FEASIBILITY OF ICE-SLURRY APPLICATION TO THE DISTRICT COOLING SYSTEM IN KOREA

2014 ◽  
Vol 22 (03) ◽  
pp. 1450018 ◽  
Author(s):  
JAE DONG CHUNG ◽  
SEUNG-JAE MOON ◽  
YOON-PYO LEE ◽  
JAE-HEON LEE ◽  
CHANG-JUN LEE ◽  
...  
Keyword(s):  
Cooling System ◽  
Building Blocks ◽  
Cooling Capacity ◽  
Pipeline System ◽  
Ice Slurry ◽  
High Rise ◽  
Precise Estimation ◽  
System Flow ◽  
Cooling Loads ◽  
Facility Capacity

The district-cooling system (DCS) has been in service in Sang-am in Seoul, Korea since 2005. The capacity of the DCS facility in Sang-am was 111 Gcal/h in 2011, and an additional 63 Gcal/h capacity is planned for installation by 2025. However, the cooling demand has increased due to unexpected high-rise building blocks, and the required facility capacity is expected to be 101 Gcal/h. Adding a new building plan to the existing plant is difficult. This study centers on a feasibility study for the new requirement under the restrictions of existing pipelines, limited space and regulations on the use of electric-driven chillers in Korea, etc. The precise estimation of the diversity factor is essential to determine the required capacities. To this end, each building in the district area was categorized, and the cooling loads were measured for the summer seasons of 2010 and 2011. The large energy capacity of an ice-slurry can potentially increase the cooling capacity in existing plants while maintaining the same flow rate and pumping power. Thus introducing an ice-slurry is expected to be a potential solution to the significantly increased cooling load under the restriction of existing pipeline system without requiring increases in pipe size or system flow rates.

Feasibility Study for Ice-Slurry to District Cooling System in Korea

2013 ◽  
Author(s):  
Jae Dong Chung ◽  
Yoon-Pyo Lee ◽  
Hoseon Yoo ◽  
Jae-Heon Lee ◽  
Chang-Jun Lee ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Cooling System ◽  
Building Blocks ◽  
Cooling Capacity ◽  
Pipeline System ◽  
Ice Slurry ◽  
High Rise ◽  
Precise Estimation ◽  
Cooling Loads ◽  
Facility Capacity

The district-cooling system (DCS) was in service in Sang-am in Seoul, Korea after 2005. The facility capacity of the DCS in Sang-am is 111Gcal/h at 2011 and 63Gcal/h of facility is planned to install till 2025. However, the cooling demand is increased due to new high-rise building blocks, and the required facility capacity is expected to be 101Gcal/h. A difficulty comes from building new plan in the existing plant. This paper is on the feasibility study for the new requirement under the restrictions of existing pipeline, limited space and regulation on the usage of electric driven chiller. Precise estimation of the diversity factor is essential to determine the required capacities. For this, every building in the area was categorized and the cooling loads were measured for the summer seasons of 2010 and 2011. The large energy capacity of ice slurry can potentially increase the cooling capacity in existing plants while maintaining the same flow rate and pumping power. Thus under the restriction of existing pipeline system, introducing ice slurry is expected as potential solution to the significantly increased cooling load without requiring increases in pipe size or system flow rates.

A simplified method of temperature control maximizing productivity of the batch reactor; The effect of inertia of the cooling system

1982 ◽  
Vol 47 (2) ◽  
pp. 454-464 ◽  
Author(s):  
František Jiráček ◽  
Josef Horák
Keyword(s):  
Mathematical Model ◽  
Temperature Control ◽  
Cooling System ◽  
Batch Reactor ◽  
Exothermic Reaction ◽  
Cooling Capacity ◽  
Variable Activity ◽  
Simplified Method ◽  
Opening And Closing ◽  
Time Of Operation

The effect has been studied of the inertia of the cooling system on the reliability of control of the temperature of the reaction mixture. The study has been made using a mathematical model of the batch reactor with an exothermic reaction. The temperature has been controlled by a two-level controller opening and closing the flow of the coolant. The aim of the control has been to maintain a constant value of the degree of utilization of the cooling capacity of the reactor. The instantaneous value of the degree of utilization has been assessed from the ratio of times for which the cooling system is idle to the time of operation. The reliability of control has been studied for variable activity of the catalyst.

