Efficiency

1. Efficiency https://store.theartofservice.com/the-efficiency-toolkit.html

2. Data center Energy efficiency • The most commonly used metric to determine the energy efficiency of a data center is power usage effectiveness, or PUE. This simple ratio is the total power entering the data center divided by the power used by the IT equipment. https://store.theartofservice.com/the-efficiency-toolkit.html

3. Data center Energy efficiency • Some large data center operators like Microsoft and Yahoo! have published projections of PUE for facilities in development; Google publishes quarterly actual efficiency performance from data centers in operation. https://store.theartofservice.com/the-efficiency-toolkit.html

4. Data center Energy efficiency • The U.S. Environmental Protection Agency has an Energy Star rating for standalone or large data centers. To qualify for the ecolabel, a data center must be within the top quartile of energy efficiency of all reported facilities. https://store.theartofservice.com/the-efficiency-toolkit.html

5. Data center Energy efficiency • European Union also has a similar initiative: EU Code of Conduct for Data Centres https://store.theartofservice.com/the-efficiency-toolkit.html

6. Data center Energy efficiency analysis • An energy efficiency analysis measures the energy use of data center IT and facilities equipment. A typical energy efficiency analysis measures factors such as a data center’s power use effectiveness (PUE) against industry standards, identifies mechanical and electrical sources of inefficiency, and identifies air-management metrics. https://store.theartofservice.com/the-efficiency-toolkit.html

7. Inventory management software - Increased efficiency • Inventory management software often allows for automation of many inventory-related tasks. For example, software can automatically collect data, conduct calculations, and create records. This not only results in time savings, cost savings, but also increases business efficiency. https://store.theartofservice.com/the-efficiency-toolkit.html

8. Memory management - Efficiency • The specific dynamic memory allocation algorithm implemented can impact performance significantly. A study conducted in 1994 by Digital Equipment Corporation illustrates the overheads involved for a variety of allocators. The lowest average instruction path length required to allocate a single memory slot was 52 (as measured with an instruction level profiler on a variety of software). https://store.theartofservice.com/the-efficiency-toolkit.html

9. Entropy (information theory) - Efficiency • A source alphabet with non-uniform distribution will have less entropy than if those symbols had uniform distribution (i.e. the "optimized alphabet"). This deficiency in entropy can be expressed as a ratio: https://store.theartofservice.com/the-efficiency-toolkit.html

10. Entropy (information theory) - Efficiency • Efficiency has utility in quantifying the effective use of a communications channel. This formulation is also referred to as the normalized entropy, as the entropy is divided by the maximum entropy . https://store.theartofservice.com/the-efficiency-toolkit.html

11. MAPPER - Real-time efficiency • In the operation of MAPPER, the data are not obtained by a program that "reads" them, but the data wait for action. The programmed commands are brought to operate upon it. However, the complete set of available commands remains in the active memory of the computer. Being written in "re-entrant code", any command can be used by many hundreds of different users at the same time. https://store.theartofservice.com/the-efficiency-toolkit.html

12. MAPPER - Real-time efficiency • To avoid a bottleneck in disk accesses, the data are kept in screen display format. This results in the average number of disk reads per report display to be less than two. https://store.theartofservice.com/the-efficiency-toolkit.html

13. MAPPER - Real-time efficiency • The addition of new "records" to a long report can involve high disk activity and render a system non-responsive. The Coordinator monitors the length of reports and will guide a users in protecting the fast response times wanted. https://store.theartofservice.com/the-efficiency-toolkit.html

14. Software quality - Efficiency • As with Reliability, the causes of performance inefficiency are often found in violations of good architectural and coding practice which can be detected by measuring the static quality attributes of an application. These static attributes predict potential operational performance bottlenecks and future scalability problems, especially for applications requiring high execution speed for handling complex algorithms or huge volumes of data. https://store.theartofservice.com/the-efficiency-toolkit.html

15. Software quality - Efficiency • Assessing performance efficiency requires checking at least the following software engineering best practices and technical attributes: https://store.theartofservice.com/the-efficiency-toolkit.html

16. Software quality - Efficiency • Application Architecture Practices https://store.theartofservice.com/the-efficiency-toolkit.html

17. Software quality - Efficiency • Appropriate interactions with expensive and/or remote resources https://store.theartofservice.com/the-efficiency-toolkit.html

18. Software quality - Efficiency • Compliance with Object-Oriented and Structured Programming best practices (as appropriate) https://store.theartofservice.com/the-efficiency-toolkit.html

19. LED street light - Energy efficiency • The primary appeal of LED street lighting is energy efficiency compared to conventional street lighting fixture technologies such as high pressure sodium (HPS) and metal halide (MH). Research continues to improve the efficiency of newer models. One such advance can be found in a street light product created by Lighting Science Group Corporation. One model of LED street lights produced by this group is up to 60 percent more efficient than previous models, lasts for 12 years. https://store.theartofservice.com/the-efficiency-toolkit.html

