A Simple Technique for Analyzing Waste-Heat Recovery with Heat-Storage in Batch Processes

1993 ◽  
pp. 1063-1072 ◽  
Author(s):  
S. Stoltze ◽  
B. Lorentzen ◽  
P. M. Petersen ◽  
B. Qvale
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Heat Storage ◽  
Simple Technique ◽  
Waste Heat ◽  
Batch Processes

Waste-Heat Recovery in Batch Processs Using Heat Storage

1995 ◽  
Vol 117 (2) ◽  
pp. 142-149 ◽  
Author(s):  
S. Stoltze ◽  
J. Mikkelsen ◽  
B. Lorentzen ◽  
P. M. Peterson ◽  
B. Qvale
Keyword(s):  
Energy Saving ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Heat Storage ◽  
Waste Heat ◽  
Maximum Energy ◽  
Point Method ◽  
Batch Processes ◽  
Storage Tanks ◽  
Pinch Point

The waste-heat recovery in batch processes has been studied using the pinch-point method. The aim of the work has been to investigate theoretical and practical approaches to the design of heat-exchanger networks, including heat storage, for waste-heat recovery in batch processes. The study is limited to the incorporation of energy-storage systems based on fixed-temperature variable-mass stores. The background for preferring this to the alternatives (variable-temperature fixed-mass and constant-mass constant-temperature (latent-heat) stores) is given. It is shown that the maximum energy-saving targets as calculated by the pinch-point method (time average model, TAM) can be achieved by locating energy stores at either end of each process stream. This theoretically large number of heat-storage tanks (twice the number of process streams) can be reduced to just a few tanks. A simple procedure for determining a number of heat-storage tanks sufficient to achieve the maximum energy-saving targets as calculated by the pinch-point method is described. This procedure relies on combinatorial considerations, and could therefore be labeled the “combinatorial method” for incorporation of heat storage in heat-exchanger networks. Qualitative arguments justifying the procedure are presented. For simple systems, waste-heat recovery systems with only three heat-storage temperatures (a hot storage, a cold storage, and a heat store at the pinch temperature) often can achieve the maximum energy-saving targets. Through case studies, six of which are presented, it is found that a theoretically large number of heat-storage tanks (twice the number of process streams) can be reduced to just a few tanks. The description of these six cases is intended to be sufficiently detailed to serve as benchmark cases for development of alternative methods.

scholarly journals Optimal Design of Combined Two-Tank Latent and Metal Hydrides-Based Thermochemical Heat Storage Systems for High-Temperature Waste Heat Recovery

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4216 ◽  
Author(s):  
Serge Nyallang Nyamsi ◽  
Mykhaylo Lototskyy ◽  
Ivan Tolj
Keyword(s):  
Energy Storage ◽  
Melting Point ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Heat Storage ◽  
Waste Heat ◽  
Storage Systems ◽  
Storage System ◽  
Metal Hydrides ◽  
Thermochemical Heat Storage

The integration of thermal energy storage systems (TES) in waste-heat recovery applications shows great potential for energy efficiency improvement. In this study, a 2D mathematical model is formulated to analyze the performance of a two-tank thermochemical heat storage system using metal hydrides pair (Mg2Ni/LaNi5), for high-temperature waste heat recovery. Moreover, the system integrates a phase change material (PCM) to store and restore the heat of reaction of LaNi5. The effects of key properties of the PCM on the dynamics of the heat storage system were analyzed. Then, the TES was optimized using a genetic algorithm-based multi-objective optimization tool (NSGA-II), to maximize the power density, the energy density and storage efficiency simultaneously. The results indicate that the melting point Tm and the effective thermal conductivity of the PCM greatly affect the energy storage density and power output. For the range of melting point Tm = 30–50 °C used in this study, it was shown that a PCM with Tm = 47–49 °C leads to a maximum heat storage performance. Indeed, at that melting point narrow range, the thermodynamic driving force of reaction between metal hydrides during the heat charging and discharging processes is almost equal. The increase in the effective thermal conductivity by the addition of graphite brings about a tradeoff between increasing power output and decreasing the energy storage density. Finally, the hysteresis behavior (the difference between the melting and freezing point) only negatively impacts energy storage and power density during the heat discharging process by up to 9%. This study paves the way for the selection of PCMs for such combined thermochemical-latent heat storage systems.

