Heat Storage and Release Characteristics of Plate type Heat Exchanger with Thermal Storage to the Flow Rate of Waste Heat Water

2019 ◽  
Vol 31 (6) ◽  
pp. 237-245
Author(s):  
Donghyun Kim ◽  
Donggyu Lee ◽  
Dong-Yeol Chung ◽  
Jong-Hyeon Peck ◽  
Chaedong Kang
Keyword(s):  
Heat Exchanger ◽  
Flow Rate ◽  
Heat Storage ◽  
Waste Heat ◽  
Thermal Storage ◽  
Plate Type

Heat Storage and Release Characteristics of Heat Storage Double Shell and Tube Heat Exchanger with Waste Heat Water Temperature

2018 ◽  
Vol 30 (10) ◽  
pp. 462-469
Author(s):  
Geunmyeun Jeong ◽  
Donghyun Kim ◽  
Donggyu Lee ◽  
Dong-Yeol Chung ◽  
Jong-Hyeon Peck ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Water Temperature ◽  
Heat Storage ◽  
Waste Heat ◽  
Tube Heat Exchanger ◽  
Shell And Tube

scholarly journals Variable versus Constant Flow Performance Investigations for Photovoltaic-Thermal Panels

2021 ◽  
Author(s):  
Tamo Dembeck-Kerekes
Keyword(s):  
Heat Exchanger ◽  
Flow Rate ◽  
Thermal Efficiency ◽  
Storage Tank ◽  
Heat Removal ◽  
Thermal Storage ◽  
Simulation Method ◽  
Published Data ◽  
Ambient Conditions ◽  
Steady State Model

A quasi-steady-state model has been developed to evaluate of the potential of variable flow strategies to improve the overall thermal efficiency of Photovoltaic Thermal (PVT) collectors. An adaption of the Duffie-Beckman method is used to simulate the PVT in which the overall loss coefficient and heat removal factor are updated at each timestep in response to changes in flow rate and ambient conditions. A novel simulation method was developed to simulate a building heating loop connected to the solar loop via a thermal storage tank or counterflow heat exchanger. The model was validated with published data and with a parallel TRNSYS simulation. The results of the investigation show that optimizing flow rate has significant potential to improve thermal efficiency. This benefit was found to be dependant on ambient and process loop conditions, and was limited to the counterflow heat exchanger case rather than that with a thermal storage tank.

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.

A Variable Effectiveness Model for Indirect Thermal Storage Devices

2005 ◽  
Author(s):  
A. M. Boies ◽  
K. O. Homan ◽  
J. H. Davidson ◽  
Wei Liu
Keyword(s):  
Energy Transfer ◽  
Heat Exchanger ◽  
Flow Rate ◽  
Temperature Difference ◽  
Empirical Data ◽  
Thermal Storage ◽  
Convection Flow ◽  
Discharge Process ◽  
Initial Flow ◽  
Effectiveness Model

The performance of indirect thermal storage systems is critically dependent on the degree of thermal contact between the energy storage medium and the energy transfer medium. For liquid-liquid systems, the energy transfer occurs across a heat exchanger for which the overall effectiveness is determined by both tube-side and storage-side convection coefficients. While the tube-side convection is essentially constant throughout a draw at a constant flow rate, the storage-side convection process depends intimately on the natural convection flow driven by the temperature difference between the two fluids. This temperature difference is inherently transient during the discharge process. In the present work, analytical models are developed which predict system behavior for constant and variable heat exchanger effectiveness. The accuracy of each model is quantified in relation to empirical data obtained by Liu et al. [1, 2] in a physical system motivated by application to integral collector storage (ICS) solar water heating devices. From analysis of the empirical data, discharge-averaged values in the constant effectiveness model and in the variable effectiveness model are determined for a range of empirical conditions. The results show that the initial flow transients generated by the start of the discharge process are flow rate dependent and have a significant impact on the observed overall heat transfer coefficients.