20. LED street light - Energy efficiency • An LED street light based on a 901 milliwatt output LED can normally produce the same amount of (or higher) luminance as a traditional light, but requires only half of the power consumption. LED lighting does not typically fail, but instead decreases in output until it needs to be replaced. https://store.theartofservice.com/the-efficiency-toolkit.html

21. LED street light - Energy efficiency • As the LED lighting fixtures normally produce less lumen/Watt illumination it is very crucial to have a well distributed illumination pattern in order to do the same job as higher lumen/Watt conventional fixtures. So a good design of LED street lights is to point different LEDs in one fixture to different target points. https://store.theartofservice.com/the-efficiency-toolkit.html

22. Emirates (airline) - Fleet efficiency • Emirates has stated that its versions of the A380-800 will offer fuel economy of 3.1 litres per 100 passenger km. Emirates A380-800s also feature the Engine Alliance GP7200 engines, which save 500,000 litres of fuel per aircraft per year. https://store.theartofservice.com/the-efficiency-toolkit.html

23. Emirates (airline) - Fleet efficiency • The company uses a program called "Flextracks". The technology is used to plan and optimize routes efficiency and load factor. Passenger load factors were 81.2% in the 6 months to September 2010. https://store.theartofservice.com/the-efficiency-toolkit.html

24. Emirates (airline) - Fleet efficiency • Emirates has invested in a program called "tailored arrivals". This allows air traffic control to uplink to aircraft en route. It first determines the speed and flight profile from the air onto the runway, this allows the crew to accept and fly a continuous descent profile, saving fuel and emissions. https://store.theartofservice.com/the-efficiency-toolkit.html

25. Heat sink - Fin efficiency • Fin efficiency is defined as the actual heat transferred by the fin, divided by the heat transfer were the fin to be isothermal (hypothetically the fin having infinite thermal conductivity) https://store.theartofservice.com/the-efficiency-toolkit.html

26. Heat sink - Fin efficiency • k is the thermal conductivity of the fin material https://store.theartofservice.com/the-efficiency-toolkit.html

27. Heat sink - Fin efficiency • Fin efficiency is increased by decreasing the fin aspect ratio (making them thicker or shorter), or by using more conductive material (copper instead of aluminium, for example). https://store.theartofservice.com/the-efficiency-toolkit.html

28. Smart grid - Efficiency • Numerous contributions to overall improvement of the efficiency of energy infrastructure is anticipated from the deployment of smart grid technology, in particular including demand-side management, for example turning off air conditioners during short-term spikes in electricity price. The overall effect is less redundancy in transmission and distribution lines, and greater utilisation of generators, leading to lower power prices. https://store.theartofservice.com/the-efficiency-toolkit.html

29. Green building - Siting and structure design efficiency • The foundation of any construction project is rooted in the concept and design stages https://store.theartofservice.com/the-efficiency-toolkit.html

30. Green building - Energy efficiency • Green buildings often include measures to reduce energy consumption – both the embodied energy required to extract, process, transport and install building materials and operating energy to provide services such as heating and power for equipment. https://store.theartofservice.com/the-efficiency-toolkit.html

31. Green building - Energy efficiency • As high-performance buildings use less operating energy, embodied energy has assumed much greater importance – and may make up as much as 30% of the overall life cycle energy consumption. Studies such as the U.S. LCI Database Project show buildings built primarily with wood will have a lower embodied energy than those built primarily with brick, concrete, or steel. https://store.theartofservice.com/the-efficiency-toolkit.html

32. Green building - Energy efficiency • To reduce operating energy use, designers use details that reduce air leakage through the building envelope (the barrier between conditioned and unconditioned space) https://store.theartofservice.com/the-efficiency-toolkit.html

33. Green building - Energy efficiency • Onsite generation of renewable energy through solar power, wind power, hydro power, or biomass can significantly reduce the environmental impact of the building. Power generation is generally the most expensive feature to add to a building. https://store.theartofservice.com/the-efficiency-toolkit.html

34. Green building - Water efficiency • Point of use water treatment and heating improves both water quality and energy efficiency while reducing the amount of water in circulation https://store.theartofservice.com/the-efficiency-toolkit.html

35. Green building - Materials efficiency • Building materials typically considered to be 'green' include lumber from forests that have been certified to a third-party forest standard, rapidly renewable plant materials like bamboo and straw, dimension stone, recycled stone, recycled metal (see: copper sustainability and recyclability), and other products that are non-toxic, reusable, renewable, and/or recyclable (e.g., Trass, Linoleum, sheep wool, panels made from paper flakes, compressed earth block, adobe, baked earth, rammed earth, clay, vermiculite, flax linen, sisal, seagrass, cork, expanded clay grains, coconut, wood fibre plates, calcium sand stone, concrete (high and ultra high performance, roman self-healing concrete), etc.) The EPA (Environmental Protection Agency) also suggests using recycled industrial goods, such as coal combustion products, foundry sand, and demolition debris in construction projects Building materials should be extracted and manufactured locally to the building site to minimize the energy embedded in their transportation https://store.theartofservice.com/the-efficiency-toolkit.html

