ZNE Project Archive

Projects of Spring 2016:

  • Financing the conversion of steam district heating to hot water at UC Davis

This project contrasted the estimated cost of steam-to-hot water conversion to the business-as-usual case, considering maintenance and energy use. The conversion includes implementation of heat recovery chillers for cogeneration of cooling and heating. Over a 30-year analysis period and based on justifiable assumptions used in the financial model, the conversion has an NPV of $21M and MIRR of 8%. Financing options include public-private joint venture, energy savings performance contracts, energy services agreements, student fees and revolving loan funds.

Poster: Steam-to-Hot Water Conversion, Financing



  • Building level analysis of steam heating vs hot water heating

This project evaluated the potential energy savings at the building level due to conversion from steam to a hot water heating system. Two buildings were selected: Student Community Center (SCC) containing space heating and domestic hot water (DHW) loads and Robbins Hall containing space heating, DHW and process (laboratory) loads. Calculations suggests savings of 20% and 48% over the baseline for Robbins Hall and SCC, respectively, which are primarily due to lower distribution losses and virtually negligible condensate loss.

Poster: Steam-to-Hot Water Conversion, Building Analysis



  • Commuting emissions of UC Davis Medical Center in Sacramento

This project evaluates the effectiveness of the Green Commuting Program on commuting emissions reductions implemented at the UCD Sacramento Medical Center. The Program promotes commuting by ZipCar, campus shuttles, bike, walk and vehicle pooling. Fuel economy of personal transport was obtained from a sample of 200 vehicles at the UCDMC parking lots. MapQuest data was used to obtain driving distances from the UCDMC to the zip codes of residences. Total communitng emissions reductions due to the program was estimated at 2.5% of the baseline of 27 Mkg CO2. Additional recommendations for further actions includes increasing the cost of personal transport parking and increasing bike posts and the number of shuttle stops.

Poster: UCD Medical Center Commuting Emissions



  • Comparative performance of radiant versus fan coil cooling systems at Sproul Hall

This project evaluates the occupant comfort and energy use of radiant cooling and heating systems over convention fan coils in Sproul Hall at UC Davis. Monitored equipment data from eight rooms (half with radiant and half with fan coils) and surveys from occupants were collected and analyzed. The radiant system was found to provide a comparable level of comfort to the fan coils. Further work includes collection of humidity and equipment power draw data in order to provide better insight into energy uses of the each system.

Poster: Sproul Hall Radiant Heating and Cooling



  • Modeling campus sustainability alternatives using EnergyPRO

This project evaluated three renewable energy alternatives for UC Davis utilizing the modeling program EnergyPRO. Alternatives includes 1) displacing heating supply by natural gas boilers with solar thermal, 2) displacing heating and cooling supply by natural gas boilers and electric chillers with heat recovery chillers for thermal cogeneration, 3) displacing electricity use using a biomass power plant. Results suggest that solar thermal should be considered in the near future since it can reduce natural gas use for heating by 54-89%.

Poster: Renewable Alternatives at UCD



  • Financing strategies for University of California carbon neutrality

This project aimed at creating a tool and associated strategies for financing the UC Davis climate action plan projects with a focus towards building a sustainable green revolving fund. Funding sources includes endowments, donations and grants, utility rebates, capital budgets, cost savings from efficiency projects and student fees. Recommended action includes the establishment of a green revolving fund with staff, guidelines and approval process for projects.

Poster: Financing Strategies for Climate Projects