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.

scholarly journals Dynamic numerical study on phase change thermal storage heat transfer

2021 ◽  
Vol 25 (6 Part A) ◽  
pp. 4171-4179
Author(s):  
Jie Cui ◽  
Guofeng Wang ◽  
Zhitang Guo ◽  
Shuo Yang ◽  
Honggang Pan ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Phase Change ◽  
Phase Change Material ◽  
Heat Storage ◽  
Thermal Storage ◽  
Transfer Effect ◽  
Fin Spacing ◽  
Change Material

Targeted at the poor heat transfer effect of the phase change thermal storage heat exchanger due to the low thermal conductivity of the phase change material, a fin-tube type phase change thermal storage heat exchanger has been proposed in the study. A 2-D model of the phase-change heat storage unit was established, and the dynamic heat transfer law of the melting and solidification of the phase change material, and the influence of the fin structure size on the heat storage/release performance of the heat exchanger were numerically analyzed. The results show that in the area close to the tube wall, the smaller the fin spacing, the larger the thickness, the faster the phase change heat storage/release speed, and the better heat transfer effect. In the central area of the phase change material, the greater the fin spacing and thickness, and the better the heat transfer effect of the phase change heat storage/release. The area close to the outer wall has the smallest temperature change, and the heat storage/release effect is the worst. Therefore, the use of energy storage heat exchangers with gradual fin thickness and spacing is an effective method to improve the heat transfer efficiency of existing equipment. In addition, in order to improve the heat exchange effect of the edge area of the phase change, its structure could be changed or the heat exchange form can be increased.

Determination of Optimum Concentration of Nanofluid for Process Intensification of Heat Transfer Using Corrugated Plate Type Heat Exchanger

2018 ◽  
Vol 14 (1) ◽  
Author(s):  
Vijaya Kumar Talari ◽  
Sunil Kumar Thamida ◽  
R. C. Sastry
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Flow Rate ◽  
Heat Exchangers ◽  
Process Intensification ◽  
Optimum Concentration ◽  
Critical Flow ◽  
Hydraulic Power ◽  
Critical Flow Rate ◽  
Plate Type

Abstract In this study cooling of hot water is taken up using a compact heat exchanger such as corrugated plate type heat exchanger and with utility fluid as a nanofluid prepared from mixing Al2O3 in water. In general a monotonic increase of 30 % to 70 % in overall heat transfer coefficient is observed for increase in nanofluid concentration as well as its flow rate. An optimum concentration of nanofluid is hence not possible to be found as heat transfer coefficient exhibited a monotonic trend. But there is a penalty for using nanofluid of higher concentrations in heat exchangers in the form of additional hydraulic power required to supply the nanofluid due its higher viscosity. Hence, as a novel approach, a target temperature drop of 15 °C for hot fluid (with constant flow rate) is assumed and the minimum critical flow rate of cold nanofluid of various concentrations required for achieving this is determined using simulation. For such a critical flow rate at various nanofluid concentrations, the determined hydraulic power (product of pressure drop and flow rate) exhibited a global minimum around 0.75 % volume concentration of Al2O3 in water. Thus this article presents the process intensification procedure for the heat exchangers using nanofluids as heat transfer enhancement option.

scholarly journals Variable versus Constant Flow Performance Investigations for Photovoltaic-Thermal Panels

2021 ◽  
Author(s):  
Tamo Dembeck-Kerekes
Keyword(s):  
Heat Exchanger ◽  
Flow Rate ◽  
Thermal Efficiency ◽  
Storage Tank ◽  
Heat Removal ◽  
Thermal Storage ◽  
Simulation Method ◽  
Published Data ◽  
Ambient Conditions ◽  
Steady State Model

A quasi-steady-state model has been developed to evaluate of the potential of variable flow strategies to improve the overall thermal efficiency of Photovoltaic Thermal (PVT) collectors. An adaption of the Duffie-Beckman method is used to simulate the PVT in which the overall loss coefficient and heat removal factor are updated at each timestep in response to changes in flow rate and ambient conditions. A novel simulation method was developed to simulate a building heating loop connected to the solar loop via a thermal storage tank or counterflow heat exchanger. The model was validated with published data and with a parallel TRNSYS simulation. The results of the investigation show that optimizing flow rate has significant potential to improve thermal efficiency. This benefit was found to be dependant on ambient and process loop conditions, and was limited to the counterflow heat exchanger case rather than that with a thermal storage tank.

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