Computational/Theoretical Modeling of Flow Physics and Transport in Disk Rotor Drag Turbine Expanders for Green Energy Conversion Technologies

2010 ◽  
Author(s):  
Van P. Carey
Keyword(s):  
Energy Conversion ◽  
Capital Investment ◽  
Waste Heat ◽  
Low Cost ◽  
Green Energy ◽  
Hot Water ◽  
Cfd Modeling ◽  
Modeling And Analysis ◽  
Energy Applications ◽  
Advantages And Disadvantages

This paper explores the theoretical and computational challenges associated with modeling of flow, momentum transport, and energy conversion processes in disk rotor drag turbine expanders. This category of expander devices, also known as Tesla turbines, has distinct advantages for Rankine power generation using low temperature heat from renewable source such as solar, waste heat, or geothermal steam or hot water. Specifically, the nozzle and rotor designs and the overall expander can be simple to manufacture, low cost, and durable, making this type of expander an attractive option in green energy technology applications where low maintenance costs and rapid capital investment payback are important qualities. Efficient energy conversion performance in rotor disk drag expanders requires that the nozzle efficiently convert flow exergy to fluid kinetic energy, and the rotor be designed to efficiently convert fluid angular momentum to shaft torque and power. To achieve these goals, modeling and analysis tools must provide the designer with a means to predict the performance of these components that accurately represents the physics, and can be effectively used to illuminate the parametric trends in performance. Two categories of modeling are examined in this paper: (1) computational fluid dynamics (CFD) modeling, and (2) more idealized one- and two-dimensional analysis frameworks. The advantages and disadvantages of these two approaches are examined here for the specific flows of interest in this type of expander design. The implications of model predictions for optimal design of disk rotor expanders for green energy applications are also discussed.

Performance of Air Conditioners With Commercial Desuperheaters: A Green Energy Project as an Undergraduate Research

2009 ◽  
Author(s):  
Emin Yilmaz ◽  
Abhijit Nagchaudhuri
Keyword(s):  
Data Acquisition ◽  
Water Temperature ◽  
Heat Pump ◽  
Waste Heat ◽  
Mechanical Systems ◽  
Green Energy ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Design Project ◽  
Heating Mode

The goal of the design project titled “Domestic Hot Water Heater Using Air Conditioner Waste Heat” was to introduce students to designing mechanical systems in the “ETME475-Mechanical Systems Design” course. Two students completed the design project in spring 2007. Some test runs were conducted with a commercial desuperheater to measure the efficiency of the unit and its effect on the Coefficient of Performance (COP) of the Heat Pump when the heat pump is operated in air conditioning (A/C) mode. Contrary to author’s expectations, results indicated that, COP values were reduced by about 22%. Measured efficiency of the desuperheater was about 18% [1]. The current project is an extension of the original project with the new National Instruments data acquisition board, a newly developed LabVIEW data acquisition program, and with a more realistic heat transfer loop. The study covers performance of the heat pump operating in A/C mode as well as in heating mode. Results indicate, depending on the water temperature in the desuperheater, heat pump COP dropped 6–17% in A/C mode and 8–38% in heating mode. Again depending on the average water temperature in the ECU, the ECU efficiencies ranged from 12% to 27% for cooling and 11% to 39% for heating.

scholarly journals Impact of Waste Heat Recovery of Chimney Using U-Shaped Pulsating Heat Pipe to Generate Hot Water- Experimental and Environmental Analysis

2021 ◽  
Author(s):  
Shahin Shoeibi ◽  
Hadi Kargarsharifabad ◽  
Mohammad Mehdi Rashidi
Keyword(s):  
Heat Pipe ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Hot Water ◽  
Pulsating Heat Pipe ◽  
Waste Heat Recovery System ◽  
Energy Applications ◽  
Water Chamber ◽  
Exhaust Duct

Abstract Many studies have been done on the Pulsating heat pipes (PHP) using energy applications system. In this study a heat exchanger PHP is analyzed. A heat pipe prototype is manufactured for waste heat recovery. The present study experimentally investigated the effect of pulsating heat pipe on the waste heat recovery of the chimney and produce hot water for household consumption. The evaporator is placed in a smoke exhaust duct and the condenser is located in a water chamber in which the smoke heat is transferred through. The results are presented for different heat pipe angles to the horizon from 0 to 90. The PHP is filled 60% by distilled water as operating fluid. The highest hot water temperature in outlet of reservoir was about to 58 oC. Also, The CO2 mitigation and CPH of the waste heat recovery system was equal to 84.82 tons and 0.1$/m3. Moreover, the efficiency is changing from 19% for a horizontal PHP to 54% for a vertical one.

