Continuous, High Efficiency Defrosting of Air-to-Air Heat Pumps

Piancastelli, Luca

doi:10.56578/peet010102

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…Manufacturing costs, integral to the practical application of designs, were not evaluated for fins incorporating either LVGs or louvered fins. The use of longitudinal vortex generators can be explored in other fields as in photovoltaics systems cooling with air [16], in wind energy harvesting by aeroelastic excitation [17], for thermal energy storage systems [18], and for air pumps to enhance the flow in the mixing devices [19].…”

Section: Resultsmentioning

confidence: 99%

Comparative Analysis of Longitudinal Vortex Generators and Louvered Fins in Enhancing Thermal Performance in Compact Heat Exchangers

Valencia,

Muñoz

2023

IJHT

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Compact heat exchangers equipped with flat tubes have traditionally been employed in automotive cooling systems. To augment thermal performance, louvered fins have been integrated on the air side. over recent decades, the efficacy of longitudinal vortex generators (LVG) in heat exchangers has been rigorously investigated, leading to the proposal of innovative designs characterized by their aerodynamic properties. In this study, a novel LVG design sourced from extant literature was juxtaposed against the conventional louvered fins. The shear-stress transport (SST) k-ω model was utilized to depict the turbulence. When the turbulent flow and heat transfer properties were assessed, distinct variations were observed between multiple rows of LVG and the louvered fins. Enhanced thermal performance, with a value reaching 1.3, was noted for configurations incorporating five rows of LVG arrangements at a Reynolds number of 8000. In contrast, the thermal performance of louvered fins was observed to wane with increasing Reynolds numbers, recording a performance measure of merely 1.08 at the aforementioned Reynolds number.

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Section: Resultsmentioning

confidence: 99%

Comparative Analysis of Longitudinal Vortex Generators and Louvered Fins in Enhancing Thermal Performance in Compact Heat Exchangers

Valencia,

Muñoz

2023

IJHT

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“…In addition, the thermal power units that integrate the energy storage can significantly increase the reserve control capacity of ±2.8%. Piancastelli [4] proposed a patented method to recover heat is obtained from the burned flue gas by exchanging heat with the inlet air of an external heat exchanger. The ventilation system of the unit sends fresh air through the extraction fan.…”

Section: Introductionmentioning

confidence: 99%

Research on Coordinated Control Strategy of Power Response Rate of Thermal Power Plant with High Temperature Molten Salt Heat Storage

Li¹,

Li²,

Ma³

2023

IJHT

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Large-scale intermittent renewable energy grid-connected power generation requires thermal power units with sufficient flexibility to adjust resources, which can achieve deep peak regulation of 35% THA, and respond to load changes when intermittent renewable energy is connected to the grid in real time. In this paper, the flue gas heating molten salt is extracted directly from the process flow of the thermal power unit for heat storage, and the energy utilization efficiency is theoretically about three times that of the electric heat storage peak regulating system. The simulation results show that the coordinated control of flue gas-molten salt heat exchanger, molten salt-water/steam heat exchanger and boiler main control can reduce the depth peak regulation of thermal power units by 10%. The coordinated control method of thermal power unit of coupled molten salt heat storage system can effectively improve the response speed of AGC and primary frequency modulation of thermal power unit, and the output power response speed is increased by 39.12% after stabilization.

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“…New technologies are being developed to address the high heat flux density generated during the operation of power electronic devices. Several cooling methods, including forced air cooling [1], oil cooling, water cooling [2], and evaporative cooling, are employed to tackle this issue [3]. By using latent heat, the evaporative cooling technology [4] has the advantages of high heat exchange efficiency, good temperature stability and high insulation.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization and Performance Evaluation of a Low-Pressure Drop Air-Cooled Condenser for Self-Circulating Evaporative Cooling Systems

Li¹,

Ruan²

2023

IJHT

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The self-circulating evaporative cooling technology, by using latent heat, solves the bottleneck problem of high heat flux dissipation of the power electronic devices. In selfcirculating system, the pressure drop of heat transfer fluid through each component needs to be minimized for the weak circulating power. Thus, the air-cooled condenser design must consider the pressure drop along the fluid flow. This paper presents the design flow and thermodynamic model of the air-cooled condenser, and the self-circulating test platform which features heat exchange capacity and pressure drop measurement. In view of the heat exchange capacity of 17 kW and the pressure drop limit below 500Pa, a new air-cooled condenser is constructed with design flow optimized parameters and verified through experiments. The results indicate that the pressure drop error between experimental and designed values was less than 16.6% for a heat dissipation rate over 17kW. After further discussion, it is concluded that a fluid-sided hydraulic diameter of 2.5-3mm provides an effective balance between heat exchange capacity and pressure drop. With the increase of air speed, the total heat transfer coefficient of the condenser increases dramatically while the fin spacing makes a greater increase in air pressure drop than in heat transfer coefficient.

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Continuous, High Efficiency Defrosting of Air-to-Air Heat Pumps

Cited by 4 publications

References 10 publications

Comparative Analysis of Longitudinal Vortex Generators and Louvered Fins in Enhancing Thermal Performance in Compact Heat Exchangers

Comparative Analysis of Longitudinal Vortex Generators and Louvered Fins in Enhancing Thermal Performance in Compact Heat Exchangers

Research on Coordinated Control Strategy of Power Response Rate of Thermal Power Plant with High Temperature Molten Salt Heat Storage

Design Optimization and Performance Evaluation of a Low-Pressure Drop Air-Cooled Condenser for Self-Circulating Evaporative Cooling Systems

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