scholarly journals The vortex layer apparatus as a source of low-grade heat in the process of pretreatment of the substrate before anaerobic digestion

2021 ◽  
Vol 938 (1) ◽  
pp. 012004
Author(s):  
Andrey A Kovalev ◽  
Dmitriy A Kovalev ◽  
Victor S Grigoriev ◽  
Yuriy V Litti
Keyword(s):  
Experimental Data ◽  
Anaerobic Digestion ◽  
Cooling Water ◽  
Electricity Consumption ◽  
Heat Pumps ◽  
Experimental Plant ◽  
Low Grade ◽  
Cooling Water Temperature ◽  
Vortex Layer ◽  
Low Grade Heat

Abstract The limiting stage of anaerobic digestion (AD) of organic waste is the hydrolysis of particulate organic matter. One of the most promising and energy-efficient methods of waste pretreatment before AD is its processing in a vortex layer apparatus (VLA). The work was aimed at experimentally determining the energy characteristics of VLA. The description of the experimental plant and its energy balance were given. The ranges of electricity consumption and heat generation were shown. According to experimental data, the coefficient of conversion of electricity into heat was in the range of 0.367-0.515 at a cooling water temperature of 10.6-11.7 oC. Based on the experimental data obtained, it can be argued that VLA is a stable source of low-grade heat that can be utilized using heat pumps.

The Influence on the Physical and Mechanical Properties of the Tread by Preheating of Raw Rubber

2012 ◽  
Vol 501 ◽  
pp. 114-116
Author(s):  
Chuang Sheng Wang ◽  
Feng Bao Bai
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Water Temperature ◽  
Fill Factor ◽  
Cooling Water ◽  
Physical And Mechanical Properties ◽  
Rotor Speed ◽  
Cooling Water Temperature

This paper using synchronous rotor mixer, had researched the influence of preheating of raw rubber on the physical and mechanical properties of the tread under the same fill factor, rotor speed, cooling water temperature, and the pressure on top of bolt. According to processing and analysis of the experimental data, we can conclude that: As the temperature of raw rubber increased, the physical and mechanical properties of the tread had changed.

scholarly journals Temperature level optimization for low-grade thermal networks using the exergy method

2021 ◽  
Vol 2042 (1) ◽  
pp. 012029
Author(s):  
Yolaine Adihou ◽  
Malick Kane ◽  
Julien Ramousse ◽  
Bernard Souyri
Keyword(s):  
Geothermal Energy ◽  
Renewable Energy Sources ◽  
Electricity Consumption ◽  
District Heating ◽  
Heat Pumps ◽  
Energy Sources ◽  
Low Grade ◽  
Temperature Level ◽  
Optimal Network ◽  
Exergy Method

Abstract Low-temperature thermal networks open the field for additional renewable and recovered energy sources to be used. The exploitation of low exergy level resources requires decentralized heat pumps having a significant impact on the network's overall electricity consumption. Thus, a compromise must be found in order to minimize thermal and electrical consumption while integrating a maximum of renewable energy sources. This optimum is governed by the temperature level of the network. This paper aims at determining the optimal network temperature using the exergy criterion. The exergy method is detailed and applied to the multi-source network blueCAD (Fribourg) fed by geothermal energy, and FriCAD, a high temperature district heating network. The optimum temperature decreases as the share of geothermal energy in the production increases. For blueCAD, it ranges from 40 to 55 °C.

scholarly journals Efficiency of use of waste heat energy on the example of Chelyabinsk

2019 ◽  
Vol 140 ◽  
pp. 11003
Author(s):  
Grigoriy Tseyzer ◽  
Olga Ptashkina-Girina ◽  
Olga Guseva
Keyword(s):  
Thermal Energy ◽  
Waste Heat ◽  
Heat Pumps ◽  
Heat Output ◽  
Low Grade ◽  
Heat Sources ◽  
Sources Of Information ◽  
Equivalent Fuel ◽  
Low Grade Heat

