The development of dried water chestnuts is aimed to study the appropriate concentration of calcium chloride for preparation of water chestnuts before drying process; a proper duration for drying process by using hot air oven; the comparison of drying processes between solar dried-oven and hot air oven; and the use of dried water chestnuts for Thai dessert products. The research result can be summarized that the concentration of calcium chloride solution is 0.25% that yield the best quality for water chestnuts which had 0.63 water activity (aw); 3.47 moisture content color value of (L*) 62.38 (a*) 4.82 (b*) 35.66; and 0.79 specific density. It also yields the best quality to rehydrate water chestnuts comparing to their previous condition. A proper drying duration of water chestnuts soaking in 0.25% calcium chloride by using solar dried-oven at different duration of drying. Dried water chestnuts dried at 9 hours and average dehydration temperature 50-55 Celsius had 0.31 water activity (aw); and color value of dried water chestnuts is of bright red with (L*) 80.14. Also the brightness of rehydrated water chestnuts decreased to (L*) 58.30 and firmness (Newton) to 68.70. By using hot air oven the study of a proper duration of soaking water chestnuts in 0.25% calcium chloride indicated that drying for 3.5 hours of drying time water chestnuts had highest moisture content while drying for 4.5 hours had the least moisture content. Therefore decreasing of moisture content depends on the drying duration with different methods. The study also found that dried water chestnuts using solar dried-oven had less water activity (aw) and moisture content than those using hot air oven. Moreover dried water chestnuts from solar dried-oven had brightness value (L*) less than those from hot air oven; but dried water chestnuts from solar dried-oven had more reddish yellow than those from hot air oven. Also there is similarity of specific density of water chestnuts from both drying methods. For rehydration of water chestnuts color values of these 2 methods are similar. However color which is similar to fresh water chestnuts is resulted by drying water chestnuts with hot air oven; and the brightness (L*) of water chestnuts texture increases. Also value of (a*) and (b*) of water chestnuts from hot air oven are more reddish yellow. Meanwhile firmness (Newton) from drying with hot air oven is able to maintain strength or firmness of water chestnuts. Percentages of water chestnuts absorption are similar between two drying methods. The sensory test of Thai pudding using dried water chestnuts indicated that there is no statistically significant at 95% level of average scores in the terms of color smell taste dried texture and overall acceptance. The result of microbial analysis from dried water chestnuts found that there is no microorganism. In addition the result of raw material cost calculation showed that drying 1 kilogram of fresh water chestnuts yielded 108 grams of dried water chestnuts. The total cost of production is 48.43 Baht per kilogram.

The research has developed the recipes and methods of producing chili curry green curry coconut milk red curry (Southern) and sour curry. The curry paste mixed with shrimp paste to make it convenient and to use. Learn how to mold chili curry the use of stainless steel blocks in forming the most convenient. Drying temperature of 65°C 2-stage and 11-hour drying time. The quality and physical chemical microbiological and sensory characteristics of chilli curry also passed the standard of community products. The design of packaging for cube green curry cube coconut milk curry (southern) and cube sour curry paste were the most accepted among Khuan Prai community members. To use the recipes for commercial distribution continues. A study of consumer acceptance of cube chili curry products. It was found that 150 general consumers accepted 100% Shelf life of 5 months was from April to August 2018. It was found that cube curry had a number of yeasts. Exceeded the standard in 5 months Red Curry (Southern) and Red Curry are also standard products. The research was conducted on September 1-2 2018 at Khuan Prai community enterprise Phunphin Surat Thani. 25 people can make cube chili curry products. It will also scale up the product to the community for distribution

Sweet tamarind is a unique and economic plant of Phetchaboon province and it has already been geographical indication (GI) registered. One of its main problems is fungal degeneration which cannot be physically visible. This causes the consumer’s uncertainty on its quality especially sweet tamarind from small communities. This led to the study on the use of household heat to reduce fungal degeneration by steaming at 100oC for 50 60 70 and 80 minutes and drying in the hot air oven at 70oC for 3 hours. It was found that increasing the heat resulted in darkening the sweet tamarind color and heightening up its content moisture (p<0.05) statistical significance. Drying temperature at 60 70 and 80oC revealed the higher the heat the shorter the drying time and the sweet tamarind content was darker. In addition drying significantly decreased the moisture and preference score of sweet tamarind (p<0.05). The storage of sweet tamarind in mesh bag at ambient temperature revealed that the increase of the storage time resulted in a significant increase in the moisture of the sweet tamarind shell (p<0.05) and could preserve the tamarind for at least 12 weeks without the deterioration from the fungus.

The preparation of dye powder from natural dyes is to study the preparation methods of dye powder and comparison of color fastness. The natural dyes were used in this study containing of Lac Ebony heart wood Sappan heart wood and Turmeric. were selected in this work to prepare dye powder drying salt adsorption and salt precipitation methods were selected in this work. And dye powder was dyed on silk fabric. The result showed that the dye powder from drying and salt precipitation methods showed higher K/S than salt adsorption method. The dye powder of turmeric from drying method showed highest K/S. The dye powders of Lac Ebony heart wood Sappan heart wood from salt precipitation method showed highest K/S. And the washing fastness showed that the preparation methods were not significant. The dye powder of Lac Ebony heart wood Sappan heart wood showed good light fastness and the dye powder from Turmeric showed poor light fastness.

This research’s objectives were to develop an energy saving rotary dryer for paddy using hot air recovery system and to evaluate the energy using. Rotary dryer divided rotating cylinder made of 304 stainless steel 2 mm of thickness 39 cm and 200 cm of diameter and length. The inverter was used to control speed of gear motor of 0.5 HP and rotating speeds of 1-3 rpm. The inside of cylinder composed screw and capture flights. The cyclone system was used to dust separating from the system. The moisture trap contained silica gel the outlet hot air was reduced moisture and recovered using. The fiber glass insulator was applied for reducing energy loss. The heating box composed 3 set of 1600 W heaters and blower motor power was 0.5 HP. In the experiment the drying temperature was varied of 50 60 70 and 80oC and cylinder speed was varied of 1 2 and 3rpm (15.66 10.66 and 5.66min of drying time). The initial moisture content of 10 kg paddy was 29.7?0.6 %wb. The result show that the optimum conditions drying temperature and cylinder speed were 70-80oC and 1 rpm (15.66 min) and final moisture content was 9.2-11.8 %wb. From the save energy testing found that the reducing of SEC was 0.4-0.6 MJ/kg water per drying cycle. There for this developed dryer can save energy using