Fault detection and diagnostic tools. (General Developments).NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. has developed two fault detection and diagnostic tools to assist operators in monitoring the performance of Heating, Ventilating ventilating Natural or mechanically induced movement of fresh air into or through an enclosed space. The hazards of poor ventilation were not clearly understood until the early 20th century. Expired air may be laden with odors, heat, gases, or dust. , and Air Conditioning air conditioning, mechanical process for controlling the humidity, temperature, cleanliness, and circulation of air in buildings and rooms. Indoor air is conditioned and regulated to maintain the temperature-humidity ratio that is most comfortable and healthful. systems: Air Handling Unit Performance Assessment Rules (APAR) and Variable Air Volume (VAV) Box Performance Assessment Control Charts (VPACC). APAR uses a set of expert rules to detect common mechanical faults or control problems in air-handling units. VPACC uses statistical quality control measures to detect faults or control problems in VAV boxes. Both tools were tested using the NIST Virtual Cybernetic cy·ber·net·ics n. (used with a sing. verb) The theoretical study of communication and control processes in biological, mechanical, and electronic systems, especially the comparison of these processes in biological and artificial systems. Building Testbed, now equipped with fault models, and found to be successful at detecting and diagnosing a wide variety of faults. Both tools appear to be suitable for embedding in commercial control products. CONTACT: Natascha Castro, (301) 975-6420; natascha.castro@nist.gov. |
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