Rechargeable Personal Air Conditioning Device

2016 ◽  
Author(s):  
Yilin Du ◽  
Jan Muehlbauer ◽  
Jiazhen Ling ◽  
Vikrant Aute ◽  
Yunho Hwang ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Cooling System ◽  
Cooling Capacity ◽  
Comfort Level ◽  
Vapor Compression ◽  
Air Conditioning System ◽  
System A ◽  
Single Person ◽  
Vapor Compression Cycle ◽  
Compression Cycle

A rechargeable personal air-conditioning (RPAC) device was developed to provide an improved thermal comfort level for individuals in inadequately cooled environments. This device is a battery powered air-conditioning system with the phase change material (PCM) for heat storage. The condenser heat is stored in the PCM during the cooling operation and is discharged while the battery is charged by using the vapor compression cycle as a thermosiphon loop. The conditioned air is discharged towards a single person through adjustable nozzle. The main focus of the current research was on the development of the cooling system. A 100 W cooling capacity prototype was designed, built, and tested. The cooling capacity of the vapor compression cycle measured was 165.6 W. The PCM was recharged in nearly 8 hours under thermosiphon mode. When this device is used in the controlled built environment, the thermostat setting can be increased so that building air conditioning energy can be saved by about 5–10%.

scholarly journals Application of Ultrasonic Atomization in a Combined Circulation System of Spray Evaporative Cooling and Air Cooling for Electric Machines

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1773
Author(s):  
Yu Wang ◽  
Lin Ruan
Keyword(s):  
Cooling System ◽  
Evaporative Cooling ◽  
Convection Heat Transfer ◽  
Cooling Capacity ◽  
Circulation System ◽  
Air Cooling ◽  
Test Model ◽  
Ultrasonic Atomization ◽  
System A ◽  
Air Circulation

A combined circulation system of spray evaporative cooling and air cooling (CCSSECAC) is a way to enhance the cooling performance of an air-cooled electric machine while maintaining its existing structure. Based on a traditional air-cooled machine, when the discrete evaporative cooling medium particles are scattered into the airflow, they will reach the heat source with the air circulation. The cooling capacity of the cooling system is enhanced simultaneously through the phase transition and convection heat transfer. Ultrasonic atomization is a simple way to produce tiny droplets and a good way to improve the performance of CCSSECAC. To verify the effectiveness of such a system, a principle test model was built and a multi-operational condition experiment was carried out as an exploratory study. The experimental results showed that the new cooling system was feasible for horizontal machines, and the stator coil temperature was significantly reduced compared with the air-cooled mode.

scholarly journals Effect of Hot Water Setting Temperature on Performance of Solar Absorption-Subcooled Compression Hybrid Cooling Systems

2019 ◽  
Vol 10 (1) ◽  
pp. 258 ◽  
Author(s):  
Jinfang Zhang ◽  
Zeyu Li ◽  
Hongkai Chen ◽  
Yongrui Xu
Keyword(s):  
Cooling System ◽  
Hot Water ◽  
Operation Performance ◽  
Solar Absorption ◽  
Point Temperature ◽  
Set Point ◽  
Cooling Period ◽  
High Rise ◽  
Hybrid Cooling ◽  
The Impact

The solar absorption-subcooled compression hybrid cooling system (SASCHCS) displays outstanding advantages in high-rise buildings. Since the performance coupling of collectors and absorption subsystems is stronger due to the absence of backup heat and the effect of generator setting temperature has not been realized adequately, it is highly important to study the relationship of SASCHCS operation and the set point temperature of hot water to prevent performance deterioration by inappropriate settings. Therefore, the paper mainly deals with the effect of collector and generator setting temperature. The investigation was based on the entire cooling period of a typical high-rise office building in subtropical Guangzhou. The off-design model of hybrid systems was built at first. Subsequently, the impact mechanism of setting temperature in two hot water cycles on facility operation was analyzed. It was found that the excessive rise of collector setting temperature deteriorated the energy saving, while the appropriate improvement of generator set point temperature was beneficial for the solar cooling. Besides, global optimization by the genetic algorithm displayed that 71.6 °C for the collector setting temperature with 64.5 °C for the generator was optimal for annual operation. The paper is helpful in enhancing the operation performance of SASCHCS.

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