The Age Of Refrigeration Environmental Sciences Essay

The Age Of Refrigeration Environmental Sciences Essay The ozone depletion potential is the ability of gases to degrade ozone if released into the atmosphere, and is compared against the value for CFC-11 (CCl3F), which was chosen to be 1. The halocarbon global warming potential, or greenhouse warming potential of a gas, is a calculation of how strongly the release of a certain quantity of that gas would contribute to global warming, via the greenhouse effect. Once again, it is compared against the value for CFC-11 (CCl3F), which has the value of 1. HFC-134a (1, 1, 1, 2-tetrafluroethane, CF3CH2F), a widely used refrigerant, is more environmentally suitable than many other possible refrigerants. Firstly, its ozone depletion potential (ODP) is completely nonexistent, meaning that the release of HFC-134a into the atmosphere would not damage any more of the ozone layer. This is superior to many other proposed replacements to CFC-11, which often feature greatly lowered ODP, rather than zero ODP. HFC-134a also has a reduced halocarbon global warming potential (HGWP) of 0.25, a quarter of CFC-11s value. HFC-134a is not the lowest in this value, however. Some other possible refrigerants, such as ammonia and iso-butane (C4H10) have incredibly low, almost non-existent HGWP values. However, both of these gases (especially ammonia) can be considered toxic to humans, and both are flammable, leaving them liable to explosion from a spark if they were to leak from a refrigeration unit. Because of this, HFC-134a is therefore a more suitable modern refrigerant for domestic use. (Website 1) Q1ii) CCl2=CHCl, or trichloroethylene, can be converted to HFC-134a (also called R-134a) by carrying out several reactions in sequence. In the first part of the reaction, CCl2=CHCl is reacted with hydrogen fluoride (HF) to produce CCl2F CH2Cl. In the second part of the reaction, the CCl2F CH2Cl is reacted with 2HF to form CF3 CH2Cl, and then with another HF to created the HFC-134a (CF3=CH2F). This whole reaction process is shown in full below In order for HFC-134as usage to become widespread, its conversion from trichloroethene through industrial means needed not only to be feasible, but both cost and time effective as well. Firstly, the reaction process takes place within two separate chambers. One of the chambers is where the reaction products can be separated, allowing the HFC-134a to be isolated from dangerous, or otherwise unwanted products. The other chamber deals with recycling the trichloroethylene (CCl2=CHCl) and hydrogen fluoride (HF) used within the reaction, so they can be reused within subsequent reactions. This helps to make the HFC-134a conversion process more cost effective. A fluorination catalyst is also used in the reaction process, helping to make the conversion more feasible and time efficient. The conversion process also takes place at high temperatures (up to 400oC) and at super-atmospheric pressure to further ensure that it operates both cost and time effectively. (Website 1) Q2i) According to the research published in the article Regulating To Reduce Emissions Of Fluorinated Greenhouse Gases from the Journal of fluorine chemistry, the chemical compounds which contribute the most to global warming are, in order: carbon dioxide (CO2), methane (CH4), Nitrous Oxide (N2O), the ozone depleting substances (CFCs HCFCs), and then the fluorinated greenhouse gases, namely hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and Sulfur hexafluoride (SF6) Carbon dioxide (CO2), the gas most contributive to global warming, is a small atmospheric molecule that is a key component of our atmosphere as it is used in the carbon cycle of plants. Of all of the contributing gases, CO2 has the lowest global warming potential (GWP). However, due to the incredibly high production and release of the gas into the atmosphere, CO2 is still the leading cause of global warming. Methane (CH4) is another simple chemical structure, and is the main component of natural gas. Like CO2 it has a relatively low GWP, but is a major contributing factor to global warming due the large amounts of the gas released into the atmosphere. Nitrous Oxide (N2O) is an oxide of nitrogen, more commonly called laughing gas that is used for both anaesthesia and for its oxidizing effects. N2Os GWP is higher than methane and carbon dioxide, but its level of emissions is also much lower The ozone depleting substances, namely HCFCs CFCs, were incredibly common in the early days of domestic refrigeration, as they were non flammable, non toxic and inexpensive. They were quickly phased out from general use, however, when it was discovered that they had an extremely detrimental impact on the ozone layer. They also contribute to global warming, and though they were largely replaced by the use of other gases such as HCFs, they still contribute significantly to global warming. Hydrofluorocarbons (HFCs) are chemically similar to CFCs, but do not share their ozone destroying effects. As a result of this similarity and due to the inert nature of HFCs (non-flammable non-toxic in almost all cases) they are widely used as replacements for CFCs in a variety of domestic appliances and products. However, HFCs feature considerable global warming potentials (GWPs), making them a key contributor to global warming. Compound Compound Emissions (million tonnes) Global Warming Potential (100 year vs. CO2) GWP emissions (million tonnes CO2e) Percentage contribution to global warming (%) Carbon Dioxide (CO2) 30800.00 1 30800 65.4 Methane (CH4) 350.00 21 7350 15.6 Nitrous Oxide (N2O) 11.00 310 3410 7.2 Ozone Depleting Substances (CFCs HCFCs) 0.60 8100 4860 10.3 Hydrofluorocarbons (HFCs) 0.14 2800 392 0.8 Perfluorocarbons (PFCs) 0.02 6500 130 0.3 Sulfur