Are you really bound to hear fan noise when operating a PC? Not by principle. Can an energy efficiency be allocated to the activity of a computer? Not by principle, but the energy consumption can be reduced. What does one of these have to do with the other? Perhaps more than you expect!
Cables with "improved behaviour in the case of a fire" are much more expensive, but not so much better than ordinary PVC cables. This presentation first gives an attractive alternative and then points out a serious gap in the standards.
Die Statistik lügt höchst selten. Die Lüge liegt in deren missbräuchlicher Verwendung und in der Art der Darstellung. Manchmal wird versucht, auf diese Art Probleme zu lösen. So funktioniert das:
Cables with "improved behaviour in the case of a fire" are much more expensive, but not so much better than ordinary PVC cables. This presentation first gives an attractive alternative and then points out a serious gap in the standards.
Die Statistik lügt höchst selten. Die Lüge liegt in deren missbräuchlicher Verwendung und in der Art der Darstellung. Manchmal wird versucht, auf diese Art Probleme zu lösen. So funktioniert das:
Drehstrom-Asynchronmotoren mit Kupferläufern werden mit Permanentmagnet-Synchronmotoren verglichen, und bei verschiedenen Drehzahlen und Drehmomenten werden die Wirkungsgrade gemessen.
In VDE 0100-520 Anhang G wird eine Formel zur Berechnung des Spannungsfalls angegeben. Leider besteht sie im Wesentlichen aus Formfehlern und ist inhaltlich falsch. Wird der Phasenwinkel mit in die Berechnung einbezogen, so sind beide Phasenwinkel, sowohl der Last als auch der Leitung, zu berücksichtigen. Alles andere führt in die Irre.
Three-phase asynchronous induction motors with cast copper rotors are compared to several permanent magnet synchronous motors, and efficiencies are measured.
Muss man sich bei einem PC den Lüfterlärm anhören? Im Prinzip nein.
Kann man einem PC einen Wirkungsgrad zuordnen? Im Prinzip nein, aber man kann den Energie-Verbrauch mindern!
Was hat das Eine mit dem Anderen zu tun?
Mehr als Sie denken!
Description of the physical coherences of railway traction, superiority of electric against diesel traction, technical details, differences between electrical railway traction with trolley wire or accumulator battery to electric cars
Man zahlt den dreifachen Preis für ein Auto, das nur einen Bruchteil des Leistungsumfangs eines konventionellen Fahrzeugs bietet. Dennoch liest man jede Woche in einer anderen Zeitschrift: »Vermarktung der Elektroautos startet!« Wie soll das gehen?
Hinweis: Diese Präsentation enthält Verknüpfungen zu »Wie Energie-effizient ist der Bahnverkehr wirklich?«
Es wird empfohlen, auch diese Präsentation herunter zu laden.
Darstellung der physikalischen Zusammenhänge des Bahn-Antriebs, Überlegenheit elektrischer Traktion, technische Einzelheiten, Unterschiede des elektrischen Antriebs bei der Bahn mit Fahrleitung oder Akkumulator zum Elektroauto
Emmvee Crystal’s off-grid modules are beneficial in grid systems where power fluctuations are prevalent. Off-grid modules provide power as a backup when no active supply of power is possible. Some of the salient features of the off-grid modules are:
1. Class II protection so that the user gets at least two layers of insulation from unintended damage to the equipment
2. Effective tackling of weather conditions such as a strong hail with resistance to speed up to 83 km/h so that your device is not damaged.
3. Excellent operating temperature range.
4. A 3.2 mm high transmission tempered glass that takes the overall performance of this module to a new high.
5. Optimized normal operating cell temperature so that there is no hindrance in an optimized throughput from the product.
Drehstrom-Asynchronmotoren mit Kupferläufern werden mit Permanentmagnet-Synchronmotoren verglichen, und bei verschiedenen Drehzahlen und Drehmomenten werden die Wirkungsgrade gemessen.
In VDE 0100-520 Anhang G wird eine Formel zur Berechnung des Spannungsfalls angegeben. Leider besteht sie im Wesentlichen aus Formfehlern und ist inhaltlich falsch. Wird der Phasenwinkel mit in die Berechnung einbezogen, so sind beide Phasenwinkel, sowohl der Last als auch der Leitung, zu berücksichtigen. Alles andere führt in die Irre.
