| 1. |
- Guo, Shaopeng, et al.
(författare)
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Economic Assessment of Mobilized Thermal Energy Storage for Distributed Users : A Case Study in China
- 2016
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Ingår i: CUE 2015 - APPLIED ENERGY SYMPOSIUM AND SUMMIT 2015. - : Elsevier. ; 88, s. 656-661
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Konferensbidrag (refereegranskat)abstract
- Mobilized thermal energy storage (M-TES) system can be an alternative of the conventional heating system to meet the heat demand for distributed users. This paper conducted a case study of the M-TES system in China. The operating strategies (OS) of the M-TES with different transportation schemes were compared. Moreover, the economic assessment was performed based on the project's net present value (NPV) and payback period (PBP). The OS with 6 trips per day is the most profitable with pay-back time of about 2, 3 and 5 years if the waste heat costs at the level of 0 epsilon/MWh, 3300 epsilon/MWh, and 6600 epsilon/MWh, respectively.
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| 2. |
- Guo, Shaopeng, et al.
(författare)
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Mobilized thermal energy storage for clean heating in carbon neutrality era : A perspective on policies in China
- 2022
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Ingår i: Energy and Buildings. - : ELSEVIER SCIENCE SA. - 0378-7788 .- 1872-6178. ; 277
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Tidskriftsartikel (refereegranskat)abstract
- Mobilized thermal energy storage (M-TES) is a promising technology to transport heat without the lim-itation of pipelines, therefore suitable for collecting distributed renewable or recovered resources. In par-ticular, the M-TES can be flexibly used for the emergency heating in the COVID-19 era. Though the M-TES has been commercializing in China, there is not any specific regulation or standard for M-TES systems. Therefore, this paper summarizes and discusses the existing regulations and policies concerning M-TES in the aspects of facility manufacture and operation, road transportation, and financial support and guidance. Furthermore, the suggestions were presented including necessary consensus on the devel-opment of M-TES among different departments, consideration of local conditions when drafting or revis-ing regulations and policies, sufficient investment, or subsidy on the R&D of M-TES, and qualification recognition of M-TES companies and staffs.
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| 3. |
- Guo, Shaopeng, et al.
(författare)
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Numerical simulation study on optimizing charging process of the direct contact mobilized thermal energy storage
- 2013
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Ingår i: Applied Energy. - : Elsevier BV. - 0306-2619 .- 1872-9118. ; 112, s. 1416-1423
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Tidskriftsartikel (refereegranskat)abstract
- Mobilized thermal energy storage (M-TES) system is considered as an attractive alternative to supply heat to distributed heat users, especially when the waste heat from industries is used as a heat source. From our previous study it was known that the charging time of M-TES system was more than four times of the discharging time, which was a critical issue for the application of M-TES. To improve the charging performance of the system and further understand the mechanism of melting process, a 2-dimensional (2D) numerical simulation model was developed in ANSYS FLUENT. The model was validated by the experimental measurements. The results showed that the model could be used for the engineering analysis. With the validated model, different options to shorten the charging time were investigated including increasing flow rate of thermal oil, creating channels before charging and adding wall heating. Correspondingly, around 25%, 26% and 29% of the charging time could be reduced respectively compared to the experiment with a thermal oil flow rate of 9.8. L/min, according to the numerical simulation. In addition, if the last two options could be applied simultaneously, more than half of the melting time might be shortened without changing the flow rate of thermal oil.
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| 4. |
- Guo, Shaopeng, et al.
(författare)
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Numerical study of the improvement of an indirect contact mobilized thermal energy storage container
- 2016
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Ingår i: Applied Energy. - : Elsevier. - 0306-2619 .- 1872-9118. ; 161, s. 476-486
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the melting and solidification behaviours of the PCM in an indirect contact mobilized thermal energy storage (ICM-TES) container were numerically investigated to facilitate the further understanding of the phase change mechanism in the container. A 2D model was built based on the simplification and assumptions of experiments, which were validated by comparing the results of computations and measurements. Then, three options, i.e., a high thermal conductivity material (expanded graphite) addition, the tube diameter and the adjustment of the internal structure of the container and fin installation, were analyzed to seek effective approaches for the improvement of the ICM-TES performance. The results show that the optimal parameters of the three options are 10 vol.% (expanded graphite proportion), 22 mm (tube diameter) and 0.468 m(2) (fin area). When the three options are applied simultaneously, the charging time is reduced by approximately 74% and the discharging time by 67%.
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| 5. |
- Guo, Shaopeng, et al.
(författare)
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Techno-economic assessment of mobilized thermal energy storage for distributed users : A case study in China
- 2017
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Ingår i: Applied Energy. - : ELSEVIER SCI LTD. - 0306-2619 .- 1872-9118. ; 194, s. 481-486
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Tidskriftsartikel (refereegranskat)abstract
- The mobilized thermal energy storage (M-TES) system is a promising alternative to conventional heating systems to meet the heat demand for distributed users. This paper provided a techno-economic assessment of the M-TES system based on a case study in China. According to the analysis of the design specifications of the heating system, the suitability of matching the M-TES with existing heating systems was analyzed. The results show that the M-TES is appropriate for use with heating systems with a fan-coil unit and under-floor pipe. Containers and operating strategies for the M-TES with different transportation schemes were also designed. The maximum allowed load of the M-TES container is 39 t according to the discussion of transportation regulations on the road. The cost and income of the M-TES in the study case were estimated, and the net present value (NPV) and payback period (PBP) were also calculated. The best operating strategy is the use of 2 containers and 4 cycles of container transportation per day, with a PBP of approximately 10 years. The M-TES is applicable for middle and small-scale heat users in China.
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| 6. |
- Wang, W., et al.
(författare)
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Experimental study on the direct/indirect contact energy storage container in mobilized thermal energy system (M-TES)
- 2014
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Ingår i: Applied Energy. - : Elsevier BV. - 0306-2619 .- 1872-9118. ; 119, s. 181-189
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Tidskriftsartikel (refereegranskat)abstract
- A mobilized thermal energy storage (TES) system has been proposed to recover and use industrial waste or excess heat for distributed users. In this paper, lab-scale test facilities have been built to understand the mechanisms of heat charging and discharging processes. The facilities consist of a direct/indirect-contact thermal energy storage container, heat transfer oil (HTO)/water tanks, an electrical boiler, HTO/water pumps and a plate heat exchanger. The organic phase change material (PCM), erythritol, which is sugar alcohol, was chosen as the working material due to its large heat density (330. kJ/kg) and suitable melting point (118. °C) for industrial low-temperature heat recovery, as well as non toxic and corrosive. Although differential scanning calorimetry tests have shown that a large temperature range exists during the phase change of erythritol, it did not affect the heat discharging during the tests of system performance. Heat charging/discharging results show that for the direct-contact storage container, heat discharging process is much faster than charging process. At the initial stage of heat charging, heat transfer oil is blocked to enter the container, resulting in a slow charging rate. Meanwhile, the PCM attached on the container wall on the bottom always melts last. It has been found that increasing the flow rate of HTO can effectively enhance the charging/discharging processes. For the indirect-contact storage container, heat charging and discharging take almost the same time; and the flow rate of HTO does not show an obvious effect on the charging and discharging processes due to the weak thermal conductivity of the solid phase change material. Comparatively, using the direct-contact storage container may achieve shorter charging/discharging processes than using the indirect-contact storage container.
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