Experimental study regarding the effects of forced ventilation on the thermal performance for super-large natural draft wet cooling towers

Zhou, Yang; Gao, Ming; Long, Guoqing; Zhang, Zhengqing; Dang, Zhigang; He, Suoying; Sun, Fengzhong

doi:10.1016/j.applthermaleng.2019.03.149

Cited by 23 publications

(3 citation statements)

References 32 publications

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“…This correlated with Table 2 appears halfway of the runs. As compared to the study by Zhou et al [50] the use of forced ventilation, rather than the natural ventilation used in the plant considered in this study, improves the Merkel number and hence the cooling efficiency of the system.…”

Section: Effect Of Increasing Water Temperature On Air Moisture Contentmentioning

confidence: 57%

Parametric Effects on the Performance of an Industrial Cooling Tower

Bamimore

Enibe

Adedeji

2021

Journal of Thermal Engineering

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Sensible and latent heat rejection from heat engines is of high necessity for system efficiency and continuous production. The cooling tower is one of the major heat-exchanging systems used for cooling industrial heat systems by intimately mixing hot water with cooling air. Optimal operating conditions and parameters of the system are highly essential for its effectiveness and efficiency. This study used the Poppe model to evaluate selected thermodynamic relations of a rectangular counter-flow industrial cooling tower of a steel rolling mill using the system's inlet and outlet data as initial conditions. The effect of increasing the water temperature on the air moisture content, Merkel number, and specific enthalpy was studied across the fills of the cooling tower. Air moisture content, Merkel number and specific enthalpy of the system increase with increasing water temperature. However, while other variables reach a stationary point at half the nodal segments, the specific enthalpy increases across the fills in the system. It was concluded that the use of nano particles with high heat removal rate could increase the efficiency of the system. Also, an increase in the quantity of the makeup water of a force draft system is recommended towards increasing the system efficiency.

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Section: Effect Of Increasing Water Temperature On Air Moisture Contentmentioning

confidence: 57%

Parametric Effects on the Performance of an Industrial Cooling Tower

Bamimore

Enibe

Adedeji

2021

Journal of Thermal Engineering

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“…The commonly used method for cooling water system is the constant temperature difference control method 29,32,33 . This method is based on keeping the cooling approach (the difference between outlet water temperature of cooling tower and outdoor wet‐bulb temperature) by adjusting the fan speed and on keeping the cooling water temperature difference by adjusting the pump speed.…”

Section: Methodsmentioning

confidence: 99%

Study on simplified energy‐efficient control methods of HVAC cooling water system from the global online optimization perspective

Zhao

Wang

et al. 2021

Energy Science & Engineering

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The cooling water system is an indispensable part in the removal of the indoor cooling load in heating, ventilation, and air‐conditioning (HVAC) systems. However, the complexity and strong coupling characteristics of the controlled objects lead to unsatisfied control effects in most practical engineering applications. In this paper, the cooling water system is studied as a whole from the perspective of online application. Firstly, the mathematical models of the cooling water system are introduced and simplified based on the experimental data from the actual system. The simplified models have easy obtained inputs and programmable structure, which renders higher feasibility and practicality for the model‐based control method applied in the real system. On this base, an easily implemented control method for cooling water system is proposed to improve the global efficiency. By comparing with the conventional constant temperature difference control strategy and constant speed control strategy in the simulation platform, the proposed water flow optimization control strategy is superior in both global COP and energy saving at the same operating conditions, and 0.37% and 3.45% of energy consumption can be saved, respectively. The simulation results imply that the proposed simplified method is a referable control method for designing or retrofitting the real cooling water system.

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“…Their finding was that the dry-wet hybrid rain zone can increase ventilation rate and eliminate the high temperature zone of center of the tower. To sufficiently use the water-dropping potential of the rain zone, Dang et al [21] and Zhou et al [22] installed an axial fan on the top of the fill. The fan was driven by the water-dropping potential of the rain zone, and the influence of the fan diameter on pumping force of cooling tower was analyzed.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Cooling Characteristics of Different Fill Layout Patterns on a Single Air Inlet Induced Draft Cooling Tower

Deng

Sun

2021

Energies

Self Cite

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To enhance the cooling capacity of a single air inlet induced draft cooling tower (SIDCT), the stepped fill layout pattern is proposed in this paper. A three-dimensional numerical model is established and validated by field measurement data. The cooling capacity of towers equipped with uniform fill and stepped fill is compared under various crosswind velocities (0 m/s–12 m/s) and crosswind angles (0°–180°). The results showed that the ventilation rate of the total tower with stepped fill is increased. Under the studied crosswind velocity and angle, the cooling capacity of the stepped fill tower is superior to the uniform fill tower. After using stepped fill, the mean drop of outlet water temperature rises by 0.29 °C, 0.27 °C, 0.17 °C, 0.10 °C, and 0.19 °C, corresponding to crosswind angles from 0° to 180°. The increment of cooling capacity is the maximum under the crosswind angles of 0° and 45° and is the minimum under the crosswind angles of 90° and 135°. The maximum increased value of N is 0.65 under the crosswind velocity of 4 m/s, 0.85 under 8 m/s, and 0.95 under 12 m/s.

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Experimental study regarding the effects of forced ventilation on the thermal performance for super-large natural draft wet cooling towers

Cited by 23 publications

References 32 publications

Parametric Effects on the Performance of an Industrial Cooling Tower

Parametric Effects on the Performance of an Industrial Cooling Tower

Study on simplified energy‐efficient control methods of HVAC cooling water system from the global online optimization perspective

Comparative Study on the Cooling Characteristics of Different Fill Layout Patterns on a Single Air Inlet Induced Draft Cooling Tower

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