scholarly journals Study on The Effect of Different Plenum Chamber Coefficients on Frosting of Air-cooler

2021 ◽  
Vol 321 ◽  
pp. 04019
Author(s):  
Bin Liu ◽  
Shengqiang Shi ◽  
Yongshan Liu ◽  
Rachid Bennacer ◽  
Aiqiang Chen ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Velocity Distribution ◽  
System Performance ◽  
Cooling System ◽  
High Humidity ◽  
Refrigeration System ◽  
Environmental Chamber ◽  
Plenum Chamber ◽  
Air Cooler

The performance of the air-cooler in the refrigeration system plays a key role in improving the energy efficiency. Here, the plenum chamber coefficient was defined to study a possible way of enhancing the refrigeration system performance. In order to investigate the influence of the plenum chamber coefficient on the frosting and the cooling system of the chillers, three plenum chamber coefficients (0.74,0.97,1.2) were studied under high humidity. The temperature decreasing curve of the environmental chamber, the velocity distribution of the air cooler, and the frost accumulation under and on the air-cooler were analysed. The results show that the frost accumulation on the tube will increase with the increase of the plenum chamber coefficient and the frost accumulation on the fin will increase at first and then decrease with the increase of the plenum chamber coefficient. On the whole, in this study, frosting is the most obvious when the plenum chamber coefficient was 0.97

scholarly journals Effect of Different Plenum-Chamber Coefficients on the Frosting of Air-Cooler

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 422
Author(s):  
Bin Liu ◽  
Shengqiang Shi ◽  
Yongshan Liu ◽  
Rachid Bennacer ◽  
Aiqiang Chen ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Velocity Distribution ◽  
Cooling System ◽  
Environmental Chamber ◽  
Plenum Chamber ◽  
Air Cooler

The performance of the air-cooler in refrigeration systems plays a key role in their energy efficiency. Here, the plenum-chamber coefficient was defined to investigate a possible way of enhancing the refrigeration coefficient that reflects the efficiency of the system. To investigate the influence of the plenum-chamber coefficient on the frosting and the cooling system of the air-cooler, three plenum-chamber coefficients (0.74, 0.97, 1.2) were studied under two different relative humidities. The temperature decreasing curve of the environmental chamber, the velocity distribution of the air-cooler, and the frost accumulation under and on the air-cooler were analyzed. We find that the homogeneity of the velocity distribution of the air-cooler and the frost accumulation increase with a growing plenum-chamber coefficient, while the frost accumulation on the fin will first increase and then decrease with the increase in the plenum-chamber coefficient. In general, frosting is more present when the plenum-chamber coefficient is 0.97.

Performance studies on vapour compression refrigeration system using PCM placed between wall and coil of the evaporator

2021 ◽  
pp. 095440892110627
Author(s):  
P. Saji Raveendran ◽  
R. Karthikeyan ◽  
P.C. Murugan ◽  
S. Sanjay ◽  
S. Vivek Raj ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Performance Studies ◽  
Energy Efficient ◽  
System Performance ◽  
Phase Change Materials ◽  
Temperature Fluctuations ◽  
Vital Role ◽  
Food Preservation ◽  
Refrigeration System ◽  
Vapour Compression

The vapour compression refrigeration system (VCRS) plays a vital role in the food preservation and it consumes more energy. The use of energy-efficient refrigerants, phase change materials (PCMs) in the condenser and evaporator, and the replacement of existing components, as well as nano-refrigerants, are all efforts made to increase the energy efficiency of the VCRS from different perspectives. Among them, the PCMs play a prominent role and gives sustainable energy efficiency in VCRS. This paper investigates and clarifies the energy efficiency of VCRS can be improved by incorporating a PCM into the evaporator cabin. The experimental results demonstrated substantial effects on system performance such as an improvement in COP of 7.1%, a decrease in per day energy consumption by 6.7%, and comparatively smaller temperature fluctuations within the freezer cabinet. The exergy efficiency is increased and Total Equivalent Warming Impact (TEWI) is decreasing than that of the system without PCM by 7.6 and 7% respectively. This technique is integrated into the VCRS, leading to savings in energy while also being useful for power interruptions common in areas with low grid reliability.

Energy efficiency analysis of a combined cooling system with night radiative cooling

2020 ◽  
Author(s):  
A. P. Tsoy ◽  
A. V. Baranenko ◽  
A. S. Granovsky ◽  
D. A. Tsoy ◽  
R. A. Dzhamasheva
Keyword(s):  
Energy Efficiency ◽  
Cooling System ◽  
Efficiency Analysis ◽  
Radiative Cooling ◽  
Combined Cooling ◽  
Energy Efficiency Analysis

Design and Build of Teaching and Experimental Marine Cold Store

2014 ◽  
Vol 556-562 ◽  
pp. 907-911
Author(s):  
Chang Wei He ◽  
Meng Zhang ◽  
Xiao Ping Jia ◽  
Yuan Liu
Keyword(s):  
Thermal Performance ◽  
System Performance ◽  
Heat Load ◽  
Refrigeration System ◽  
Electrical System ◽  
Technology Application ◽  
Design Scheme ◽  
Expansion Valve ◽  
Cold Store ◽  
Practical Teaching

In the paper, the design scheme of the new cold store is proposed firstly, with the consideration of the latest technology application and the convenience and maneuverability of practical teaching. Then the refrigeration system is designed based on the calculation of the heat load of the cold store. The suited components such as compressor, evaporator, condenser and expansion valve are selected and the electrical system is designed. After that the whole unit is installed and adjusted to make sure that the installation is propitious to improve the system performance and convenient for training. Finally the thermal performance of the new cold store system is tested and compared with the old system test. The result shows that the matching of the new refrigeration system is reasonable and the new cold store is up to the mustard. With the help of training on the cold store, the students will meet the essential requirements of STCW 78/95 convention on application and management of the marine cold store.

scholarly journals CALCULATION OF TEMPERATURE OF ROUTINE WATER COOLED IN IRRIGATED LAYERS

2019 ◽  
Vol 2019 (3) ◽  
pp. 249-255
Author(s):  
N Usmonov ◽  
◽  
Sh Sanayev ◽  
Z Yusupov
Keyword(s):  
Mathematical Model ◽  
Cooling System ◽  
Material Balance ◽  
Polymeric Materials ◽  
Water Supply Systems ◽  
Evaporative Water ◽  
Circulating Water ◽  
Industrial Enterprises ◽  
Air Cooler ◽  
Air Conditioning Systems

The article describes the developed mathematical model, algorithm and program for calculating the process of cooling the water leaving the evaporative cooler and the final temperature of humid air. The compilation of a mathematical model is based on the analysis of literature data. Practically at all industrial enterprises, technological equipment is cooled by means of circulating water supply systems equipped with evaporative coolers. The article made a choice of a cooling system for air conditioning systems of residential premises. The developed basic design scheme of the evaporative water and air cooler with the irrigated layer is presented, as well as the estimated thermal and material balance. One of the main elements of these devices is a heat-mass transfer nozzle - sprinkler. This article presents the results of mathematical modeling of processes occurring in the volume of the sprinkler evaporator chamber, Raschig rings composed of vertical polymeric materials. Expressions are obtained for determining the values of air temperature based on the calculation of thermal modeling of the process of cooling circulating water in evaporative coolers of the type in question.

Sign in / Sign up

Export Citation Format

Share Document