Multizone to Variable Volume HVAC Controls Retrofit Design & Implementation Suite  

This retrofit converts an existing constant volume multizone HVAC system (MZ–CV) to a variable volume (MZ–VV) system for increased energy efficiency. The technique makes limited changes in instrumentation and uses a novel control scheme to reduce fan speed and coil use when not needed. A demand controlled ventilation option also reduces ventilation when spaces are unoccupied. The retrofit is significantly less expensive and less disruptive than a full system change-out (to VAV). This retrofit can be an interim solution to meet energy reduction targets and accrue savings now while postponing large capital investment. Field demonstration found 24–60% energy savings at the air handler. Typical applications are expected to pay back in 3–5 yrs.

A suite of design and implementation support tools steps a potential user through technology evaluation, procurement, and performance verification. The files are numbered roughly in the probable order of use. Pertinent document formats (including PDF , Excel spreadsheet , Word document , PowerPoint , and AutoCAD drawing files (zipped) ) allow rapid system analyses and development of procurement packages.

A technology field demonstration was conducted, and these design and implementation technology transfer tools were developed by the Engineer Research and Development Center, Construction Engineering Research Laboratory (ERDC-CERL) under the DoD Environmental Security Technology Certification Program (ESTCP).

Retrofit Project Links

• ESTCP Multizone Variable Volume Retrofit Field Demonstration Project
• ESTCP Multizone Variable Volume Retrofit Technology Transfer Project
• Multizone to Variable Volume HVAC Control Retrofit Training