Reports & Materials

Technical Report

Field Validation of Diagnostic Techniques for Estimating Boiler Part-Load Efficiency

A theoretical basis for various short-term boiler diagnostic test techniques--heat-up/cool-down; stop-loss; and time-to-make-steam--is presented along with the results of applying, these techniques in situ to three boilers to estimate the off-cycle energy loss rates and part-load efficiencies.

Technical Report

Analysis of Error in Using Simplified Models to Approximate the Heating or Cooling Output of Fan Coil Units for Energy Cost Allocation Purposes

This paper assesses how well various simple linear models approximate the true relative heating or cooling output of fan coil units under various ranges of application conditions. It further assesses the improvement possible in using non-linear models that follow the known form of the heat transfer relationship.

Technical Report

Field Measurements of Off-Cycle Losses and Seasonal Efficiency for Major Classes of Multifamily Boilers

For multifamily buildings, space heating improvements offer one of the best potentials for saving energy. However, the energy savings and cost-effectiveness of space heating retrofits and boiler replacements depend critically on the efficiency of the existing boiler.

Technical Report

Improving Cooling Equipment for the Small Commercial Buildings Market

This report examines the importance of various types and sizes of cooling equipment in the small commercial market, the availability and incremental cost of efficient commercial cooling equipment, and recent developments in codes, standards and utility demand side management programs for commercial cooling.

Technical Report

Supermarket Refrigeration Market Assessment

The overall goal of this project was to assist Northern States Power Company in updating and expanding their C&I refrigeration rebate program by identifying technologies which have good potential to reduce demand and/or energy use, but are not currently widely implemented.

Technical Report

Transferring Effective Multifamily Energy Programs to Communities in Greater Minnesota

The purpose of the Multifamily Technology Transfer Project was to ensure implementation of proven energy efficiency improvements in multifamily buildings in greater Minnesota.

Technical Report

Lighting Efficiency in New Small Commercial Construction in Minnesota

The study looked at the number of buildings that actually complied with the "1989" and "1993" Code of Federal Regulations requirements, and the incremental costs and savings associated with installing state-of-the-art lighting equipment.

Technical Report

An Evaluation of Energy Program Needs For Minnesota Non Profit Organizations

The McKnight Foundation retained the Center for Energy and the Urban Environment (CEUE) to survey their recent grant recipients about their level of familiarity and concern regarding energy efficiency issues and about any efficiency measures or programs they had already implemented or were considering implementing.

Technical Report

Measured Savings from Integral Flue Dampers and Thermal Vent Dampers on Domestic Hot Water Heaters in Multifamily Buildings

This research was undertaken to further investigate the benefits of using an integral flue damper versus a thermal vent damper on commercial tank-type water heaters.

Technical Report

Measured Savings from High Efficiency Replacement Tank-Type Domestic Hot Water Heaters in Multifamily Buildings

In order to measure savings and assess performance of the "best available technology" for this application, high efficiency condensing tank-type water heaters were installed in parallel with existing conventional tank-type DHW heaters in two apartment buildings.