Going Green with IT: A Study of Energy Consumption by Home and School Information Technology Systems in the College of Information at the University of North Texas

This paper addresses the strategies introduced by the College of Information at the University of North Texas to monitor and begin implementing approaches to enable the college to move toward the university???s strategic goal of becoming a climate-neutral, ???Green University??? [3]. Data based on monitoring selected office and home inventories of information technology equipment were used to generate estimated production-level use and standby (vampire) consumption of electrical energy. Sample-based estimations and projections regarding 2008 to 2009 progress indicate that that the College of Information at the University of North Texas has made extensive progress over one year in reducing the energy consumed by its information technology systems. New computer and printer systems have greater processing power and capabilities but consume no more power than the ones they replace, when in full operation. The computer systems consume one-half to one-third (and in some cases oneseventh) the power of the previous systems when in 'sleep???, 'hibernate' or 'shut down' states that qualify for the standard definition of consuming stand by power. The authors estimate that these actions have brought the college at least halfway toward its five-year goal of becoming climate neutral, during the first year of the initiative

Energy-Efficient Streaming Using Non-volatile Memory

The disk and the DRAM in a typical mobile system consume a significant fraction (up to 30%) of the total system energy. To save on storage energy, the DRAM should be small and the disk should be spun down for long periods of time. We show that this can be achieved for predominantly streaming workloads by connecting the disk to the DRAM via a large non-volatile memory (NVM). We refer to this as the NVM-based architecture (NVMBA); the conventional architecture with only a DRAM and a disk is referred to as DRAMBA. The NVM in the NVMBA acts as a traffic reshaper from the disk to the DRAM. The total system costs are balanced, since the cost increase due to adding the NVM is compensated by the decrease in DRAM cost. We analyze the energy saving of NVMBA, with NAND flash memory serving as NVM, relative to DRAMBA with respect to (1) the streaming demand, (2) the disk form factor, (3) the best-effort provision, and (4) the stream location on the disk. We present a worst-case analysis of the reliability of the disk drive and the flash memory, and show that a small flash capacity is sufficient to operate the system over a year at negligible cost. Disk lifetime is superior to flash, so that is of no concern

Towards an Efficient Context-Aware System: Problems and Suggestions to Reduce Energy Consumption in Mobile Devices

Looking for optimizing the battery consumption is an open issue, and we think it is feasible if we analyze the battery consumption behavior of a typical context-aware application to reduce context-aware operations at runtime. This analysis is based on different context sensors configurations. Actually existing context-aware approaches are mainly based on collecting and sending context data to external components, without taking into account how expensive are these operations in terms of energy consumption. As a first result of our work in progress, we are proposing a way for reducing the context data publishing. We have designed a testing battery consumption architecture supported by Nokia Energy Profiler tool to verify consumption in different scenarios

Low-energy standby-sparing for hard real-time systems

Time-redundancy techniques are commonly used in real-time systems to achieve fault tolerance without incurring high energy overhead. However, reliability requirements of hard real-time systems that are used in safety-critical applications are so stringent that time-redundancy techniques are sometimes unable to achieve them. Standby sparing as a hardwareredundancy technique can be used to meet high reliability requirements of safety-critical applications. However, conventional standby-sparing techniques are not suitable for lowenergy hard real-time systems as they either impose considerable energy overheads or are not proper for hard timing constraints. In this paper we provide a technique to use standby sparing for hard real-time systems with limited energy budgets. The principal contribution of this work is an online energymanagement technique which is specifically developed for standby-sparing systems that are used in hard real-time applications. This technique operates at runtime and exploits dynamic slacks to reduce the energy consumption while guaranteeing hard deadlines. We compared the low-energy standby-sparing (LESS) system with a low-energy timeredundancy system (from a previous work). The results show that for relaxed time constraints, the LESS system is more reliable and provides about 26% energy saving as compared to the time-redundancy system. For tight deadlines when the timeredundancy system is not sufficiently reliable (for safety-critical application), the LESS system preserves its reliability but with about 49% more energy consumptio

Evaluation of a Pervasive Game for Domestic Energy Engagement Among Teenagers

In this article, we present Power Agent—a pervasive game designed to encourage teenagers and their families to reduce energy consumption in the home. The ideas behind this mobile phonebased game are twofold; to transform the home environment and its devices into a learning arena for hands-on experience with electricity usage and to promote engagement via a team competition scheme. We report on the game’s evaluation with six teenagers and their families who played the game for ten days in two cities in Sweden. Data collection consisted of home energy measurements before, during, and after a game trial, in addition to interviews with participants at the end of the evaluation. The results suggest that the game concept was highly efficient in motivating and engaging the players and their families to change their daily energy-consumption patterns during the game trial. Although the evaluation does not permit any conclusions as to whether the game had any postgame effects on behavior, we can conclude that the pervasive persuasive game approach appears to be highly promising in regard to energy conservation and similar fields or issues

