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Ongoing Commissioning of Economizers in a Data Center

A maintenance protocol/program to verify performance and make corrections to the air or water side economizers in a data center

TAG Technical Score: 3.28

Energy Savings: 10%

Regional Potential: 0.18 MWh/year

ID: 486

Natural Ventilation for Mixed-Mode Conditioning

Utilizing natural ventilation (driven by wind and stack effect rather than fans) for nighttime precooling of a building, preferably one with extensive exposed masonry structure in a climate with significant daily temperature swings

TAG Technical Score: 3.18

Energy Savings: 20%

Regional Potential: 0.22 MWh/year

ID: 541

Direct Server Cabinet Cooling

A special cabinet that encases servers so only the servers are cooled, not the entire server room.

TAG Technical Score: 2.62

Energy Savings: 15%

Regional Potential: 0.53 MWh/year

ID: 68

Indirect-Direct Stand Alone Evaporative Cooler

A device that employs both indirect and direct evaporative cooling instead of using the vapor-compression/refrigeration cycle. This maximizes evaporative cooling while increasing humidity less than direct evaporative cooling alone.

TAG Technical Score: 2.4

Energy Savings: 30%

Regional Potential: 0.37 MWh/year

ID: 23

Active Chilled Beam Heating and Cooling

A heating and cooling system that draws room air past hot or cold water heat exchangers and provides conditioned air and necessary ventilation air into the space.

TAG Technical Score:

Energy Savings: 20%

Regional Potential: 0.44 MWh/year

ID: 316

Add motorized dampers to envelope duct penetrations

Motorized dampers that close automatically when an HVAC fan is turned off, saving energy by reducing infiltration.

TAG Technical Score:

Energy Savings: 10%

Regional Potential: 0.64 MWh/year

ID: 426

Advanced Design Rooftop Unit

These retrofit units offer improved energy performance over typical existing "commercial" rooftop units by enhancing the performance of individual components and configurations, including fans, coils, filters, dampers, compressors, condensers, controls, and airflow path.

TAG Technical Score:

Energy Savings: 60%

Regional Potential: 1.93 MWh/year

ID: 246

Advanced Rooftop Unit Controls (ARC) Retrofit

Controllers to retrofit existing rooftop units to optimize performance by providing remote energy monitoring and control as well as variable speed drives, demand-controlled ventilation, and other features.

TAG Technical Score:

Energy Savings: 45%

Regional Potential: 2.14 MWh/year

ID: 338

Aerosol-Based Duct Sealing for Residential and Commercial Buildings

An aerosol sealant is blown through ducts, plugging leaky ducts from inside the duct system without having to locate or access holes. This technology can be applied to both residential and commercial duct systems.

TAG Technical Score:

Energy Savings: 20%

Regional Potential: 1.21 MWh/year

ID: 178

Air Flow Management for Data Centers

A collection of techniques and strategies that direct supply air to the servers at a rate needed for server performance while minimizing airflow energy costs.

TAG Technical Score:

Energy Savings: 30%

Regional Potential: 1.06 MWh/year

ID: 376

Air-Side Economizer for Data Centers

Using up to 100% outside air cooling capability in a data center to provide "free" cooling in an application where outside air would otherwise be provided only to satisfy minimum ventilation requirements.

TAG Technical Score:

Energy Savings: 25%

Regional Potential: 0.88 MWh/year

ID: 119

Circulating Hot and Chilled Water Pumps with Variable Speed ECPM Motors

Speed-controlled circulating pumps for heating, cooling, and domestic hot water systems using electronically commutated permanent magnet (ECPM) motors.

TAG Technical Score:

Energy Savings: 75%

Regional Potential: 0.01 MWh/year

ID: 291

Cold Climate Ductless Heat Pump for Residential Application

A variable speed ductless air source heat pump (see ID #300) specifically designed to operate at capacity without supplemental heat down to very low temperatures -- as low as -25F.