hexafluoride (SF6) 0.01 23900 143 0.3 Perfluorocarbons (PFCs), hydrocarbon derivatives, are another set of environmentally damaging compounds, especially when they are saturated and within the C1-C6 range. They are useful compounds in the electronics industry, though it is an aim that their usage is kept to the absolute minimum and only when no other compound would perform the desired function in their place. Like HFCs, they have a lower level of emissions, but a high GWP Sulfur hexafluoride (SF6) is a technically diverse gas, useful for a diverse range of applications, but most commonly used as a dielectric gas in situations involving high voltages because of its dielectric strength and constant, its properties for arc (spark gap)-quenching and its suitability for use in transferring heat. Its level of emissions may be the lowest of all contributing gases, but its GWP is by far the highest. (Lindley, 2005) Emission values for these key compounds, and their percentage contributions to global warming, are shown in the table below. Table 1: Greenhouse gas emissions in the year 2000 [Adapted from table 1 (Lindley, 2005)] The relative dangers of certain molecules, in regards to global warming, can also be assessed via radiative forcing. Radiative forcing is the effects of the heat energy produced by solar rays being held within the atmosphere (most crucially between the lowest part of the atmosphere [troposphere] and the stratosphere) of earth, rather than escaping out into space. This effect is made worse by the over abundance of certain gases in this section of the atmosphere. Therefore, measuring the radiative forcing effects of certain gases can, in turn, help work out how much of an effect that molecule is having on global warming. A figure, showing the extent of radiative forcing effects for different gases is shown. Figure 1 (right): estimated radiative forcing effects of key gases from 1990-2015 [Figure 1 from (Lindley, 2005)] It is clear from the results shown that in order for the effects of global warming to be lessened, reduction in the emissions of these key contributing compounds would need to be carried out. Most crucially, the emissions of CO2 would need to be lessened, as it has the highest percentage contribution to global warming, as well as the largest radiative forcing value. The radiative forcing values for ozone depleting substances are also very large, but as these are being phased out and replaced by the fluorinated greenhouse gases (HFCs, PFCs. SF6), they are less of a concern. (Lindley, 2005) Q2ii) F-Gas regulation is a proposal designed to keep the usage of hydrofluorocarbons and perfluorocarbons under stricter control, so that their emission levels do not contribute any more significantly to global warming. This will be achieved through a variety of means, including: improved containment of gases, reduced and restricted gas usage and putting requirements on how these gases are destroyed. In some cases, a ban may even be placed on a certain gas, preventing it from being used for specific functions. Furthermore businesses that use produce or sell f-gases are required to disclose what quantities of F-gas they are using, creating and supplying respectively. In addition to this, those involved with F-gases will be trained on how to safely handle the gases and prevent any unnecessary leaks, and any significant use of F-gases must be labelled as such. These measures all serve the purpose of limiting the amount of fluorinated greenhouse gases that are leaked into the atmosphere, keep ing the percentage contribution of fluorinated greenhouse gases to global warming as low as possible. (Lindley, 2005) In accordance with these regulations, industrial refrigeration systems are now to be inspected on a regular basis. Details on these new procedures is found in the table below Table 2: Inspection schedules for refrigeration units of different capacities [Adapted from table 2 (Lindley, 2005)] Quantity of F-Gas in Refrigeration System Inspection Frequency (With No Leak Detection) Inspection frequency (With Leak Detection) Containing up to 30 kg (excluding airtight systems which contain less than 6kg) Once every 12 months Installation not required Containing up to 300kg Once every 6 months Installation not required (Presence of install halves inspection frequency) Containing more than 300kg Once every 3 months Installation mandatory (Presence of install halves inspection frequency) [Note: In the event of a leak, the system must undergo reinspection 1 month after the leak has been fixed] Also, the F-gas regulation stipulates that certain refrigeration applications must be banned completely. Details on those affected applications are shown in the table below. Table 3: Banned refrigeration applicants under F-gas regulation [Adapted from table 3 (Lindley, 2005)] Type of Gas Prohibited Usage Date of prohibition Fluorinated greenhouse gases Non-refillable containers Start of F-Gas Regulations Fluorinated greenhouse gases Windows for domestic use Start of F-Gas Regulations Fluorinated greenhouse gases Other windows One year after the Start of F-Gas Regulations Fluorinated greenhouse gases Footwear 1 July 2006 Fluorinated greenhouse gases Tyres Start of F-Gas Regulations Fluorinated greenhouse gases One component foams One year after the Start of F-Gas Regulations (except when required to meet national safety standards Hydrofluorocarbons and perfluorocarbons Refrigerants in non-confined direct-evaporation systems Start of F-Gas Regulations Perfluorocarbons Fire protection systems and fire extinguishers Start of F-Gas Regulations Hydrofluorocarbons Novelty aerosols Two years after the Start of F-Gas Regulations Q2iii) F-Gas regulations put restrictions on the many uses of fluorinated gases. One such restriction is that of