scholarly journals Critical Analysis of the Current State of Knowledge in the Field of Waste Heat Recovery in Sewage Systems

Resources ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 72
Author(s):  
Beata Piotrowska ◽  
Daniel Słyś ◽  
Sabina Kordana-Obuch ◽  
Kamil Pochwat
Keyword(s):  
Critical Analysis ◽  
Water Reuse ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Residential Buildings ◽  
Alternative Source ◽  
Current State ◽  
Gray Water ◽  
Low Efficiency

The need for efficient use of energy and sustainable energy management and the fact that large quantities of heat are deposited in the discharged sewage have contributed to the development of research on waste heat recovery. Gray water began to be seen not just as waste, but also as an alternative source of energy. Research related to the development, improvement, and finally, the popularization of waste energy recovery devices and systems has evolved rapidly over the last two decades. Initially, technologies for gray water reuse were not widely used, which was due to the low efficiency of the current heat exchangers and the significant investment outlays that would have to be covered by potential users. Research conducted by scientists from around the world has allowed us to eliminate construction flaws, improve efficiency, and also provide information on the selection of optimal waste heat recovery technology, depending on the installation conditions and operating parameters. The ability to correctly select the device allows for effective energy collection from gray water, which improves the investment profitability. This paper reviews the research regarding issues related to waste heat recovery from gray water in sewage installations and systems. A critical analysis of the current state of knowledge was carried out with a special consideration to the technologies intended for the residential buildings.

A New Energy Frugal Paradigm for Data Centers

2010 ◽  
Author(s):  
Adrienne B. Little ◽  
Srinivas Garimella
Keyword(s):  
Energy Consumption ◽  
Data Center ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Data Centers ◽  
Waste Heat ◽  
Residential Buildings ◽  
Integrated Approach ◽  
The United States ◽  
Primary Energy

Of the total electricity consumption by the United States in 2006, more than 1% was used on data centers alone; a value that continues to rise rapidly. Of the total amount of electricity a data center consumes, at least 30% is used to cool server equipment. The present study conceptualizes and analyzes a novel paradigm consisting of integrated power, cooling, and waste heat recovery and upgrade systems that considerably lowers the energy footprint of data centers. Thus, on-site power generation equipment is used to supply primary electricity needs of the data center. The microturbine-derived waste heat is recovered to run an absorption chiller that supplies the entire cooling load of the data center, essentially providing the requisite cooling without any additional expenditure of primary energy. Furthermore, the waste heat rejected by the data center itself is boosted to a higher temperature with a heat transformer, with the upgraded thermal stream serving as an additional output of the data center with no additional electrical power input. Such upgraded heat can be used for district heating applications in neighboring residential buildings, or as process heat for commercial end uses such as laundries, hospitals and restaurants. With such a system, the primary energy usage of the data center as a whole can be reduced by about 23 percent while still addressing the high-flux cooling loads, in addition to providing a new income stream through the sales of upgraded thermal energy. Given the large and fast-escalating energy consumption patterns of data centers, this novel, integrated approach to electricity and cooling supply, and waste heat recovery and upgrade will substantially reduce primary energy consumption for this important end use worldwide.

IMPROVING INDUSTRIAL ENERGY EFFICIENCY THROUGH THE IMPLEMENTATION OF WASTE HEAT RECOVERY SYSTEMS

2015 ◽  
Vol 39 (1) ◽  
pp. 125-136 ◽  
Author(s):  
Kristine O’Rielly ◽  
Jack Jeswiet
Keyword(s):  
Energy Efficiency ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Economic Benefits ◽  
Makeup Water ◽  
Current State ◽  
Industrial Energy ◽  
Wide Scale ◽  
Industrial Energy Efficiency

