scholarly journals HumidOSH: A self-contained environmental chamber with controls for relative humidity and fan speed

HardwareX ◽  
2020 ◽  
Vol 8 ◽  
pp. e00141 ◽  
Author(s):  
Soon Kiat Lau ◽  
Jeyamkondan Subbiah
Keyword(s):  
Relative Humidity ◽  
Environmental Chamber ◽  
Fan Speed

scholarly journals Biology of Anicla infecta (Ochsenheimer, 1816) (Lepidoptera, Noctuidae, Noctuinae), under laboratory conditions

2001 ◽  
Vol 61 (4) ◽  
pp. 661-666 ◽  
Author(s):  
J. A. TESTON ◽  
A. SPECHT ◽  
E. CORSEUIL
Keyword(s):  
Relative Humidity ◽  
Standard Error ◽  
Lolium Multiflorum ◽  
Economic Importance ◽  
Egg Laying ◽  
Adult Longevity ◽  
Environmental Chamber ◽  
Laboratory Conditions ◽  
The Mean ◽  
Lepidoptera Noctuidae

Larvae of Anicla infecta (Ochsenheimer, 1816) (Noctuidae) feed upon many grasses and may be harmful to cereals and fodder of economic importance. This study was developed aiming to contribute to knowledge of the biology of this species. The rearing was done in an environmental chamber with the following settings: temperature of 25 ± 1ºC; relative humidity of 70% <FONT FACE=Symbol>±</FONT> 10%, and photoperiod of L14: D10. The larvae fed on ryegrass, Lolium multiflorum Lam. The results express the mean and standard error for the length of every stage in days. For each stage we observed the following time of development: egg 3.2 <FONT FACE=Symbol>±</FONT> 0.09; larvae 18.7 <FONT FACE=Symbol>±</FONT> 0.07; pre-pupae 3.3 <FONT FACE=Symbol>±</FONT> 0.04; pupae 12.6 <FONT FACE=Symbol>±</FONT> 0.14; and adult longevity was 12.1 <FONT FACE=Symbol>±</FONT> 1.03. Also the pre-egg-laying period was 4.4 <FONT FACE=Symbol>±</FONT> 0.59; the egg-laying period was 8.1 <FONT FACE=Symbol>±</FONT> 0.84; and the post-egg-laying period was 0.3 <FONT FACE=Symbol>±</FONT> 0.14. The mean number of egg-laying cycles per female was 6.7 <FONT FACE=Symbol>±</FONT> 0.73; that of eggs per cycle was 77.5 <FONT FACE=Symbol>±</FONT> 4.37; and total eggs per female was 521.4 <FONT FACE=Symbol>±</FONT> 47.36.

scholarly journals ANALISIS PANAS KONDENSOR AC SPLIT DENGAN VARIASI PUTARAN FAN UNTUK PENGERINGAN PADI

2020 ◽  
Vol 6 (2) ◽  
pp. 136
Author(s):  
Yudhy Kurniawan ◽  
Kusnandar Kusnandar ◽  
Yusup Nur Rohmat ◽  
Wardika Wardika
Keyword(s):  
Relative Humidity ◽  
Air Conditioning ◽  
Rotation Speed ◽  
The Other ◽  
Drying Process ◽  
Speed Regulation ◽  
Hot Air ◽  
Fan Speed ◽  
Rice Drying

