Optimization of Heat Exchange in a Heat Accumulator with Latent Heat Storage

Luca, Constantin; Dragomir-Stanciu, Daniel; Crîșmaru, Ionuț Vasile

doi:10.1016/j.protcy.2015.02.104

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The necessary condition associated with the economic profitability of application of heat accumulation tanks (also called heat storage tanks and hot water accumulators [1][2][3][4][5][6]14]) in CHP plants and their operation in terms of the maximization of the peak load electricity production needs to be based on the financial settlements containing a guarantee of its purchase by the distribution companies at adequately high prices.…”

Section: Energies 2018 11 X For Peer Review 3 Of 20mentioning

confidence: 99%

“…The results of the latter form inputs for the subsequent economic analyses. The analysis of the application of heat accumulation tanks on the economic efficiency of a CHP plant is presented e.g., in the following works [1][2][3][4][5][6][7][8][9][10][11][12]. The methodology for analyzing the economic efficiency of any investment processes applied so far was based on the discrete notation of the measure of NPV (Net Present Value):…”

Section: Introductionmentioning

confidence: 99%

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Methodology and a Continuous Time Mathematical Model for Selecting the Optimum Capacity of a Heat Accumulator Integrated with a CHP Plant

et al. 2018

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This paper contains the results of a study in which a novel approach using continuous time notation was applied in the search for the optimum capacity of a heat accumulation tank to be combined with an existing CHP (combined heat and power) plant. The necessary condition associated with the economic profitability of the application of heat accumulation tanks in CHP plants is based on the condition that the profit from the exploitation of the modernized CHP plant does not decrease in relation to this profit before the process was initiated. Hence, the applied methodology provides a dependence that has universal application as it can be used to establish the optimal capacity of a heat accumulation tank suitable for any CHP plant design, i.e., for any thermal capacity of such a plant. The results also demonstrated that the specific enthalpies of the extracted steam before the base load heater and the maximum increase of the flow rate of the extracted steam feeding the base load heater in winter form the only necessary inputs for such calculations. The construction of the heat accumulation tank is only profitable for the case when the difference in the purchase prices at the times corresponding to peak load and base load electricity demand is sufficiently high.

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Section: Energies 2018 11 X For Peer Review 3 Of 20mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Methodology and a Continuous Time Mathematical Model for Selecting the Optimum Capacity of a Heat Accumulator Integrated with a CHP Plant

et al. 2018

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“…These solutions function both in the long and the short term (Lissner et al 2016). In their work (Constantin et al 2015) analysed the possibility of storing heat in a conventional residential building exchanger by using PCM. An organic PCM in the form of paraffin was used.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of the Energy Efficiency of Transparent Partitions with a Thermal Storage Unit

Musiał¹

2020

J. Ecol. Eng.

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The article presents the results of experimental research and a mathematical analysis of the energy efficiency of a PCM-modified transparent partition. The study was carried out during the summer season and heating season for 5 months under temperate climate conditions in Rzeszów (Poland). The solution under investigation allows for short-term storage of heat within a building window, owing to the high value of melting/freezing enthalpy of approx. 185 J/g, and the phase change material (PCM) applied. The research was conducted in parallel over two identical windows, with only one of them being modernised with a phase change thermal storage unit. The obtained results showed the possibility of improving the thermal balance of the window by 9.99%, and a more favourable adjustment of gains from solar radiation to the profile of heat demand of the adjacent room by 15.02%, compared to the reference window. The obtained results also allowed the numerical model describing the non-stationary heat exchange within the phase change material to be verified, using the solution of a Stefan problem. The obtained model was created using the equations of finite difference method in the Matlab environment. The verified model is highly compatible with empirical quantities, and constitutes a useful tool for simulating the distribution of heat storage in a PCM storage unit over time. This allows the heat gains resulting from the use of the tested storage units in the building windows to be estimated.

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“…All the chemical engineering processes often take place upon heating and cooling of substance flows. Due to the fact that thermal energy has the greatest valuein industrial processes, their heat balance can be drawn considering thermal effects, chemical reactions and physical transformations occurring in a device, as well as addition and removal of heat [2,3].…”

Section: Introductionmentioning

confidence: 99%

Graphene-Modified Heat-Accumulating Materials and Aspects of their Application in Thermotherapy and Biotechnologies

Shchegolkov

Galunin

Popova

et al. 2017

NHC

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The present work aims at implementing heat accumulators in real technological processes and poses a problem of practical importance.Heat accumulators have been the subject of laboratory research for a long time. Several authors have obtained certain results while studying such devices, but only few of them have considered their introduction into the industrial practice. In this regard, the present research provides two directions for applying heat accumulators: thermotherapy and methane tanks.The need to stabilize temperature conditions is common to these processes. To achieve this goal, graphene-modified sodium acetate (thermal conductivity ≈5,000 W/(m K))was used herein as heat accumulator with controlled discharge mode (heat dissipation). The possibility of improving the stability of sodium acetate when introducing graphene thereinto was established. Besides,charge/discharge modes were investigated under the operating conditions of thermotherapy and methane tanks.

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Optimization of Heat Exchange in a Heat Accumulator with Latent Heat Storage

Cited by 5 publications

References 6 publications

Methodology and a Continuous Time Mathematical Model for Selecting the Optimum Capacity of a Heat Accumulator Integrated with a CHP Plant

Methodology and a Continuous Time Mathematical Model for Selecting the Optimum Capacity of a Heat Accumulator Integrated with a CHP Plant

Experimental and Numerical Analysis of the Energy Efficiency of Transparent Partitions with a Thermal Storage Unit

Graphene-Modified Heat-Accumulating Materials and Aspects of their Application in Thermotherapy and Biotechnologies

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