David Denkenberger

David Denkenberger

Technical Specialist at Ecova

Location
Durango, Colorado (Albuquerque, New Mexico Area)
Industry
Renewables & Environment

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David Denkenberger's Overview

Current
  • Technical specialist at Ecova
Past
Education
Connections

163 connections

David Denkenberger's Summary

Energy generalist (engineering and economics) with work in renewable energy, energy storage, and energy efficiency.

Specialties: Global catastrophic risks, existential risks, heat exchangers, buildings, solar energy, wind energy, compressed air energy storage, vehicle to grid, thermal storage, geoengineering (aka solar radiation management: reducing the amount of sunlight that is absorbed by the earth), inventing, computational fluid dynamics, urban planning

David Denkenberger's Experience

Technical specialist

Ecova

Privately Held; 1001-5000 employees; Oil & Energy industry

October 2010Present (4 years) Durango, CO

Technical and policy work on clothes dryers, battery chargers and lighting

Educational Institution; 5001-10,000 employees; Higher Education industry

August 2005August 2010 (5 years 1 month)

Program in building energy efficiency and renewable energy, dissertation on a patent pending heat exchanger with general applicability

Master's student

Princeton University

Educational Institution; 5001-10,000 employees; Higher Education industry

August 2002July 2005 (3 years)

Major in fluid mechanics, thesis on optimizing wind turbines

Undergraduate

Penn State University

Educational Institution; 10,001+ employees; Higher Education industry

August 1997May 2002 (4 years 10 months)

Major in engineering science, thesis on optimizing solar collectors

David Denkenberger's Volunteer Experience & Causes

  • Volunteer Experience

    • Research associate

      Global Catastrophic Risk Institute
      August 2013 present (1 year 2 months)

David Denkenberger's Projects

  • Analysis of Potential Energy Savings from Heat Pump Clothes Dryers in North America

    • March 2013 to Present
    Team Members: David Denkenberger, Christopher Wold, Chris Calwell, Nathan Beck, Brendan Trimboli, Debbie Driscoll

    CLASP and Ecova conducted a study that compares the energy consumption of currently available European heat pump dryers to that of conventional North American electric dryers. It also assesses how these two technologies perform when drying test loads that more closely represent real-world clothing.

    Key findings from the report include the following:
    ◾European heat pump clothes dryers use only 40-50% as much energy as North American conventional dryers to dry the same amount of laundry;
    ◾North American conventional dryers have a peak power consumption roughly five times as high as that of European heat pump dryers;
    ◾European heat pump dryers took twice as long to dry a load of laundry as North American conventional dryers; and
    ◾Drying time and energy consumption increased for all dryers when drying test loads that more closely resemble real-world clothing.


    Based on these findings, CLASP and Ecova drew the following conclusions:
    ◾Heat pump clothes dryers are a mature technology with substantial energy saving potential;
    ◾A heat pump clothes dryer designed for North America could still offer significant energy savings, even if it were designed to sacrifice some energy efficiency in order to reduce drying time; and
    ◾Further modifications to the new U.S. Department of Energy test procedure, including the use of a test load that more closely represents real world clothing, are needed to more accurately predict actual clothes dryer energy consumption.


    This report was a collaboration between CLASP, Ecova, the Vermont Energy Investment Corporation (VEIC), and Grasteu Associates as a part of the Super Efficient Dryer Initiative.

David Denkenberger's Publications

  • Baseload wind energy: Modeling the competition between gas turbines and compressed air energy storage for supplemental generation

    • Energy Policy
    • March 2007
    Authors: David Denkenberger, Samir Succar, Jeffery Greenblatt, Robert Socolow, Robert H. Williams

    The economic viability of producing baseload wind energy was explored using a cost-optimization model to simulate two competing systems: wind energy supplemented by simple- and combined cycle natural gas turbines (“wind+gas”), and wind energy supplemented by compressed air energy storage (“wind+CAES”). Pure combined cycle natural gas turbines (“gas”) were used as a proxy for conventional baseload generation. Long-distance electric transmission was integral to the analysis. Given the future uncertainty in both natural gas price and greenhouse gas (GHG) emissions price, we introduced an effective fuel price, pNGeff, being the sum of the real natural gas price and the GHG price. Under the assumption of pNGeff=$5/GJ (lower heating value), 650 W/m2 wind resource, 750 km transmission line, and a fixed 90% capacity factor, wind+CAES was the most expensive system at ¢6.0/kWh, and did not break even with the next most expensive wind+gas system until pNGeff=$9.0/GJ. However, under real market conditions, the system with the least dispatch cost (short-run marginal cost) is dispatched first, attaining the highest capacity factor and diminishing the capacity factors of competitors, raising their total cost. We estimate that the wind+CAES system, with a greenhouse gas (GHG) emission rate that is one-fourth of that for natural gas combined cycle plants and about one-tenth of that for pulverized coal plants, has the lowest dispatch cost of the alternatives considered (lower even than for coal power plants) above a GHG emissions price of $35/tCequiv., with good prospects for realizing a higher capacity factor and a lower total cost of energy than all the competing technologies over a wide range of effective fuel costs. This ability to compete in economic dispatch greatly boosts the market penetration potential of wind energy and suggests a substantial growth opportunity for natural gas in providing baseload power via wind+CAES, even at high natural gas prices.

