Reduced Order Heat Exchanger Models for Low-to-Medium Temperature Range Solar Thermal Applications

2018 ◽  
pp. 357-393 ◽  
Author(s):  
Rudrodip Majumdar ◽  
Sandip K. Saha
Keyword(s):  
Heat Exchanger ◽  
Solar Thermal ◽  
Medium Temperature ◽  
Reduced Order ◽  
Temperature Range ◽  
Solar Thermal Applications

Numerical design and studies of multipurpose concentrated solar thermal heating system

2021 ◽  
pp. 1-38
Author(s):  
Bandi Sai Mukesh ◽  
Sudipto Mukhopadhyay ◽  
Ashish Mondal ◽  
Laltu Chandra
Keyword(s):  
Heat Exchanger ◽  
Heating System ◽  
Solar Thermal ◽  
Thermal Heating ◽  
Solar Thermal Energy ◽  
Thermal Systems ◽  
Medium Temperature ◽  
Sustainable Solutions ◽  
Direct Normal Irradiance ◽  
Industrial Use

Abstract Solar thermal energy systems are future sustainable solutions for both domestic as well as industrial use. Solar thermal systems operating in medium temperature range (373-673 K) require concentrated solar-thermal heating (CSH). In this work, a comprehensive numerical tool is developed to design and study multipurpose on-sun CSH system. The model uses a combined Monte-Carlo ray tracing, finite difference method and all heat transfer modes. The model is validated with in-house experiment, which demonstrates its predictive capability. Next, the tool is used to optimise the cavity receiver geometry and predict the performance of the optimised CSH system under different direct normal irradiance (DNI) conditions. A CSH system using Therminol D12 as HTF is presented. Therminol D12 HTF based system is predicted to take longer time than the system using water as HTF, for heating water to a specified temperature because of the heat exchanger effectiveness. However, the designed CSH system using Therminol D12 can attain higher temperatures than water without pressurization and through the heat exchanger can be used as multipurpose system suitable for cooking, laundry, sterilization, process industry etc.

Efficient stationary solar thermal collector systems operating at a medium-temperature range

2013 ◽  
Vol 111 ◽  
pp. 1071-1079 ◽  
Author(s):  
Yong Sin Kim ◽  
Kevin Balkoski ◽  
Lun Jiang ◽  
Roland Winston
Keyword(s):  
Solar Thermal ◽  
Medium Temperature ◽  
Temperature Range ◽  
Solar Thermal Collector

scholarly journals Experimental Investigation of a Medium Temperature Single-Phase Thermosyphon in an Evacuated Tube Receiver Coupled With Compound Parabolic Concentrator

2021 ◽  
Vol 9 ◽  
Author(s):  
Javed Akhter ◽  
S. I. Gilani ◽  
Hussain H. Al-Kayiem ◽  
Mubbashar Mehmood ◽  
Muzaffar Ali ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Energy ◽  
Single Phase ◽  
Solar Thermal ◽  
Heat Transfer Fluid ◽  
Outlet Temperature ◽  
Solar Thermal Energy ◽  
Medium Temperature ◽  
Temperature Range ◽  
Evacuated Tube

The integration of evacuated tube receivers with non-imaging compound parabolic concentrators (CPCs) operating in thermosyphon mode provides the opportunity to deliver solar thermal energy in the medium temperature range that is suitable for many industrial applications. However, the performance of single-phase thermosyphon in the medium temperature range has not been comprehensively investigated. This paper presents the design, development, and performance evaluation of a single-phase thermosyphon in an evacuated tube receiver integrated with a modified CPC solar collector. The thermohydraulic performance of the developed system is evaluated in the tropical climate using Therminol-55 oil as heat transfer fluid. The results demonstrate that the maximum outlet temperature reached over 120°C using thermal oil as heat transfer fluid while it remained at 100°C in case of water. The zero-loss thermal efficiency reached up to 70% on a clear sky day. Comparing the thermal performance of the developed CPC collector with an existing model of a non-concentrating collector showed much improvement at elevated temperatures. This indicates that this system can effectively operate in tropical weather conditions to provide sustainable solar thermal energy in the medium temperature range.

scholarly journals Modification of a Solar Thermal Collector to Promote Heat Transfer inside an Evacuated Tube Solar Thermal Absorber

2021 ◽  
Vol 11 (9) ◽  
pp. 4100
Author(s):  
Rasa Supankanok ◽  
Sukanpirom Sriwong ◽  
Phisan Ponpo ◽  
Wei Wu ◽  
Walairat Chandra-ambhorn ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Solar Thermal ◽  
Heat Transfer Fluid ◽  
Small Scale ◽  
Medium Temperature ◽  
Change Behavior ◽  
Set Up ◽  
Evacuated Tube ◽  
Heating Medium

Evacuated-tube solar collector (ETSC) is developed to achieve high heating medium temperature. Heat transfer fluid contained inside a copper heat pipe directly affects the heating medium temperature. A 10 mol% of ethylene-glycol in water is the heat transfer fluid in this system. The purpose of this study is to modify inner structure of the evacuated tube for promoting heat transfer through aluminum fin to the copper heat pipe by inserting stainless-steel scrubbers in the evacuated tube to increase heat conduction surface area. The experiment is set up to measure the temperature of heat transfer fluid at a heat pipe tip which is a heat exchange area between heat transfer fluid and heating medium. The vapor/ liquid equilibrium (VLE) theory is applied to investigate phase change behavior of the heat transfer fluid. Mathematical model validated with 6 experimental results is set up to investigate the performance of ETSC system and evaluate the feasibility of applying the modified ETSC in small-scale industries. The results indicate that the average temperature of heat transfer fluid in a modified tube increased to 160.32 °C which is higher than a standard tube by approximately 22 °C leading to the increase in its efficiency by 34.96%.

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