An experimental study was conducted on three models of solar collectors having an absorber made of concrete designed and built in the TPL （Thermal Process Laboratory）. A sequence of tests was performed on these mode...An experimental study was conducted on three models of solar collectors having an absorber made of concrete designed and built in the TPL （Thermal Process Laboratory）. A sequence of tests was performed on these models for the two air circulation models （forced and natural） in order to compare their thermal performance. The results are presented in terms of useful energy, stored energy and thermal efficiency of each model.展开更多
Biodiesel(BD)was made from animal-fats reacting with methanol and potassium hydroxide in the laboratory.The biodiesel made in the laboratory was sent to K-petro,the government agency to inspect the quality of animal-f...Biodiesel(BD)was made from animal-fats reacting with methanol and potassium hydroxide in the laboratory.The biodiesel made in the laboratory was sent to K-petro,the government agency to inspect the quality of animal-fats biodiesel,of which generally the quality was acceptable for heating oil for agricultural hot air heater.Kinematic viscosity and calorific values of the biodiesels were measured.BD20(K),kerosene based biodiesel,showed 18 cSt at-20~C.It seems that BD100 can not be suitable for heating fuel under some temperature.As BD content increased calorific value decreased up to 40,000 J/g for 100%BD(BD100)while,light oil calorific value was 45,567 J/g,showing difference of 5,567 J/g(about 12%difference),Several different fuels including BD20(biodiesel 20%+light oil 80%),BD50(biodiesel 50%+light oil 50%),BD100(biodiesel 100%)and light oil were prepared and tested for fuel combustion qualities for agricultural hot air heater and their combustion performances were compared and analyzed.Flame dimensions of biodiesels and light oil were almost same shape at the same combustion condition in the burner of the hot air heater.Generally,CO2 amounts of BDs were greater than light oil,but the differences were so small that it is hard to tell there was significant difference between the BDs combustion and light oil.展开更多
文摘An experimental study was conducted on three models of solar collectors having an absorber made of concrete designed and built in the TPL （Thermal Process Laboratory）. A sequence of tests was performed on these models for the two air circulation models （forced and natural） in order to compare their thermal performance. The results are presented in terms of useful energy, stored energy and thermal efficiency of each model.
文摘Biodiesel(BD)was made from animal-fats reacting with methanol and potassium hydroxide in the laboratory.The biodiesel made in the laboratory was sent to K-petro,the government agency to inspect the quality of animal-fats biodiesel,of which generally the quality was acceptable for heating oil for agricultural hot air heater.Kinematic viscosity and calorific values of the biodiesels were measured.BD20(K),kerosene based biodiesel,showed 18 cSt at-20~C.It seems that BD100 can not be suitable for heating fuel under some temperature.As BD content increased calorific value decreased up to 40,000 J/g for 100%BD(BD100)while,light oil calorific value was 45,567 J/g,showing difference of 5,567 J/g(about 12%difference),Several different fuels including BD20(biodiesel 20%+light oil 80%),BD50(biodiesel 50%+light oil 50%),BD100(biodiesel 100%)and light oil were prepared and tested for fuel combustion qualities for agricultural hot air heater and their combustion performances were compared and analyzed.Flame dimensions of biodiesels and light oil were almost same shape at the same combustion condition in the burner of the hot air heater.Generally,CO2 amounts of BDs were greater than light oil,but the differences were so small that it is hard to tell there was significant difference between the BDs combustion and light oil.
