Identification of the objective function for optimization of a seasonal thermal energy storage system

Milewski, Jarosław; Szabłowski, Łukasz; Bujalski, Wojciech

doi:10.2478/aoter-2014-0034

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…2. These are the parameters of the district heating network in Warsaw [13,15]. For the purposes of economic analysis there was used a compressor system with refrigerant R410A operating with a nominal cooling capacity ofQ e = 10 kW.…”

Section: Methodsmentioning

confidence: 99%

Possibility of using adsorption refrigeration unit in district heating network

Grzebielec

Rusowicz

Jaworski

et al. 2015

Archives of Thermodynamics

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Adsorption refrigeration systems are able to work with heat sources of temperature starting with 50 °C. The aim of the article is to determine whether in terms of technical and economic issues adsorption refrigeration equipment can work as elements that produce cold using hot water from the district heating network. For this purpose, examined was the work of the adsorption air conditioning equipment cooperating with drycooler, and the opportunities offered by the district heating network in Warsaw during the summer. It turns out that the efficiency of the adsorption device from the economic perspective is not sufficient for production of cold even during the transitional period. The main problem is not the low temperature of the water supply, but the large difference between the coefficients of performance, COPs, of adsorption device and a traditional compressor air conditioning unit. When outside air temperature is 25 °C, the COP of the compressor type reaches a value of 4.49, whereas that of the adsorption device in the same conditions is 0.14. The ratio of the COPs is 32. At the same time ratio between the price of 1 kWh of electric power and 1 kWh of heat is only 2.85. Adsorption refrigeration equipment to be able to compete with compressor devices, should feature COPads efficiency to be greater than 1.52. At such a low driving temperature and even changing the drycooler into the evaporative cooler it is not currently possible to achieve.

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Section: Methodsmentioning

confidence: 99%

Possibility of using adsorption refrigeration unit in district heating network

Grzebielec

Rusowicz

Jaworski

et al. 2015

Archives of Thermodynamics

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“…The problems of LHTES optimal operation and integration with heating systems are discussed, e.g. in [2,10,11].…”

Section: Introductionmentioning

confidence: 99%

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

2023

Archives of Thermodynamics

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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.

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