The branch of science called thermodynamics deals with systems that are able to transfer thermal energy into at least one other form of energy (mechanical, electrical, etc.) or into work. The laws of thermodynamics were developed over the years as some of the most fundamental rules which are followed when a thermodynamic system goes through some sort of energy change.
HISTORY OF THERMODYNAMICS
The history of thermodynamics begins with Otto von Guericke who, in 1650, built the world's first vacuum pump and demonstrated a vacuum using his Magdeburg hemispheres.
Guericke was driven to make a vacuum to disprove Aristotle's long-held supposition that 'nature abhors a vacuum'. Shortly after Guericke, the English physicist and chemist Robert Boyle had learned of Guericke's designs and, in 1656, in coordination with English scientist Robert Hooke, built an air pump. Using this pump, Boyle and Hooke noticed a correlation between pressure, temperature and volume. In time, Boyle's Law was formulated, which states that pressure and volume are inversely proportional.
CONSEQUENCES OF THE LAWS OF THERMODYNAMICS
The laws of thermodynamics tend to be fairly easy to state and understand ... so much so that it's easy to underestimate the impact they have. Among other things, they put constraints on how energy can be used in the universe. It would be very hard to over-emphasize how significant this concept is. The consequences of the laws of thermodynamics touch on almost every aspect of scientific inquiry in some way.
A publication of The Italian Association of Chemical Engineering Online at www.aidic.it/cet
The evolution of fires in confined space such as chemical and pharmaceutical warehouses is characterized by the complex interaction between the combustion process, the enclosure and occupants, which has to be managed when coping with fire emergency and, more in general, for fire safety. This paper proposes a quick, decision-making tool based on adversity scenarios and more specifically through the definition of four main elements: i) the potential fire spread categories, which describe the potential paths and extents of fire propagation; ii) the thermal load expressed as hot gas layer temperature; iii) the available safe egress time (ASET) for people to leave the enclosure, which is essential for organizing people evacuation; and iv) other specific hazards. The proposed tool can be usefully adopted to improve the level of information to interested stakeholders (building owner, fire service, etc.) concerning both the fire hazard and the building fire performance. 1. Introduction Fires constitute one of the most important hazards from chemical and pharmaceutical warehouses. They can give rise to serious damage to people as well as to the environment and they can cause extensive economical losses. For these reasons, in order to assist the management to identify the most suitable countermeasures (both organizational and technical), it is useful to have a tool that allows identifying in advance the potential adverse situations that could characterize the analysed system. In the present work, two indicators describe the potential fire-induced adverse situations, the first is a qualitative description of the potential fire, and the second is a quantitative evaluation of the thermal load on sensible targets, based on Hot Gas Layer Temperature (HGLT). The assessment process is based on the inspection of the workplace (Dusso et al., 2015): the workplace is divided into cells, i.e. single rooms or enclosures, or in more in general, subsections of the same workplace separated from those adjacent by physical elements as walls or floors and - in the open - barriers or separation distances. Then, important information regarding the characteristics of the stored materials, the storage conditions and the features of the enclosure such as floor area, ceiling height, openings should be collected.
Successful Litigation Relies on Proper Analysis
by Roman Kickirillo, P.E., CFEI, CVFI, Donan Engineering Company, Inc. Nashville, Tennessee
The investigation into the cause and origin of motor vehicle fires should be considered a separate field of study than structure fires. Although the basic Fire Science remains the same, there are important differences in the interpretation and analysis of fire patterns and other evidence. An understanding of these differences before litigation begins can avoid lost time and expenses later in the process. There are very few absolute rules in vehicle fire investigations, but one always holds true: If your expert’s analysis is incorrect, the opposing side will be more than happy to let you know about it - at the worst possible time.
