• How Infra-Red Works
• What Savings You Can Expect
• Common Applications
• About Detroit Radiant

• HL Series
• DX Series
• DTHS Series
• DRV Series
• DBS Series
• DR Series
• Portables
• Electric Infra-Red

State of the art, two stage gas-fired infra-red heater

RESULTS: As the findings below will attest to, the RE-VERBER-RAY HLSeries has proven cost saving benefits over single stage infra-red heaters.Documented fuel savings, reductions in on/off cycles, faster recoveries andincreased comfort levels are some of the benefits that one can expect by usingtheHL Series.

THE FINDINGS:

The test period ran from October 15, 1993 to April 15, 1994 (184 days or 1/2year). During this time, the "single stage" portion of the test (wherethe heaters ran only at 100 MBTU/h) and the "two-stage" portion of thetest (where the heaters were allowed to switch between 65 MBTU/h and 100 MBTU/hbased on heating demand) were each in operation for 92 days. The average outsidetemperature for the "high" portion was -2.3°C (28°F) and forthe "two-stage" portion -1.3°C (29.5°F).

The first of the RE-VERBER-RAY HL Series units has an averagecycle time of 39.5 minutes on "high", and 69.5 minutes on "low",demonstrating longer heater operation on "low fire". On the firstunit, the number of on/off cycles was reduced by 35%.

The second of the RE-VERBER-RAY HL Series units has an averagecycle time of 44 minutes on "high", and 78.1 minutes on "low",again demonstrating longer heater operation on "low fire". On thesecond unit, the number of on/off cycles was reduced by 36.5%.

Natural gas consumption was reduced using the "low" operationfor the two HL Series units by 12% during the six month period -a saving of 23,018 cubic feet of natural gas.

CONCLUSION

The RE-VERBER-RAY Two-Stage HL Series has been shown to be a moreefficient heating system than standard single-stage infra-red heaters.

A minimum savings of 12%, in energy usage, was documented using the HLSeries. This is in comparison to single-stage infra-red heaters. Otherbenefits that this study revealed were:

• 35% reduction in on/off cycles, resulting in improved employee comfort (Seefigures 1 and 2).
• Improved product life due to the reduction in on/off cycles.
• Overall improved operating efficiency, reducing carbon dioxide emissions.
• Faster recoveries. Energy is not wasted reheating the exchangers when "highfire" is called for.
• Design benefits. The HL Series allows you to design your building inaccordance with the "worst case" design temperature. Realistically,this rarely occurs and the heater will make the appropriate adjustments.

RDM ENGINEERING

Over the past 12 years Guelph, Ontario based R.D. MacDonald, P.E. andRDM Engineering have researched and produced a number of scientific, technicaland information papers on the subject of energy efficiency, as well as tested and reported on other energy matters for a wide variety of clients. Serving asan Energy Advisor and Energy Specialist to government, major utilities and private sector clients. Mr. MacDonald and RDM Engineering remain actively involved in a broad spectrum of energy matters, including their recent testing and reporting on the RE-VERBER-RAY Two-Stage, High-Low HL Seriesdetailed in this Technical Report.

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