Improving the operation modes efficiency in heat pump systems of hot water supply with the two-stage heat accumulation

Мазуренко, Антон Станиславович; Denysova, Alla; Balasanian, Gennadiy; Klimchuk, A A; Borysenko, Krystyna

doi:10.15587/1729-4061.2017.92495

Cited by 7 publications

(5 citation statements)

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“…Проте вони мають більшу питому щільність енергії, завдяки чому істотно зменшуються маса і об'єм акумулятора. В залежності від робочої речовини теплові акумулятори з фазовим переходом поділяються на низькотемпературні (до 120°С), середньотемпературні (120−400°С) та високотемпературні (400-1000°С) [17]. В нашому дослідженні будуть розглянуті теплові акумулятори першої температурної групи.…”

Section: рис 3 зміна температури робочої речовини сезонного акумулятораunclassified

Heat energy storages

Derii,

Zgurovets

2023

Sist. dosl. energ. (Online)

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The article provides an analytical review of thermal energy storage. The reasons determining their demand are shown. It has been established that the market of thermal accumulators is developing quite dynamically. According to the forecast of the International Renewable Energy Agency, the global market for thermal accumulators may triple by 2030 from 234 GWh of installed capacity in 2019 to about 800 GWh in 2030. Investments in the development of thermal accumulators are expected to reach 13–28 billion US dollars. Their capacity for power generation can be 491–631 GWh, for heat supply – 143–199 GWh, for cooling – 23–26 GWh. Bloomberg NEF considers the main drivers of such a sharp increase in energy storage capacity are the US Inflation Reduction Act, which provides for more than $369 billion in financing for clean technologies, as well as the European Union's RE Power EU plan to reduce dependence on gas from Russia. The significant additional storage capacity expected from 2025 in the utility sector is in line with the very ambitious renewable energy targets set out in the REPowerEU plan. The purpose of this review is the search and analysis of thermal energy storage technologies for their possible use in the centralized heat supply of Ukraine. The conducted review showed that the most advanced technology for the accumulation of thermal energy is heat capacity of the material storage. It is the cheapest and most common in centralized heat supply. For short-term storage of heat energy, it is advisable to use storage tanks and main heat networks. Special insulated concrete underground storages of both natural and artificial origin are used for seasonal accumulation of thermal energy. A promising technology for seasonal thermal energy storage is an ice battery developed by the Viessmann company, which requires much less space than the heat capacity of the material storage technology. Thermochemical batteries are in the early stages of development, their demonstration samples may be manufactured by 2050. Keywords: battery, thermal energy, heat capacity, phase transition.

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Section: рис 3 зміна температури робочої речовини сезонного акумулятораunclassified

Heat energy storages

Derii,

Zgurovets

2023

Sist. dosl. energ. (Online)

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“…The latter option involves a significant reduction in capital costs for the reconstruction of the heat supply system, allows to align the schedule of heat sources, has a positive effect on their efficiency and service life [11].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Efficiency of Using Energy Resources in Heat Supply Systems of Buildings With Variable Operation Mode

Klymchuk

Denysova

Balasanian

2020

EUREKA: Physics and Engineering

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As a research result, characteristic indicators of the efficiency of using various heat sources in combined heat supply systems were determined. During the study, various schemes for integrating heat accumulators in heat supply systems were considered. Water was used as a battery, which also acts as a coolant. Mathematical modeling of processes in combined heat supply systems using intermittent heating is carried out. The characteristic operating modes of the elements of heat supply systems that take into account the operating modes of heat consumers are determined. Mathematical modeling was carried out using a software package that allows to obtain the distribution of heat power of the heat supply system by its main elements and its characteristic operation modes. According to the research results, a coefficient of thermal power reduction and a coefficient of efficiency of using the heat accumulator volume were proposed. These coefficients allow to evaluate the efficiency of heat sources and the efficiency of using the volume of the heat storage tank. Based on the obtained data, the task was set to optimize the daily load of the heat source, taking into account the installation of the storage tank. The research results can be used for the reconstruction of heat supply systems of buildings with a two-period operation mode (operation duty) using both traditional and renewable heat sources. This will significantly increase the efficiency of the use of elements of the heat supply system, even out the daily heat generation schedule and increase the service life of the main equipment

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“…The use of solid materials significantly reduces the amount of heat accumulator due to high operating temperatures and simplicity of design. And with a low power of the heat accumulator, it becomes possible to use it directly in a heated room [9].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigation of the Efficiency of the Use of Heat-Accumulating Material for Heat Supply Systems

Klymchuk

Denysova

Shramenko

et al. 2019

EUREKA: Physics and Engineering

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As a result of research, the conditions for the effective use of the volume of heat accumulator based on solid materials were determined. In the course of research, various schemes of the device of tubular heating elements for charging the channel elements of the heat accumulator were considered. Fire clay was used as a heat-accumulating material, capable of operating in a wide temperature range (up to 600 °С). Mathematical modeling of temperature change in the process of discharge over the cross section of the heat-accumulating unit has been carried out. Mathematical modeling was carried out using an application package that allows to obtain the temperature distribution over the cross section of the heat accumulator at key points of its work. The obtained simulation results were tested on an experimental setup consisting of four heat-accumulating units during the charging process and during the discharge of the heat accumulator. According to the research results, the most effective layout of the heating elements was determined, which allows to make the most of the volume of the heat-accumulating material. The dependencies to determine the exponent and the averaging coefficient of the heat flux are also found, which allow a more rational use of the volume of the accumulating nozzle. The research results can be used to reconstruct decentralized heat supply systems for both residential buildings and public buildings. This will significantly align the schedule of electricity consumption during the day and reduce the consumption of hydrocarbon fuels.

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Improving the operation modes efficiency in heat pump systems of hot water supply with the two-stage heat accumulation

Cited by 7 publications

References 1 publication

Heat energy storages

Heat energy storages

Enhancing Efficiency of Using Energy Resources in Heat Supply Systems of Buildings With Variable Operation Mode

Theoretical and Experimental Investigation of the Efficiency of the Use of Heat-Accumulating Material for Heat Supply Systems

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