Battery pack back-up for diesel fuel heated dessicant reactivation
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In a diesel fuel heated dessicant reactivation apparatus, a battery powered source of electrical energy is employed to maintain its heat exchanger operative when monitored temperature levels increase to that threshold at which the “fire-eye” and/or the primary relay of the ignition system would be otherwise damaged.

Hess, Spencer W. (Whiting, NJ, US)
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Primary Examiner:
Attorney, Agent or Firm:
Charles I. Brodsky (Marlboro, NJ, US)
I claim:

1. In apparatus for dehumidifying moisturized air present within a building from a point external thereto having an enclosure housing a heat exchanger, a dessicant, a first blower drawing ambient air from outside said enclosure over said heat exchanger through said dessicant in a first direction, a second blower drawing said moisturized air through said dessicant in a second direction, and means for firing said heat exchanger with diesel fuel, the improvement comprising: a thermal sensing device monitoring temperature levels within said housing; and a battery power source of electrical energy coupled between said thermal sensing device and said heat exchanger; wherein said thermal sensing device controls said power source to supply electrical energy to operate said heat exchanger when the monitored temperature levels increase to a predetermined threshold.

2. The improvement of claim 1 wherein said battery power source of electrical energy includes an electrical invertor.

3. The improvement of claim 1 in apparatus employing a heat exchanger operable with a “fire-eye”, wherein said temperature sensing device controls said battery power source to supply electrical energy when monitored temperature levels increase to a temperature at which said fire-eye is damaged by the temperature then within said heat exchanger.



A provisional application describing this invention was filed Sep. 17, 2004, and assigned Ser. No. 60/610,589.


Research and development of this invention and Application have not been federally sponsored, and no rights are given under any Federal program.



1. Field of the Invention

This invention relates to the restoration industry, in general, and to the drying-out of water damaged buildings, in particular.

2. Description of the Related Art

As is well known and understood, many factors can adversely affect the indoor air quality of buildings, but nothing is as threatening to the indoor environment as water intrusion. As is also well known, when water damage occurs—be it as a result of a burst pipe, a leaky roof or windows, or a flood—it becomes essential to take immediate action. Otherwise, the contents of vital records can be ruined, operations can be disrupted, tenants can be displaced, rental income can be negatively impacted and such irreparable damage can be done as to result in costly repairs or even total loss. As is more and more being appreciated, the moisture can also feed mold growth—which, in itself, is such an onerous threat as to which no building becomes immune.

As is additionally well known and appreciated, water intrusion often occurs without warning—for example, as a result of hurricane flooding, when pipes burst (frequently in the middle of the night or when no one is around), or when roof air conditioning systems fail.

When water intrusion of this sort occurs, a professional disaster restoration services provider is summoned to immediately take action to stabilize the environment, mitigate loss, and preserve good indoor air quality. After first quickly identifying “totalled” contents and removing them from the building, the next step is to dry the air using dehumidification systems specifically engineered for that purpose. In particular, the use of dessicant dehumidification systems has grown in popularity as the most effective water abatement technology due to their ability to create low relative humidity and dew point temperatures inside a structure. Unlike cooking-based dehumidifiers (which cool the air to condense moisture and then draw it away), dessicants attract moisture molecules directly from the air and release them into an exhaust air stream. Able to attract and hold many, many times their dry weight in water vapor, such dessicants are very effective in removing moisture from the air at lower humidity levels, and do not freeze when operated at low temperatures.

As described in my U.S. Pat. No. 6,652,628 (which issued Nov. 25, 2003), mobile dessicant dehumidifiers have begun to be employed more and more in recent years to dry water damaged buildings to reduce health problems caused by the incipient mold which develops. As is there noted, silica gel is oftentimes employed as the dessicant in a wheel through which the moistened air is pulled from the walls, the floor, the concrete, etc. into the dehumidifying chamber. As the silica gel absorbs the moisture, it became necessary to additionally heat the dessicant to liberate the moisture it collects. Where large scale dessicant equipment is employed, the heat energy required is typically provided by electric heating or propane heating. However, problems existed with both those methods of reactivating the dessicant.

As my aforementioned patent went on to describe, electrical heating required a large amount of electric power, which many damaged buildings would not have available. Utilizing alternatively provided generators, on the other hand, added additional expense from their rental, along with an accompanying high fuel bill. Propane fuel dehumidifiers, moreover, exhibited many disadvantages of their own: a) Special permits were frequently required to transport the propane to the work site by trailer or other vehicle; b) Additional permits were oftentimes required for working with propane at the work site itself; c) A resupply of propane may not be readily available—as where the building being dried was at a remote location or when a resupply was needed in the middle-of-the-night, or on a Sunday; d) Firing the dehumidifier with propane produced a moisturizing effect which undesirably wetted the processed air being dried; and e) Propane, itself, was highly flammable.

