Ergün, Alper | Ceylan, İlhan | Acar, Bahadır | Erkaymaz, Hande

Article | 2017 | DRYING TECHNOLOGY35 ( 14 ) , pp.1711 - 1720

In this study, a temperature-controlled solar air collector was designed and tested for drying. Solar drying systems have two disadvantages. First one is the lack of ability to store energy and the second one is the lack of temperature control. This study presents the experimental analysis of an air collector that is able to keep the drying air temperature at 40 degrees C even in cases where the level of solar radiation received by the collectors changes. Most of the tests were performed at a solar radiation level ranging from 500 to 900W/m(2) and at an air flow of 3 to 5m/s. The system tested for drying three different crops separa . . .tely performed 21h of a total of 27-h drying period at or above the temperature set of 40 degrees C. The thermodynamic analysis of the relationship between solar radiation, air temperature, flow, and the produced energy was performed. The relationship between productivity, energy produced, and set temperature was analyzed using distribution charts. Moreover, an artificial neural network model was used to estimate outlet air temperature from the solar collectors based on air flow, solar radiation, and outside air temperature Daha fazlası Daha az

Gunduz, G. | Niemz, P. | Aydemir, D.

Article | 2008 | DRYING TECHNOLOGY26 ( 9 ) , pp.1135 - 1139

The goal of this study was to determine the changes in specific gravity and equilibrium moisture content of fir (Abies nordmanniana subsp. bornmulleriana Mattf.) wood after heat treatment at different temperatures and durations. In this study, the effects of three different temperatures and three different durations were investigated. The temperatures were 170, 190, and 210C, and the durations were 4, 8, and 12h. The equilibrium moisture contents of the heat-treated specimens were determined at 20C at relative humidities of 35, 50, 65, 80, and 90%, and the results were compared with control specimens. The results indicated that incr . . .easing temperatures increased the weight loss of the specimens. With respect to dimensional stabilization, the heat-treated specimens had lower equilibrium moisture contents than did the control specimens Daha fazlası Daha az