Sustainability | Free Full-Text | Optimal Operation of Low-Capacity Heat Pump Systems for Residential Buildings through Thermal Energy Storage …
The paper provides results from a hardware-in-the-loop experimental campaign on the operation of an air-source heat pump (HP) for heating a reference dwelling in Pisa, Italy. The system performances suffer from typical oversizing of heat emission devices and high water-supply temperature, resulting in HP inefficiencies, …
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Performance analysis and operation optimization of air-to-water CO2 heat pump with phase change thermal storage …
When CO 2 heat pump is used for space heating, the high return water temperature leads to excessive throttling loss and low efficiency of the heat pump unit. In order to solve this problem, an air-to-water CO 2 heat pump unit combined with phase change thermal storage for space heating was proposed and its feasibility has been …
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STATE OF THE ART REVIEW OF SEASONAL SENSIBLE …
INTRODUCTION. Seasonal thermal energy storage (STES) is the technology to store heat in summer for winter use, and the storage method, depending on the materials, can be …
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Research on Visual Operation and Maintenance of Building Air …
Nov 25, 2022, Wenhong Yu and others published Research on Visual Operation and Maintenance of Building ... subjects'' overall thermal comfort was significantly improved while allowing them to ...
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Optimization Operation of Wind-solar-thermal-storage Multi …
In this paper, a pre-economic dispatching model is established for the large-scale energy storage, new energy cluster and thermal power system in multiple regions, aiming to achieve the self-balance of power and electricity within the region as far as possible, improve the level of new energy consumption, and reduce the power and power adjustment of …
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Heat transfer efficient thermal energy storage for steam …
A novel reflux heat transfer storage (RHTS) concept for producing high-temperature superheated steam in the temperature range 350–400 °C was developed and tested. The thermal storage medium is a metallic substance, Zinc–Tin alloy, which serves as the phase change material (PCM). A high-temperature heat transfer fluid (HTF) is …
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Optimal Operation of CHP Units and Thermal Storage Electric …
Optimal Operation of CHP Units and Thermal Storage Electric Heating … 57 3.3 CHP Unit The thermoelectric ratio of the backpressure CHP unit is fixed, and the electrical output is fixed after the heat load is determined. Compared with the back
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Energies | Free Full-Text | Investigation on Long Term …
The efficient storing and utilizing of industrial waste heat can contribute to the reduction of CO2 and primary energy. Thermochemical heat storage uses a chemical and/or an adsorption-desorption reaction …
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Comparison study on operation and mechanical characteristics of liquid sodium thermoclinic heat storage …
This section mainly focuses on the charging and discharging performance comparison of the liquid sodium THS tank when different SFMs are used. For the comparison, the operation of the THS tank with no SFM is also simulated. Fig. 3, Fig. 4, Fig. 5 show the comparison results of charging performances of the liquid sodium THS tank …
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6 Low-temperature thermal energy storage
BOX 6.5 Seasonal aquifer storage of Stockholm''s airport. Stockholm''s Arlanda Airport has the world''s largest aquifer storage unit. It contains 200 million m3 of groundwater and can store 9 GWh of energy. One section holds cold water (at 3-6°C), while another has water heated to 15-25°C. The system works like a giant seasonal thermos ...
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Performance evaluation and operation optimization of a combined heat and power plant integrated with molten salt heat storage …
The molten salt heat storage system can store high temperature thermal energy [28], and the industrial process steam can be generated by molten salt heat storage system[29], [30]. When the industrial process steam is generated by molten salt heat storage system to meet the heat load of the CHP plant, the maximum adjustable power …
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Design and simulation analysis of high-temperature heat-storage …
The temperature change of the thermal-storage materials is 1200°C, 1300°C, 1400°C, 150°C or 1600°C. Economic analysis is an important task for the …
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Optimal design and operation of thermal energy storage systems …
1. Introduction The technical, economic and environmental feasibility of micro-cogeneration plants –according to the cogeneration directive published in 2004 [1], cogeneration units with electric power below 50 kW e – in the residential sector is intimately tied to the correct sizing of micro-CHP and thermal energy storage systems, as well as …
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Experimental and numerical investigations on operation characteristics of seasonal borehole underground thermal energy storage …
To investigate experimentally characteristics of SBUTES, a borehole energy storage test platform with reduced size was established based on similarity principle (shown in Fig. 1) [25].As shown in Fig. 1, the test platform consists of sand tank, thermostatic water bath, U-shaped buried pipes, circulating pumps, connecting lines, flow meters and …
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Performance and operation mode analysis of a heat recovery and thermal storage solar-assisted heat …
This experiment has been conducted in China, Kunming city (longitude 102.43 E and latitude 25.02 N). Related meteorological data of Kunming city is shown in Table 1.The dimensions of the drying room was (L = 2.5 m, W = 2 m and H = 2 m) this experiment 10 kg of radish were used to be dried by the drying system under three …
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Optimal design and operation of thermal energy storage systems in micro-cogeneration plants …
Introduction The technical, economic and environmental feasibility of micro-cogeneration plants –according to the cogeneration directive published in 2004 [1], cogeneration units with electric power below 50 kW e – in the residential sector is intimately tied to the correct sizing of micro-CHP and thermal energy storage systems, as well as …
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(PDF) A simple method for the design of thermal energy storage systems …
A, Schematic representation of a latent heat thermal energy storage (LHTES) system consisting of 14 plates in parallel. A detail of one plate is depicted on the right. B, Sketch showing plates in ...
