scholarly journals Adding a Bypass to Ensure the Chemical Plant Production

2016 ◽  
Vol 8 (3) ◽  
pp. 50
Author(s):  
Deming Wang ◽  
Ying Peng ◽  
Zexi Wang
Keyword(s):  
Low Temperature ◽  
Water Temperature ◽  
Cooling Water ◽  
Chemical Plant ◽  
Water Circulation ◽  
Plant Production ◽  
Economic Losses ◽  
Water Filter ◽  
Thermodynamics Analysis ◽  
Chilled Water

<p>The chilling output of the chiller fluctuated according to the chilling load. When it dropped down below a certain value, the temperature of the supply chilled water flowing out of the chiller would drop down too much. And this would result the chiller being shut down abnormally, because of its low temperature protection. Any this shutdown of the chiller endangered the production continuity and security, and caused a certain economic losses. A bypass, which was from the outlet of the chiller’s condenser to the chilled water filter inlet, was added to the chilling system. Through this bypass, some cooling water was introduced from the cooling water circulation into the chilled water circulation. Then the temperature of the supply chilled water flowing out of the chiller was promoted. With experiments, and by the aid of thermodynamics analysis, the amount of introduced cooling water, which could be introduced to promote the supply chilled water temperature for maintaining the chiller running normally, was researched. Ultimately, a certain amount of introduced cooling water, at which the chiller would no longer stop abnormally at any chilling load, was determined. And the energy lose caused by the introduced cooling water was less than 5 percent the rated output of the chiller. Compared with the chiller rated output, this energy lose was so small that it could be neglected.</p>

Experimental Studies on a Solar Low Temperature Multi-Effect Distillation Desalination System

2014 ◽  
Vol 953-954 ◽  
pp. 20-23
Author(s):  
Dong Dong Feng ◽  
Xiao Bin Pei ◽  
Feng Ming Zhang ◽  
Yun Mo Zhao ◽  
Wei Yang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Solar Radiation ◽  
Water Temperature ◽  
Production Rate ◽  
Experimental Studies ◽  
Cooling Water ◽  
Water Production ◽  
Cooling Water Temperature ◽  
Water Production Rate ◽  
High Level

Solar energy has been widely used in desalination systems. A low-temperature multi-effect desalination system driven by solar is constructed for a series of experimental studies. The results show that water production rate grows with solar radiation, and maintains at a high level between 12am to 4pm. The optimized heat water flow is 1400 kg/h and appropriate cooling water temperature is 24 °C, respectively.

Optimum Control Strategy for a Low-Temperature Solar Kalina Cycle Power Generation Under Off-Design Conditions

2017 ◽  
Author(s):  
Jianyong Wang ◽  
Yunho Hwang ◽  
Jiangfeng Wang ◽  
Yiping Dai
Keyword(s):  
Power Generation ◽  
Low Temperature ◽  
Heat Source ◽  
Water Temperature ◽  
Cooling Water ◽  
Pressure Regulation ◽  
Kalina Cycle ◽  
Cooling Water Temperature ◽  
Regulation Method ◽  
Sliding Pressure

Low-temperature Kalina cycle power generation system shows great potential in the region of solar energy utilization. The variation in solar radiation affects the heat source temperature of Kalina cycle, and additionally the cooling water temperature also varies with the seasons. In this paper, the mathematical model of a Kalina cycle used for low-temperature solar power generation is established to investigate the off-design performance of the Kalina cycle under off-design heat source and cooling water temperature using three control strategies including constant pressure regulation method, sliding pressure regulation method and modified sliding pressure regulation method. The results show that when the heat source temperature varies, the modified sliding pressure regulation method could keep the cycle performance and the efficiencies of turbine and pump at a relatively high value, and it could be applied in a wider range of heat source temperature. When the cooling water temperature varies, different control strategies have similar influence on the variations of the cycle performance and the efficiencies of turbine and pump. Based on performance comparison, the modified sliding pressure regulation method is determined to be the optimum control strategy for the Kalina cycle under off-design conditions.

A low-temperature multi-effect desalination system powered by the cooling water of a diesel engine

Desalination ◽  
2017 ◽  
Vol 404 ◽  
pp. 112-120 ◽  
Author(s):  
Fengming Zhang ◽  
Shiming Xu ◽  
Dongdong Feng ◽  
Shunquan Chen ◽  
Ruxu Du ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Cooling Water

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.

Experimental Investigation of a Pilot Compression Chiller With Alternatives Refrigerants R401a and R134a

2005 ◽  
Author(s):  
M. Fatouh
Keyword(s):  
Experimental Investigation ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Water Mass ◽  
Cooling Water ◽  
Cooling Capacity ◽  
Inlet Temperature ◽  
Chilled Water ◽  
Water Mass Flow Rate

This paper reports the results of an experimental investigation on a pilot compression chiller (4 kW cooling capacity) working with R401a and R134a as R12 alternatives. Experiments are conducted on a single-stage vapor compression refrigeration system using water as a secondary working fluid through both evaporator and condenser. Influences of cooling water mass flow rate (170–1900 kg/h), cooling water inlet temperature (27–43°C) and chilled water mass flow rate (240–1150 kg/h) on performance characteristics of chillers are evaluated for R401a, R134a and R12. Increasing cooling water mass flow rate or decreasing its inlet temperature causes the operating pressures and electric input power to reduce while the cooling capacity and coefficient of performance (COP) to increase. Pressure ratio is inversely proportional while actual loads and COP are directly proportional to chilled water mass flow rate. The effect of cooling water inlet temperature, on the system performance, is more significant than the effects of cooling and chilled water mass flow rates. Comparison between R12, R134a and R401a under identical operating conditions revealed that R401a can be used as a drop-in refrigerant to replace R12 in water-cooled chillers.

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