scholarly journals A Brief Note on the Heap Leaching Technologies for the Recovery of Valuable Metals

2019 ◽  
Vol 11 (12) ◽  
pp. 3347 ◽  
Author(s):  
Thriveni Thenepalli ◽  
Ramakrishna Chilakala ◽  
Lulit Habte ◽  
Lai Quang Tuan ◽  
Chun Sik Kim
Keyword(s):  
Low Cost ◽  
Precious Metals ◽  
Heap Leaching ◽  
Green Energy ◽  
Environmental Benefits ◽  
Energy Applications ◽  
Leaching Process ◽  
Attractive Option ◽  
Industrial Mining ◽  
The Cost

Heap leaching is a low-cost technology used in industrial mining to recover precious metals such as gold and uranium, along with several other highly sought after metals like copper, from their primary resources (ores and minerals). For many decades, there has been a growing demand for heap leaching due to its environmental benefits. Heap leaching provides mining operators with a benign, effective and economical solution for the environment and produces only minor emissions from furnaces. The cost of the heap leaching process is low, making this process an attractive option from a financial standpoint. Here, we shall present a brief review of the heap leaching process when applied to the extraction of different metals from primary resources (ores and minerals). This paper presents a roadmap to satisfy future national demands for rare earth elements (REEs). This heap leaching process is applicable for the recovery of REEs from secondary resources such as mining and coal residues. Heap leaching plays a significant role in the recovery of critical elements which are used in clean and green energy applications. In the mining sector, heap leaching is a distinguished method for the recovery of valuable/beneficial metals from low-quality ore. In the present study, we shall report briefly on the heap leaching technologies for valuable metal recovery with economic advantages.

Design of a Four-Effect Desalination Demonstration Plant Using Waste Heat from a Diesel Engine

2014 ◽  
Vol 955-959 ◽  
pp. 3400-3403
Author(s):  
Feng Ming Zhang ◽  
Dong Dong Feng ◽  
Wei Yang ◽  
Xiao Bin Pei ◽  
Shun Quan Chen ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Diesel Engine ◽  
Waste Heat ◽  
Low Cost ◽  
Water Yield ◽  
Operating Condition ◽  
Advantages And Disadvantages ◽  
Demonstration Plant

The advantages and disadvantages of the conventional desalination methods were discussed. A four-effect desalination demonstration plant using waste heat from a diesel engine was designed. Not only the water yield but also the physical dimension of the distiller has been calculated under the operating condition. The analysis of energy consumption shows that the desalination system is low-cost.

scholarly journals Waste heat utilisation for cogeneration of energy

Mechanik ◽  
2017 ◽  
Vol 90 (3) ◽  
pp. 254-256 ◽  
Author(s):  
Robert Zarzycki ◽  
Marcin Panowski
Keyword(s):  
Power Plant ◽  
Energy Conversion ◽  
Heat Pump ◽  
Waste Heat ◽  
Cooling System ◽  
Hot Water ◽  
Absorption Heat Pump ◽  
Start Up ◽  
Heat Demand

The paper shows the analysis of potential of absorption heat pump (APC) application to increase the efficiency of source energy conversion in the cogeneration power plant, by recuperation of waste heat from oil cooling system. In the presented case, the purpose of APC implementation was to eliminate the number of start up of pick hot water boilers. Obtained results showed that the waste heat may be utilised during the highest heat demand which may lead to delay or even avoiding the pick boiler start up, owing to absorption heat pump implementation.

scholarly journals Local Heating Networks with Waste Heat Utilization: Low or Medium Temperature Supply?