AbstrakPenggunaan Air Conditioning (AC) Split yang biasanya dipakai untuk keperluan pengondisian udara untuk kenyamanan, pada penelitian ini AC Split juga dimanfaatkan untuk pengeringan padi. Pengeringan padi dengan menggunakan AC Split ini merupakan jenis pengerinagn buatan yang mempunyai kelebihan dibanding dengan pengeringan alami yaitu waktu pengeringan yang lebih singkat. Pada AC Split udara panas yang dihasilkan dari kondensor yang dibuang ke lingkungan secara percuma akan dialirkan melalui sebuah saluran udara untuk dimanfaatkan untuk pengeringan padi. Pemanfaatan panas kondensor ini dilakukan untuk untuk mengetahui pengeringan padi dengan menggunakan variasi pengaturan kecepatan fan kondensor. Pada AC Split dilakukan untuk mengetahui laju pengeringan padi dengan kecepatan putaran fan sebesar 450 rpm dan 800 rpm.  Dari hasil data yang didapatkan selama 1,5 jam pada proses pengeringan padi diperoleh besarnya pengeringan padi berkurang sekitar 8% dan 12% untuk putaran fan kondensor 450 rpm dan 800 rpm. Adapun temperatur udara tertinggi dihasilkan oleh panas kondensor adalah sebesar 53,6oC. Adapun kelembaban relatifnya udaranya (Relative Humidity) adalah sebesar 15%.Kata Kunci: Pengeringan padi, AC Split, Panas kondensor, putaran fanAbstractThe use of Split of Air Conditioning (AC) which is usually used for air conditioning for human convenience. However, in this study Split AC is also used for drying rice. Rice drying using Split AC is a type of artificial drying that has an advantage compared to natural consumption, which is shorter drying. In Split AC the hot air generated from the condenser released into the environment is useless will be flowed through the air duct to be used for drying rice. The use of condenser heat is carried out to find out how to grow rice by using variations in the condenser fan speed regulation. In Split AC, it is done to find out the flow of drying with a variation fan rotation speed of 450 rpm and 800 rpm. From the results of the data experiment for taking around 1.5 hours in the drying process obtained 8% and 12% for the 450 rpm and 800 rpm condenser fan rotation each. Although the temperature of the air produced by the condenser heat is 53.6oC and 50.6oC. The other data of relative humidity of the air (Relative Humidity) is 15%.Keywords: Rice driyer, Split AC, condenser heat, fan rotation

Performance of Desiccant Solar Crop Dryers in Makurdi, Nigeria

2019 ◽  
Vol 35 (2) ◽  
pp. 259-270 ◽  
Author(s):  
Isaac N Itodo ◽  
Joshua O Ijabo ◽  
Japheth A Charles ◽  
Nathaniel N Ezeanaka ◽  
Solomon O Akpa
Keyword(s):  
Relative Humidity ◽  
Moisture Absorption ◽  
Drying Rate ◽  
Sun Drying ◽  
Ambient Relative Humidity ◽  
Significant Difference ◽  
Drying Rates ◽  
Fan Speed ◽  
Further Development ◽  
Range Test

Abstract. Dryers in humid tropical locations like Makurdi, Nigeria (Lat. 7°7´N), have not performed significantly better than the open air sun drying of crops because of the high ambient relative humidity that is often not less than 70% all year round, hence the need to use desiccant augmented dryers. The performance of three types of non-regenerative desiccant solar crop dryers was undertaken to determine the best performing dryer configuration for further improvement and use in the location. The dryers developed were the indirect-active desiccant dryer (IADD), direct-active desiccant dryer (DADD), and the direct-passive desiccant dryer (DPDD). The dryers were designed, constructed, and their performance evaluated and compared to open air sun drying (OASD). The drying rate (kg/h) and Dryer Performance Coefficient (DPC) were used to evaluate the performance of the dryers. The active dryers were operated at a fan speed of 1.2 m/s. Moisture absorption rate and % moisture absorbed to its weight were used to evaluate the performance of the desiccant. The desiccant used was a composite of rice husk ash (RHA) and calcium chloride binded with cement in the ratio of 1:1:1 by weight. The analysis of variance (ANOVA) at p = 0.05 was used to determine if there was a significant difference in the measured parameters of the dryers. The Duncan’s New Multiple Range Test (DNMRT) at p = 0.05 was used to separate the means where there was a significant difference. The drying rates were 0.23, 0.19, 0.16, and 0.13 kg/h for the DADD, DPDD, IADD, and OASD, respectively. The drying rate of the OASD was not significantly different from that of the IADD. The DPC was 1.53, 1.40, and 1.15 for the DADD, DPDD, and IADD, respectively. The DPC of the dryers were significantly different. The direct active desiccant dryer had the highest temperature of 45°C, the lowest relative humidity of 50% at the drying unit and the highest rate of moisture absorbed by the desiccant of 0.24 kg/h. The non-regenerative RHA desiccant had maximum moisture absorption of 28% of its weight. The direct active desiccant dryer is recommended for further development for use in humid tropical locations. Keywords: Crop, Desiccant, Dryer, Humid tropic, Performance, Solar.