Study by: Albert Simeoni, Zachary C. Owens, Erik W. Christiansen, Abid KemalExponent, Inc. USAMichael Gallagher, Kenneth L. Clark, Nicholas SkowronskiNorthern Research Station, USDA Forest Service, USAEric V. Mueller, Jan C. Thomas, Simon Santamaria, Rory M. HaddenSchool of Engineering, University of Edinburgh, UK
Two experimental fires, with contrasting intensities, were conducted in March 2016, in the Pinelands National Reserve (PNR) of New Jersey, United States in order to provide a preliminary assessment of the reliability of the fire direction indicators used in wildland fire investigation. The experiments were part of a larger project intended to measure firebrand production in a forested ecosystem. As part of this project, fire behavior, as well as the environmental and fuel conditions were also measured. Two burn parcels, covering an area of approximately 30 hectares each, were ignited from unimproved forest roads which delimited them. The forest canopy was comprised primarily of pitch pine with intermittent oaks. The understory contained a mixed shrub layer of huckleberry, blueberry, and scrub oaks. In order to explore a wide range of indicators, objects such as bottles, cans and small fence elements were planted in the burn area, and photographed before and after the fire. To obtain an accurate measure of pre- and post-fire fuel properties, fuel load, fuel bulk density, and fuel moisture content were also measured. In addition, environmental data (wind velocity and direction, air temperature and humidity) were recorded. The fire behavior can be reconstructed using measurements of fire rate of spread, fire front temperatures, fire front geometry, and heat fluxes. Video and infrared cameras were used to document the general fire behavior in selected locations. This paper represents the first step in the analysis of the fire indicators and focuses on the more intense of the two burns and on the appearance of the macro- and microscale fire pattern indicators. A majority of the indicators were assessed, although the configuration of the burn parcels, the ignition technique, and precipitation immediately following the fires limited a full study. The results show that some fire direction indicators are highly dependent on local fire conditions and fire behavior and may be in contradiction with the general spread of the fire. Overall, this study demonstrates that fire pattern indicators are a useful tool but must be interpreted in the frame of a general analysis of the fire, combined with a good understanding of fire behavior and fire dynamics.
From Out of the Abyss...
This week’s article from the past is titled Incendiary Fires Can Be Spotted and was written by Benjamin Horton, CPCU, who was President of the National Adjuster Traing School in Louisville, Kentucky.. It is taken from the Decembe 1968 Vol. XVI No.5 issue.
Incendiary Fires Can Be Spotted
Candles can enhance décor or be a source of light. However, they can also start fires. National estimates of reported fires derived from the U.S. Fire Administration’s National Fire Incident Reporting System (NFIRS) and NFPA’s annual fire department experience survey show that candles were the heat source in an estimated average of 9,300 reported home fires annually during 2009-2013. These fires caused an average of 86 civilian deaths, 827 civilian injuries and $374 million in direct property damage per year. More than one-third (36%) of home candle fires started in the bedroom. Almost three of every five (58%) fires occurred because the candle was too close to something that could burn. Candle fires are most common around the winter holidays. Candles used for light in the absence of electrical power appear to pose a particular risk of fatal fire. Home candle fires climbed through the 1990s but have fallen since the 2001 peak. ASTM F15.45 has developed a number of standards relating to candle fire safety. Despite the considerable progress made in reducing candle fires, they are still a problem. In 2009-2013, candle fires ranked second among the major causes in injuries per thousand fires and average loss per fire. Efforts to prevent these fires must continue.
This recall involves indoor 2-light fluorescent light fixtures that range in size from 18 inches to 4 feet long. The fixtures were sold in white and can be mounted from heights between 8 and 12 feet. A date code between 182 11 (July 1, 2011) and 090 15 (March 31, 2015) is affixed to the fixture near the ballast in a DDD YY format. Catalogue and model numbers are located on the second line of a label affixed to the inside of the fixture. Catalogue and model numbers included in the recall: DLE217RLP, DLE217RLPB, DLE 232RLP, DLE232RLPB, SL232R, SL232R/1, SL232RPC, SL232RTP, SLNR232R, SLNR232R/1, SLNR232RCHR, SLW232R, SLW232R/1, SNF115R, SNF117R, SNF125R, SNF217R, SSF217R, WP217R, WP217RNKLLU, WP232R, WP232RLU, WP232RNKL, WP232RNKLLU and WP232RNKLRL.
Click here for full details from CPSC.
Almost every consulting engineer works with codes and standards on a daily basis, but do you know the difference between a code and a standard?
According to the National Institute of Standards and Technology (NIST) Circular No. A-119, Revised, a standard is "[t]he definition of terms; classification of components; delineation of procedures; specification of dimensions, materials, performance, designs, or operations; measurement of quality and quantity in describing materials, processes, products, systems, services, or practices; test methods and sampling procedures; or descriptions of fit and measurements of size or strength." In plain English, a standard consists of technical definitions, procedures, and/or guidelines that specify minimum requirements or instructions for manufacturers, installers, and users of equipment. This can be done by specifying either the methods or the results; the latter is known as "performance specifying." Most importantly, a standard provides standardization or agreement within the industry, which translates to a common reference among engineers, manufacturers, and bidders.
