HL Series Technical Report

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	HL SERIES TECHNICAL REPORT

INTRODUCTION:

DETROIT RADIANT PRODUCTS COMPANY developedand introduced the RE-VERBER-RAY Two-Stage, HL Series (high-low) inearly 1993. A Study was undertaken to objectively document the benefits oftwo-stage infra-red heating. In cooperation with its' Canadian associatecompany, Brant Radiant Heaters, Ltd, Detroit Radiant contacted RDM Engineeringand requested that a documented study be compiled. In October 1993 RDMEngineering, an independent research firm, engaged a test that documented anddemonstrated the benefits of theHL Series.

The patented design of the HL Series features a 'calculated inputdifferential' which allows the heater to operate in a "high-fire" or a"low-fire" mode. The differential between the two levels of operationis 30%. ASHRAE weather records show that an average of 90% of the degree hours,within the USA, can be satisfied by operations in "low-fire". Only 10%of the degree hours will require operation in the "high fire'' mode. Whatthis means is that this heater will adjust to the environment, producing themost comfortable and economical infra-red heat available. The building will becomfortably heated during a moderately cold day, yet the heaters are capable ofsatisfying the design heating capacity on the coldest of winter days.

The inside of the test site, representing a typical industrial building,and showing the RE-VERBER-RAY Two Stage HL Series . This heating systemobjectively documented a minimum of 12% additional energy savings-and a 35%reduction in "On and Off cycles"- when compared to a single inputsystem.

THE TEST SITE

The test facility was carefully selected to reflect not only typicalindustrial building construction, but also a commitment by management and staffthat consistent work patterns would be maintained during the test period. Adetailed heat loss study of the test facility prior to the start of the testperiod documented a total building heat loss of 200,000 BTU/h.

Installation Details-Ceiling: 20' high. R20 insulation, steelinterior sheathing and fiberglass, tar and gravel roof Walls: 8",concrete block, non-insulation Doors: Two 3' x 8' exterior doors, one10' x 12' overhead Windows: none Use: HVAC contractor, equipmentrepair and storage.

Thetest site selected in October 1993 to objectively document the benefits of theRE-VERBER-RAY Two Stage, HL Series by an independent research firm.

TEST PROCEDURE:

Two 100/65 MBTU/H HL Series were installed along withHoneywell T775-A1019 controllers.
For this "real world" test theheaters operated on alternate days one of two ways: [1] On "two stage",whereby the heaters were either "off", or allowed to switchautomatically between the "low fire" (65 MBTU/h) and the "highfire" mode (100 MBTU/h) or; [2] On "single stage", whereby theheaters were either "off" or running in high fire" (100 MBTU/h),simulating a sing]e stage unit.

The two alternate operating possibilities of "low" and "high"as noted above, were switched on a controlled 24 hour cycle with the level ofheat output based on actual building heating demand. This methodology providedthe necessary controls to objectively compare the two alternative heatingmethods.

The Results of the Test

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