roman, Lackowski Marcin, Kapica Paulina, Śniadała Tadeusz, Leputa Piotr, Laskowski Marek

Nowa Energia

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2019

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nr 2

40--49

PL

W pracy omówiono zagadnienia projektowe związane z doborem magazynu chłodu z materiałem PCM do instalacji wody lodowatej zasilanej agregatem adsorpcyjnym. Dla analizowanego obiegu opracowano model o parametrach skupionych i wykonano obliczenia pięciu różnych przypadków. Analiza otrzymanych wyników pozwoliła na określenie optymalnej wielkości magazynu oraz wpływu działania elementów automatyki.