Numerical and Experimental Research on Performance of Single-row Finned Tubes in Air Cooled Power Plants

Abstract

In this paper, a new configuration of drop-shaped tube is proposed to improve the finned-tube thermo-flow performance. As the basic heat exchanger element of a Direct Air Cooled Condenser (DACC), the performance of finned tubes is very important to the optimal design of DACCs. Under turbine rated load (TRL) conditions and various frontal air velocities, the airside flow and heat transfer performance of single row flattened finned tubes and drop-shaped finned tubes are numerically investigated. The flow field, temperature field and thermo-flow characteristics are analyzed. Experimental verification and field coordination (synergy) analysis are carried out, with the simulation results agreeing well with experimental results. The performance of pressure drop, heat transfer coefficient and power consumption of these 4 Schemes are comprehensively compared and evaluated. When compared to the flattened finned tube the pressure drop of the drop-shaped Scheme 4 tube reduced by 5.9 % while the heat transfer coefficient reduced by 2.8 % at a frontal velocity of 1.8 m/s. Scheme 4 produces the best thermo-flow performance, especially at low air velocity, benefiting from a lower pressure drop and a moderate heat transfer coefficient.

Nonlinear numerical analysis of convective-radiative fin using MLPG method

“…Over the period of time different numerical methods have been employed by the researchers to analyse the behavior of fins. Singh et al [1] have used meshless element free Galerkin method; Cole et al [2] have employed Green's functions (GF) in the form of infinite series; Basri et al [3] have shown confidence on efficient finite element method and differential quadrature method; Wang et al [4] have presented method of superposition and separation variables; Singh et al [5] and Sao and Banjare [6] have used quasi-steady theory; finite volume method has been employed by Lotfi and Belkacem [7] and Al-Rashed et al [8]; Taler and Taler [9] have presented the coupling of finite volume method-finite element method; B-spline based finite element method has been highlighted by Reddy et al [10] and field synergy principle optimization analysis has been conducted by Wei et al [11] to analyse the heat transfer problems of fins.…”

Numerical investigation on the effect of a modified corrugated double tube heat exchanger on heat transfer enhancement and exergy losses

“…It was observed that Nu number and pressure drop were increased up to 3.33 and 1.11 times the plain heat exchanger. W. Zhang et al [6] numerically and experimentally investigated on performance of single-row finned tubes in air cooled power plant. They studied 4 schemes and compared them and found that pressure drop in flattened finned tube reduced 5.9% while heat transfer coefficient was reduced by 2.8%.…”

Physical Approach for Sand Flux Quantification and Flow Dynamic Properties Investigation for Fine Sand Grains Transport

“…In order to explore the fundamental internal mechanism in aeolian sand transport, numerical and analytical studies have been carried out generally subdivided into several different sub-processes [8]- [10]. They attempt to understand and quantifying the horizontal mass flux of saltating particles following wind intensity, with soil particles size and ground characteristics [11].…”