heat recovery Articles
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Heat recovery
A heat recuperator absorbs an important part of the calorific energy from gases generated in the combustion of a solid, liquid or gaseous fuel in the process of: melting, heating, toasting, drying, etc. of an specific product. The calorific energy absorbed is transmitted to another fluid, mostly combustion air for the process and fuel saving is so important that the recuperator is amortized in ...
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Maximum possible efficiency for energy recovery from low-grade heat sources
Gas-to-gas heat exchangers are increasingly being used to recover low-grade heat (or cooling) to reduce energy requirements for space heating, drying and other applications. The efficiency of heat recovery is often limited by practical considerations which could – in principle – be reduced or eliminated by development of new materials and technology. However, this paper posits a fundamental ...
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Heat recovery solves carbon capture issues
Flue gas heat recovery at the fired heater overcomes major drawbacks to the successful operation of an amine based carbon capture plant The refining sector is facing a major transformation in the next three decades. Driven by more stringent regulation towards CO2 abatement and increasing pressure from consumers and investors, refiners are exploring options to significantly reduce CO2 emissions. ...
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Thermo–economic analysis of heat pipe heat exchanger for waste heat recovery in thermal systems
Thermo–economic analysis of Heat Pipe Heat Exchanger (HPHE) for waste heat recovery in thermal systems using the P1–P2 and NTU methods is presented. The optimum effectiveness of a HPHE is given as a polynomial equation, whereas the net savings and payback period are given in closed form to enable the HPHE designer to determine the optimised values directly. In addition to this, exergy analysis of ...
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Thermodynamic analysis of chimney
Thermodynamic analysis, including energy and exergy, was applied for studying a chimney phenomenon. The mathematical model of a chimney was derived and used for evaluation of output trends responsive to change of some input parameters. It was proposed to use chimney efficiency as a measure of waste heat recovery. Also, the new component of exergy of the substance, called mechanical exergy, was ...
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Experimental study of a novel thermoelectric domestic-ventilator with heat recovery
A novel prototype thermoelectric domestic-ventilator with air-conditioning heat recovery of exhaust had been made and tested in this paper. A thermoelectric heat exchanger is integrated with a flat-fin cross-flow heat exchanger in this ventilator. This ventilator is investigated and its cooling (or heating) performance evaluated in terms of the Coefficient of Performance (COP), cooling and ...
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The Nitrogen Experts - success factors
Employees Highly experienced: our employees average 14 years of nitrogen pumping services Equipment Incorporates the latest technology available Meets high standards of quality, maintained in-house Offers both heat recovery and burner units Management Committed to providing the best training possible Dedicated to the highest safety standards Responsive to industry changes ...
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Energy conservation in aluminium foundries by waste heat recovery from solidifying molten metal
This paper presents a unique attempt to preheat the raw materials by recovering the waste heat from solidifying molten metal in shape castings of aluminium using sand moulds. Finite element analysis of the problem using ANSYS has also been done, results of which show satisfactory agreement with the experimental results. By using this preheating method, it is proved that around 16% of heat ...
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Exergy performance analyses of an irreversible two–stage intercooled regenerative reheated closed Brayton CHP plant
A combined heat and power (CHP) plant model composed of an irreversible constant– temperature heat reservoirs two–stage intercooled regenerative reheated closed Brayton cycle and a heat recovery device is proposed using finite time thermodynamics. By taking dimensionless exergy output rate and exergy efficiency as the objectives, the performance of the plant is investigated. The two cases with ...
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The Entropy Generation Minimisation based on the Revised Entropy Generation Number
In the present work, an improved Entropy Generation Minimisation (EGM) approach aiming at minimising the revised entropy generation number which is the non-dimensionalised entropy by the ratio of heat flow to the input temperature of the cold fluid is developed for a plate-fin heat exchanger design with multiple design variables with the help of genetic algorithm. It is found that the approach ...