HFC-134a in mobile air-conditioning units, such as those used in cars. The popularity of air-conditioning in cars has been rising steadily since the early 1990s, such that now over 80% of cars in Europe have this feature installed. While the HFC-134a system is much more efficient than the earlier CFC systems, using less than half of the 1.5kgs of gas that they used, and further research was being carried out in order to make more efficient systems, the EU has still decided to prohibit their future usage, having the use of the gas gradually phased out until 2017 when its usage is completely banned. This will have a considerable effect on the HFC134a industry as its usage in cars and other similar transport makes up a considerable part of their market. In turn, car manufacturers will have to develop new air-conditioning systems in cars, and this will drive up the cost of newer car models to counter development costs. (Lindley, 2005) 3) Ever since the realisation of mankinds negative impact on the environment, preventative measures have been put in place to try and reverse them, and several different pieces of legislation help to ensure that this is the case. The Montreal protocol, which banned the usage of CFCs and HCFCs, was created to help protect the ozone layer from further harm. In this regard, the protocol can be considered a success. Levels of ozone damaging gases in the atmosphere have been steadily falling, and it is estimated that the ozone layer could have repaired itself as early as 2050 (WMO, 2006). However, the replacement of CFCs and HCFCs with fluorinate gases to combat the destruction of the ozone layer lead to more environmental concerns, namely that these fluorinated greenhouse gases were making a significant impact on global warming. While the impact of these gases on global warming may be less than that of some other greenhouse gases (namely CO2) their effects are still considerable, and several pieces of legislation have been set up to try and decrease their usage. Firstly, the Kyoto protocol listed several fluorinated greenhouse gases, including HFCs, PFCs and SF6, along with CO2, CH4 and N2O, as gases that must have their levels of emissions decreased. The F-Gas regulation, making reference to the Kyoto protocol, set regulations on the usage of the HFCs and PFCs, helping to reduce their prevalence in society. Despite this, global warming problems continue to rise, thanks to increasing atmospheric levels of CO2. As long as CO2 is so prevalent in the atmosphere, reducin g the effects of comparatively less harmful fluorinated gases through legislation can only do so much in helping to combat the rising problems of global warming (Lindley, 2005 Website 2)

Benefits of Educating Employees

Is it possible for a business to increase productivity by offering workplace computer literacy training to their employees? This paper asked the question: Are there benefits to employers that provide workplace education and training, above and beyond increased competency? The answer, as reported by research, is a resounding yes. Benefits such as increased self-confidence, increased adaptability, flexibility, the willingness to accept change and increased success in job-related training plus increased skills were reportedly derived from the workplace competency training offered.Moreover these benefits translated into more productivity for the organization. Benefits of Educating Employees Introduction With the rapid changes taking place in our world economy, researching the question of workplace education benefits is significant. The question arose whether the workforce is sufficiently educated to compete in a global economy. The research pointed to competency as being imperative in to day's global economy, which implies an acceptance of computer competency. Education and competency training is defined as more than being able to work, but to make decisions.It is defined as being an important adjunct of technology. Education of skills, particularly computer competency and how they function gave the employees an overview of the system as a whole. It helped them understand how their machine worked and gave them an impetus to look for solutions themselves. This transcended into time saved and increased efficiency. The paper also indicated that companies which supported education in the workforce benefited because their employees exhibited improved self-confidence which translated into increased productivity and performance.More flexibility and a willingness to accept change were also deemed to benefits received from competency and skills training. Next point showed how computer literacy training benefited companies by helping their employees understand the computerize d equipment they were working on. This understanding translated into: increased self-confidence, increased adaptability and flexibility, increased production as well as the willingness to take other training and succeed at same. Education and training today does include competency and skills not only in offices but also on shop floors.The benefits to providing workplace competency and skills training to employees are multifaceted. It may lessen the time it takes for people to learn. Return on investment is always of interest to businesses and organizations. The paper illustrated how employees, managers, supervisors as well as trainers observed behaviors from participants in the training, which reflected savings and profit for the organization. Some of the benefits are: saving time, increased production, increased flexibility, willingness to ask questions and changed attitudes.The paper points out how important it is to prepare to evaluate the training at the beginning of a project i n order to determine what the organization is really trying to achieve with