The experiment set-up with powder fuels (Ni + 10%(in weight)LiAlH4) is 20 grams filled in a nickel cell，located in the stainless-steel reaction chamber. The existing heater is made of nichrome wire, which is wound on a ceramic tube. A stabilized DC power supply is used. The heater is surrounded by MgO thermal insulation material, which is filled in an aluminum hollow cylindrical jacket with inner-diameter of 55 mm, outer-diameter of 25 cm and 40 cm long. The temperature is measured by stainless steel shielded K-type thermocouples. The thermocouple T1 is located on the outer surface of the stainless-steel reaction chamber, T2 is placed in contact with outer surface of the nickel cell and T3 is inserted inside container in contact with the fuel powders. The experiment was carried out in 4-8 May.
The experiment was carried out in 4-8 May, 2015, lasted 96 hours. In the first day, the reaction chamber was vacuumed to 10-4 mbar, and then was heated up. The LiAlH4 was degassed, and the upper pressure in the chamber reached 400 kPa at temperatures of 150-300 0C or so. Then the pressure went down to -90 kPa in subsequent 18-hours. In the next day, when the temperature of thermocouple T3 was increased to about 950 0C by tuning electric power to 900 W, the temperature of thermocouple in the fuel cell increased rapidly. Unfortunately, T3 was damaged at this time. However, T2 still was working well (it is justified by the later exponentially cooling curve), and T2 (the temperature near fuel cell) was also increased to be higher than T1(the temperature near heater) rapidly. When T2 temperature reached a temperature over 1300 0C for 10 minutes, the power was turned off for protecting T2 from damage. The self-sustaining heat effect appeared and lasted about 20 minutes, then the T2 temperature went down rapidly. When the temperature decreased less than 1000 0C, the power was turned on to 900 Watts, and an excited state of the anomalous heat production appeared again because T2 was back to be higher than the T1 again. In the most of running time, T2 temperature was kept less than 1200 0C by controlling the electrical power. A typical result of temperature variation of T2 and T1 versus input power on 8 May is shown
The anomalous heat production in the Ni+LiAlH4 observed repeatedly. The heat production can be controlled by input power and can last for a long time. The T2 temperature placed on the outer surface of the fuel cell is about 405 0C greater than the T1 temperature, T1 is placed on the outer surface of the reaction chamber and near the heater. An estimate power of excess heat is about 600 W. The ratio of excess heat of 600 W to input power of 780 W is 0.77. Considering self-sustaining effect, the input power might be significantly decreased if a chopper supply can be used to keep excess heat production. How to calculate the ratio of total produced heat energy to electrical input energy remains a question in present work. The consumption of nickel container and Ni + LiAl4 calculated energy density is 4 orders of magnitude greater than the value of gasoline. Therefore, the origin of excess heat cannot be explained by any chemical energy. The isotope abundances of nickel and lithium in the fuels after experiment will be analyzed by mass spectrometry technique. A further experiment will be carried out. The powders is checked to be less than 1 g after experiment.
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