Temperature Impact of the Industrial Cooling Water Discharges in a Long Boat Slip of Hamilton Harbour

2009 ◽  
Vol 44 (3) ◽  
pp. 221-231
Author(s):  
Cheng He
Keyword(s):  
Water Temperature ◽  
Thermal Structure ◽  
Water Discharge ◽  
Three Dimensional ◽  
Cooling Water ◽  
Summer Period ◽  
Transport Models ◽  
Hamilton Harbour ◽  
Harbour Water ◽  
Intake Water

Abstract The thermal structure of industrial cooling water discharged into a long, narrow and shallow, straight open boat slip (Ottawa Street Slip, [OSS]) was investigated by field measurements during the hottest summer month in 2006. Three-dimensional hydrodynamic and thermal transport models were established and verified with measurements. The main purposes of this study were to understand the mechanism of the thermal structure in the OSS during the hot summer season under the present cooling water discharge conditions, to investigate the influence of harbour water on the thermal structure in the slip, and to establish a means for scientific predictions of the impact of cooling water discharges in a future study. Toward this end, the water temperature at multiple locations along the OSS and meteorological data near the study site were collected during the summer period of 2006. The collected data reveal: (1) during the measured summer period, the water temperature in the slip can be higher than 30°C during a period of high air temperatures; (2) water temperature variations within short periods of 15, 30, 60, and 120 minutes were no more than 4°C during the entire measurement period; (3) water temperature in the slip is controlled by both air and cooling discharge temperatures, and the cooling water temperature's increase due to industrial cooling processing seems to be relatively independent of the intake water temperature; therefore, the water temperature in the slip varied mainly with the air temperature; (4) since water temperature in the slip seemed to closely follow the intake water temperature, the intake channel may need to be optimized to maximize the possibility of getting the coolest water available from Hamilton Harbour; and (5) the cooler harbour water could not penetrate deeply into the slip. The collected water temperature data were also used for verification of three-dimensional hydrodynamic and transport models. The simulation results showed that the established model could reasonably well reproduce general thermal structures in the entire slip. This achieved the ultimate goal of the study for establishing a model to assess the impacts of further increase of cooling water discharge into the OSS.

Numerical modeling study of impact of a large sediment capping facility on local industrial cooling water temperature

2010 ◽  
Vol 37 (10) ◽  
pp. 1289-1302 ◽  
Author(s):  
Cheng He
Keyword(s):  
Water Temperature ◽  
Thermal Structure ◽  
Three Dimensional ◽  
Cooling Water ◽  
Acoustic Doppler Current Profiler ◽  
Vertical Temperature Profile ◽  
Buoyant Force ◽  
Cooling Water Temperature ◽  
Current Profiler ◽  
Long Channel

This study assesses the potential increase in the intake cooling water temperatures if both the local industrial intake water and outfall cooling waters are trapped in the same narrow long channel. A three-dimensional (3D) hydrodynamic model was used to quantitatively investigate water temperature structures in the channel. The model was verified in a previous hydrodynamic study at the same location using vertical current profiles measured by an acoustic Doppler current profiler (ADCP) and further verified in this study with the measured vertical temperature profile. Several scenarios were investigated under various wind and geometrical conditions. The simulated results revealed that because of the strong buoyant force induced by water temperature differences the trapped hot outfall water would not be directly retaken by the intake located about 70 m away from the outlet and 6 m below the surface. The thermal structure in the channel eventually reached an equilibrium stage due to additional fresh bay water and heat loss through various heat-transfer mechanisms from the air–water interface. The results of this modelling study can be extended to solve other similar environmental and civil engineering problems.

scholarly journals Numerical Study of the Effect of a Power Plant Cooling Water Discharge in the Montevideo Bay

2011 ◽  
Vol 2011 ◽  
pp. 1-23 ◽  
Author(s):  
Mónica Fossati ◽  
Pablo Santoro ◽  
Santiago Urrestarazu ◽  
Ismael Piedra-Cueva
Keyword(s):  
Power Plant ◽  
Water Temperature ◽  
Water Intake ◽  
Numerical Study ◽  
Water Discharge ◽  
Cooling Water ◽  
Thermal Plume ◽  
Thermal Exchange ◽  
Correct Representation ◽  
Power Plant Cooling

The numerical simulation of the water temperature in the Río de la Plata River and Montevideo's Bay was done using the numerical model of finite elements RMA-10 in its 2D vertical integrated mode. Parameters involved in the formulations of thermal exchange with the atmosphere were adjusted using measurements of water temperature in several locations of the water body. After calibrating the model, it was used to represent the operation of a power plant located in Montevideo's Bay. This central takes water from the bay in order to cool its generators and also discharges high-temperature water into the bay. The correct representation of temperatures at the water intake and discharge of the plant reflects that the model is able to represent the operation of the central. Several analysis were made to study the thermal plume, the effects of the water discharge on the water intake of the power plant, and the effect on environmental variables of the study area like currents.

scholarly journals Pliocene three-dimensional global ocean temperature reconstruction

2009 ◽  
Vol 5 (4) ◽  
pp. 769-783 ◽  
Author(s):  
H. J. Dowsett ◽  
M. M. Robinson ◽  
K. M. Foley
Keyword(s):  
Water Temperature ◽  
Deep Water ◽  
Bottom Water ◽  
Thermal Structure ◽  
Three Dimensional ◽  
The Arctic ◽  
Global Ocean ◽  
Validation Data ◽  
Data Set ◽  
Bottom Water Temperature