TAG Technical Score:

Energy Savings: 50%

Regional Potential: 1.60 MWh/year

ID: 199

Dedicated Outside Air System (DOAS) for VAV HVAC systems

An outside air ventilation system that is separate from the central air handling and distribution system.

TAG Technical Score:

Energy Savings: 10%

ID: 248

Demand-Controlled Ventilation

Ventilation in commercial buildings controlled by occupancy sensors – usually CO2 monitors – to provide just the required amount of outside air and to avoid over- or under-ventilating a space.

TAG Technical Score:

Energy Savings: 10%

Regional Potential: 1.95 MWh/year

ID: 166

Demand-Controlled Ventilation for Commercial Kitchens

A system for commercial kitchen exhaust fans that uses smoke and heat sensors to control the exhaust hood airflow and make-up air volume based on cooking activities.

TAG Technical Score:

Energy Savings: 57%

Regional Potential: 0.68 MWh/year

ID: 155

Desiccant Dehumidifiers for Grocery & Cold Storage

A solid desiccant dehumidifier integrated with the HVAC system that can maintain the humidity level inside a building in the range of 30% to 40%.

TAG Technical Score:

Energy Savings: 25%

Regional Potential: 0.26 MWh/year

ID: 313

Desiccant-Enhanced Hybrid Evaporative Air Pre-Cooler

Combining the basic indirect evaporative cooler with a desiccant pre-stage allows for evaporative coolers to operate efficiently under higher-humidity conditions than would be normally possible.

TAG Technical Score:

Energy Savings: 25%

Regional Potential: 0.20 MWh/year

ID: 49

Displacement Ventilation

An air distribution system which supplies low velocity air, typically at floor level. Supplied air rises slowly and is extracted from the ceiling, as opposed to intentionally mixing the air.

TAG Technical Score:

Energy Savings: 25%

Regional Potential: 0.24 MWh/year

ID: 18

Ducted Variable-Speed Split System Heat Pump

A ducted heat pump leveraging the successful inverter-driven technology found in ductless heat pumps.

TAG Technical Score:

Energy Savings: 39%

Regional Potential: 2.60 MWh/year

ID: 332

Ductless Mini-Split Heat Pump for Manufactured Homes

Ductless Mini-Split Heat Pumps with Variable Speed Compressors, but this application is designed specifically for use in multifamily residential applications.

TAG Technical Score:

Energy Savings: 33%

Regional Potential: 1.11 MWh/year

ID: 301

Ductless Mini-Split Heat Pump for Multi-Family Housing

Mini-Split Heat Pumps with Variable Speed Compressors, but this application is designed specifically for use in multi-family homes.

TAG Technical Score:

Energy Savings: 41%

Regional Potential: 0.58 MWh/year

ID: 302

Ductless Mini-Split Heat Pump for Small Commercial Applications

Ductless mini-split heat pump employing variable refrigerant flow technology without simultaneous heating and cooling, and up to eight zones to be used for small commercial applications. Features of this technology include: 1. A single outdoor unit that provides non-simul...

TAG Technical Score:

Energy Savings: 38%

Regional Potential: 0.24 MWh/year

ID: 276

Ductless Mini-Split Heat Pumps for Residential Applications

Ductless split systems with non-inverter driven compressors have been available in the U.S. for decades. Within the last few years, the market has begun to shift to using inverter-driven compressors. Non-inverter driven compressors are still used however, typically due t...

TAG Technical Score:

Energy Savings: 32%

Regional Potential: 3.04 MWh/year

ID: 300

ECPM Motors for Single-phase HVAC Fan Applications

High efficiency electronically commutated permanent magnet (ECPM) motors with inherent variable speed capability that are ideal retrofits for package terminal air conditioners, room air conditioners, unitary condenser fans and blowers, and exhaust fan applications.

TAG Technical Score:

Energy Savings: 33%

Regional Potential: 2.44 MWh/year

ID: 101

Efficient Laboratory Hoods

A package of lab hood efficiency measures including heat recovery and automatic sash positioning.