this specific training. The research concludes by looking at the organizational implications of offering workplace competency and skills training. Education and Competency Training Benefits There has been a great deal of information published on competency training done in the workplace.For example, in the 1997 report, The Impact of Basic Skills Programs on Canadian Workplaces: Results of a National Study for ABC CANADA Competency Foundation, the following information was reported. â€Å"The study consisted of in-depth phone interviews with 86 individuals from 53 workplaces that have had basic skills programs for at least one year. Sixty percent of the individuals interviewed were employer representatives and 40% were employee representatives. † (n. d. , The Benefits of Improving Competency Skills in the Workplace) The following are impacts to the workplace identified by the study: †¢ increases i n the quality of work – 84%†¢ increased work effort – 73% †¢ more competent use of technology – 87%. (ABC CANADA Competency Foundation, The Benefits of Improving Competency Skills in the Workplace, n. d. ) Bloom and LaFleur's (1999) report on improving competency skills through workplace education programs, indicates that â€Å"Although the impact of basic skills training on profits varies according to the value and shortage of a given skill or group of skills within a particular business sector, employers overwhelmingly report increased profits and other bottom-line benefits when their employees gain basic skills that enable them to work more effectively.† (p. 4) On page six of this report there is a list of eleven skills gained by employees who participated in workplace education programs as well as a list of twenty three organizational benefits gained by the employers. Willis (1994) reports that working with employees to expand workplace comp etency at the Peavey Electronics Corporation the following results were noted: â€Å"all employees had statistically significant increases in job performance with the areas of attitude, getting the job done, volunteering, doing extra, and dependability showing the most improvement.† (p. 25) U. S. Department of Labor (1992) states that: â€Å"A high-performance workplace requires workers who have a solid foundation in the basic competency and computational skills, the thinking skills, and in the personal qualities that make workers dedicated and trustworthy†¦ (p. 5). High-performance workplaces also require competencies: the ability to manage resources, to work amicably and productively with others, to acquire and use information, to master complex systems, and to work with a variety of technologies. † (p. 6)According to Dr. Harvey Krahn (1998) workplace competency programs target people with very low competency skills; however, if we look at competency as a contin uum, businesses will recognize that it will benefit them to develop competency in people at all levels in the workplace. Bloom and LaFleur research (1999) has shown that â€Å"improving employee's skills creates employees who work smarter and better and who cope well with change in the workplace, improves union/management relations and increases output and profitability. † (p.3) The above speak of all competencies being important in the workplace. What challenges arise for businesses if employees are not literate? Bloom, Campbell and Gagnon (2001) speak of competency as being a crucial role in corporate competitiveness and productivity. They talk of globalization threatening U. S. ‘s economy and of people being a prime competitive advantage in the new economy. They maintain that U. S. ‘s traditional advantage of having a skilled workforce is being threatened by other countries gaining knowledge and improving the competency skills of their workers.They list the ben efits to employers who work to increase the competency skills of their employees as: improved production and income, cost savings, better communication and employee retention as well as improved health and safety. For employees some of the benefits listed are higher income, more job security, less unemployment, improved self-confidence, more opportunities for job training, better attitude. (GAM, 2005) Benefits Specific to Computer Based Training The importance of computer training in today's workplace is shown by the following statistics. More than one-half of all workers in U. S. now use a computer on the job.Data from the General Social Survey, on which the article is based, show that an estimated 8. 3 million workers, or 57% of the total employed, used a computer at their main job in 2000, compared with 33% in 1989 (Marshall, 2001, pp. 1-2). Ginsbury and Elmore (1998, p. 2) point out that computer training can save employees time to â€Å"compile and manage large data†; th erefore, there is more time to spend on â€Å"creative, higher level work that that depends on the quick availability and quick manipulation of information†. They go on to say that much learning has been removed from the â€Å"objects of work whether a machine part, raw data or communication.