scholarly journals Investigation on Thermal Characteristics of the Oil-Circulating Hydraulic Energy Storage System for Hybrid Mining Trucks

2021 ◽  
Vol 9 ◽  
Author(s):  
Tong Yi ◽  
Fei Ma ◽  
Chun Jin ◽  
Jichao Hong ◽  
Yanbo Liu
Keyword(s):  
Energy Storage ◽  
Heat Dissipation ◽  
Cooling System ◽  
Storage System ◽  
Thermal Characteristics ◽  
Energy Storage System ◽  
Thermal Design ◽  
Installation Space ◽  
Cooling Power ◽  
Transfer Model

The improved hydraulic energy storage system (IHESS) is a novel compact hydraulic ESS with only 10% of oil and 64.78% of installation space of the regular ones. However, its novel circulating structure and lightweight material result in poor heat dissipation. The thermodynamic and heat transfer model of IHESS with an oil-circulating layout is proposed. Based on the mining trucks’ dynamic model, thermal characteristics of IHESSs with different parameters under the actual and simplified working conditions are studied and the factors causing overheating are analyzed. Finally, a feasible thermal design is put forward, and its efficiency is analyzed. The simulation shows that more accumulators and higher recovery power lead to higher system temperature and vice versa. Under the standard simplified working condition at 40°C ambient temperature, the highest oil temperature reached is 93.13°C. About 90% of the generated heat is converted into the internal energy of nitrogen and oil. On this basis, by adopting an energy-saving passive cooling system with a cooling power of 6.68 kW, the highest temperature of the oil drops to 52.79°C and 28% of the generated heat is released through the cooling system.

scholarly journals Enhanced Thermal Characteristics of NG Based Acetamide Composites

2019 ◽  
Vol 8 (10) ◽  
pp. 4227-4231 ◽  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Storage System ◽  
Thermal Characteristics ◽  
Energy Storage System ◽  
Melting Time

Fatty acids are a distinguished category of phase change materials (PCM). However, their inferior thermal conductivity value restricts their potential for thermal energy storage system. Carbonaceous nanomaterials have emerged as promising thermal conductivity enhancer materials for organic PCMs. The present study focuses on preparing a novel PCM nanocomposite comprising of small amount of nanographite (NG) in molten acetamide, an organic PCM, for elevation of the thermal characteristics and examining the trend of the nanocomposite through the course of charging / discharging process. These PCM-nanocomposites are prepared by dispersing NG in molten acetamide with weight fractions of 0.1, 0.2, 0.3, 0.4 and 0.5 %. The scanning electronic microscopic (SEM) analysis was conducted for the characterization of PCM nanocomposite. The energy storage behaviour of the prepared nanocomposites were analyzed with the help of differential scanning calorimeter instruments, which showed that there is no observable variation in the melting point of the nanocomposite, and a decline in the latent heat values. Furthermore, thermal conductivity trend of the nanocomposites caused by NG addition was investigated, which indicated enhancement of thermal conductivity with increasing NG concentration. Further, nanocomposites with a 0.4 wt. % of NG, displayed appreciable increase in rate of heat transfer, reducing melting time and solidification time by 48 and 47 %, respectively. The prepared PCM nanocomposites displayed superior heat transfer trend, permitting substantial thermal energy storage.

Modeling and Simulation of Building Cooling System With Supercooling-Based Ice Energy Storage

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Yili Zhang ◽  
Sean Kissick ◽  
Hailei Wang
Keyword(s):  
Energy Consumption ◽  
Energy Storage ◽  
Cooling System ◽  
Low Cost ◽  
Storage System ◽  
Electric Energy ◽  
Energy Storage System ◽  
Heavy Load ◽  
Electricity Cost ◽  
Hourly Temperature

Abstract City’s electricity power grid is under heavy load during on-peak hours throughout summer cooling season. As the result, many utility companies implemented the time-of-use rate of electricity leading to high electricity cost for customers with significant cooling needs. On the other hand, the need for electricity and/or cooling decreases greatly at night, creating excess electricity capacity for further utilization. An innovative ice energy storage system is being developed leveraging a unique supercooling-based ice production process. During off-peak hours, the proposed system stores the low-cost electric energy in the form of ice; during on-peak hours, the system releases the stored energy to meet extensive home cooling needs. Thus, it can not only reduce energy and cost of cooling, but also increase the penetration of renewable energies (especially wind energy). In this paper, the working principles of the system is presented along with the modeling details of the overall system and several key components. The simulink model takes in hourly temperature and peak/off peak electricity cost data to dynamically simulate the amount of energy required and associated cost for cooling an average home. Both energy consumption and cost for homes using the cooling system with ice energy storage in two US cities have been compared with those using conventional HVAC cooling system. According to the model, huge reduction in energy cost (up to 3X) can be achieved over 6 months of cooling season in regions with high peak electricity rates. While only moderate reduction on energy consumption is predicted for the ice energy storage system, further energy reduction potentials have been identified for future study.