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Energy sustainable development through energy efficient heating devices and buildings
Energy devices and buildings are sustainable if, when they operate, they use sustainable (renewable and refuse) energy and generate nega-energy. This paper covers three research examples of this type of sustainability: (1) use of air-to-earth heat exchangers, (2) computer control of heating and cooling of the building (via heat pumps and heat-recovery devices), and (3) design control of energy ...
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A study on the thermodynamic analysis of a cascaded latent heat storage system over the single storage tank system for diesel engine waste heat recovery
This article presents the comparison of performance of a cascaded Latent Heat Storage (LHS) system over the Single Storage Tank (SST) system for heat recovery from a diesel engine. The energy and exergy saved and efficiencies during the charging process are evaluated and reported using actual system data. The discharge process is analysed with a case study and it is concluded that it is possible ...
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Heat recovery from corrosive flue gas
For improvements to energy efficiency in the petrochemical industry, waste heat recovery from corrosive flue gas is the most cost effective source to exploit During the conversion of primary energy, approximately 5-10% of the energy used is lost via hot flue gas. There is no need to emphasise that significant savings are within reach when 60-70% of refining operational costs consist of energy ...
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Rutherford Appleton Laboratories - Case study
The new Research Complex at Harwell Oxford is a multidisciplinary laboratory providing world leading facilities for new and cutting edge research in both life and physical sciences and the interface between them. Environmental issues were at the forefront of the building design with all energy use carefully monitored. An innovative Earth Tube has been buried along side the building to utilise ...
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Specification of Cordierite Blocks
Cordierite block (so called Monolith Media) is applied as heat storage media in regenerative thermal processes to recover thermal energy also it can resolves RTO siloxane clogs in someway. Structured media, take Cordierite blocks as example, it packs a high density of ceramic into a small area while offering a lower pressure drop. It can be a highly cost-effective type of media for RTOs makes it ...
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What is HRV mechanical system
MVHR (Mechanical Ventilation with Heat Recovery) provides fresh filtered air into a building even as retaining most of the power that has already been used in heating the building. Heat Recovery Ventilation is the solution to the ventilation wants of energy efficient buildings. Mechanical air flow with warmth restoration (MVHR), warmth restoration ventilation (HRV) or Comfort air flow are all ...
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First industrial application of an open absorption cycle for heat transformation in a district-heating network
The first plant for high temperature utilisation of higher heating value was realised under industrial conditions in a combined heat and power plant. The technology results in an increased heat recovery temperature and a stronger dehumidification of the flue gas. Beyond that, the use of large solution flow within an adiabatic absorber enables to combine gas scrubbing and dehumidifying. Economic ...
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Co-production of synthesis gas and power by integration of Partial Oxidation reactor, gas turbine and air separation unit
A new synthesis gas production process based on partial oxidation (POX) of natural gas is investigated. Synthesis gas and mechanical power are generated in a plant that integrates a POX reactor, a synthesis gas turbine and an air separation unit. The synthesis gas is expanded in the turbine which runs the air separation unit. By means of an exergy analysis, it is shown that the synthesis gas ...
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7.5 MWe Direct Drying and Cogeneration - Tissue Industry - Case Study
OWNER Lucart Group LOCATION Province of Lucca, Italy DIRECT DRYING DESIGN AND SUPPLY Valmet PRODUCT Taurus 70 Gas Turbine CUSTOMER VALUE Efficient and Sustainable Power The Lucart Castelnuovo di Garfagnana tissue mill is part of the Lucart Group, one of the first European paper and tissue producers. The mill has inaugurated its cogeneration system which is comprised of a Taurus™ 70 gas ...
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Rzeszow, Poland Project - Case Study
A new waste incineration plant in Rzeszów delivered by Termomecanicca / Astaldi consortium as a general contractor. It will be complemented by Radscan's installation. This is the first such a plant in Poland where waste incineration is combined with heat recovery by flue gas condensation. The delivery includes quench, and condenser. Montage start September 2017, take over May ...
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