Three-phase asynchronous induction motors with cast copper rotors are compared to several permanent magnet synchronous motors, and efficiencies are measured.
Muss man sich bei einem PC den Lüfterlärm anhören? Im Prinzip nein.
Kann man einem PC einen Wirkungsgrad zuordnen? Im Prinzip nein, aber man kann den Energie-Verbrauch mindern!
Was hat das Eine mit dem Anderen zu tun?
Mehr als Sie denken!
Description of the physical coherences of railway traction, superiority of electric against diesel traction, technical details, differences between electrical railway traction with trolley wire or accumulator battery to electric cars
Man zahlt den dreifachen Preis für ein Auto, das nur einen Bruchteil des Leistungsumfangs eines konventionellen Fahrzeugs bietet. Dennoch liest man jede Woche in einer anderen Zeitschrift: »Vermarktung der Elektroautos startet!« Wie soll das gehen?
Hinweis: Diese Präsentation enthält Verknüpfungen zu »Wie Energie-effizient ist der Bahnverkehr wirklich?«
Es wird empfohlen, auch diese Präsentation herunter zu laden.
Darstellung der physikalischen Zusammenhänge des Bahn-Antriebs, Überlegenheit elektrischer Traktion, technische Einzelheiten, Unterschiede des elektrischen Antriebs bei der Bahn mit Fahrleitung oder Akkumulator zum Elektroauto
Emmvee Crystal’s off-grid modules are beneficial in grid systems where power fluctuations are prevalent. Off-grid modules provide power as a backup when no active supply of power is possible. Some of the salient features of the off-grid modules are:
1. Class II protection so that the user gets at least two layers of insulation from unintended damage to the equipment
2. Effective tackling of weather conditions such as a strong hail with resistance to speed up to 83 km/h so that your device is not damaged.
3. Excellent operating temperature range.
4. A 3.2 mm high transmission tempered glass that takes the overall performance of this module to a new high.
5. Optimized normal operating cell temperature so that there is no hindrance in an optimized throughput from the product.
Dienhathe.com catalogue epcos-capacitor_phasecapDien Ha The
Khoa Học - Kỹ Thuật & Giải Trí: http://phongvan.org
Tài Liệu Khoa Học Kỹ Thuật: http://tailieukythuat.info
Thiết bị Điện Công Nghiệp - Điện Hạ Thế: http://dienhathe.vn
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
Are you looking to streamline your workflows and boost your projects’ efficiency? Do you find yourself searching for ways to add flexibility and control over your FME workflows? If so, you’re in the right place.
Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part “Essentials of Automation” series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
Here’s what you’ll gain:
- Essentials of FME Parameters: Understand the pivotal role of parameters, including Reader/Writer, Transformer, User, and FME Flow categories. Discover how they are the key to unlocking automation and optimization within your workflows.
- Practical Applications in FME Form: Delve into key user parameter types including choice, connections, and file URLs. Allow users to control how a workflow runs, making your workflows more reusable. Learn to import values and deliver the best user experience for your workflows while enhancing accuracy.
- Optimization Strategies in FME Flow: Explore the creation and strategic deployment of parameters in FME Flow, including the use of deployment and geometry parameters, to maximize workflow efficiency.
- Pro Tips for Success: Gain insights on parameterizing connections and leveraging new features like Conditional Visibility for clarity and simplicity.
We’ll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Don’t miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
State of ICS and IoT Cyber Threat Landscape Report 2024 preview
Fan noise
1. »Energy efficiency«
in data processing?
Stefan Fassbinder
Deutsches Kupferinstitut
Am Bonneshof 5
D-40474 Düsseldorf
Tel.: +49 211 4796-323
Fax: +49 211 4796-310
sfassbinder@kupferinstitut.de
stf@eurocopper.org
www.kupferinstitut.de
2. The German Copper Institute, DKI, is
the central information and advisory
service dealing with all uses of copper
and copper alloys.
We offer our services to:
Commercial companies We can be contacted by:
The skilled trades post
Industry phone
R & D institutes fax
Universities e-mail
Artists and craftsmen internet
Students online database, or
Private individuals personally
4. This brand new PC power supply
unit
at 39.95€
promises to be 60% less noisy! 4
5. Well, 60% less noise
is at least a statement!
Though not really any more than that …
… as long as the question remains
unanswered:
Less than what?
6. This was not the way
Now what to do?
Loss heat can be
• either blown away
• or avoided!
