Efficiency of vapour-pump-equipped condensing boilers

Kuck, J. A.

doi:10.1016/1359-4311(95)00067-4

Cited by 36 publications

(16 citation statements)

References 2 publications

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“…The residual heat lost with flue gases, that cannot be efficiently used by a heating network, can be recovered by heating the air stream directed to the burner or combustion chamber [4,10,11]. A solution called an air preheater involves the use of a diaphragm heat exchanger, where the residual heat of combustion gases is recovered by heating the combustion air [4,12].…”

Section: Heat Recovery Systemsmentioning

confidence: 99%

Optimizing the Recovery of Latent Heat of Condensation from the Flue Gas Stream through the Combustion of Solid Biomass with a High Moisture Content

Kabiesz,

Kubica

2024

Energies

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This study focuses on a specific method of heat recovery in combustion systems especially dedicated to wet biomass. Solid biofuels such as woodchips or bark are sources of renewable energy, a substitute of fossil fuels, of dynamically growing importance due to the energy transformation towards a zero-emission economy. Various solutions are generally known, in particular those based on absorption and compressor heat pumps. The solution presented here eliminates the need for such expensive equipment while maintaining very high efficiency. It involves a system of several suitably configured scrubbers. Chemcad 8 simulation shows how the fluid flow rates affect the efficiency of the proposed solution. Optimal configuration of the system and adjustment of the process parameters (flow rates of water in scrubbers circuits) result in a thermal efficiency as high as 108.2%, close to the maximum theoretically achievable efficiency (111%). The system was compared with other existing solutions for efficiency. The performance of the system was examined under different operating conditions to determine the optimum. The effect of an increased fuel moisture content on efficiency was determined. It was shown that the key to achieving significant cost benefits for such a solution is to optimise the flow rates of the circulating fluids.

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Section: Heat Recovery Systemsmentioning

confidence: 99%

Optimizing the Recovery of Latent Heat of Condensation from the Flue Gas Stream through the Combustion of Solid Biomass with a High Moisture Content

Kabiesz,

Kubica

2024

Energies

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“…Figure c is the schematic of the system consisting of a gas–water indirect heat exchanger, a gas–water spray tower, and an air–water spray tower. , Compared with the system that uses economizers or air preheaters, the surplus heat recovery performance is comparable. In addition, direct contact heat exchangers can effectively avoid low-temperature corrosion.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of an Absorption Heat Pump System for Waste Heat and Moisture Cascade Recovery from Flue Gas

Xue

et al. 2022

ACS Omega

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“…Common technical methods are condensation [ 8 , 9 , 10 ], absorption [ 11 , 12 , 13 ] or membrane separation [ 14 , 15 ]. Condensation method using a recuperative heat exchanger or a spray tower [ 16 , 17 ], the flue gas temperature is reduced to a temperature below the dew point of water vapor. The water vapor in the flue gas is condensed and precipitated to achieve the water and waste heat recovery from the flue gas.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on a Ceramic Membrane Condenser with Air Medium for Water and Waste Heat Recovery from Flue Gas

Teng

Shen

et al. 2021

Membranes

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Ceramic membrane condensers that are used for water and waste heat recovery from flue gas have the dual effects of saving water resources and improving energy efficiency. However, most ceramic membrane condensers use water as the cooling medium, which can obtain a higher water recovery flux, but the waste heat temperature is lower, which is difficult to use. This paper proposes to use the secondary boiler air as the cooling medium, build a ceramic membrane condenser with negative pressure air to recover water and waste heat from the flue gas, and analyze the transfer characteristics of flue gas water and waste heat in the membrane condenser. Based on the experimental results, it is technically feasible for the ceramic membrane condenser to use negative pressure air as the cooling medium. The flue gas temperature has the most obvious influence on the water and heat transfer characteristics. The waste heat recovery is dominated by latent heat of water vapor, accounting for 80% or above. The negative pressure air outlet temperature of the ceramic membrane condenser can reach 50.5 °C, and it is in a supersaturated state. The research content of this article provides a new idea for the water and waste heat recovery from flue gas.

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Efficiency of vapour-pump-equipped condensing boilers

Cited by 36 publications

References 2 publications

Optimizing the Recovery of Latent Heat of Condensation from the Flue Gas Stream through the Combustion of Solid Biomass with a High Moisture Content

Optimizing the Recovery of Latent Heat of Condensation from the Flue Gas Stream through the Combustion of Solid Biomass with a High Moisture Content

Performance Analysis of an Absorption Heat Pump System for Waste Heat and Moisture Cascade Recovery from Flue Gas

Experimental Study on a Ceramic Membrane Condenser with Air Medium for Water and Waste Heat Recovery from Flue Gas

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