Since the 1989 Montreal Protocol and its successor agreements, the world of refrigerants has been marked by change. In the search for more environmentally-preferable refrigerants, technology has moved from chlorofluorocarbons to a host of alternative substances. Many of these substances are serving as interim measures, until the phase-out of ozone-depleting and global-warming refrigerants meets the targets set by the U.S. Clean Air Act. The journey toward compliance has caused the HVAC equipment and appliance industries to revisit the potential use of substances that have good environmental and thermodynamic properties as refrigerants, but which are also, unfortunately, flammable.
This recall involves Cree LED T8 lamps used indoors to replace traditional two pin T8 fluorescent tubes. The white lamps have a cylindrical shape and measure 48 inches long. The affected units are marked as “BT848 Series Lamp” with the product part number on the lamp itself or printed on a white label affixed to the lamp. A four digit date code is printed on the lamp under a statement that reads “Compatible with Instant Start, Rapid Start and Dimmable Electronic Ballasts.”
Read the details at CPSC
IAAI President Peter Mansi welcomed everyone to the International Association of Arson Investigators 66th International Training Conference in Chicago, Illinois this past week, May 18th – 22nd. Around 600 attendees were on hand for a great schedule of classes during the week. Approximately 40 of those attendees were from Central America countries requiring translation throughout the week. CCAI Director Robert Rullan gave a presentation on “CSI” as part of the training as well as assisting with the translation needs of the students.
On opening day, CCAI’s 1st VP, Dale Feb, taught a four-hour class titled “Hearth Products Ignition Source or First Fuel Ignited”. CCAI Member Steve Carmen taught two two-hour classes; “Math for Fire Investigators” and “Elevated Fire Origin Research”. CCAI Member John DeHaan joined up with Instructors Chris Connealy and Kelly Kistner in presenting “Arson Convictions: Reviewing the Science – The Texas Experience”. Jamie and Cameron Novak were on hand to set things on fire in "Burn to Learn". Rounding out the week was Mike Bryant teaching "Investigative Interviewing for Fire Investigations. Many other instructors joined in the training and in all, four separate tracks of education were presented throughout the weeklong conference.
CCAI President Eric Emmanuel represented the CCAI Chapter at the “Presidents Reception” on Sunday night, again during “Opening Ceremonies” on Monday Morning, at the “Chapters Presidents Luncheon” on Tuesday, during the IAAI “Annual General Meeting” on Tuesday afternoon and at the “Awards and Installation Banquet” on Tuesday night. He was seen throughout the week engaging different individuals in conversations and promoting CCAI.
IAAI hosted a Vendor Room where approximately 30 different companies set up display booths and provided valuable information to the attendees. A very active Spousal Program visited some of the many sights and attractions that Chicago has to offer. Monday was spent at the Local Boutiques and Hummel Museum. On Tuesday, the highlight of the week, they visited the Chicago Fire Academy and Fire Museum. Wednesday and Thursday were spent exploring many of the hot spots around the “Windy City” including the Navy Pier, Sky Deck Chicago, Millennium Park and the Cloud Gate Sculpture, Art Institute Museum, Field Museum of Natural History, Museum of Contemporary Art, Shedd Aquarium and Adler Planetarium. The week included lunches at the Hard Rock Café, Rainforest Café, and many of Chicago’s authentic hot dog and pizza restaurants. Before departure on Friday, the group held a farewell breakfast at the hotel. Approximately 28 people participated in the Spousal Program.
During the IAAI “Annual General Meeting”, elections were held. Dan Heenan (Nevada) was sworn in as President, George Codding (Colorado) was sworn in as 1st VP and Scott Bennett (Ohio) was elected as 2nd VP. Darrell Sanders (Louisiana), William T. Moreland (Florida) and Kevin Crawford (Colorado), Chris Van Vleet (Kansas) were elected to the serve three-year terms on the IAAI Board of Directors. Joe Sesniak (Arizona) was elected to serve a three-year term on the IAAI Foundation Board of Directors, and David Snead (Texas) was reelected as president of the Foundation. Immediately following the election, nominations were opened for 2016. CCAI Board Member Robert Rullan was nominated to run for a Director Position next year.
CCAI members Troy Morrison, Jim Allen, Kathryn Varner, Don Perkins, Dennis Fields, Bill Kilpatrick and his wife Debbie, Tom Fee and others made a great showing for California Chapter 22.
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