We consider the possibility of improving the existing heat-suppling system in Chelyabinsk through the introduction of heat pump technology for the disposal of waste low-grade heat. Sources of information concerning the ways of utilization of waste thermal energy, the principles of work of heat pumps, classification of city sources of waste heat are analyzed. The technique directed to assess the effectiveness of applying heat pumps for each category of city sources of waste thermal energy is designed. The calculated assessment showed that the utilization of waste heat in the conditions of Chelyabinsk will reduce the annual energy of fuel consumption by 2.2 million tons of conventional fuel (24.9%). At the same time, thermal pollution will decrease by 1.5 million tons of equivalent fuel. This effect is possible with the use of heat pumps with a total heat output of 1,145 MW.

scholarly journals Recent Developments in Coating Technologies for Adsorption Heat Pumps: A Review

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 855
Author(s):  
Angela Caprì ◽  
Andrea Frazzica ◽  
Luigi Calabrese
Keyword(s):  
Composite Coatings ◽  
Renewable Energy Sources ◽  
Electricity Consumption ◽  
Heat Pumps ◽  
Adsorption Heat ◽  
Cooling Power ◽  
Low Grade ◽  
Transfer Resistance ◽  
Heating And Cooling ◽  
Adsorption Heat Pump

The use of adsorbent heat pumps as heating and cooling systems is particularly relevant thanks to their ability to exploit low-grade heat (e.g., below 90 °C) from renewable energy sources and waste energy streams with prospective applications in several fields, e.g., industrial and residential. Their development began in the 20th century and is still in full evolution. The great interest in their improvement and optimization was determined by some key factors inherent to their sustainability compared to traditional refrigeration systems (e.g., low electricity consumption and the low environmental impact of the employed refrigerants). Recently, strong efforts have been dedicated to increasing the achievable heating/cooling power density of this technology through the development of innovative adsorbent coating technologies. Indeed, the deposition of thin coatings on the surface of the heat exchanger could reduce the heat transfer resistance existing on the adsorbent material side, thus increasing the overall adsorption dynamics. Three main approaches have been assessed, namely a thick consolidated bed, binder-based composite coatings and in situ directly crystallization coatings. This paper provides a brief overview of some of the main achievements related to adsorbent coating technology developments for adsorption heat pump applications.

Application of customized absorption heat pumps for utilization of low-grade heat sources

2008 ◽  
Vol 28 (16) ◽  
pp. 2070-2076 ◽  
Author(s):  
Christian Keil ◽  
Stefan Plura ◽  
Michael Radspieler ◽  
Christian Schweigler
Keyword(s):  
Heat Pumps ◽  
Low Grade ◽  
Heat Sources ◽  
Low Grade Heat

scholarly journals Heat pump in a new modular configuration to recover low-grade heat emissions at enterprises

2020 ◽  
Vol 178 ◽  
pp. 01003
Author(s):  
Altai Sh. Alimgazin ◽  
Saule G. Alimgazina ◽  
Mikhail G. Zhumagulov
Keyword(s):  
Heat Pump ◽  
Heat Supply ◽  
Renewable Energy Sources ◽  
Heat Pumps ◽  
Low Grade ◽  
Industrial Enterprises ◽  
Power Resources ◽  
High Efficient ◽  
The Republic ◽  
Low Grade Heat

This paper reviews application of energy-saving heat pump technologies using non-traditional and renewable energy sources (NRES) to improve the efficiency of industrial equipment, heat supply systems in public sector and in agroindustrial industry in the Republic of Kazakhstan. The heat pump technology to transform low-grade heat of secondary low-temperature power resources into high-grade heat energy suitable for practical use is not a regular upgrade of traditional power resources but introduction a new, advanced, high-efficient and ecofriendly heat generation method. Introducing Modular Heat Pumps (MHP) at metallurgic and other industrial enterprises (power industry, petrochemsitry, machinery and etc.) as well as agroindustrial complex, housing and public utilities, and state-funded organizations of the Republic of Kazakhstan is expected to get a significant economic and ecological effects, foremost, by replacing traditional heat sources (solid and liquid fuel boilers, electric boilers), decrease greenhouse gases emissions into the atmosphere, and improving ecological situation. MHP application will allow to get 2-4 times saving budget funds annually allotted for heat supply (procurement various fuel types, repair current boiler equipment, ecological payments and etc.) in comparison with the existing traditional boilers.

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