ICT entertainment appliances’ impact on domestic electricity consumption

Increased electricity consumption and environmental impacts of Information Communication Technology (ICT) have been subjects of research since the 1990s. This paper focuses on consumer electronics in households, in particular TVs, computers and their peripherals. ICT accounts for almost 15% of global domestic electricity use, including waste energy from devices left on standby which is estimated in the EU-27 to contribute 6% of residential energy demand. In Europe, the household electricity consumption from small electronic appliances, including ICT, increased by 2.5 times in 2011 compared to 1990. Similarly, in the UK, energy demand from electronic devices accounted for 23% of total household electricity use in 2012, compared to 12% in 1990. This is an outcome of the market saturation of new, cheaper ICT entertainment devices, facilitated by marketing strategies which identify new needs for consumers, as charted by the review of market growth in this paper. New increasingly portable laptops, smart phones and tablets with wireless connectivity allow householders to perform a wider range of activities in a wider range of locations throughout the home, such as social networking while the television is active. We suggest that policies which consider how to increase the energy efficiency of ICT devices alone are unlikely to be successful since effective strategies need to address how the drivers which have developed around the use of ICT can be adapted in order to conserve electricity in households. A range of policy solutions are discussed, including feedback, public information campaigns, environmental education, energy labelling, bans of, or taxation on the least efficient products as well as the use of a TV as central hub to perform the existing functions of multiple devices

Computer Energy Use: How Does Awareness Impact Behavior?

As universities search for ways to cut costs in a tough economic climate, many are attempting to make their buildings more efficient in order to save energy and reduce expenditures. While implementing efficient technologies is an important first step to reducing consumption, encouraging energy conservation behavior is also a key component. A significant source of energy consumption that can be reduced with behavior change is computer usage. Desktop computers consume an average of 60-500 watts when in active use, whereas in standby energy use drops to 2-6 watts. Translated into kilowatt hours, a computer using 60 watts for one hour will use 60 watt hours or .06kWh. With the current average price at $0.13 per kWh and assuming that most computers are left on for 24 hours a day without utilizing standby mode, the cost can range from$70-$600 per computer per year. With an estimated 10,000 computers on the URI Kingston Campus, energy consumption and energy costs are significant. The objective of this project is to measure the effectiveness of providing a simple educational message to encourage computer users to put their computers in standby mode when not in use. The project will begin by using energy meters to measure baseline energy use in a computer lab. Concurrently, a survey will be conducted to quantify student computer usage and to identify attitudes and awareness of computer energy use issues. Based on survey results, a simple educational message asking students to put their computers in standby mode will be designed for display in the computer lab. The effectiveness of the message as a tool to change student behavior will be assessed by measuring energy use in the lab after the message has been displayed. The results of the study will provide guidance to campus leaders regarding the effectiveness of a low cost educational program to reduce computer energy consumption. The project will help university officials evaluate whether an investment in a more expensive energy management program is warranted to reduce computer energy consumption or if education alone can reduce energy use

A socio-technical investigation into the electrical end use patterns of information, communication and entertainment technologies in UK homes.

Information, communication and entertainment (ICE) appliances are consumer electronics and information and communication technologies (ICT). Forecasts suggest that ICE appliance use will soon become the most significant domestic electricity end-use in the UK. Knowledge concerning “real world” ICE electricity consumption is currently limited and it has been suggested that this deficiency could lead to ineffective policy programmes. This socio-technical study measured ICE appliance electricity consumption in fourteen UK households’ and undertook household interviews to explore the behavioural factors that influenced the measurements recorded. The interviews were informed by two social psychology theories: (i) Triandis’ (1977) Theory of Interpersonal Behaviour (TIB); (ii) Rogers’ (2003) Diffusion of Innovations Theory (DIT). The study supports the position that ICE appliance use and standby power consumption are significant electricity end-uses in UK homes. Key appliances that contributed to the sample’s average electricity consumption are identified. Inconspicuous electricity consumption from network appliances is an issue of particular concern due to policy gaps. The interviews found that a range of internal and external factors influenced ICE appliance use. Behavioural intentions and habits were found to be facilitated or impeded by personal ability, knowledge and physical constraints. Social structures and expectations also supported the more expansive ownership and use of ICE appliances and energy consumption was an issue largely excluded from adoption decisions. The findings imply that a multifaceted approach is required to reduce household ICE appliance electricity consumption. This study supports the recent implementation of minimum energy performance standards and provides further recommendations that include: (i) improved product design; (ii) the expansion of mandatory energy labelling; (iii) improved electricity consumption feedback in UK homes; (iv) the use of behaviour change campaigns; (v) the integration of ICE appliance energy saving objectives into UK policies