Analysis of temperature distribution according to the vertical air circulation fans in greenhouse

2021 ◽  
Vol 3 (4) ◽  
Keyword(s):  
Temperature Distribution ◽  
Air Circulation

scholarly journals TEMPERATURE DISTRIBUTION AND AIR CIRCULATION IN AN URBAN CANYON

1988 ◽  
Vol 61 (7) ◽  
pp. 541-559 ◽  
Author(s):  
Ikuo TASAKA ◽  
Hideo TAKAHASHI ◽  
Hiroshi SHITARA
Keyword(s):  
Temperature Distribution ◽  
Urban Canyon ◽  
Air Circulation

Numerical Investigation of Heat Transfer and Flow Field in Domestic Refrigerators

2013 ◽  
Author(s):  
Chaolei Zhang ◽  
Yongsheng Lian
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Stokes Equations ◽  
Transfer Problem ◽  
Radiation Heat Transfer ◽  
Circulation Pattern ◽  
Boussinesq Approximation ◽  
Navier Stokes ◽  
Air Circulation ◽  
The Impact

Air circulation and temperature distribution inside a domestic refrigerator chamber are two important factors in refrigerator design. They are critical for food quality control and energy saving and are affected by natural/forced convection, radiation and layout of the stored food. Knowledge about the actual air flow and temperature distributions inside a refrigerator is required to improve temperature homogeneity and reduce energy consumption. In present work we numerically study the air circulation and the heat transfer phenomena in a domestic frost-free refrigerator. The inner compartment, the evaporator and the outside thermal insulation foam are considered. The conjugate heat transfer problem is studied by solving the unsteady laminar Navier-Stokes equations using a finite volume method. The Boussinesq approximation is used to model the natural convection. The discrete ordinate method is adopted to take into account the radiation heat transfer between the cold back evaporator and warm surfaces to further understand the impact of radiation. The accuracy of the numerical methods is verified through grid sensitivity analysis and comparison with available numerical and experimental data. Comparisons are made with and without radiation. Our simulations show that radiation significantly changes the temperature distribution and air circulation pattern. The effects of shelf and food stored on the temperature distribution and air circulation are also studied by comparing three configurations: empty refrigerator, empty refrigerator with shelves and loaded refrigerator with food.

scholarly journals KAJIAN KENYAMANAN RUANG KULIAH TN II JURUSAN TEKNIK FISIKA UNIVERSITAS GADJAH MADA (UGM) DITINJAU DARI ASPEK TERMAL DAN POLA ALIRAN UDARA MENGGUNAKAN FLUENT

2016 ◽  
Vol 2 (2) ◽  
Author(s):  
Sunanto Sunanto ◽  
Karsid Karsid
Keyword(s):  
Temperature Distribution ◽  
Temperature Variation ◽  
Air Temperature ◽  
Geometric Modeling ◽  
Air Flow ◽  
Model Testing ◽  
Velocity Variation ◽  
Air Velocity ◽  
Free Air ◽  
Air Circulation

Temperature and air circulation is an important factor in a building since it is closely related to health comfort. Therefore, the design of a building should be carry out precisely in getting a clean, healthy and comfortable air circulation in accordance to the requirement of the room.In order to carried out a good building designing, a research was needed to understand temperature distribution, the pattern of air flow and its velocity. In this research, a Classroom of TN II JTF UGM. This classroom have 1030 cm length, 790 cm of width, and 330 cm of height. The size of the windows is 100 x 100 cm and place 1m from the floor. The size of the doors is 140 x 210 cm. The windows are assumed to be widely open, the door always opened. The researched begins with geometric modeling of the model by using Gambit 2.2.30 and continued with model testing using Fluent 6.2.16. The test is carried out by giving three velocity variation of free air flowing i.e.: from 1.3 m/s, 3.61 m/s and 5.92 m/s, two direction variation of open air flowing and two variation temperature of free air i.e.: 21.50C and 27.650C.The standard of comfortable air velocity used in the room is 0.15 < V < 0.25 m/s, The standard of comfortable temperature used in the room is 20.50C and 27.10C. The air velocity and air temperature variation created comfort area and non comfort area in the room .The direction circulation of air variation created the different pattern air circulation in the room.

scholarly journals Cooling Performance Analysis of the Lab-Scale Hybrid Oyster Refrigeration System

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 899 ◽  
Author(s):  
Xuejun Qian ◽  
Yulai Yang ◽  
Seong W. Lee ◽  
Marc J. L. Caballes ◽  
Oludayo S. Alamu
Keyword(s):  
Temperature Distribution ◽  
Operating Conditions ◽  
Cooling Time ◽  
Maximum Temperature ◽  
Refrigeration System ◽  
Uniform Temperature ◽  
Maximum Temperature Difference ◽  
Cooling Performance ◽  
Uniform Temperature Distribution ◽  
Air Circulation

Compared with the waste-to-heat and electricity-based hybrid refrigeration system, the innovative lab-scale refrigeration system integrated with the DC and AC cooling units that able to use solar and electricity as energy resources. Previous studies found that temperature control and uniform temperature distribution in refrigeration systems are both critical factors reducing vibrio growth on raw oysters and saving energy consumption. Therefore, this refrigeration system also equipped a specially designed divider and was used to test various air circulation strategies to achieve uniform temperature distribution in six individual compartments. The objective is to investigate and evaluate the effects of air circulation strategies and operating conditions on the cooling performance, including temperature distribution, standard deviation of compartment temperatures, and cooling time using a factorial design method. Results indicated the maximum temperature difference between the compartments was 8.9 ± 2.0 °C, 6.7 ± 2.0 °C, and 4.8 ± 2.0 °C in the scenarios of no air circulation, natural air circulation, and combined natural and forced air circulation, respectively. The interaction of fan location and fan direction showed a significant effect on the compartment temperatures while there was no significant effect on cooling time. A circulation fan on the lower part of the 12-volt section with an air supply from the 12- to 110-volt section was determined as the optimal condition to achieve relatively uniform temperature distribution. Refrigeration system also achieved a cooling temperature of 7.2 °C within 150 min to meet regulations. To that end, the innovative hybrid oyster refrigeration system will benefit oyster industries, as well as the aquaculture farmers in terms of complying with regulations and energy savings.

scholarly journals Development of CFD model for analyzing the air flow and temperature distribution in greenhouse with air-circulation fans

2014 ◽  
Vol 41 (4) ◽  
pp. 461-472 ◽  
Author(s):  
In-Ho Yu ◽  
Nam-Kyu Yun ◽  
Myeong-Whan Cho ◽  
Hee-Ryong Ryu ◽  
Doo-Gyung Moon
Keyword(s):  
Temperature Distribution ◽  
Air Flow ◽  
Cfd Model ◽  
Air Circulation

Influence of tool nature and coating on the temperature distribution during chip formation in orthogonal cutting of steels

1997 ◽  
Vol 85 (9-10) ◽  
pp. 37-42 ◽  
Author(s):  
R. M’Saoubi ◽  
C. Le Calvez ◽  
J.L. Lebrun
Keyword(s):  
Temperature Distribution ◽  
Chip Formation ◽  
Orthogonal Cutting

Temperature distribution of boron-manganese sheet metal blank by induction heating in application for hot stamping

Engineering ◽  
2014 ◽  
Vol 12 (5) ◽  
pp. 21 ◽  
Author(s):  
Ya Xu ◽  
Peixing Liu ◽  
Zijian Wang ◽  
Yisheng Zhang
Keyword(s):  
Temperature Distribution ◽  
Sheet Metal ◽  
Induction Heating ◽  
Hot Stamping ◽  
Metal Blank
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