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 954 ◽  
Author(s):  
Hanne Kauko ◽  
Daniel Rohde ◽  
Armin Hafner
Keyword(s):  
Low Temperature ◽  
Heat Pump ◽  
Urban Areas ◽  
Waste Heat ◽  
Local Heating ◽  
District Heating ◽  
Heat Pumps ◽  
Hot Water ◽  
Local Network ◽  
Medium Temperature

District heating enables an economical use of energy sources that would otherwise be wasted to cover the heating demands of buildings in urban areas. For efficient utilization of local waste heat and renewable heat sources, low distribution temperatures are of crucial importance. This study evaluates a local heating network being planned for a new building area in Trondheim, Norway, with waste heat available from a nearby ice skating rink. Two alternative supply temperature levels have been evaluated with dynamic simulations: low temperature (40 °C), with direct utilization of waste heat and decentralized domestic hot water (DHW) production using heat pumps; and medium temperature (70 °C), applying a centralized heat pump to lift the temperature of the waste heat. The local network will be connected to the primary district heating network to cover the remaining heat demand. The simulation results show that with a medium temperature supply, the peak power demand is up to three times higher than with a low temperature supply. This results from the fact that the centralized heat pump lifts the temperature for the entire network, including space and DHW heating demands. With a low temperature supply, heat pumps are applied only for DHW production, which enables a low and even electricity demand. On the other hand, with a low temperature supply, the district heating demand is high in the wintertime, in particular if the waste heat temperature is low. The choice of a suitable supply temperature level for a local heating network is hence strongly dependent on the temperature of the available waste heat, but also on the costs and emissions related to the production of district heating and electricity in the different seasons.

scholarly journals RELaTED Project: New Developments on Ultra-Low Temperature District Heating Networks

Proceedings ◽  
2020 ◽  
Vol 65 (1) ◽  
pp. 25
Author(s):  
Antonio Garrido Marijuan ◽  
Roberto Garay ◽  
Mikel Lumbreras ◽  
Víctor Sánchez ◽  
Olga Macias ◽  
...  
Keyword(s):  
Low Temperature ◽  
High Performance ◽  
Waste Heat ◽  
District Heating ◽  
Hot Water ◽  
Thermal Systems ◽  
Heating Source ◽  
Wide Range ◽  
Thermal Sources ◽  
Heating Networks

District heating networks deliver around 13% of the heating energy in the EU, being considered as a key element of the progressive decarbonization of Europe. The H2020 REnewable Low TEmperature District project (RELaTED) seeks to contribute to the energy decarbonization of these infrastructures through the development and demonstration of the following concepts: reduction in network temperature down to 50 °C, integration of renewable energies and waste heat sources with a novel substation concept, and improvement on building-integrated solar thermal systems. The coupling of renewable thermal sources with ultra-low temperature district heating (DH) allows for a bidirectional energy flow, using the DH as both thermal storage in periods of production surplus and a back-up heating source during consumption peaks. The ultra-low temperature enables the integration of a wide range of energy sources such as waste heat from industry. Furthermore, RELaTED also develops concepts concerning district heating-connected reversible heat pump systems that allow to reach adequate thermal levels for domestic hot water as well as the use of the network for district cooling with high performance. These developments will be demonstrated in four locations: Estonia, Serbia, Denmark, and Spain.

Emerging Technologies for Green Energy Conversion and Storage

2021 ◽  
Vol 5 (3) ◽  
pp. 2000152
Author(s):  
Qian Zhang ◽  
Lakshmi Suresh ◽  
Qijie Liang ◽  
Yaoxin Zhang ◽  
Lin Yang ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Emerging Technologies ◽  
Green Energy ◽  
Energy Conversion And Storage ◽  
And Storage

scholarly journals Titanium Nitride Nanodonuts Synthesized from Natural Ilmenite Ore as a Novel and Efficient Thermoplasmonic Material

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 76
Author(s):  
Thanh-Lieu Thi Le ◽  
Lam Tan Nguyen ◽  
Hoai-Hue Nguyen ◽  
Nguyen Van Nghia ◽  
Nguyen Minh Vuong ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Low Cost ◽  
Visible Region ◽  
Resonance Absorption ◽  
Solar Light ◽  
Localized Surface Plasmon ◽  
Water Evaporation ◽  
Energy Applications ◽  
Simulated Solar Light ◽  
New Class

Nanostructures of titanium nitride (TiN) have recently been considered as a new class of plasmonic materials that have been utilized in many solar energy applications. This work presents the synthesis of a novel nanostructure of TiN that has a nanodonut shape from natural ilmenite ore using a low-cost and bulk method. The TiN nanodonuts exhibit strong and spectrally broad localized surface plasmon resonance absorption in the visible region centered at 560 nm, which is well suited for thermoplasmonic applications as a nanoscale heat source. The heat generation is investigated by water evaporation experiments under simulated solar light, demonstrating excellent solar light harvesting performance of the nanodonut structure.

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