TY - JOUR T1 - Experimental Study of a New Technique to Reduce Absorber Heat Losses: Applied for Drying Painted Gas Cylinders AU - Slimani, Driss AU - Perilhon, Christelle AU - Elkihel, Bachir JO - Journal of Engineering and Applied Sciences VL - 14 IS - 16 SP - 5725 EP - 5732 PY - 2019 DA - 2001/08/19 SN - 1816-949x DO - jeasci.2019.5725.5732 UR - https://makhillpublications.co/view-article.php?doi=jeasci.2019.5725.5732 KW - solar dryer KW -Combined solar concentrators KW -two naturel heat transfer fluids KW -thermal losses KW -obstacles KW -tilting concentrators AB - In this experimental study, a solar dryer has been designed and manufactured by combining a concave solar concentrator with a series of convergent lenses whose concentrated radiation are reflected to the same absorber. Our main goal for this technique is to reduce the absorber thermal losses without the need to provide expensive and fragile thermal insulation. Thus, the idea is to create the greenhouse heating on both sides of the flat absorber. In our dryer, the receiver uses air and water as the heat transfer fluid these two fluids are heated in the absorber and sent a heat exchanger. Furthermore, in order to improve the thermal performance, our approach is based on some techniques such as the combination of two types of solar concentrators, simultaneous use of two natural heat transfer fluids, tilting concentrators, the insertion of obstacles at the absorber and a specific solar tracker for explosive atmosphere. Our dryer has been tested for the first time in gas filling plant in Morocco for drying painted gas bottles. Compared with flat-plate solar collector, the proposed dryer has improved the drying temperature from 40-85°C. In fact, our solar dryer has reduced the drying time from 420 to just 40 sec. Also, the health risks of workers have been reduced and the number of painted bottles has been increased by more than 43%. ER -