36. Standard RAID levels - Efficiency (potential waste of storage) • RAID 6 is no less space efficient than RAID 5 with a hot spare drive when used with a small number of drives, but as arrays become bigger and have more drives, the loss in storage capacity becomes less important, although the probability of data loss is greater with larger arrays https://store.theartofservice.com/the-efficiency-toolkit.html

37. Standard RAID levels - Efficiency (potential waste of storage) • The usable capacity of a RAID 6 array is , where is the total number of drives in the array and is the capacity of the smallest drive in the array. https://store.theartofservice.com/the-efficiency-toolkit.html

38. Functional programming - Efficiency issues • Functional programming languages are typically less efficient in their use of CPU and memory than imperative languages such as C and Pascal https://store.theartofservice.com/the-efficiency-toolkit.html

39. Functional programming - Efficiency issues • Immutability of data can in many cases lead to execution efficiency by allowing the compiler to make assumptions that are unsafe in an imperative language, thus increasing opportunities for inline expansion. https://store.theartofservice.com/the-efficiency-toolkit.html

40. Functional programming - Efficiency issues • Lazy evaluation may also speed up the program, even asymptotically, whereas it may slow it down at most by a constant factor (however, it may introduce memory leaks if used improperly) https://store.theartofservice.com/the-efficiency-toolkit.html

41. Hydrogen economy - Efficiency as an automotive fuel • Hydrogen has been called one of the least efficient and most expensive possible replacements for gasoline (petrol) in terms of reducing greenhouse gases; other technologies may be less expensive and more quickly implemented https://store.theartofservice.com/the-efficiency-toolkit.html

42. Hydrogen economy - Efficiency as an automotive fuel • Subtracting this energy from the enthalpy of one kilogram of hydrogen, which is 141 megajoules, and dividing by the enthalpy, yields a thermal energy efficiency of roughly 60% https://store.theartofservice.com/the-efficiency-toolkit.html

43. Hydrogen economy - Efficiency as an automotive fuel • A study of the well-to-wheels efficiency of hydrogen vehicles compared to other vehicles in the Norwegian energy system indicates that hydrogen fuel-cell vehicles tend to be about a third as efficient as EVs when electrolysis is used, with hydrogen Internal Combustion Engines (ICE) being barely a sixth as efficient https://store.theartofservice.com/the-efficiency-toolkit.html

44. Concentrated solar power - Efficiency • For thermodynamic solar systems, the maximum solar-to-work (ex: electricity) efficiency can be deduced by considering both thermal radiation properties and Carnot's principle. Indeed, solar irradiation must first be converted into heat via a solar receiver with an efficiency ; then this heat is converted into work with Carnot efficiency . Hence, for a solar receiver providing a heat source at temperature TH and a heat sink at temperature T° (e.g.: atmosphere at T° = 300 K) : https://store.theartofservice.com/the-efficiency-toolkit.html

45. Concentrated solar power - Efficiency • where , , are respectively the incoming solar flux and the fluxes absorbed and lost by the system solar receiver. https://store.theartofservice.com/the-efficiency-toolkit.html

46. Concentrated solar power - Efficiency • For a solar flux I (e.g. I = 1000 W/m2) concentrated C times with an efficiency on the system solar receiver with a collecting area A and an absorptivity : https://store.theartofservice.com/the-efficiency-toolkit.html

47. Concentrated solar power - Efficiency • For simplicity's sake, one can assume that the losses are only radiative ones (a fair assumption for high temperatures), thus for a reradiating area A and an emissivity applying the Stefan-Boltzmann law yields: https://store.theartofservice.com/the-efficiency-toolkit.html

48. Concentrated solar power - Efficiency • Simplifying these equations by considering perfect optics (= 1), collecting and reradiating areas equal and maximum absorptivity and emissivity ( = 1, = 1) then substituting in the first equation gives https://store.theartofservice.com/the-efficiency-toolkit.html

49. Concentrated solar power - Efficiency • One sees that efficiency does not simply increase monotonically with the receiver temperature. Indeed, the higher the temperature, the higher the Carnot efficiency, but also the lower the receiver efficiency. Hence, the maximum reachable temperature (i.e.: when the receiver efficiency is null, blue curve on the figure below) is: https://store.theartofservice.com/the-efficiency-toolkit.html

50. Concentrated solar power - Efficiency • There is a temperature Topt for which the efficiency is maximum, i.e. when the efficiency derivative relative to the receiver temperature is null: https://store.theartofservice.com/the-efficiency-toolkit.html