We study installations of emerging technologies to look for missed opportunities, verify savings and establish best practices. Closing the information gap boosts confidence in the expected performance of new technologies and approaches, increases savings and expands market penetration.

How can future versions of the ASHRAE 90.1 energy standard drive more energy cost savings? No studies have been conducted that determine the energy cost savings for buildings that comply with ASHRAE’s standard 90.1-2010 vs. the 2004 version based on utility bill data and building surveys. Slipstream will address this gap by documenting the energy performance of two building types. Then we’ll explore how to improve future versions of the standard to drive energy cost savings. More
Refrigeration is a massive energy consumer in commercial and industrial buildings. According to the International Institute of Refrigeration's Role of Refrigeration in the Global Economy, it consumes around 17 percent of all electricity in the commercial sector alone. Rising demand and a warming climate mean almost certain expansion for refrigeration. This also means tremendous opportunity for energy savings; effort has gone into implementing many measures to reduce energy use in refrigeration across the country. More
Reduce the cost of implementing geothermal heat pump systems on your building projects by going hybrid. A hybrid geothermal heat pump system can lower your costs by reducing the peak capacity of your ground loop and allowing you to install a smaller, less expensive ground heat exchanger. HyGCHP is a software module that can help you analyze this option! More
Application of air source variable refrigerant flow in cold climates Variable refrigerant flow (VRF) systems use variable speed, split heat pumps to provide space heating and cooling to a building's conditioned areas. Air source VRF systems perform best in moderate climates, as they typically lose capacity and efficiency at low ambient temperatures—or moderately low wet bulb temperatures where defrost is required—and may be supplemented by an additional heat source. More
Task tuning can lead to energy savings without loss of occupant comfort. Task tuning is one form of lighting control that can be used in commercial buildings to save energy. It involves dimming lights in a space so that the average illuminance at the working plane is appropriate for the type of use in that space. More
Energy savings and lessons learned from observed, practical approaches to demand control ventilation Demand control ventilation (DCV) systems use sensors — generally either CO2 or occupancy sensors — to estimate the actual number of people in an area and supply only as much ventilation air as is needed at a given time. DCV has the potential to save a substantial portion of building energy use in extreme climates like the northern Midwest. More
RTUs are used in more than one third of U.S. commercial buildings, the highest of any cooling equipment type. Why? They are reliable and have a low capital cost, as well as established service and distribution networks. There is anecdotal evidence, however, that these systems operate inefficiently. To validate or refute this evidence, we conducted a multi-level field study sponsored by Minnesota Department of Commerce, Division of Energy Resources. Resources: More
What is the relationship between perceived comfort level and actual physiological data? Slipstream is excited to participate in a research study to help answer this question. More
Plug load energy—from computers to copiers to water coolers—represents a relatively untapped energy savings resource in commercial buildings. And unlike most types of loads like lighting, heating, and other end uses, plug load energy use is increasing nationwide. The energy efficiency industry needs to do more to both identify and quantify strategies for reducing plug load. More