TAG Technical Score:

Energy Savings: 30%

Regional Potential: 0.42 MWh/year

ID: 185

Energy Recovery Ventilator with Heat and Membrane Humidity Exchangers for Commercial Application

An air-to-air heat exchanger that transfers both sensible and latent heat between the exhaust air stream and the fresh air stream using one of a number of membrane-based technologies.

TAG Technical Score:

Energy Savings: 65%

Regional Potential: 4.88 MWh/year

ID: 461

FANWALL Technology

An air handler made up of an array of smaller fans that replaces a single large fan.

TAG Technical Score:

Energy Savings: 5%

Regional Potential: 0.01 MWh/year

ID: 177

Heat Recovery Ventilator for Commercial Applications

A heat exchanger to heat or cool incoming fresh or outside air, capturing about 50% to 70% of the sensible heat from the exhaust air that would otherwise be discharged into the atmosphere.

TAG Technical Score:

Energy Savings: 30%

Regional Potential: 2.26 MWh/year

ID: 20

High-Volume, Low-Speed Fans

A high-volume, low-speed (HVLS) fan up to 24 feet in diameter, capable of displacing many smaller constant speed fans.

TAG Technical Score:

Energy Savings: 96%

Regional Potential: 0.02 MWh/year

ID: 620

HVAC Embedded Fault Detection and Diagnostics

Smart equipment for commercial and residential HVAC that recognizes when it is failing or has failed, or when environmental conditions have drifted outside its optimum capability range, and can communicate that to personnel.

TAG Technical Score:

Energy Savings: 13%

Regional Potential: 0.98 MWh/year

ID: 163

Hybrid Direct Expansion With Evaporative Pre-Cooling

Hybrid cooling that couples conventional high-efficiency mechanical cooling with one or more evaporative cooling techniques to minimize compressor electricity demand and consumption.

TAG Technical Score:

Energy Savings: 25%

Regional Potential: 0.59 MWh/year

ID: 59

Install Ducts in Conditioned Space

Designing buildings with ducts in conditioned space to eliminate the heat loss associated with duct leakage.

TAG Technical Score:

Energy Savings: 10%

Regional Potential: 0.05 MWh/year

ID: 154

Liquid Submersion Cooling for Data Centers

A method of cooling data center servers by submerging them in dielectric fluid, resulting in reduced energy use, peak demand, and infrastructure requirements compared with air cooling or liquid pipe-to-point cooling.

TAG Technical Score:

Energy Savings: 40%

Regional Potential: 1.33 MWh/year

ID: 452

Low Pressure Drop Piping System

Piping system designed for low pressure drop saves pump energy.

TAG Technical Score:

Energy Savings: 33%

ID: 257

Low Temp Supply Air to Reduce Volumetric Flow Rate

Lower design supply temperatures for cooling reduce the air volume required to meet loads and reduces fan energy, duct sizing, and potentially first-installed cost.

TAG Technical Score:

Energy Savings: 2%

Regional Potential: 0.02 MWh/year

ID: 203

Low Temperature Variable Refrigerant Flow (VRF) with or without Simultaneous Heating and Cooling for Large Commercial Applications

Variable refrigerant flow systems for large commercial buildings, similar to ID #126, but designed specifically for climates with frequent low temperatures so that auxiliary heat is not needed, or is needed only at very low temperatures.

TAG Technical Score:

Energy Savings: 25%

Regional Potential: 0.33 MWh/year

ID: 311

Low-Lift Cooling Technology Option Set

A set of five technologies based on low-lift vapor compression cooling equipment assembled by Pacific Northwest National Laboratory (PNNL) under a single name.

TAG Technical Score:

Energy Savings: 42%

Regional Potential: 0.47 MWh/year

ID: 184

Mechanical Nighttime Ventilation Cooling

A system that uses an air-side economizer to automatically ventilate a building at night to cool the building's thermal mass and reduce the need for compressor-based cooling the following day.