So a different solution had to be found:
A fanless PSU (at 79.50€) works
totally noise free!
7. How is this reduction in
noise level achieved?
By improvement of passive cooling or by
reduction of cooling need, say losses?
By improvement of passive cooling and by
reduction of losses:
• Substantial enhancement of cooling
surface on the aluminium heat sinks
• Substantial enhancement of copper cross
sections in the windings of HF converters
8. But loss reduction holds
the greater share!
140W
Starting up a PC with
120W subsequent idle operation
P
100W
80W
60W
40W
Original PSU Antec True 380 SP
20W Fanless PSU FSP ZEN (2009)
0W
00:00min 05:00min t 10:00min
9. How to reduce losses? – Use more material!
Conventional Fanless
420 W 300 W
10. Still, the actual net power
consumption of a common PC
(built in 2005, 800 MHz) is:
• 50 W when idling (whereas writing a text
or composing an Excel table is idle for a
PC!),
• 100 W at peak processor demand
(gaming),
while the common power supply unit is very
much over-dimensioned!
11. Therefore the 300 W model
can quite conveniently
replace a 420 W unit.
PC power Antec FSP ZEN
True 380 with active
supply unit
SP with PFC,
comparison active fanless
Power rating 380W 300W
Weight 1995g 2223g
Material intensity 5.250g/W 7.410g/W
Factor 100% 141%
If this were not so the copper content would
have to be 41% higher rather than just 11%
12. Who else should have an
interest in this topic?
This is the reply to a request to the
colleagues from www.aluinfo.de sent
March 31, 2009:
I‘m still waiting…
13. Conventional PC power
unit, 420W
PC power supply LC4620, S/N: 7J090402
Rated power 420W
Input
30.0A 28.0A 14.0A Output
P 3.3V 5.0V 12.0V P P /P N η
4.4W 0.0A 0.0A 0.0A 0.0W 0.0% 0.0%
13.5W 0.0A 0.0A 0.0A 0.0W 0.0% 0.0%
64.0W 0.0A 0.0A 3.3A 40.1W 9.5% 62.6%
71.0W 17.5A 0.0A 0.0A 57.8W 13.8% 81.3%
109.0W 0.0A 0.0A 6.7A 80.2W 19.1% 73.5%
148.0W 0.0A 0.0A 9.4A 113.2W 26.9% 76.5%
161.0W 0.0A 25.0A 0.0A 125.0W 29.8% 77.6%
286.0W 0.0A 0.0A 18.8A 226.0W 53.8% 79.0%
307.0W 28.5A 24.0A 0.0A 214.1W 51.0% 69.7%
450.0W 28.5A 25.0A 7.0A 303.1W 72.2% 67.3%
740.0W PSU failure after ≈2s with <20% overload
14. Conventional PC power
unit, 300W
PC power supply T.I.P. 300 ATX
Rated power 218W
Input
14.0A 20.0A 6.0A Output
P 3.3V 5.0V 12.0V P P /P N η
0.0W 0.0A 0.0A 0.0A 0.0W 0.0% 0.0%
3.1W 0.0A 0.0A 0.0A 0.0W 0.0% 0.0%
21.4W 0.0A 0.0A 0.5A 6.1W 2.8% 28.6%
43.3W 0.0A 2.2A 0.9A 21.7W 9.9% 50.0%
56.8W 0.0A 0.0A 3.2A 38.9W 17.8% 68.5%
70.0W 0.0A 0.0A 4.3A 51.4W 23.5% 73.4%
97.0W 0.0A 5.0A 3.4A 66.1W 30.3% 68.1%
122.0W 0.0A 5.0A 5.2A 87.2W 40.0% 71.5%
148.0W 5.8A 5.0A 5.2A 106.0W 48.6% 71.6%
181.0W 5.8A 9.5A 5.2A 129.0W 59.1% 71.3%
226.0W 14.0A 9.5A 5.3A 157.4W 72.1% 69.7%
Shut-off – no more measurements possible
15. Conventional PC power
unit, 380W
PC power supply Antec True 380 SP
Rated power 380W
Input
28.0A 35.0A 18.0A Output
P 3.3V 5.0V 12.0V P P /P N η
0.0W 0.0A 0.0A 0.0A 0.0W 0.0% 0.0%
4.4W Fanless PC power
0.0A 0.0A 0.0A 0.0W 0.0% 0.0%
28.3W 2.2A 0.0A 0.0A 7.1W 1.9% 25.1%
64.8W unit, 300W
2.5A 0.0A 0.9A 19.1W 5.0% 29.4%
90.0W 2.5A 4.0A 0.9A 39.1W 10.3% 43.4%
109.0W
148.0W
Rated efficiency:
6.1A
6.1A
4.4A
4.6A
0.9A
3.3A
53.3W
82.6W
14.0%
21.7%
48.9%
55.8%
174.0W 5.6A 9.3A 3.3A 105.0W 27.6% 60.3%
282.0W 89% (at full load)
