Improved DX Air-Conditioning Efficiency Insert installation name

Technology Description ClimaStat is a refrigeration-science technology that can be factory installed in new air conditioning equipment as well as field- retrofitted to existing equipment. ClimaStat advances unitary system technology by responding to varying latent (moisture) loads in addition to conventional sensible (temperature) load control. 

How Does It Work This figure shows the major component of ClimaStat added to a conventional unitary AC system, a liquid-suction heat exchanger/accumulator. Image source: Advantek Consulting Inc.

How Does It Work Continued Under this novel approach, energy efficiency is raised by increasing cooling coil velocity under most conditions, while reducing coil velocity when dehumidification is needed. In comparison, current standard unitary equipment cannot control the proportion of sensible and latent cooling; latent loads can only float and only sensible load is controlled. ClimaStat components address this problem with an optimized cooling coil mated with relatively simple, readily available parts from the food and industrial refrigeration industry, which are reliable, proven, easily maintainable, and low cost.

Benefits of the Technology Substantial reduction of energy use by unitary HVAC systems in DoD buildings is the primary benefit The carbon footprint associated with ClimaStat-equipped HVAC is less than conventional unitary equipment, due to the reduction in use of grid-delivered electricity Improved facility Indoor Air Quality (IAQ)

Technology Success Stories Technology has been successfully demonstrated by ESTCP at the Marine Corps Air Station (MCAS) Beaufort in South Carolina, and Patrick Air Force Base at Cape Canaveral, Florida. Building 1283, the MCASB Base Exchange

Potential Challenges and Solutions Improvement can be somewhat unit specific and depends to some degree on existing conditions. Variability can be managed with screening to identify potential system candidates, along with prediction of potential energy savings. The technology required about 3 gallons per ton per hour of water. Graywater use is not recommended due to the potential for bacteria growth. However, cleaner waste water may be feasible. Field retrofit costs can be higher than factory installations early in the learning curve at low quantities. Retrofit costs will be managed by employing trained experienced installation technicians.

Sample Financial Considerations From ESTCP Demonstration: The economic benefit of energy savings associated with the ClimaStat demonstrations at the MCASB and PAFB was calculated using BLCC 5.3 software, with the Milcon: ECIP template. Payback period was calculated to be 2.63 years for PAFB and 4.04 years for MACSB. Each project is evaluated by generating BLCC reports for 10 years and 20 years.

Bottom Line Pros Cons Increased energy efficiency Superior humidity control and fresh air ventilation Longer HVAC compressor life due to reduced refrigerant pressure differential and reduced operating hours Can be used as both a retrofit to existing unitary systems and as an enhancement to new equipment Cons With the field retrofit, improvement can be somewhat unit specific and depends to some degree on existing conditions Field retrofit costs can be higher than factory installations early in the learning curve at low quantities. Retrofit costs will be managed by employing trained & experienced installation technicians.

Where to Learn more Mr. Tim Tetreault, ESTCP Energy and Water Program Manager, 571- 372-6397 SERDP-ESTCP Website, https://serdp-estcp.org Mr. Michael West, POC at Advantek Consulting, Inc., 321-733-1426 x3, mwest@advantekinc.com

Backup Slides

Demonstration Performance Objectives

Demonstration Performance Objectives