TAG Technical Score:

Energy Savings: 10%

Regional Potential: 0.76 MWh/year

ID: 102

Pressure-Independent Flow Control Valves

Replacements for conventional two-way valves used to control the flow of heated or chilled water through coils.

TAG Technical Score:

Energy Savings: 5%

Regional Potential: 0.20 MWh/year

ID: 269

Radiant Heating and Cooling with Dedicated Outside Air System (DOAS)

Provides space conditioning by circulating heated or cooled water through radiant ceiling panels, floor, or walls while required ventilation air is provided by a dedicated air handling unit.

TAG Technical Score:

Energy Savings: 20%

Regional Potential: 0.51 MWh/year

ID: 74

Residential Water-Cooled Condenser

Residential sized water cooled condenser air conditioning technology has been available for several years. Laboratory and field testing of several generations documented the efficiency potential of this technology. Water Cooled condenser technology offers significant elec...

TAG Technical Score:

Energy Savings: 30%

Regional Potential: 0.32 MWh/year

ID: 88

Smart Thermostat for Residential HVAC Control

A smart thermostat provides advanced energy management features. Capabilities include occupancy sensing, remote monitoring, data analysis, automation, system optimization, and reporting to optimize control of home space conditioning enabled by advanced technology for sen...

TAG Technical Score:

Energy Savings: 12%

Regional Potential: 0.48 MWh/year

ID: 240

Thermoelectric Refrigeration for Cabinet Cooling

An air conditioner used to cool electronic equipment that works by sending current through two dissimilar conductors and offers superior efficiency over conventional refrigeration systems.

TAG Technical Score:

Energy Savings: 50%

ID: 445

Ultrasonic Humidification for Commercial Buildings

Ultrasonic humidifiers add moisture to the air without heating the water by injecting ultrasonic pulses into the water, vibrating water molecules at high speeds. This overcomes molecular forces and allows microscopic water molecules to escape.

TAG Technical Score:

Energy Savings: 90%

Regional Potential: 0.00 MWh/year

ID: 121

Use Supplemental Cooling for Occasional Loads in a Data Center

Employing supplemental cooling to high demand racks to avoid over-sizing primary equipment for transient peak loads and/or hot spots.

TAG Technical Score:

ID: 502

Variable Refrigerant Flow (VRF) Heat Pumps

An advanced variable-speed heat pump system can save energy when compared with conventional air-to-air heat pumps due to better part-load efficiencies, heat recovery, and reducing or eliminating duct losses.

TAG Technical Score:

Energy Savings: 20%

Regional Potential: 1.47 MWh/year

ID: 200

Water Source/Ground Source Heat Pump Heating and Cooling System

Heat pumps that extract heat from a water source (well, river, pond) and distribute it to residential and commercial spaces, such as assisted living units, hotels, dorms, schools, jails or district heating systems.

TAG Technical Score:

Energy Savings: 25%

Regional Potential: 0.05 MWh/year

ID: 29

Wireless Pneumatic Thermostat

Retrofit pneumatic thermostats with wireless pneumatic thermostats to allow DDC-type control with programmable setbacks, diagnostics, and communications capability

TAG Technical Score:

Energy Savings: 25%

ID: 264

Level	Status	Description
1	Concept not validated	Claims of energy savings may not be credible due to lack of documentation or validation by unbiased experts.
2	Concept validated:	An unbiased expert has validated efficiency concepts through technical review and calculations based on engineering principles.
3	Limited assessment	An unbiased expert has measured technology characteristics and factors of energy use through one or more tests in typical applications with a clear baseline.
4	Extensive assessment	Additional testing in relevant applications and environments has increased knowledge of performance across a broad range of products, applications, and system conditions.
5	Comprehensive analysis	Results of lab and field tests have been used to develop methods for reliable prediction of performance across the range of intended applications.
6	Approved measure	Protocols for technology application are established and approved.

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