† They speak of workers who fear technology or have difficulty learning new or upgraded technology as being liable to end up at the â€Å"lower end of a professional hierarchy. † Leckie, Leonard, Turcotte and Wallace (2001, p. 1) talk of work â€Å"evolving as the result of globalization, increased competition, the development of new technologies and other changes in the business environment. In the face of these trends, businesses are adopting new technologies and ways of organizing work to attain efficiency and productivity gains† (p. 9).They speak of businesses being wiser to retain their skilled employees rather than hire new, technically trained employees. They s uggest that computer training can promote employee movement within a firm. Then firms have the best of both worlds, an employee who is experienced with the organization and has upgraded skills. They talk of new technology requiring new skills to be able to adapt to changing markets. They point to â€Å"job rotation, flexible job design and work teams† (p. 11) as giving employers the flexibility to have employees that will be able to adapt to change.They point to the effect of technological training for employees – if they become unemployed they have an easier time finding a job. They speak of computer training as being able to help employees deal with change as well as help them improve their performance and add to job satisfaction. McNeill (2000, p. 3) talks of computer competency at the executive level, as being more than â€Å"just using email and pulling files off the Web and so forth. We live in an increasingly high-tech world and overnight redundancies have beco me the norm. Companies that can't assess these changes can easily get left behind.† He goes on to speak of downsizing and how computer competency is not listed as a reason to downsize; however, firms who have a choice of someone who is computer literate and someone of comparable skills that is not, will most likely choose to keep the person with computer skills. Computer based training attracts many and varied employees in the workplace. Most studies and papers state that computer training is beneficial to employees because it allows them the confidentiality to study what they need without others knowing. For instance there are many computer programs written which teach different skills.Also the training can be self-paced so there is no pressure to keep up. A bonus is if there are computer labs at work, employees can study when there is a suitable time in their schedule, such as lunch breaks, coffee breaks and before or after work. (Rae, O'Driscoll, 2004) I believe that traini ng and education, especially computer is and will continue to be, very important to both employers and employees. As the information society develops, information and the know-how based on it will become more and more decisive as factors of production.Networking based on the application of information and communications technology, especially telecommunications, is a major trend. As well as creating new ways of communicating and working, information technology has made possible new methods of producing and distributing products and services (UNESCO, 2002, section 2. 1). Technological competency—meaning computer skills and the ability to use computers and other technology to improve learning, productivity and performance—has become as fundamental to a person's ability to navigate through society as traditional skills like reading, writing and arithmetic †¦ (Selfe, 1998, p. 1).

Abstract. The Purpose Of This Literature Review Is To Compare

Abstract The purpose of this literature review is to compare the benefits and risks of electronic health records (EHRs). This literature review has provided different journal articles to compare the risks and the benefits of having electronic health records in a hospital. Some of the articles believe that the use of EHRs in a hospital will be more effective and helpful while others suggest that the use of EHRs in a hospital will not be beneficial due to the complications that may arise with it. The methods used will be comparing different journal articles and comparing them with each other. In conclusion, the use of electronic health records in hospitals will be beneficial for both patients and doctors because it allows the doctors to†¦show more content†¦The research problem is whether or not EHRs are beneficial for hospitals. Methods In order to be able to depict if EHRs would be beneficial or risky to use in hospital, there were several different journal article that were evaluated. There were different articles that used EHRs in hospitals and found it to be beneficial and there were hospitals that used EHRs and found that it caused several problems. The different articles talked about how the EHRs are going to benefit the hospitals so that they can get things done in a timely and effective manner. The articles that discussed the risks talked about the different problems that could arise when using EHRs in the hospital. The date limitations that were used is no older articles than 10 years old. The language limitations were a little difficult because there were many studies done in different locations other than the United States. Other limitations included many articles talked about the benefits and risks of having EHRs, but they did not give clear and concise examples. Findings In Aragon, Cortelyou-Ward, Noblin, Bullard, Talbert, Wilson, and Briscoe study, they discussed how the EHRs can be accessed easily and it is easily viewed by both the nurses and doctors (2014). Another article discusses the benefits of the HER systems. It allows for labs and healthcare professionals to easily communicate their information to each other. (Gluskin, 2014). Meyerhoefer, Deily, Sherer, Chou, Peng, Sheinberg, LevickShow MoreRelatedIntegumentary System Of Skin1308 Words   |  6 Pageshealing have varied. The written history of burn treatments began in 1500 BC and advancements in treatments have continued into the 21st century. Early burn treatment in 1500 BC involved using calf dung and black mud.5 There was a notable increase in literature on wound healing in the 20th century. In the late 20th and early 21st century, burn treatment began to vary based on depth of burn. 5 Skin grafts are a type of burn treatment that has evolved rapidly in the last hundred years. 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My Responsibility As A Risk Management Professional

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