Chemical refrigerants

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  • "Under the right conditions and applications, evaporative air-conditioning (EAC) technologies can provide excellent cooling and ventilation with minimal energy consumption." Evaporative air-conditioning technologies are being used increasingly in residential and commercial applications worldwide. EAC technologies, which rely on water as a coolant rather than on chemical refrigerants, are economical to produce and use and have important environmental benefits.

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  • Automatic sampler (optional)—The sampler must incorporate glass sample containers for the collection of a minimum of 250 mL of sample. Sample containers must be kept refrigerated at 4°C and protected from light during compositing. If the sampler uses a peristaltic pump, a minimum length of compressible silicone rubber tubing may be used. Before use, however, the compressible tubing should be thoroughly rinsed with methanol, followed by repeated rinsings with distilled water to minimize the potential for contamination of the sample.

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  • Trigeneration. The combination of gas engines with absorption chillers is an optimal solution for generating air conditioning and/or refrigeration. The waste heat from the mixture intercooler, the engin oil, the engine cooling water, and the exhaust gas serves as drive energy for the chillers. Combining a cogeneration plant unit with an absorption refrigeration system allows utilization of seasonal excess heat for cooling.

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  • Automatic sampler (optional)—The sampler must incorporate glass sample containers for the collection of a minimum of 250 mL of sample. Sample containers must be kept refrigerated at 4°C and protected from light during compositing. If the sampler uses a peristaltic pump, a minimum length of compressible silicone rubber tubing may be used. Before use, however, the compressible tubing should be thoroughly rinsed with methanol, followed by repeated rinsings with distilled water to minimize the potential for contamination of the sample.

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  • Each test was conducted using 3 replications. It was necessary to conduct additional experimentation when analyzing for alcohol-toluene extractive content and holocellulose content. The alcohol-toluene test is the starting material for many of the other experiments. Both the lignin and holocellulose content test are performed with extractive-free bamboo that is derived from the alcohol-toluene extractive test. Additionally, holocellulose is a necessary preparatory stage in order to determine the alpha-cellulose content.

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  • Introduction: Chloroform exerts a suppressing effect on the central nervous system. It had been used as a general anaesthetic since the 19th century, but it disappeared, because of its hepatotoxicity and arrhythmia-inducing effects. It is now being used for industrial purposes, such as a solvent, extracting reagent, refrigerant and chemical material. Chloroform poisoning can be seen in accidental, suicidal [1] and homicidal cases.

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  • A great deal has transpired since the final reprint of the previous edition of Fundamentals of Vacuum Technology appeared in 1987. LEYBOLD has in the meantime introduced a number of new developments in the field. These include the dry-running ALL×ex chemicals pump, the COOLVAC-FIRST cryopump systems with quick regeneration feature, turbomolecular pumps with magnetic bearings, the A-Series vacuum gauges, the TRANSPECTOR and XPR mass spectrometer transmitters, leak detectors in the UL series, and the ECOTEC 500 leak detector for refrigerants and many other gases.

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