The use of substations with PCM heat accumulators in district heating system

Nogaj, Kinga; Turski, Michał; Sekret, R.

doi:10.1051/matecconf/201817401002

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…The challenging issue limiting the integration of adsorption chiller for cold generation is the low heating medium's temperature for commercial adsorption heat pumps. The upgrade of the substation by thermal storage tanks with renewables could raise the available heat source temperature [15]. PCM storage unit seems promising among various heat storage technology as it requires 40% less volume than the water-based heat accumulator [13].…”

Section: Fig 1 Yearly Profile Of Heat Consumption In a Middle-sized Polish City By Chorowski [4]mentioning

confidence: 99%

“…The use of PCM heat storage is not deeply recognized as very limited information is reported [14]. The influence of using heat storage with PCM on inlet and outlet temperatures in substations was investigated by Nogaj et al [15]. The authors examined the integration of PCM with a single-function substation whose thermal power is 150 kW.…”

Section: Fig 1 Yearly Profile Of Heat Consumption In a Middle-sized Polish City By Chorowski [4]mentioning

confidence: 99%

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A hybrid district heating substation with an adsorption chiller and PCM storage units: a concept and preliminary study

et al. 2021

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Development of the district heating system (DHS) is needed to achieve the Renewable Energy Directive goals. To maintain the economic profitability of DHN, the increase of intensity of heat production/consumption has to be ensured. Well, a known method is a cold production using an adsorption heat pump. However, developing a system suitable for implementation in the district heating companies is very difficult. As a solution, the authors propose a composite substation equipped with the adsorption heat pump and the heat/cold storage system based on a PCM.

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Section: Fig 1 Yearly Profile Of Heat Consumption In a Middle-sized Polish City By Chorowski [4]mentioning

confidence: 99%

Section: Fig 1 Yearly Profile Of Heat Consumption In a Middle-sized Polish City By Chorowski [4]mentioning

confidence: 99%

A hybrid district heating substation with an adsorption chiller and PCM storage units: a concept and preliminary study

et al. 2021

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“…Therefore, there is a necessity for research and an urgent need to modernize the existing DHS in order to further develop and improve energy efficiency [13,14]. The solution that can solve these problems is modern heat storage technology-the utilization of dispersed PCM heat accumulators [15,16]. Currently, typical engineering solutions used to improve DHS efficiency within heating networks are lowering the temperature of the network water, using the technology of pre-insulated pipelines, and the replacement of group heating substations with individual ones equipped with regulation and automation.…”

Section: Introductionmentioning

confidence: 99%

Life Cycle Assessment of Dispersed Phase Change Material Heat Accumulators for Cooperation with Buildings in the District Heating System

Turski

Jachura

2022

Energies

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The wide use of energy-efficient district heating systems allows for decreased atmospheric pollution resulting from lower emissions. One of the ways to increase the efficiency of existing district heating systems, and a key element of new systems using renewable energy sources, is modern heat storage technology—the utilization of dispersed PCM heat accumulators. However, the use of different solutions and the inconsistency of selection methods make it difficult to compare the obtained results. Therefore, in this paper, using TRNSYS software, a standardization of the selection of dispersed PCM heat accumulators for cooperation with buildings in the DHS was proposed along with a Life Cycle Assessment. Life Cycle Assessment could be a good, versatile indicator for new developments in district heating systems. A new contribution to the research topic was the Life Cycle Assessment itself as well as the range of heat output of the substations up to 2000 kW and the development of nomograms and unitary values for the selection of individual parameters based on the relative amount of heat uncollected by buildings. The technical potential of heat storage value, %ΔQi,st, was from 49.4% to 59.6% of the theoretical potential of heat storage. The increases in the active volume of the PCM heat accumulator, dVPCM, and the mass of the required amount of PCM, dmst, were, respectively, 0.8 × 10−2–4.0 m3/kW and 1.3–6.7 × 10−2 kg/kW. Due to dispersed heat storage, an increase in system efficiency of 41% was achieved. LCA analysis showed that a positive impact on the environment was achieved, expressed as negative values of the Eco-indicator from −0.504 × 10−2 to −6.44 × 10−2 kPt/kW.

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“…Storage of heat or cold can be done with thermal energy storage (TES) using phase change materials (PCMs). PCMs incorporated in latent heat energy storages (LHTES) are used to store heat from solar collectors [ 3 , 4 ], to store energy from household wind power plants [ 5 ], in building heating and cooling systems [ 6 , 7 ], to support heat pumps and waste heat recovery installations [ 8 ], to support district heating networks [ 9 , 10 ]. In addition, PCMs are used to cool photovoltaic panels [ 11 ] and are also used in building structural elements like walls [ 12 , 13 , 14 ], windows [ 15 ] and roofs [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal Characterization of Medium-Temperature Phase Change Materials (PCMs) for Thermal Energy Storage Using the T-History Method

Rolka¹,

Kwidziński²,

Przybyliński³

et al. 2021

Materials

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To reduce energy consumption and increase energy efficiency in the building sector, thermal energy storage with phase change materials (PCMs) is used. The knowledge of the thermophysical properties and the characteristics of PCMs (like their enthalpy changes and the distribution of stored energy over a specified temperature range) is essential for proper selection of the PCM and optimal design of the latent thermal energy store (LHTES). This paper presents experimental tests of the thermophysical properties of three medium-temperature PCMs: OM65, OM55, RT55, which can be used in domestic hot water installations and heating systems. Self-made test chambers with temperature control using Peltier cells were used to perform measurements according to the T-history method. In this way the temperature range of the phase transition, latent heat, specific heat capacity, enthalpy and the distributions of stored energy of the three PCMs were determined. The paper also presents measurements of the thermal conductivity of these PCMs in liquid and solid state using a self-made pipe Poensgen apparatus. The presented experimental tests results are in good agreement with the manufacturers’ data and the results of other researchers obtained with the use of specialized instruments. The presented research results are intended to help designers in the selection of the right PCM for the future LHTES co-working with renewable energy systems, waste heat recovery systems and building heating systems.

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The use of substations with PCM heat accumulators in district heating system

Cited by 6 publications

References 11 publications

A hybrid district heating substation with an adsorption chiller and PCM storage units: a concept and preliminary study

A hybrid district heating substation with an adsorption chiller and PCM storage units: a concept and preliminary study

Life Cycle Assessment of Dispersed Phase Change Material Heat Accumulators for Cooperation with Buildings in the District Heating System

Thermal Characterization of Medium-Temperature Phase Change Materials (PCMs) for Thermal Energy Storage Using the T-History Method

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