Furnace humidifiers

Other household environmental problems are presented by the piano keyboard (Fig. 12-2) and the furnace humidifier (Fig. 12-3). Piano keys must be resistant to household chemicals, cleaners, foods, and perspiration. Organs played in night clubs often have melamine keys for improved cigarette resistance. Piano sharps require a scratch resistant material since the player may strike the keys with his fingernails organ sharps can be thermoplastic because the player rolls over the keys. Styrene acrylonitrile (SAN) is commonly used for natural keys and for telephone handsets that encounter the same problems. Bottle caps often crack (Fig. 12-4) when fastened extra tight and craze from exposure to environmental products, conditions, and lost liners. Products designed for laboratory or other use must be tested for their resistance to environmental chemicals as illustrated in Fig. 12-5. 

The furnace was preheated and the atmosphere conditioned by passing Ar (up to 300 mL/h) humidified with superheated steam for one hour prior to starting the test. The Ar was humidified by injecting water from a syringe pump into the Ar line, which was heated with an internal Kal-rod heater and is referred to as the superheated steam line (SHS). The temperature of the humidified Ar at the exit of the SHS was monitored with a thermocouple and was varied via a variac. 

Conner M, Lam H, Rogers A, et al. 1985. Lung injury in guinea pigs caused by multiple exposures to submicron zinc oxide mixed with sulfur dioxide in a humidified furnace. J Toxicol Environ Health 16 101-114. 

Lam HF, Peisch R, Amdur MO. 1982. Changes in lung volumes and diffusing capacity in guinea pigs exposed to a combination of sulfur dioxide and submicron zinc oxide mixed in a humidified furnace. Toxicol AppI Pharmacol 66 427-433. 

Humidifier- An appliance normally attached to the furnace, or portable unit device designed to increase the humidity within a room or a house by means of the discharge of water vapor. 

The most important reason for corrosion in appliances is the water that is being handled by the equipment. This type of corrosion affects the internal components of appliances and limits life expectancy. In the case of home appliances, the appliances most susceptible to internal corrosion are refrigerators, water heaters, washers, dishwashers, and water softeners. The air conditioners, humidifiers, high-efficiency furnaces, dehumidifiers, and boilers are susceptible to internal corrosion. 

Fig. 12-3. The cabinet, access door, motor assembly and drum assembly of Lennox s central humidifier is molded from polyphenylene oxide (PPO) to solve corrosion problems that exist with metal components when exposed to the various water conditions across the country. The grade selected is rated SE-1 according to U.L. Bulletin 94 on flammability.,This and the material s high heat resistance of 265° F enabled the units to be certified by the Air Conditioning Refrigeration Institute as passing all requirements of their standard 610 which measures capacity and ability to withstand a 200-250°F temperature. (Courtesy Lennox Furnace Co. Mar-shalltown, Iowa)...

The honeycomb and seal samples were assembled and secured on the T-section carrier, as described earlier. Prior to the introduction of samples, furnaces were heated to the appropriate test temperature and the whole system left to equilibrate. Before entering the reaction tube, the test gas was first bubbled through a humidification chamber controlled at 40°C. Heated supply lines connected the humidifier to the reaction tube inlet in order to avoid water condensation. The correct flow rate was established and the specimen assembly slid into the reaction chamber normally, the samples took about 30 min. to reach the test temperature. In a similar manner, after the samples had been exposed for the required period, they were slowly removed from the furnace (again taking about 30 min.) and cooled to room temperature in laboratory air before desiccation and re-weighing. 

Zirconium oxide films have been prepared by an ultrasonic nebulization and pyrolysis technique. A solution (0.02M) of zirconium acetylacetonate in ethanol was nebulized by a commercial ultrasonic humidifier (Holmes Air transducer operates at 1.63 MHz) and was carried into a horizontal reactor by argon (Fig. 1). The reactor was heated by a two-zone mirror furnace (Transtemp Co., Chelsea, MA). 

Figure 1. Ultrasonic humidifier-horizontal reactor setup (1) substrate (2) substrate rotation motor (3) furnace (4) spray nozzle (5) carrier gas (6) solution (7) membrane (8) ultrasonic humidifier.

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