scholarly journals Cost performance optimization of waste heat recovery supply chain by mobile heat storage vehicles

2020 ◽  
Vol 6 ◽  
pp. 137-146 ◽  
Author(s):  
Jing Yang ◽  
Jiayu Chen ◽  
Zhiyong Zhang ◽  
Ming Hong ◽  
Han Li ◽  
...  
Keyword(s):  
Supply Chain ◽  
Performance Optimization ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Heat Storage ◽  
Waste Heat ◽  
Cost Performance

scholarly journals Improved performance of binder-free zeolite Y for low-temperature sorption heat storage

2018 ◽  
Vol 6 (24) ◽  
pp. 11521-11530 ◽  
Author(s):  
Alenka Ristić ◽  
Fabian Fischer ◽  
Andreas Hauer ◽  
Nataša Zabukovec Logar
Keyword(s):  
Low Temperature ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Heat Storage ◽  
Waste Heat ◽  
Zeolite Y ◽  
Binder Free ◽  
Improved Performance ◽  
Sorption Heat ◽  
Modified Binder

Improved performance of modified binder-free zeolite Y in mobile sorption heat storage for low-temperature industrial waste heat recovery.

The Experiment Research on Storage Characteristic of PCM Storage Device by Spheres Piled Encapsulated for Vehicle Waste Heat

2014 ◽  
Vol 983 ◽  
pp. 383-387 ◽  
Author(s):  
Tian Shi Zhang ◽  
Qi Yi Wang ◽  
Guo Hua Wang ◽  
Chun Gao ◽  
Qing Gao
Keyword(s):  
Melting Point ◽  
Flow Rate ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Heat Storage ◽  
Waste Heat ◽  
Thermal Environment ◽  
Melting Rate ◽  
Storage Device ◽  
Medium Flow

For the thermal environment and the warming requirement of Vehicle, carry out experiment study on heat storage characteristic of phase change materials (PCM) encapsulated by Spherical stack. heat storage and release experiment process , changing factors such as medium flow rate and melting point which impact on PCM heat transfer characteristics , melting rate and response time have been analyzed. The results show that within the scope of experiment high medium flow rate is conducive to promote PCM melting rate and heat storage. In the experiments process, high melting point of PCM storage heat grade is high, but the low melting point of PCM is more suitable for vehicle motor, batteries in low temperature waste heat recovery. At the same time, multi-melting point PCM storage device with spheres piled encapsulated delamination mixed stowage was better satisfy the different condition of waste heat recovery and utilization than single melting point of PCM.

Performance analysis of latent heat storage system by fin orientation and nano added PCM for diesel engine waste heat recovery

2020 ◽  
Author(s):  
Karthikeyan Paramasivam ◽  
Kanimozhi Balakrishnan ◽  
Kumarasubramanian Ramar ◽  
Yuvaraja Subramani ◽  
Swaraj Bikram Samal ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Performance Analysis ◽  
Latent Heat ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Heat Storage ◽  
Waste Heat ◽  
Storage System ◽  
Latent Heat Storage

scholarly journals Study on the performance of Double-pipe phase heat exchangers in waste heat recovery with heat storage and discharge

2021 ◽  
Vol 2076 (1) ◽  
pp. 012002
Author(s):  
Quanying Yan ◽  
Yuan Guo ◽  
Chao Ma
Keyword(s):  
Heat Exchange ◽  
Flow Rate ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Storage Time ◽  
Heat Storage ◽  
Waste Heat ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Double Pipe

Abstract The heat transfer performance of the double-pipe phase change heat storage and exothermic device and its cycle system for waste heat recovery was studied experimentally. 10 different experimental conditions were set by adjusting the inlet temperature, inlet flow rate and heat storage time of the phase change heat storage and exothermic device to study the changes of the outlet temperature, heat exchange and the inlet and outlet temperature of the heat sink of the heat-using device. The experimental results show that the higher the inlet temperature, the higher the flow rate and the longer the heat storage time, the higher the average heat exchange and the longer the heat release time of the heat exchanging device. The phase heat exchanger designed and used in this experimental research provides a certain experimental basis and data reference, which can be used for waste heat recovery in industrial and other fields.

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