scholarly journals A Solar-Energy Method for Reducing Coffee-Drying Costs

1969 ◽  
Vol 47 (4) ◽  
pp. 226-235
Author(s):  
Allan L. Phillips
Keyword(s):  
Solar Energy ◽  
Static Pressure ◽  
Electric Heating ◽  
Operating Costs ◽  
Solar Heat ◽  
Processing Facility ◽  
Heat Collector ◽  
Electricity Costs ◽  
Labor Requirements ◽  
Experimental Processing

1. Modern coffee-processing facilities that have been developed recently have provided the features of low equipment costs and reduced labor requirements, but are somewhat expensive to operate when electric power is used entirely to heat the drying air. 2. The use of solar energy as a heat source was considered, since previous research where solar heat was used to dry other crops indicates that solar heat-collectors could also be used successfully for drying coffee. 3. An experimental processing facility which employs a solar heat-collector was built and operated, and it has been demonstrated that worthwhile reductions in operating costs can be achieved through the use of solar energy. 4. It was concluded that other coffee producers could economically use solar heat-collectors to reduce electricity costs. Drying facilities should be designed using the following as guides: A. Provide 10 square feet of drying-bin area for each 100 hundred-weights of coffee produced yearly. B. Install a fan which will deliver 100 c.f.m. per square foot of bin area against a static pressure of 1-inch water gage. C. Construct the solar heat-collector according to the specifications presented in figure 1. D. Install electric heating elements which provide up to 5,000 w. for each 100 hundred-weights processed yearly.

A Closed-Loop Temperature Control System for the Solar Energy Heat Collector

2012 ◽  
Vol 608-609 ◽  
pp. 22-26 ◽  
Author(s):  
Ming Yun Li ◽  
Yu Ning Zhong ◽  
Jia Bao Cheng
Keyword(s):  
Control System ◽  
Solar Energy ◽  
Temperature Control ◽  
Closed Loop ◽  
Temperature Stability ◽  
Fine Tuning ◽  
Temperature Control System ◽  
Inlet Temperature ◽  
Solar Heat ◽  
Heat Collector

According to GB /T 4271-2007 in regard to the temperature control requirements, we have designed a set of closed loop temperature control system, it uses two levels of temperature control, and it uses LabVIEW PID kit and an external controllable silicon module for secondary heating fine-tuning, the whole system ensures that the solar heat collector inlet temperature stability at the setting value ± 0.1 °C.

scholarly journals Performance enhancement of a baffle-type solar heat collector through CFD simulation study

2021 ◽  
Vol 1195 (1) ◽  
pp. 012040
Author(s):  
A S T Tan ◽  
J Janaun ◽  
H J Tham ◽  
N J Siambun ◽  
A Abdullah
Keyword(s):  
Pressure Drop ◽  
Solar Energy ◽  
Alternative Energy ◽  
Manufacturing Industry ◽  
Cfd Simulation ◽  
Performance Enhancement ◽  
Fluid Dynamic ◽  
Prolonged Heating ◽  
Solar Heat ◽  
Heat Collector

Abstract The application of solar energy conversion has been extensively utilized as an alternative energy source to generate heat. This approach would be a step towards sustainable energy development particularly in the manufacturing industry with energy-intensive process. In this paper, thermal enhancement on the key component of a solar energy device – solar heat collector (SHC), has been evaluated by proposing a baffle-type SHC with various geometric configuration in the air passage namely longitudinal baffle and transversal baffle. The performance of SHC is evaluated in term of efficiency, temperature distribution, airflow pattern and pressure drop across the collector outlet through Computational Fluid Dynamic (CFD) investigation. It was observed that maximum collector efficiency was achieved in the Longitudinal-SHC (L-SHC), with a value of 46.2 % followed by Transversal-SHC (T-SHC) and without baffles. Maximum drying temperature at the collector outlet was 332.43 K for L-SHC, showing temperature rise of 0.35 % and 4.21 % from T-SHC and without baffles, respectively. The velocity vector indicated that turbulence flow was created in the T-SHC which consequently improved the heat transfer. Whereas in L-SHC, enhancement was achieved through the prolonged heating time in the passage. Considering the thermo-hydraulic performance factor evaluated, these enhancement features had diminished the effect of pressure drop.

Glass solar heat collector development

1975 ◽  
Author(s):  
R. GILLETTE ◽  
C. DEMINET ◽  
W. BEVERLY
Keyword(s):  
Solar Heat ◽  
Heat Collector

Electrical Energy Steam Boiler Heat Loss Analysis in Japfa Comfeed Indonesia Tbk, Unit of Sidoarjo

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Joseph Priyandana ◽  
Jamaaluddin Jamaaluddin
Keyword(s):  
Heat Loss ◽  
Animal Feed ◽  
Electrical Energy ◽  
Operating Costs ◽  
Steam Boiler ◽  
Android Application ◽  
Loss Analysis ◽  
Feed Industry ◽  
Calculation Process ◽  
Electricity Costs

In the animal feed industry, steam is used in pellet making machines. In this process, steam from the boiler is distributed to the pellet mill through the pipe. The purpose of this study is to observe the waste of electricity costs of operating a boiler by calculating heat loss in a distribution pipe. The method of assessing heat loss is done by calculating losses caused by heat loss in the boiler distribution. Then make a calculation application model based on the data obtained. From the data analyzed, the amount of heat lost in the non-insulating distribution pipe is 0.766 kJ/s with a loss of Rp 5.628,600 operating costs per month compared to heat loss in an isolated pipe condition of 0.047 kJ/s with losses which cost slightly more than Rp 368 190 / month. This heat loss calculation process is made on an android application by entering the calculation formula on the program and the data that has been obtained.