My patent recognized the need to rapidly dehumidify water-logged buildings and their contents by recirculating air between the building involved and equipment employed—with the air being ducted from the building through the equipment (which absorbs moisture from the air to lower its humidity), and with the dried air being routed back into the building where it absorbs additional moisture from the surrounding air in the building and the building contents. Also recognizing that the recirculation process needs to be carried out continuously, 24 hours a day, until the building interior is determined to be sufficiently dry, such drying process needs to continue for a number of days—especially where a structure such as a hotel or office building has been damaged by water due to a storm or the extinguishment of a fire. However, in order for the dessicant to keep absorbing water, my patent further recognizes that the dessicant must be continuously heated to evaporate the water that it has absorbed. Thus, the equipment employed required an energy source or sources to (i) drive a processed air blower to recirculate air to and from the drying equipment and the building, (ii) drive a reactivation blower to direct heated ambient air through the dessicant, and (iii) heat the ambient air prior to its passing through the dessicant. For a hotel, office building, or other typical commercial building, relatively large amounts of energy continued to be required to heat the ambient air so as to keep the dessicant sufficiently dry—due to the high volumetric rates of air flow involved (measured in cubic feet per minutes).

As described in my issued patent, on the other hand, such firing of the heat exchanger to heat the air for evaporating moisture from the dessicant forswore the use of electric heaters or propane burners as previously employed, and proceeded by the burning of diesel fuel—or its equivalent of kerosene or No. 1 or No. 2 fuel oil. As there set out, the diesel fuel thus employed in the heating process was available virtually anywhere where diesel trucks served as a means of transportation. Because diesel fuel provided a greater amount of BTU's per gallon than propane, less fuel was required to provide the heat for the dessicant than with propane, resulting in a cost savings in use. Also, because such fuel burned without producing moisture, the processed air became that much drier, enabling the reactivation of the dessicant to be accomplished faster, thereby increasing performance in operation. And, because the dessicant dehumidifier of the invention operated more efficiently, its construction allowed for a reduction in the required horsepower of the reactivation blower pulling the ambient air over the heat exchanger—resulting in a more compact machine, for easier transportation.


While proper water abatement and recovery operations require professional assistance in being able to quickly assemble a cohesive work team, provide rapid emergency response time, provide a turnkey operation for recovery and restoration with guaranteed results through the removal of standing and excess moisture so as to speed return to occupancy and operation of an affected business, similar needs (albeit on a reduced scale) continue to be needed where the loss occurs in homes, townhouses, condominiums and apartments. There, rather than primarily concerning itself with structural drying, large loss recoveries and systematic project management, primary concern is with cleaning, sanitizing and disinfecting interior surfaces—contamination from mold, bacteria, mildew and potential biological hazard to the occupiers of the premises are of greater concern. As described in my simultaneously filed Non-Provisional Patent Application entitled Self-Contained Trailer for Diesel Fuel Heated Dessicant Reactivation, Serial No. ______ a self-contained trailer can be had, in which the dessicant drier is itself mounted along with all things needed for the restoration service in allowing the equipment to be driven from place-to-place like an emergency response ambulance whenever and wherever a need arises.

However, in all these uses, a need has been found to exist for a battery back-up in the event an electrical power failure arises—or, even in the event that a disgruntled neighbor disconnects the electrical plugs and wiring in an attempt to quiet the noise generated during the machine operation. This followed from a realization that if the disconnect occurs in the middle of a heating cycle, the heat backs up through the burner to damage the oil burner itself by damaging its “fire-eye”, and/or the primary relay that serves as the ignition device for the burner.

As will be appreciated, the “fire-eye” is a safety device which looks at the fire in essentially controlling the burning to keep on operating; if the “fire-eye” senses that it is not then burning, the burner gets shut-off. Not only is it upsetting if a job stops when the electric power fails, the resulting cost to repair the damaged “fire-eye” becomes quite expensive.

In accordance with the present invention, an electric invertor is employed as part of the electrical panel which connects with its relays, devices and to a thermal device which is connected only to the blower part of the burner. If a power failure were to occur in the middle of a heating cycle, the thermal device control senses the heat in the burner that could cause the damage, and responds to activate the battery pack system to keep the blower running until the heat is blown out. Once the control cools down, it then becomes safe to shut everything off, so that the control effectively arms and disarms the system. Once the machine is shut off properly after the job is done, and cools down properly, the control essentially becomes shut off. A trickle charge can be employed to recharge the battery.