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Off-design operation analysis of air-based high-temperature heat and power storage …
Off-design performance analysis of air-based high-temperature heat and power storage is presented. •. The performance of the system is assessed for operation loads from 10% to 100%. •. The overall, electrical and heat efficiencies are 91%, 28%, and 63% at nominal load. •.
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Capacity and operation optimization of a low-temperature nuclear heating system considering heat storage …
This is because the capacity of the heat storage device is related not only to the heating load characteristics of heat consumers, but also to the specific operation strategy of the nuclear heating system (Lai and Locatelli, 2021; Liu et …
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(PDF) Energy Performance of Annual Operation of Heat Pump Coupled with Ground Ice Storage and Photovoltaic/Thermal …
PDF | The use of heat pumps for annual climatization is a suitable mean of achieving the 2030 European decarbonization target (-55% with respect to 1990... | Find, read and cite ...
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Variable load modes and operation characteristics of closed Brayton cycle pumped thermal electricity storage system with liquid-phase storage ...
However, during charge and discharge process, the solid packed bed creates a thermal front that propagates along the storage tank, which not only reduces the maximum utilization of the storage tank and increases the …
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Thermal characteristics and operation efficiency of solid-state electro thermal storage …
In the process of experimental studies of thermal operation conditions, characteristics of ETS, temperature values where recorded in a number of test points: T1 — temperature of wall of incoming air channel of heat storage unit …
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Sustainability | Free Full-Text | A Comprehensive Review of …
Abstract. Thermal energy storage (TES) is a technology that stocks thermal energy by heating or cooling a storage medium so that the stored energy can be used at a later time …
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(PDF) Optimal operation of a district heating power …
Seshadhri Srinivasan, Carmen Del V ecchio and Luigi Glielmo. Abstract — This paper presents an optimal control strategy. for a district heating power plant with thermal energy storage. The main ...
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Operational optimization in district heating systems with the use …
The aim of this document is to present the topic of operational optimization in District Heating (DH) systems, with special focus on different kinds of …
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Visual studies of the operation of loop heat pipes by neutron …
The loop heat pipes were made of stainless steel with a titanium wick. •. Ammonia and methanol were used as working fluids. Neutron radiography was used to visually study the operation of two compact loop heat pipes (LHPs) having a similar configuration, made of stainless steel and equipped with a titanium wick.
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Structure and Operation Optimization of a Form-Stable Carbonate/Ceramic-Based Electric Thermal Storage …
The escalating demand for heating and the widespread use of CO2-emitting fossil fuels during cold seasons have imposed significant pressure on our natural resources. As a promising alternative to coal-fired boilers, electrical thermal storage devices (ETSDs) for space heating are gaining popularity. However, designing ETSDs for space heating …
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Conceptual design and dynamic simulation of an integrated solar driven thermal system with thermochemical energy storage …
In Latent Heat Storage (LHS) heat is mainly stored in the phase-change process and is directly connected with the latent heat of the substance, such as ice, paraffin, or hydrated salts [4]. Finally, there are also other options in which thermochemical energy or a combination of these energy forms is stored [5] .
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Current, Projected Performance and Costs of Thermal Energy Storage
The technology for storing thermal energy as sensible heat, latent heat, or thermochemical energy has greatly evolved in recent years, and it is expected to grow up to about 10.1 billion US dollars by 2027. A thermal energy storage (TES) system can significantly improve industrial energy efficiency and eliminate the need for additional …
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Flexible Operation Mode of Coal-fired Power Unit Coupling with Heat Storage of Extracted Reheat Steam | Journal of Thermal …
In order to provide more grid space for the renewable energy power, the traditional coal-fired power unit should be operated flexibility, especially achieved the deep peak shaving capacity. In this paper, a new scheme using the reheat steam extraction is proposed to further reduce the load far below 50% rated power. Two flexible operation …
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