Specific features of operation of metal hydride refrigerating plants and heat pumps utilizing low-grade heat

2007 ◽  
Vol 36 (5) ◽  
pp. 493-497
Author(s):  
V. A. Popovich ◽  
A. M. Mikhail-Zade
Keyword(s):  
Metal Hydride ◽  
Heat Pumps ◽  
Low Grade ◽  
Low Grade Heat

Numerical study of a metal hydride heat transformer for low-grade heat recovery

2011 ◽  
Vol 31 (14-15) ◽  
pp. 2749-2756 ◽  
Author(s):  
F.S. Yang ◽  
Z.X. Zhang ◽  
G.X. Wang ◽  
Z.W. Bao ◽  
J.C. Diniz da Costa ◽  
...  
Keyword(s):  
Metal Hydride ◽  
Heat Recovery ◽  
Numerical Study ◽  
Low Grade ◽  
Low Grade Heat ◽  
Heat Transformer

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.

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.

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.

Efficient Co-Harvesting of Solar Energy and Low-Grade Heat by Molecular Photoswitches for High Energy Density, Long-Term Stable Solar Thermal Battery

2019 ◽  
Author(s):  
Zhao-Yang Zhang ◽  
Tao LI
Keyword(s):  
Energy Density ◽  
Solar Energy ◽  
High Performance ◽  
High Energy ◽  
Solar Thermal ◽  
High Energy Density ◽  
Low Grade ◽  
Thermal Battery ◽  
Low Grade Heat

Solar energy and ambient heat are two inexhaustible energy sources for addressing the global challenge of energy and sustainability. Solar thermal battery based on molecular switches that can store solar energy and release it as heat has recently attracted great interest, but its development is severely limited by both low energy density and short storage stability. On the other hand, the efficient recovery and upgrading of low-grade heat, especially that of the ambient heat, has been a great challenge. Here we report that solar energy and ambient heat can be simultaneously harvested and stored, which is enabled by room-temperature photochemical crystal-to-liquid transitions of small-molecule photoswitches. The two forms of energy are released together to produce high-temperature heat during the reverse photochemical phase change. This strategy, combined with molecular design, provides high energy density of 320-370 J/g and long-term storage stability (half-life of about 3 months). On this basis, we fabricate high-performance, flexible film devices of solar thermal battery, which can be readily recharged at room temperature with good cycling ability, show fast rate of heat release, and produce high-temperature heat that is >20<sup> o</sup>C higher than the ambient temperature. Our work opens up a new avenue to harvest ambient heat, and demonstrate a feasible strategy to develop high-performance solar thermal battery.

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