refrigerant chart!

refrigerant chart

Comprehensive Analysis

1) "Refrigerant" -- As to refrigerant chart 1re·frig·er·ant Pronunciation: ri-'fri-j&-r&nt, -'frij-r&nt Function: adjective : allaying heat or fever Pronunciation Symbols A refrigerant is a compound used in a heat cycle that undergoes a phase change from a gas to a liquid and back. The two main uses of refrigerants are refrigerators/freezers and air conditioners. Cf. coolant. Until concerns about depletion of the ozone layer arose in the 1980s, the most widely used refrigerants were the halomethanes R-12 and R-22, with R-12 being more common in automotive air conditioning and small refrigerators, and R-22 being used for residential and light commmercial air conditioning, refrigerators, and freezers. Some very early systems used R-11 because its low boiling point allows low-pressure systems to be constructed, reducing the mechanical strength required for components. New production of R-12 ceased in the United States in 1995, and R-22 is to be phased out in 2010. R-134a and certain blends are now replacing chlorinated compounds. One popular 50/50 blend of R-32 and R-125 now being increasingly substituted for R-22 is marketed under the trade name PuronĀ® and another one as R410a. While the R-22, R-12 and other ozone depleting refrigerants are being phased out, they still have value and can be easily sold. The ideal refrigerant has good thermodynamic properties, is noncorrosive, and safe. The desired thermodynamic properties are a boiling point somewhat below the target temperature, a high heat of vaporization, a moderate density in liquid form, and a relatively high density in gaseous form. Since boiling point and gas density are affected by pressure, refrigerants may be made more suitable for a particular application by choice of operating pressure. Corrosion properties are a matter of materials compatibility with the components used for the compressor, piping, evaporator, and condenser. Safety considerations include toxicity and flammability. Early mechanical refrigeration systems employed sulfur dioxide gas or anhydrous ammonia, with small home refrigerators primarily using the former. Be..." 2) "Chart" -- As to refrigerant chart 1chart Pronunciation: 'chärt Function: noun Etymology: Middle French charte, from Latin charta piece of papyrus, document -- more at CARD 1 : MAP: as a : an outline map exhibiting something (as climatic or magnetic variations) in its geographical aspects b : a map for the use of navigators 2 a : a sheet giving information in tabular form b : GRAPH c : DIAGRAM d : a sheet of paper ruled and graduated for use in a recording instrument e : a record of medical information about a patient f : a listing by rank (as of sales) -- usually used in plural <number one on the charts -- Tim Cahill> 3 : a musical arrangement; also : a part in such an arrangement Pronunciation Symbols A pie chart. A chart or graph is a type of information graphic or graphic organizer that represents tabular numeric data and/or functions. Charts are often used to make it easier to understand large quantities of data and the relationship between different parts of the data. Charts can usually be read more quickly than the raw data that they come from. They are used in a wide variety of fields, and can be created by hand (often on graph paper) or by computer using a charting application. Certain types of charts are more useful for presenting a given data set than others. For example, data that presents percentages of different groups (such as "satisfied, not satisfied, unsure") might be best represented as a pie chart, allowing the viewer to compare the size of each sector slice. On the other hand, data that represents numbers that change over a period of time (such as "satisfaction between 1990 and 2000") might be best shown as a bar chart (or histogram). Usage note: many information graphics or diagrams include the word "chart" in their name but are covered in those other articles (e.g., flowchart, org chart, smith chart). 1 Types of charts 1.1 Common charts 1.2 Less-common charts 1.3 Field-specific charts 2 Well-known (named) charts 3 Charting software A scatterplot uses Cartesian coordinates to show the relation of two or more quantitative variables. A histogram typically shows the quantity of points that fall within various numeric ranges (or bins). A bar chart uses bars to show frequencies or values for different categories. A pie chart shows percentage values as a slice of a pie. A line c..." 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