Reports & Materials

Technical Report

Measured Energy and Demand Impacts of Efficiency Tune-Ups and Thermostatic Expansion Replacements

The overall goal of this study was to assess the potential for cost-effective reductions in energy consumption and peak demand in existing small commercial and industrial cooling systems through efficiency tune-ups.

Technical Report

Measured Change in Multifamily Air Leakage and Airflow Due to Air Sealing and Ventilation Treatments

This paper summarizes the results from field studies to evaluate the effectiveness of air sealing and ventilation treatments to reduce environmental tobacco smoke transfer between units in six Minnesota apartment buildings.

Technical Report

MWX90: Minnesota Low Income Weatherization Procedure for the 1990's

In this manual, we define the procedures and guidelines for providing cost-effective weatherization in a heating-dominated climate.

Technical Report

Seasonal Efficiency and Off-Cycle Flue Loss Measurements of Two Boilers

In situ input/output measurements were performed on a hot water and a steam boiler, both of which are used in apartment building central heating systems.

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

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

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

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.