Dynamic Modeling and Simulation of Home Cooling System With Supercooling-Based Ice Energy Storage

2019 ◽  
Author(s):  
Yili Zhang ◽  
Sean Kissick ◽  
Hailei Wang
Keyword(s):  
Energy Consumption ◽  
Energy Storage ◽  
Cooling System ◽  
Low Cost ◽  
Storage System ◽  
Electric Energy ◽  
Energy Storage System ◽  
Heavy Load ◽  
Electricity Cost ◽  
Hourly Temperature

Abstract City’s electricity power grid is under heavy load during on-peak hours throughout summer cooling season. As the result, many utility companies implemented the time-of-use rate of electricity leading to high electricity cost for customers with significant cooling needs. On the other hand, the need for electricity and/or cooling decreases greatly at night, creating excess electricity capacity for further utilization. An innovative ice energy storage system is being developed leveraging a unique supercooling-based ice production process. During off-peak hours the proposed system stores the low-cost electric energy in the form of ice; during on-peak hours the system releases the stored energy to meet extensive home cooling needs. Thus, it can not only reduce energy and cost of cooling, but also increase the penetration of renewable energies (especially wind energy). In this paper, the working principles of the system is presented along with the modeling details of the overall system and several key components. The Simulink model takes in hourly temperature and peak/off peak electricity cost data to dynamically simulate the amount of energy required and associated cost for cooling an average home. Both energy consumption and cost for homes using the cooling system with ice energy storage in two US cities have been compared with those using conventional HVAC cooling system. According to the model, huge reduction in energy cost (up to 3X) can be achieved over six months of cooling season in regions with high peak electricity rates. While only moderate reduction on energy consumption is predicted for the ice energy storage system, further energy reduction potentials have been identified for future study.

Thermal Analysis of an Energy Storage System for a Battery Electric Switcher Locomotive

2015 ◽  
Author(s):  
James A. Kreibick ◽  
Marc Serra Bosch ◽  
Timothy P. Cleary ◽  
Brent Ballew
Keyword(s):  
Energy Consumption ◽  
Energy Storage ◽  
Computer Aided Design ◽  
Cooling System ◽  
Storage System ◽  
Air Flow ◽  
Energy Storage System ◽  
Battery Pack ◽  
Area Network ◽  
Data Logger

Often, available power from an in-vehicle energy storage system is governed by thermal limitations. Modeling of battery pack thermal response is crucial to managing its cooling system energy consumption and estimating available charge/discharge power for future locomotive tractive and regenerative effort. Active cooling through forced air flow was simulated using computer-aided design of the battery pack and its enclosure. Module scaled (series string of 54 12V batteries) testing and modeling of both air flow and temperature distribution was performed and validated for sealed lead acid carbon batteries. A controller area network and data logger collected temperature data from 218 sensors placed throughout a battery pack module during electrical loading for both switcher and over-the-road cycles while under various environmental thermal loadings. A blower on-off control algorithm was optimized to minimize energy consumption and implemented based on temperature array statistics.

scholarly journals Advancements in Thermal Energy Storage System by Applications of Nanofluid Based Solar Collector: A Review

2020 ◽  
Vol 24 (1) ◽  
pp. 310-340
Author(s):  
Vednath P. Kalbande ◽  
Pramod V. Walke ◽  
C. V. M. Kriplani
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Solar Collector ◽  
Cooling System ◽  
Storage System ◽  
Thermal Storage ◽  
Energy Storage System ◽  
Research Progress ◽  
Thermal Energy Storage System

AbstractIn the recent years, a lot of research has been carried out in the field of nanofluid based solar collector, leading towards the enhancement of working efficiency even at low atmospheric temperature or at low sunlight levels regions of the world. The present review pertains to the research progress related to the performance execution of solar collector using nanofluid. It is observed that the thermal energy storage system (TES), using solar collector, is a useful device for storing sensible and latent heat in a unit volume. Nanofluid plays an important role in various thermal applications such as heat exchanger, solar power generation, automotive industries, electronic cooling system, etc. The nanoparticles find the use in various industrial applications because of its properties, such as thermal, mechanical, optical and electrical. Most of the investigations carried out earlier on the applications of nanofluid in solar energy are related to their uses in the solar collector and thermal storage system. The parabolic solar collector using nanofluid is still a challenge. This article presents an exhaustive review of thermal storage system using nanofluid based solar collector and a scope of using nanofluid based solar collector for performance enhancement.

Charging and discharging characteristics of sensible energy storage system with multiple cylindrical passages

2021 ◽  
pp. 1-12
Author(s):  
Ravi Kumar ◽  
Anil Kumar Patil ◽  
Manoj Kumar
Keyword(s):  
Energy Efficiency ◽  
Energy Storage ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Storage System ◽  
Thermal Characteristics ◽  
Energy Storage System ◽  
Transient Temperature ◽  
Inlet Temperature

Abstract Sensible energy storage systems can be integrated with domestic and industrial systems to fulfill energy needs in the absence of an energy source. The present study experimentally investigates the thermal characteristics of a sensible energy storage system with multiple cylindrical passages during the charging and discharging cycles. Transient temperature distribution, energy storage, energy release, charging/discharging energy efficiency are evaluated by varying the mass flow rate of air from 0.022 to 0.031 kg/s and inlet air temperature from 45 to 75 oC. The maximum charging energy efficiency of 81.3% was found at 55 oC inlet temperature and 0.031 kg/s of the mass flow rate of air. The maximum discharging energy efficiency is found to be 74.3% corresponding to 45 oC inlet temperature and 0.031 kg/s of the mass flow rate of air.

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