The sensitivity analysis in efficiency of solar water heater system self-circulated by a stream power was performed in this study. The mathematical model of the system was developed based on the experimental results to predict the available amount of water pumped temperature and pressure in main devices. This system was operated by using a simple flat plate solar collector with an exposed area of 1.58 m2 and a storage tank of 30 liters. The results of systematic performance which performed by math model was compared to the experimental results. It was found that the values of were 5.876% 3.583% and 1.361% for vapor pressure and temperature in the flat plate solar collector and temperature in the storage tank respectively. The system was workable when the solar energy input values were equal to or greater than 584 W/m2 607 W/m2 632 W/m2 and 662 W/m2 for discharge head 1 m 1.5 m 2 m and 2.5 m respectively. From system simulation the system could have the daily average thermal efficiency was between 2.94 – 11.47% and the daily average pump efficiency 0.00057 – 0.0026% depending on the intensity of incident solar radiation and the discharge head of the system.

This purpose of the research was to study of Solar Absorber Shape Effect in the Solar Air Heater. These has designed and constructed the solar air heater for drying agricultural products of two different types. Comparison of First thing used square type one glass layer used centrifugal fans to feed air and installed solar absorber which each made of sinusoidal corrugate galvanized steel sheet coated with dull black paint and each other made of trapezoidal corrugate galvanized steel sheet coated with dull black paint. The results of research showed that the solar absorber which each made of trapezoidal corrugate galvanized steel sheet coated with dull black paint is most suitable. Which has overall thermal efficiency 66% and can generate maximum temperature 96.13 degree of Celsius

This research was to study the feasibility of CIGS for condominiums in Thailand by studying the energy consumption of building which divide by behavior of users which interested in day time users and night time users. Then study approach and feasibility to apply CIGS for condominiums by consider energy consumption and economic efficiency of installation CIGS for energy conservation. The result showed that when installed 110 watts/m2 of CIGSs on windows in a room type can be provide electricity 2.51 kWh per day 2.81 kWh per day and 3.75 kWh per day which can be represented 40 percent of the total energy consumption. In other word can be reduce energy supply from grid per month 75.30 kWh 84.3 kWh and 112.50 kWh. While investment cost per square meter of CIGS is about 23000 - 35000 baht which equivalent to 3 percent of total condominium price that mean payback period is about 8 years. Although CIGS is not able to provide all of electric consumption in building but from the assessment of economics found that there is a very interesting to investment it should be interested policy for the government to enforce condominium to install CIGS for sustainable development.

This research was aimed to investigate for pineapple leaf paper drying. In this study process of drying the paper as a final step after the other. Paper drying time takes in solar energy to dry naturally for at least 2-3 days or more without natural sunshine. Solar hybrid energy dryer was designed for drying faster than traditional drying. The development of solar hybrid energy dryer ability to operate continuously. The solar dryer receives the heat from sunshine by passing into the solar panel dimension 1 x 2.6 m2 . The panel was installed on the top of the oven which declined 15 degree from the ground. The dimension of the oven is 1 x 1.05 x 1.30 m3 and have added heat to paraphrase another 2 rooms and heater 4 kW with controller and have added heat to paraphrase another 2 rooms. The dryer installed heater 4 kW with temperature controller and blower 0.22 kW serves as the circulation of heat in the oven to constant flow of 0.138 m3 / s. Experiment research test 3 types ; the use of solar energy alone the use of solar heater with a temperature of 50 55 and 60 °C and the heater only at 50 55 and 60 °C with three temperature settings. The variables in the study such as temperature humidity in the dryer humidity and Solar energy affect the pineapple leaf paper drying time. Experimental results from solar heater hybrid with 60 °C temperature setting was dried in minimum period of 3 hours and half at an average initial moisture content 1043.70% db to the final moisture content of 9.12% db. Highest average temperature in the dryer was 64.33 °C with electrical energy consumption 10.5 kWh. The use of only solar drying was dried in maximum period of 5 hours at an average initial moisture content 1070.98% db to the final moisture content of 15.84% db. Highest average temperature in the dryer was 39.89 °C with minimum electrical energy consumption 10.5 kWh.

Current energy from sun made a significant contribution in the electricity manufacturing industry in Thailand. However the potential application of solar energy are at the low level. The agency will need to make solar energy perpendicular to the sun as much as possible. Therefore the invention of the light experimental set for two-axis motion to identify the vertical axis was done to compare the value of Light Dependent Resistor to locate the origin of the light and can be applied to the real work in the future.