Improving the energy efficiency of industrial processes and the facilities in which they are carried out is often considered to be one of the most promising ways to begin reducing global greenhouse gas emissions. One of the best ways for organizations to reduce their energy consumption without having to carry out extensive equipment and facility overhauls is waste heat recovery or energy recycling. Waste heat recovery involves tapping into previously discarded thermal energy streams and reusing it for various purposes within a facility (space heating or cooling) or within the process itself (pre-heating air and boiler makeup water). Despite the numerous social and economic benefits that are available through waste heat recovery, several economic and technical barriers still exist to its wide-scale implementation. This paper provides an overview of the current state of waste heat recovery systems available in industry, offers a discussion of the major barriers to their wide-spread implementation, and lastly concludes with new data with several new case studies from Canadian manufacturers which have successfully harnessed waste heat within their facilities.

scholarly journals Thermodynamic Optimization of an Air bottoming Cycle for Waste Heat Recovery from Preheater Tower in a Cement Industry

2021 ◽  
Vol 03 (01) ◽  
pp. 97-103
Author(s):  
Youcef Redjeb ◽  
◽  
Khatima Kaabeche-Djerafi ◽  
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Electrical Energy ◽  
Cement Industry ◽  
Water Deficiency ◽  
Power Maximization ◽  
Low Efficiency ◽  
Net Power Output

This work evaluated the air bottoming cycles(ABC) as a technology for waste heat recovery (WHR) at the level of the preheater tower in a cement industry. An optimization code has been developed in MATLAB environment and linked with REFPROP database as a way to design and calculate the different parameters and points of the cycle. The theory of power maximization is adopted and the genetic algorithm is employedasa way to maximize the net power output of the cycle, while a case study of a real cement plant has been taken into consideration for the examination purpose. Results showed that the integration of the ABC cycle for energy valorization contributes to covering around 8.5% of the industry need for electrical energy, by generating an amount of power that can achieve 1.07 MW.In addition, although the cycle has shown a low efficiency, it can be a practical WHR solution especially in case of water deficiency.

The Performance of a Segmented Thermoelectric Convertor Using Yb-Based Filled Skutterudites and Bi2Te3-Based Materials

2001 ◽  
Vol 691 ◽  
Author(s):  
Kakuei Matsubara
Keyword(s):  
Heat Exchanger ◽  
Research Program ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Gasoline Engine ◽  
Waste Heat ◽  
Preliminary Test ◽  
Current State ◽  
Filled Skutterudites ◽  
Thermoelectric Convertor

ABSTRACTThis paper reports an overview of the current state in our research program started in 1995 in collaboration with industries. This program has been aimed at making sure of the feasibility of a thermoelectric convertor for waste heat recovery of gasoline engine vehicle. Major results obtained include: (1) updated ZT-values for Pd,Pt-doped CoSb3 and partially Yb-filled skutterudite antimonides YbyM4Sb12 (M=Co, Fe, Ni; 0<y<1), (2) the performance of thermoelectric convertor using a segmented module of the skutterudites and Bi2Te3-based alloys, (3) a preliminary test of a thermoelectric stack which is the united device of thermoelectric modules and heat exchanger, when properly installed in a 2000cc class automobile.

EXPERIMENTAL INVESTIGATION OF HEAT PIPE HEAT EXCHANGER (HPHE) FOR WASTE HEAT RECOVERY APPLICATION

2019 ◽  
Author(s):  
Sakil Hossen ◽  
AKM M. Morshed ◽  
Amitav Tikadar ◽  
Azzam S. Salman ◽  
Titan C. Paul
Keyword(s):  
Experimental Investigation ◽  
Heat Exchanger ◽  
Heat Pipe ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Pipe Heat

Analysis of Heat Pipe Heat Exchanger (HPHE) For Waste Heat Recovery from an Air Conditioning System

2007 ◽  
Vol 2 (3) ◽  
pp. 86-95
Author(s):  
R. Sudhakaran ◽  
◽  
V. Sella Durai ◽  
T. Kannan ◽  
P.S. Sivasakthievel ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Heat Pipe ◽  
Air Conditioning ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Air Conditioning System ◽  
Pipe Heat
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