scholarly journals Water-paraffin dispersion systems: manufacturing and application

2020 ◽  
pp. 31-47
Author(s):  
Alla Yovchenko ◽  
Sergii Bespalko ◽  
Oksana Tryhub ◽  
Sviatoslav Poliakov ◽  
Guy Baret ◽  
...  
Keyword(s):  
Storage Tank ◽  
Storage Capacity ◽  
Heat Storage ◽  
Surface Active Agent ◽  
Active Agent ◽  
Heating System ◽  
Solar Heating ◽  
Heat Transfer Fluid ◽  
Study Results ◽  
The Stability

The paper presents the study results of the stability and heat storage capacity of paraffin-in-water phase change suspensions (PCSs) obtained by the homogenization of paraffin and water in the developed rotary hydrodynamic homogenizer. The optimal concentration of components for obtaining stable paraffin-in-water suspensions is found. It is shown that the stable PCSs in the form of pastes, gels, and liquids can be obtained depending on the concentration of water, paraffin, and the surface active agent (SAA) as well as its type. In addition, the scheme of the solar heating system with the heat storage tank where the PCS functions both as the heat transfer fluid and the heat storage media is presented. It is shown that the use of PCS in the domestic solar heating system allowed the heat storage capacity of the storage tank to be increased by 25% as a result of the high fusion heat of paraffin and the high value of the water specific heat capacity. The estimation of the saving rate from applying fluid PCS as a heat storage medium is also presented and discussed.

Indoor Air Temperature Analysis of Solar Heating System With Dual Heat Storage Devices

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Yu Qihui ◽  
Hao Xueqing ◽  
Tan Xin
Keyword(s):  
Mathematical Model ◽  
Air Temperature ◽  
Indoor Air ◽  
Storage Tank ◽  
Heat Storage ◽  
Heating System ◽  
Solar Heating ◽  
Minimum Size ◽  
Temperature Characteristics ◽  
Storage Devices

Using solar energy for space heating is an efficient and simply way to satisfy the energy demands of buildings. In this study, a typical office building is selected as a case model to obtain indoor air temperature characteristics with dual heat storage devices. By analyzing our solar heating system, a mathematical model of the system working process is set up. Using the software matlab/simulink for simulation, the indoor air temperature characteristics in 1 day are obtained. Simulation and experimental results show good consistency. And using the mathematical model, the storage tank size is optimized to search for the minimum size for the fixed building. Based on our analysis, the optimum ratio of storage tank A volume and collector field area is 0.11 m. This research can be a good reference for the design of the solar heating system.

scholarly journals Optimization Analysis on Storage Tank Volume in Solar Heating System

2015 ◽  
Vol 121 ◽  
pp. 1356-1364 ◽  
Author(s):  
Tao Li ◽  
Yanfeng Liu ◽  
Dengjia Wang ◽  
Kaifeng Shang ◽  
Jiaping Liu
Keyword(s):  
Storage Tank ◽  
Heating System ◽  
Solar Heating ◽  
Optimization Analysis

scholarly journals Thermochemical energy storage – from fundamental research to TRL IV

2019 ◽  
Vol 108 ◽  
pp. 02013
Author(s):  
Piotr Babiński ◽  
Michalina Kotyczka – Morańska ◽  
Jarosław Zuwała
Keyword(s):  
Energy Storage ◽  
Heat Carrier ◽  
Storage Tank ◽  
Storage Capacity ◽  
Heat Storage ◽  
Solid Medium ◽  
Storage System ◽  
Reversible Reactions ◽  
Thermochemical Heat Storage ◽  
Fundamental Research

The paper presents the results of the fundamental research devoted to the application of MgSO4 as a heat carrier for thermochemical seasonal storage system devoted for household application followed by the results of 35kWh storage tank (TRL IV) charging and discharging tests. Seasonal thermochemical heat storage, based on the reversible reactions of hydratation and dehydratation of a solid medium gives an opportunity to accumulate the energy with a storage capacity exceeding 300-400 kWh/m3.

Thermodynamics of Phase-Change Storage in Series With a Heat Engine

1995 ◽  
Vol 117 (4) ◽  
pp. 336-341 ◽  
Author(s):  
C. Charach ◽  
M. Conti ◽  
C. Bellecci
Keyword(s):  
Phase Change ◽  
Heat Storage ◽  
Freezing Point ◽  
Heat Engine ◽  
Stability Limit ◽  
Heat Transfer Fluid ◽  
Maximal Entropy ◽  
Constant Flow Rate ◽  
In Series ◽  
The Stability

This paper addresses thermodynamics of phase-change storage elements in series with heat engines. It is assumed that the duration of the heat storage and the discharge are equal. It is also assumed that the same heat transfer fluid (HTF) with a constant flow rate is used for the whole cycle. The major constraint imposed on these systems is the stability of the temperature of the HTF supplied to the engine during the storage-discharge cycle. It is shown, for this setup, that the freezing point of the phase-change material (PCM) is defined by the First Law. Maximal stability corresponds to the freezing point equal to the arithmetic mean of the inlet temperatures of the hot and the cold streams. An analytic expression is developed for the Second Law efficiency of the heat storage-removal cycle for the phase-change element in series with an engine. It yields maximal entropy production in the absolute stability limit. Two analytically tractable models of a phase-change storage in series with a heat engine are studied in detail. One involves a PCM slab, and the second involves a PCM tube-and-shell heat exchanger.

A new design concept of thermal storage tank for adaptive heat charging in solar heating system

2020 ◽  
Vol 165 ◽  
pp. 114617
Author(s):  
Jiarong Li ◽  
Xiangdong Li ◽  
Ruiqing Du ◽  
Yong Wang ◽  
Jiyuan Tu
Keyword(s):  
Storage Tank ◽  
Thermal Storage ◽  
Heating System ◽  
Solar Heating ◽  
Design Concept
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