Abstract
This study reports on a modeling strategy for large Air-Cooled Condensers (ACCs). A large 64-fan ACC was modeled under various crosswind conditions that investigated the ACC’s specific axial flow fan configuration. The ACC model was developed in two parts, an axial flow fan model and a heat exchanger model. The axial flow fans were modeled using an Actuator Disk Model (ADM). The heat exchangers’ pressure drop was modeled using the Darcy-Forchheimer porosity model, and the Effectiveness Number of Transfer Units (ε-NTU) method was used to determine the air heat transfer rate. The ACC was configured using two different axial flow fans, identified in this study as the L-fan and the N-fan. Comparatively the L-fan has a steeper fan static pressure characteristic curve than that of the N-fan, at the cost of a greater shaft power consumption. Under normal operating conditions the average heat-to-power ratios were calculated at 89.91 W/W for the L-fan and 102.48 W/W for the N-fan. Under crosswind conditions of 9 m/s the heat-to-power ratios of the leading edge fan-units decreased by 80.6% and 87.0% for the L-fan and N-fan respectively. However, at the fan-units immediately downstream of the leading edge the heat-to-power ratios only decreased by 34.1% for the L-fan and 64.2% for the N-fan.
Highlights
Thermal power generation requires the discharge of heat to complete the steam cycle [1]
The volumetric effectiveness and heat transfer effectiveness of the air-cooled condensers (ACCs) are shown in Figure 4 a) V
The volumetric effectiveness of the ACC was found to correlate with the heat transfer effectiveness
Summary
Thermal power generation requires the discharge of heat to complete the steam cycle [1]. This study investigates a 64 fan-unit forced draft configuration ACC and its performance subject to various crosswind conditions. Various forced draft configuration ACCs under adverse crosswinds conditions have previously been investigated [2,3,4,5]. These ACCs faced limitations in terms of the nature of the axial flow fan models used [3, 4] and/or the size of the ACC investigated (max 30 fan-units) [2, 3, 5]. This study investigates a traditional forced draft ACC with 64 A-frame fan-units in a 8 × 8 configuration. A specific fan configuration utilising a high power fan at the front and back of the ACC is tested as a means to improve performance under adverse crosswind
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