  • Effect of air flow on “V” type solar still with cotton gauze cooling

    • Desalination
    • 2014
    Authors: David Denkenberger, P.U. Suneesh, R. Jayaprakash, T. Arunkumar
  • Battery Charger Systems: The Next Cross-cutting Policy Opportunity to Address Plug Load Energy Use

    • 7th International Conference on Energy Efficiency in Domestic Appliances and Lighting (EEDAL’13)
    • 2013
    Authors: David Denkenberger, S. Foster Porter
  • The Augmentation of Distillate Yield by Using Concentrator Coupled Solar Still with Phase Change Material

    • Desalination
    • 2013
    Authors: T. Arunkumar, David Denkenberger, Amimul Ahsan;, R. Jayaprakash
  • Effect of Water and Air Flow on Concentric Tubular Solar Water Desalting System

    • Applied Energy
    • 2013
    Authors: T. Arunkumar, R. Jayaprakash, Amimul Ahsan, David Denkenberger, M.S. Okundamiya
  • What Lurks Beneath: Energy Savings Opportunities from Better Testing and Technologies in Residential Clothes Dryers

    • Proceedings of the American Council for an Energy-Efficient Economy: Summer Study
    • August 2012
    Authors: David Denkenberger, Serena Mau, LEED GA, C. Calwell, E. Wanless, Brendan Trimboli
  • Capturing Plug Load Energy Savings with a Wide Net: Horizontal Policy Lessons Learned and Future Opportunities

    • Proceedings of the American Council for an Energy-Efficient Economy: Summer Study
    • August 2012
  • An Experimental Study on a Hemispherical Solar Still

    • Desalination
    • 2012
    Authors: T. Arunkumar, R. Jayaprakash, David Denkenberger
  • Optimization of Specific Rating for Wind Turbine Arrays Coupled to Compressed Air Energy Storage

    • Applied Energy
    • 2012
    Authors: Samir Succar, David Denkenberger, R. H. Williams
  • Expanded Microchannel Heat Exchanger: Design, Fabrication, and Preliminary Experimental Test

    • Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
    • 2012
    Authors: David Denkenberger, M. J. Brandemuehl, Joshua Pearce, J. Zhai
  • Compound Parabolic Concentrators for Solar Water Heat Pasteurization: Numerical Simulation

    • Proceedings of the Solar Cookers International Conference
    • July 2006
  • Numerical Simulation of the Direct Application of Compound Parabolic Concentrators to a Single Effect Basin Solar Still

    • Proceedings of the Solar Cookers International Conference
    • July 2006
  • The Influence of Large-Scale Wind-Power on Global Climate

    • Proceedings of the National Academy of Sciences
    • 2004
    Authors: D.W. Keith, J.F. DeCarolis, David Denkenberger
  • DC Distribution Market, Benefits, and Opportunities Residential and Commercial Buildings

    • Pacific Gas & Electric
    • October 2012

David Denkenberger's Skills & Expertise

  1. Solar
  2. Wind Energy
  3. CFD
  4. Heat Exchangers
  5. Invention
  6. Solar Energy
  7. Wind
  8. Renewable Energy
  9. Engineering
  10. Green Building

David Denkenberger's Education

University of Colorado Boulder

PhD, Civil Engineering (Building Systems Program)

20052010

Building Systems Program Seminar Coordinator, American Society of Heating, Refrigerating, and Air Conditioning Engineers Graduate Research Fellowship

Activities and Societies: American Society of Heating, Refrigerating, and Air Conditioning Engineers, Advisor to Hydrogen Fuel Cell Vehicle Middle School Competition

Princeton University

MSE, Mechanical and Aerospace Engineering

20022005

National Science Foundation Graduate Research Fellowship, thesis on optimizing wind turbines, published at Electric Power Conference

Penn State University

BS, Engineering Science

19972002

Minor in Economics, National Merit Scholarship, Goldwater Scholarship, Distinguished Alumnus, Honors College, Student Marshall of Engineering Science, thesis on optimizing reflectors for solar devices, published in National Conference on Undergraduate Research

Activities and Societies: Intramural tennis, Eco Action, Society of Engineering Science, Tau Beta Pi Engineering Honors Society, Unitarian Universalist Student Organization (president)

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