27.0A 9.3A 3.4A 176.2W 46.4% 62.5%
381.0W 27.0A 17.0A 6.7A 254.5W 67.0% 66.8%
463.0W 27.0A 17.0A 12.9A 328.9W 86.6% 71.0%
561.0W 27.0A 17.0A 19.0A 402.1W 105.8% 71.7%
16. How high is the »efficiency« of a PC?
Much higher than earlier, anyway!
Ancient XT: Latest model:
f = 4,7 MHz f = 4,7 GHz
Pel ≈ 40 W Pel <<400 W
This looks like an efficiency improvement by far
more than a factor of 100! With similar values for
• storage units,
• hard disks,
• graphic adaptors
you end up with improvement factors around 106!
17. Where will the journey
still take us?
A limit will be reached only when for one data bit
only more one electron needs to be moved.
So long, however, it‘s still 10,000 to 100,000
electrons that need to be employed for the smallest
occurring »elementary process« in data processing.
So the theoretical potential
• with miniaturisation,
• with acceleration of procedures,
• with reduction of energy demand
still lies somewhere near a factor of 104 … 105!
18. Hence the major part
of the job is done
• The first computer »Zuse Z1« had the
dimensions of an electrical locomotive…
• …along with its power consumption…
• …and this with the performance of a credit
card sized pocket calculator which you get
as a giveaway nowadays and which is
supplied from 2 cm² of solar cells or with a
button cell battery for no less than a year!
19. But progress with
processors is continuing:
PC built upgraded
2005 2011
Processor 2.6 GHz, 2*2.7 GHz,
RAM 512 MB, 4 GB,
400 MHz 1.6 GHz
Idle power 59 W 45 W
measured with the same fanless PSU
20. Only what‘s the use of it all
if you do anything you can
think of in order to e. g. implement all
available efficiency techniques in a
modern diesel engine and then add a
gearbox with 30% of losses?
Nobody would do that in a car –
in a PC it‘s the usual approach!
For the PSU is sort of a
»gearbox for electricity«.
21. The noiseless operation
comes for free!
Calculation of power consumption costs for a PC (built in 2005)
before and after replacing the conventional PSU with a fanless one
Conventional PSU with fan Fanless PSU
Output values P S Q LF cosφ P S Q LF cosφ
Full load 100h/a 135.5W 138.9VA 51.4var 0.975 0.977 113.0W 123.2VA 67.0var 0.890 0.940
No load 3000h/a 82.0W 87.1VA 29.3var 0.939 0.945 59.2W 70.5VA 38.1var 0.843 0.886
»off« 5660h/a 6.3W 24.5VA 23.6var 0.256 0.307 2.0W 24.1VA 24.0var 0.080 0.112
PSU 39.95 € 79.50 €
Price
Power 14.0c/kWh
Consumption 294.91kWh/a 200.36kWh/a
Electricity costs 41.29€/a 28.05€/a
Payback time 2.99a
The saved losses pay back for the price
premium within 3 years. The global savings
potential in 1 bn PCs would be 100 TWh/a!
Morals: I am a fan of the fanless design!
22. Then why do portable PCs provide
the same computing performance
with that much less electricity?
This notebook PC
is equipped with an integrated
55 Wh battery and an additional
95 Wh battery and runs for about
13 hours on these, corresponding to
12 W net DC power requirement!
23. Metering conditions:
• WLAN off,
• no UMTS device,
• no »action games«,
• moderate screen brightness.
Whereas it is remarkable with the laptop PC
• that the screen is already included
• and the whole PC uses less power …
24. … than a desktop flat screen uses
for itself alone!
25. So in the end there is one
question remaining open:
Why can this technique not be built
into a desktop PC?
Energy is still way too cheap.
The availability of electricity from the
accumulator is a reason to save
energy – the electricity price obviously
is not.