Abstract. The thermal structure of the mid-Piacenzian ocean is obtained by combining the Pliocene Research, Interpretation and Synoptic Mapping Project (PRISM3) multiproxy sea-surface temperature (SST) reconstruction with bottom water temperature estimates from 27 locations produced using Mg/Ca paleothermometry based upon the ostracod genus Krithe. Deep water temperature estimates are skewed toward the Atlantic Basin (63% of the locations) and represent depths from 1000 m to 4500 m. This reconstruction, meant to serve as a validation data set as well as an initialization for coupled numerical climate models, assumes a Pliocene water mass framework similar to that which exists today, with several important modifications. The area of formation of present day North Atlantic Deep Water (NADW) was expanded and extended further north toward the Arctic Ocean during the mid-Piacenzian relative to today. This, combined with a deeper Greenland-Scotland Ridge, allowed a greater volume of warmer NADW to enter the Atlantic Ocean. In the Southern Ocean, the Polar Front Zone was expanded relative to present day, but shifted closer to the Antarctic continent. This, combined with at least seasonal reduction in sea ice extent, resulted in decreased Antarctic Bottom Water (AABW) production (relative to present day) as well as possible changes in the depth of intermediate waters. The reconstructed mid-Piacenzian three-dimensional ocean was warmer overall than today, and the hypothesized aerial extent of water masses appears to fit the limited stable isotopic data available for this time period.

Comparison of bottom and surface cooling water withdrawals on the thermal regime of Hamilton Harbour

1992 ◽  
Vol 19 (2) ◽  
pp. 355-358 ◽  
Author(s):  
Daesoo Lee ◽  
P. F. Hamblin ◽  
A. A. Smith ◽  
W. J. Snodgrass
Keyword(s):  
Thermal Regime ◽  
Thermal Stratification ◽  
Current Practice ◽  
Cooling Water ◽  
Surface Cooling ◽  
Weak Response ◽  
One Dimensional ◽  
Hamilton Harbour ◽  
Harbour Water ◽  
Water Withdrawals

An analysis of the sensitivity of the annual thermal regime of Hamilton Harbour to the depth of intake of industrial cooling water was conducted using a one-dimensional thermodynamic model. The intake of approximately 20 m3/s of cooling water from the bottom of the harbour, as opposed to the current practice of surface withdrawal, was calculated; the result indicates marginally reduced thermal stratification and hypolimnetic volumes in summer. It was shown by a further sensitivity analysis that the reason for this relatively weak response to the withdrawal level was due to the overwhelming input of colder Lake Ontario water to the Harbour. Key words: harbour water quality, thermodynamic modelling.

Characteristic of Thermal Structure in Reservoir in Different Climate Zones

2013 ◽  
Vol 807-809 ◽  
pp. 1634-1643 ◽  
Author(s):  
Ding Guo Jiang ◽  
Yu Jing Bie ◽  
Wei Liu
Keyword(s):  
Water Temperature ◽  
Thermal Stratification ◽  
Thermal Structure ◽  
Water Environment ◽  
Three Dimensional ◽  
Temperature Structure ◽  
Climatic Region ◽  
Reservoir Water ◽  
Discharge Water ◽  
The Impact

A three dimensional mathematical model was used to simulates water temperature structure of a model reservoir under the southwest plateau climate and the subtropics monsoon climate separately. The calculated result shows that: 1. in the Southwest plateau climatic region, obvious double convection was noticed of the surface water, while single convection appears in subtropics monsoon climatic region. 2. Thermal stratification in tropics monsoon climatic region is steadier than the southwest plateau climatic region. 2. In the subtropics monsoon climatic region the water temperature difference between discharge and natural water is more remarkable than the Southwest plateau climatic region, namely that in the subtropics monsoon climatic region the impact of discharge water on downstream water temperature is more appreciable. The research conclusion may provide reference and the basis for the contrastive analysis of related achievement in reservoir water temperature and the water environment.

scholarly journals Reduction of CO2 Emissions in Steelmaking by Means of Utilization of Steel Plant Waste Heat to Stabilize Seasonal Cooling Water Temperature

2021 ◽  
Vol 13 (11) ◽  
pp. 5957
Author(s):  
Tomas Mauder ◽  
Michal Brezina
Keyword(s):  
Continuous Casting ◽  
Water Temperature ◽  
Co2 Emissions ◽  
Waste Heat ◽  
Cooling Water ◽  
Main Idea ◽  
Casting Process ◽  
Spray Cooling ◽  
Steel Plant ◽  
Cooling Water Temperature

Production of overall CO2 emissions has exhibited a significant reduction in almost every industry in the last decades. The steelmaking industry is still one of the most significant producers of CO2 emissions worldwide. The processes and facilities used at steel plants, such as the blast furnace and the electric arc furnace, generate a large amount of waste heat, which can be recovered and meaningfully used. Another way to reduce CO2 emissions is to reduce the number of low-quality steel products which, due to poor final quality, need to be scrapped. Steel product quality is strongly dependent on the continuous casting process where the molten steel is converted into solid semifinished products such as slabs, blooms, or billets. It was observed that the crack formation can be affected by the water cooling temperature used for spray cooling which varies during the year. Therefore, a proper determination of the cooling water temperature can prevent the occurrence of steel defects. The main idea is based on the utilization of the waste heat inside the steel plant for preheating the cooling water used for spray cooling in the Continuous Casting (CC) process in terms of water temperature stabilization. This approach can improve the quality of steel and contribute to the reduction of greenhouse gas emissions. The results show that, in the case of billet casting, a reduction in the cooling water consumption can be also reached. The presented tools for achieving these goals are based on laboratory experiments and on advanced numerical simulations of the casting process.

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