Research Project Information

Research Project Summary Information

DEEP Coil: Energy Efficiecnt HVAC/R Heat Exchange for Residential Buildings (ST10372-1)

ThermoRise, Inc.


Finned tube heat exchangers (coils) are used as core components in the Heating, Ventilating, Air Conditioning, and Refrigeration (HVAC/R) industry. The coil manufacturing industry is very mature, and has not had a new design in over 50 years. Prototype development and testing for a new coil design concept called “DEEP coil” has been ongoing and is now ready for product development and demonstration. USDOE has imposed higher energy efficiency standards (SEER) on the HVAC industry. This industry has responded with coils having narrower fin spacing and more air resistance. The coils give them increased SEER values, but are prone to clogging from dust and debris, which rapidly reduces the heat transfer efficiency and capacity. The DEEP coil configuration allows much longer, real-time contact with airflow, thus promoting more complete heat transfer and reduced electrical fan power requirements.

Map Error

Project Description

The project will include the purchase of fin die-tooling to build prototypes. A coil testing facility will be used to test the DEEP coil against conventional coils, and document performance. The best applications will be identified, e.g., refrigerant-to-air condensers with fans for residential applications. Optimum coil configurations will be made for each application, and laboratory testing will be performed to confirm performance. The DEEP coil will then be marketed to the HVAC/R industry.


•Electricity through reduced fan power to move conditioned air •Longer retention of energy efficiency due to less clogging, less tendency to icing, and less propensity to mold, leading to improved indoor air quality (IAQ).

Project Results

The Contractor tested a few models of the DEEP coil and compared it to thin coil empirical and analytical data. From the preliminary laboratory testing the DEEP coil showed a 20% savings in fan electrical power, which was a reduction from approximately 1/33 hp down to 1/40 hp, or about 5 watts. Such small fan motors are not representative of those in the field. That, coupled with this being a new technology, raises doubts about the validity of extrapolation to predict performance of larger fan motors. Ultimately, further laboratory analysis and field demonstrations are required to provide a thorough evaluation of the DEEP coil performance. The Contractor is attending tradeshows.


ThermoRise, Inc.
8253 Sugarland Dr
Manlius, NY 13104

Principle Investigator

Hemant Kale

Universities Involved


Project Type:

Product Development

Technologies Types:

Building Systems
Heating, Ventilation, & Air Conditioning

NYSERDA Contact Information

Nathan Russell


R&D - Buildings Research

Contract Details

Start Date: 1/11/2010
Project Status: Active
Contract Number: ST10372-1

Last Updated: 2/4/2014 1