scholarly journals Modified horizontal solar collector for low temperature grain drying

1980 ◽  
Author(s):  
Keyword(s):  
Low Temperature ◽  
Solar Collector ◽  
Grain Drying

Low Temperature Grain Drying with Solar Heat

1978 ◽  
Vol 21 (1) ◽  
pp. 0170-0175 ◽  
Author(s):  
H. H. Converse ◽  
G. H. Foster ◽  
D. B. Sauer
Keyword(s):  
Low Temperature ◽  
Solar Heat ◽  
Grain Drying

Heat Pump for Low-Temperature Grain Drying

1983 ◽  
Vol 26 (4) ◽  
pp. 1234-1238 ◽  
Author(s):  
M. R. Hogan ◽  
D. L. Ayers ◽  
R. E. Muller ◽  
Jr. ◽  
G. H. Foster ◽  
...  
Keyword(s):  
Low Temperature ◽  
Heat Pump ◽  
Grain Drying

Determination of Heat Transfer Characteristics of Solar Thermal Collectors as Heat Source for a Residential Heat Pump

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Maarten G. Sourbron ◽  
Nesrin Ozalp
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Low Temperature ◽  
Heat Source ◽  
Heat Pump ◽  
Solar Collector ◽  
Heat Transfer Characteristics ◽  
Pump System ◽  
Heat Pump System ◽  
Temperature Heat

With reducing energy demand and required installed mechanical system power of modern residences, alternate heat pump system configurations with a possible increased economic viability emerge. Against this background, this paper presents a numerically examined energy feasibility study of a solar driven heat pump system for a low energy residence in a moderate climate, where a covered flat plate solar collector served as the sole low temperature heat source. A parametric study on the ambient-to-solarfluid heat transfer coefficient was conducted to determine the required solar collector heat transfer characteristics in this system setup. Moreover, solar collector area and storage tank volume were varied to investigate their impact on the system performance. A new performance indicator “availability” was defined to assess the contribution of the solar collector as low temperature energy source of the heat pump. Results showed that the use of a solar collector as low temperature heat source was feasible if its heat transfer rate (UA-value) was 200 W/K or higher. Achieving this value with a realistic solar collector area (A-value) required an increase of the overall ambient-to-solarfluid heat transfer coefficient (U-value) with a factor 6–8 compared to the base case with heat exchange between covered solar collector and ambient.

scholarly journals The use of solar plants for crop seeds drying

2021 ◽  
Vol 46 (4) ◽  
pp. 1-9
Author(s):  
Aleksey Kupreenko ◽  
Khafiz Isaev ◽  
Yury Kuznetsov ◽  
Stanislav Mikhailichenko ◽  
Igor Kravchenko ◽  
...  
Keyword(s):  
Solar Collector ◽  
Weather Conditions ◽  
Grain Storage ◽  
Exhaust Pipe ◽  
Solar Drying ◽  
Night Time ◽  
Adverse Weather Conditions ◽  
Solar Dryer ◽  
Adverse Weather ◽  
Grain Drying

A grain drying complex based on solar energy, including a grain storage with a built-in solar drying system and a drum solar dryer for grain, is proposed. The construction and principle of operation of the grain drying complex is described. The basis of each of the solar drying systems of the complex is the presence of two solar collectors, one of which provides heating of the drying agent at the inlet into the drying chamber, and the second-heating of the used drying agent in the exhaust pipe to increase its flow rate and, accordingly, the intensification of grain drying. Availability of gravel or water heat accumulators allows to carry out the process of grain drying or grain storage, at night and under adverse weather conditions without the risk of self-heating. The optimum capacity of the gravel accumulator is 0.5-0.75 m 3 per 1 m 2 of solar collector area. Drum solar dryer provides guaranteed drying of a grain batch for 6-7 hours of the day time and a grain batch for the night time. It was found that the optimum thickness of the grain layer in the drying process is 50-70 cm and specific load is up to 100 kg of grain per square meter of the horizontal solar collector area.