These and other features of the present invention will be more clearly understood from a consideration of the following description, taken in connection with the accompanying drawings in which:

FIG. 1 is a block diagram helpful in an understanding of the apparatus and method of my Patent No. 6,652,628 for dehumidifying air present within a building from a point external thereto; and

FIG. 2 illustrates the battery pack back-up for continuing the operation in the event of an electrical power failure which could otherwise lead to a damage of its above-described oil burner.


FIG. 1 illustrates the dessicant reactivation apparatus of my aforesaid patent and its method of operation through the use of an enclosure 10 having a heat exchanger 12 and a dessicant 14. Reference numeral 20 identifies a building in which moisturized air is present which the apparatus of the invention is to dehumidify, with the enclosure 10 having a bottom surface 16 which may rest upon a trailer or truck bed adjacent the building 20 once driven to the work site. Alternatively, the enclosure 10 could be off-loaded from the trailer or truck bed onto the ground itself. Reference numeral 18 indicates a diesel fuel burner according to that invention, having an exhaust gas stack 22. As will be understood, the diesel fuel burner 18 heats the exchanger 12 from the inside out.

As described in such patent, a first, or reactivation, blower 24 draws ambient air from the surrounds via an 18-inch ductwork 70, for example, into the enclosure 10, over and about the diesel fired heat exchanger 12 and through the dessicant 14 in a first direction, as illustrated by the arrows 50; the moisture liberated, heated air through the dessicant 14 is discharged outside the enclosure 10 as shown by the arrows 51-52. A second, or processed air, blower 26 draws the moisturized air from within the building through like ductwork 72 and the dessicant 14 in a second direction (shown by the arrows 60), which traps the moisture therein before discharging the dried air out the enclosure 10 as shown by the arrows 61-62. The diesel—fired heat exchanger 12 thus dehumidifies the dessicant 14 of the moisture collected from the wet building air in reactivating the dessicant 14 for continuing use.

In this construction, the ambient air from outside the enclosure 10 is shown as being drawn through the dessicant 14 in a direction opposite to that in which the moisturized air is pulled from the building through the dessicant 14. In such manner of use, a dessicant 14 including a silica gel composition was particularly attractive in collecting the moisture from the water damaged building's air.

As will be appreciated by those skilled in the art, such operation follows from the use of the silica gel dessicant being in the form of a rotating wheel in a frame within the enclosure 10. The operation then follows by providing the dehumidifying chamber with the heat exchanger and the dessicant, drawing the ambient air from outside the building over and about the heat exchanger through the dessicant in a first direction, and drawing the moisturized air out from the building through the dessicant in a second, opposite direction. In accordance with this, for example, FIG. 1 shows the processed air blower 26 as pulling the moisturized air from the building right-to-left to be dried, whereas the reactivation blower 24 pulls the ambient air from left-to-right to liberate the moisture collected by the dessicant. Such construction is typically referred to as “direct firing”, in which the heat from the burning chamber 12 passes directly through the silica gel wheel and its dessicant.

As will be understood, the problem of possible damage to the oil burner of the heat exchanger is unique to that with diesel fuel, kerosene and No. 1 or No. 2 firing in that a “fire-eye” is there employed. Were it to melt down as the heat backs up through the burner, once electrical power is lost during the heating cycle, the machine just stops operating. In propane driven set-ups, on the other hand, a solenoid is included which measures the pressure for the gas line; if there is no pressure present, the solenoid senses there is no fuel to run and it is automatically triggered and shut-off. With the propane fire then, it does not matter how much heat is present, as it is just a “hot stove” which essentially exists.

With the type of firing employed with the diesel fuel heated dessicant reactivation apparatus on the other hand, the “fire-eye” physical piece can be destroyed by the excessive heat. Once it is destroyed, even if the burner is attempted to be started again, the sensing device is not operable to control how the system is to operate. The present invention uses the motor that is already there to blow the air that the burner naturally has; when the power goes off, the motor shuts down in stopping any air movement and the heat that otherwise gets too hot to cause the damage that results. With the invertor of the invention keeping the motor running so that the hot air is blown out the natural exhaust, the temperature is reduced and the situation of possible damage is prevented from happening in the first place. FIG. 2 shows the battery back-up by reference numeral 110, the burner by reference numeral 112, the electrical panel for the system by 114, and the electric control by 116 which is triggered by either the power failure or the manual disconnecting of the electric wiring.

While there has been described what is considered to be preferred embodiment of the present invention, it will be readily appreciated by those skilled in the art that modifications can be made without departing from the scope of the teachings herein. For at least such reason, therefore, resort should be had to the claims appended hereto for a true understanding of the scope of the invention.

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