The Comparison of CFD Flow Field between Slope Solar Energy Power Plant and Traditional Solar Chimney Power Generating Equipment

2013 ◽  
Vol 561 ◽  
pp. 614-619 ◽  
Author(s):  
Qing Ling Li ◽  
Xiao Qing Xie ◽  
Jun Chao ◽  
Xuan Xin ◽  
Yan Zhou
Keyword(s):  
Power Plant ◽  
Velocity Field ◽  
Solar Energy ◽  
Numerical Study ◽  
Solar Chimney ◽  
Heat Collector ◽  
Fluent Software ◽  
Generating Equipment ◽  
The Cost ◽  
Power Generating Equipment

A numerical study with FLUENT software has been carried out as to air performance in the slope solar energy power plant. The velocity field, temperature and pressure fields in the solar chimney, and the simulated result were compared with the simulated result of traditional solar chimney power generating equipment. The simulation results show that distribution of the temperature field and the velocity field in slope solar energy power plant and traditional solar chimney power generating equipment. In the case of the same height, the velocity of traditional is slightly larger than the slope style's, but there is little difference. In order to achieve the same power generation effect, the overall height of slope style is more than the traditional style, but the vertical chimney height of traditional style is greater than the slope style. The cost of construction of vertical chimney is expensive, and many problems have been considered, like radix saposhnikoviae and earthquake prevention, the heat collector also need to be cleaned on time. The slope style can take full advantage of land, the height of vertical chimney will be reduced, so the construction of the chimney will be relatively easy. Rainwater can clean the heat collector when it runs down from it. All things considered. The slope solar energy power plant has more development prospects.

Utilizing jet impingement on protrusion/dimple heated plate to improve the performance of double pass solar heat collector

2021 ◽  
Author(s):  
Mohammad Salman ◽  
Ranchan Chauhan ◽  
Ganesh kumar Poongavanam ◽  
Myeong Hyun Park ◽  
Sung Chul Kim
Keyword(s):  
Jet Impingement ◽  
Heated Plate ◽  
Double Pass ◽  
Solar Heat ◽  
Heat Collector

scholarly journals Temperature Measurements on a Solar and Low Enthalpy Geothermal Open-Air Asphalt Surface Platform in a Cold Climate Region

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 979 ◽  
Author(s):  
Caner Çuhac ◽  
Anne Mäkiranta ◽  
Petri Välisuo ◽  
Erkki Hiltunen ◽  
Mohammed Elmusrati
Keyword(s):  
Heat Flux ◽  
Urban Areas ◽  
Storage System ◽  
Energy Resource ◽  
Cold Climate ◽  
Solar Irradiation ◽  
Solar Heat ◽  
Heat Collector ◽  
One Year

Solar heat, already captured by vast asphalt fields in urban areas, is potentially a huge energy resource. The vertical soil temperature profile, i.e., low enthalpy geothermal energy, reveals how efficiently the irradiation is absorbed or radiated back to the atmosphere. Measured solar irradiation, heat flux on the asphalt surface and temperature distribution over a range of depths describe the thermal energy from an asphalt surface down to 10 m depth. In this study, those variables were studied by long-term measurements in an open-air platform in Finland. To compensate the nighttime heat loss, the accumulated heat on the surface should be harvested during the sunny daytime periods. A cumulative heat flux over one year from asphalt to the ground was 70% of the cumulative solar irradiance measured during the same period. However, due to the nighttime heat losses, the net heat flux during 5 day period was only 18% of the irradiance in spring, and was negative during autumn, when the soil was cooling. These preliminary results indicate that certain adaptive heat transfer and storage mechanisms are needed to minimize the loss and turn the asphalt layer into an efficient solar heat collector connected with a seasonal storage system.

Operation Conditions Analysis on Solar Energy Compression-Injection Secondary Refrigeration System

2012 ◽  
Vol 178-181 ◽  
pp. 139-143
Author(s):  
Fei Fei Zhang ◽  
Qi Tian ◽  
Li Yuan Yin
Keyword(s):  
Solar Energy ◽  
Injection System ◽  
Condensation Temperature ◽  
Economic Factors ◽  
Refrigeration System ◽  
Cooling Temperature ◽  
Evaporation Temperature ◽  
Operation Conditions ◽  
Heat Collector ◽  
Intermediate Cooling

The COP of compression-injection secondary refrigeration system is increased by 20%-50% than traditional compression-injection system. This paper analyzes the operation conditions on generation temperature, intermediate cooling temperature, condensation temperature and evaporation temperature in the compression-injection secondary refrigerating system powered by solar energy. Comprehensively considering technical and economic factors, the results show that generation temperature should be increased and condensation temperature should be decreased. In addition, the area of solar heat collector and the COP of the system should be considered when we chose the intermediate cooling temperature.

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