scholarly journals Assessment of a Low Temperature Closed-Cycle Grain Drying System

2019 ◽  
Vol 8 (2) ◽  
pp. 80
Author(s):  
Mingjun Ma ◽  
Kurt A. Rosentrater
Keyword(s):  
Seed Germination ◽  
Low Temperature ◽  
Drying Methods ◽  
Water Removal ◽  
Closed Cycle ◽  
Pump System ◽  
Heat Pump System ◽  
Grain Drying ◽  
Drying System ◽  
Drying Efficiency

This study analyzed the drying efficiency of a prototype low temperature closed-cycle grain drying system. The main principle of this drying system was the heat pump system working as a dehumidifier. The main component of this drying equipment included a compressor, a condenser, twin evaporators, and a fan. Two drying studies (denoted as trial 1 and trial 2) were conducted to assess the overall drying performance of this low temperature drying system. To calculate the drying efficiency, the total energy consumption was divided by the amount of water removal for each trial; the drying efficiency was reported in the form of Btu/lb of water removal. We also tested corn seed germination to determine if this drying process had an effect on seed germination performance. The drying efficiency results for trial 1 and 2 were 1036 Btu/lb water removal and 869 Btu/lb water removal, respectively; compared to other on-farm drying methods this drying system had fairly high drying efficiency. The germination test results showed that this drying system had no adverse effect on germination performance.

Technical and economical valuation on the coupling of a low temperature multiple effect (LTME) plant to solar collector systems

Desalination ◽  
1979 ◽  
Vol 31 (1-3) ◽  
pp. 457-468 ◽  
Author(s):  
Gasparini ◽  
Giuffrida ◽  
Zanelli ◽  
Migliorini ◽  
Franzosi
Keyword(s):  
Low Temperature ◽  
Solar Collector ◽  
Multiple Effect

Performance Analysis of the Low-Temperature Solar-Boosted Power Generation System—Part I: Comparison Between Kalina Solar System and Rankine Solar System

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
Faming Sun ◽  
Yasuyuki Ikegami ◽  
Hirofumi Arima ◽  
Weisheng Zhou
Keyword(s):  
Power Generation ◽  
Solar System ◽  
Low Temperature ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Solar Collector ◽  
Operating Conditions ◽  
Kalina Cycle ◽  
Solar Systems

On the base of the two classical thermodynamic cycles (Kalina cycle and Rankine cycle), solar-boosted Kalina system (Kalina solar system) and solar-boosted Rankine system (Rankine solar system) with traditional nonconcentrating flat plate solar collector (FPSC) and evacuated tube solar collector (ETSC) are investigated in the present paper. The proposed solar systems are considered to be the hybrid of power generation subcycle and solar collector subcycle. Their electricity generating performances are compared under their respective optimal operating conditions to clarify which one is more competitive in solar utilization. Results show that ETSC is the better choice for the both solar systems. Further, the performance comparison shows that the low-temperature solar energy utilized in Kalina cycle is predominant to generate electricity. Meanwhile, the study also find that mass flow rate of the power generation subcycle, mass flow rate of the solar collector subcycle, mass fraction of ammonia and the regenerator performance are important operational parameters for high performance of the Kalina solar system. Finally, with the aid of the weather conditions of Kumejima Island in Japan, the perceptual knowledge for Kalina solar system by using an application case is shown in the paper.

A solar collector and a cogenerator for low-temperature air heating

1985 ◽  
Vol 4 ◽  
pp. 285-304
Author(s):  
Giovanni Riva ◽  
Fabrizio Mazzetto
Keyword(s):  
Low Temperature ◽  
Solar Collector ◽  
Air Heating

Energy Usage for Low Temperature Grain Drying with Optimized Management

1983 ◽  
Vol 26 (2) ◽  
pp. 0594-0600 ◽  
Author(s):  
D. G. Colliver ◽  
R. M. Peart ◽  
R. C. Brook ◽  
J. R. Barrett ◽  
Jr.
Keyword(s):  
Low Temperature ◽  
Energy Usage ◽  
Grain Drying
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