Measurement of the Thermal Performance of a Custom-Build Single-Phase Immersion Cooled Server at Various High and Low Temperatures for Prolonged Time

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Pratik V. Bansode ◽  
Jimil M. Shah ◽  
Gautam Gupta ◽  
Dereje Agonafer ◽  
Harsh Patel ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Single Phase ◽  
Data Centers ◽  
Operating Cost ◽  
Climatic Conditions ◽  
Junction Temperature ◽  
Dielectric Fluid ◽  
Air Cooling ◽  
Liquid Cooling ◽  
Environmental Chamber

Abstract The next radical change in the thermal management of data centers is to shift from conventional cooling methods like air-cooling to direct liquid cooling to enable high thermal mass and corresponding superior cooling. There has been in the past few years a limited adoption of direct liquid cooling in data centers because of its simplicity and high heat dissipation capacity. Single-phase engineered fluid immersion cooling has several other benefits like better server performance, even temperature profile, and higher rack densities and the ability to cool all components in a server without the need for electrical isolation. The reliability aspect of such cooling technology has not been well addressed in the open literature. This paper presents the performance of a fully single-phase dielectric fluid immersed server over wide temperature ranges in an environmental chamber. The server was placed in an environmental chamber and applied extreme temperatures ranging from −20 °C to 10 °C at 100% relative humidity and from 20 to 55 °C at constant 50% relative humidity for extended durations. This work is a first attempt of measuring the performance of a server and other components like pump including flow rate drop, starting trouble, and other potential issues under extreme climatic conditions for a completely liquid-submerged system. Pumping power consumption is directly proportional to the operating cost of a data center. The experiment was carried out until the core temperature reached the maximum junction temperature. This experiment helps to determine the threshold capacity and the robustness of the server for its applications in extreme climatic conditions.

The Globe Thermometer Response under Varying Thermal Components

1987 ◽  
Vol 31 (12) ◽  
pp. 1341-1344
Author(s):  
C.H. Lee ◽  
J.D. Ramsey
Keyword(s):  
Relative Humidity ◽  
Air Temperature ◽  
Radiant Heat ◽  
Air Velocity ◽  
Environmental Chamber

This study investigates the effect of air velocity and other thermal components on the globe thermometer response. An experiment was conducted in an environmental chamber in order to measure globe temperatures under varying air velocity, relative humidity and air temperature. This study was performed under three different radiant heat levels. It was found that air velocity has a significant effect on the globe thermometer response. This effect is quantified in this study. Neither air temperature nor relative humidity was found to have a significant effect on globe thermometer response.

scholarly journals Evaluation of Turfgrasses for Resistance to Mole Crickets (Orthoptera: Gryllotalpidae)

HortScience ◽  
2000 ◽  
Vol 35 (4) ◽  
pp. 665-668 ◽  
Author(s):  
S.K. Braman ◽  
R.R. Duncan ◽  
W.W. Hanna ◽  
W.G. Hudson
Keyword(s):  
Relative Humidity ◽  
Field Experiments ◽  
Normal Growth ◽  
Environmental Chamber ◽  
Seashore Paspalum ◽  
Mole Cricket ◽  
Paspalum Vaginatum ◽  
Mole Crickets ◽  
The Common

Bermudagrass (Cynodon sp.) and paspalum (Paspalum vaginatum) genotypes were evaluated in laboratory, greenhouse, and field experiments for potential resistance to the common turfgrass pests, tawny mole cricket (Scapteriscus vicinus Scudder) and southern mole cricket (Scapteriscus borellii Giglio-tos). Potential resistance among 21 seashore paspalums to both insects in an environmental chamber at 27 °C, 85% relative humidity, and 15 hours light/9 hours dark) revealed that Glenn Oaks `Adalayd' was least tolerant of cricket injury, while 561-79, HI-1, and `Excalibur' were most tolerant. Nymphal survival was not influenced by turfgrass type. Plant selections that maintained the highest percentage of their normal growth after 4 weeks of feeding by tawny mole crickets over three separate greenhouse trials were 561-79, HI-1, HI-2, PI-509018, `Excalibur', SIPV-1 paspalums, and `Tifeagle' and `Tifsport' bermudagrasses. Although none of the tested genotypes was highly resistant to tawny mole cricket injury, `TifSport' bermudagrass and 561-79 (Argentine) seashore paspalum were most tolerant.

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