This article was downloaded by: [Istanbul Universitesi Kutuphane ve Dok]On: 20 December 2014, At: 03:48Publisher: Taylor & FrancisInforma Ltd Registered in England and Wales Registered Number: 1072954Registered office: Mortimer House, 37-41 Mortimer Street, London W1T 3JH,UK

Cogeneration & DistributedGeneration JournalPublication details, including instructions forauthors and subscription information:http://www.tandfonline.com/loi/ucgn20

Transition IssueJorge B. Wong aa Simpsonville, Chepén, SC and PerúPublished online: 05 Oct 2010.

To cite this article: Jorge B. Wong (2010) Transition Issue, Cogeneration & DistributedGeneration Journal, 25:4, 5-7, DOI: 10.1080/15453669.2010.10132360

To link to this article: http://dx.doi.org/10.1080/15453669.2010.10132360

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Vol. 25, No. 4 2010 5

From the Editor

Transition Issue

NAME CHANGE. NOT QUITE YET.

This publication will change name starting next issue, Volume 26, No. 1 (Winter 2011) to: Distributed Generation and Alternative Energy Journal.

DISTRIBUTED GENERATION—THE ELECTRICAL GRID SIDE.

In the previous issue we introduced a couple of methods to quan-tify the electrical power losses incurred by electrical distribution systems. Sivkumar Mishra et. al. [1] showed us how active losses can be quanti-fied in simple radial distribution systems. Then M.S. Krishnamurthy and P.V. Koppal [2] explained how the performance of more complex distribution systems can be enhanced with multiple DG sources. Both of these schemes allow us to quantify the benefits (of I2R loss reduction) introduced by Distributed Generation or DG plants. We shall continue exploring all DG aspects with strong emphasis on the distributed gen-eration of combined heat and power. We envision future articles that deal with more systemic schemes that integrate voltage stability, distri-bution loss avoidance, reliability and safety to help improve the quality of communication and negotiation information between power utilities and distributed generators. In this issue, Mohanty and Modi develop an approach to optimally size and locate DG plants in a distribution network.

BACK TO BASICS

How can basic operating and maintenance (O&M) improvements and traditional energy efficiency retrofits can set the stage for more complex and profitable energy efficiency measures? Thompson and Yeld-

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6 Cogeneration and Distributed Generation Journal

hall [3] told us in their last article a facility can “buy down the cost of renewable energy with efficiency.” In fact, this is a fundamental energy management principle which states we should start with no-cost or low-cost O&M measures, and then easy-to-implement retrofits to generate a never-ending cycle of energy efficiency and profit re-investment. This is not different than growing a well managed and diversified investment portfolio. With the difference that energy management is many orders of magnitude more understandable, transparent and less volatile than financial derivatives (of the toxic kind) and subprime mortgages.Next, in this issue, Nsofor and Vijay set the stage for cogeneration by developing an approach to assess the heating load of a commercial building by using BIN weather data. Then, they propose a more cost effective gas-fired boiler. However, the heating load data obtained from the study are suitable to explore combined heat and power technologies with integrated heating and cooling options for the facility.

COGENERATION OR CHP

In the Summer 2010 issue, professors Lozano and Ramos [4] shared a methodology for the integrated thermodynamic and economic or thermo-economics analysis for simple cogeneration systems in buildings. As a sequel, in this issue they further their methodology by using Mixed Linear-Integer programming for the optimal selection of building cogen-eration systems. The article by Lozano and Ramos includes the authors’ complete bio, which didn’t fit in the previous issue due to space reasons. Also, in the previous issue, Pais and Leo [5] showed combined heat and power application of high temperature fuel cells. Current research is underway to improve the harnessing or tapping into alternative energy to find innovative ways to apply it in DG or cogeneration. Thus, see in this edition Jeffrey Stringfield’s article on how US government facilities are deploying CHP and renewable energy projects. Next, Kozman et al. survey the renewed interest in cogeneration at university campuses across the US.

UNITS AND NOTATION In the US and Canada, when we say power, we mean electrical power. This is also so in many other countries, particularly in the UK and

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Vol. 25, No. 4 2010 7

Western Europe. Thus, in cogeneration, the Heat-to-Power ratio (H/P) is ubiquitous and we wouldn’t have a problem stating it as MMBTU/hr/MW, or as MWe/MWq. (e for electricity and q for heat quantity). However, several of our international readers and contributors have stated that we need to explain whether we are talking mechanical (shaft) power (kWm), thermal power or heat flow (kWq) or electrical power (kWe). Furthermore, flowing primary energy, be it coal or solar radiation, can also be stated in terms of in kWp or MWp (p for primary or source energy). In this Journal, Prof. Jose Ramos, our associate editor in Europe, and I will clarify, whenever it is needed, which energy flows are we referring to, with the relevant physical units: SI, US or both.

Errata The Summer 2010 issue (Vol. 25, No.3) incorrectly states Mr. Steven A. Parker as the Editor-in-Chief, on the front cover. The present editors are Jorge B. Wong and Jose Ramos-Saravia as shown in pages 1 and 2. We apologize for the mistake. Please keep your articles, letter, questions and comments coming.

Sincerely,

Jorge B. WongSimpsonville, SC and Chepén, Perú

References[1] Sivkumar, M. et. al., Active Loss Allocation Schemes in Radial Distribution Systems,

Cogeneration & Distributed Generation Journal, Vol. 25, No. 3, pp. 26-43.[2] Krishnamurthy, M.S. and Koppal, P.V., Performance Enhancement of Electrical

Distribution Systems with Multiple Distributed Generation Sources; Cogeneration & Distributed Generation Journal, Vol. 25, No. 3., pp. 50-62.

[3] Thomson, P.C. and Yealdhall, VE., Buying Down the Cost of Renewable Energy with Efficiency, Cogeneration & Distributed Generation Journal, Vol. 25, No. 3., pp. 44-49.

[4] Lozano, M.A. and Ramos J, Thermodynamic and Economic Analysis for Simple Co-generation Systems, Cogeneration & Distributed Generation Journal, Vol. 25, No. 3., pp. 63-80.

[5] Pais, C. and Leo, A, Combined Heat and Power Applications of High Temperature Fuel Cells, Cogeneration & Distributed Generation Journal, Vol. 25, No. 3., pp. 7-25.

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