Abstract: A method of preventing smoke curling from beneath depending enclosure walls of a grease extraction ventilator, comprises providing a series of apertures in the walls from adjacent the lower edge thereof for a predetermined distance upwardly. The apertures are preferably comparatively small and relatively closely spaced, being preferably placed in parallel rows, also parallel to the lower edge of the wall, with the apertures of adjacent rows. The number of rows may be varied, depending on the height of the wall and the capacity of the ventilator, with additional apertures for a ventilator having a larger capacity. The apertures may be slots, such as relatively short, and with the spacing between parallel rows being equal to or less than the height of the slots, with the lowest row being relatively close to the lower edge of the wall. Or, the apertures may be circular or having other shapes, such as oval, elliptical or the like.

Abstract: The heat exchanger has a hollow coil through which a liquid is to flow, having a series of adjacent, essentially parallel turns, between which turns members having apertures for the flow of a fluid therethrough, elongated heat conducting paths and in compressed and deformed condition are disposed, for clamping contact with the turns and pressure contact with each other. Examples of such members are woven mesh having strands and expanded metal foil. The members extend across the space encompassed by the turns and thus conduct heat between the turns and a fluid passed through the mesh members in the direction of the axis of the coil, i.e. perpendicular to the planes of the coil turns. The members and coil turns are maintained in compressing contact by a perforated plate at each end of the coil, which plates engage the adjacent members.

Abstract: Transfer waste water from wash cycle of dishwasher to collection tank beneath heat exchanger surrounding hollow central space, pass waste water through dual tube heat exchanger in countercurrent relation to cool feed water for hot water heater in central space of heat exchanger, supply heat to water in heater, then hot water to dishwasher rinse. May circulate feed water downwardly through outer space of heater, formed by partition, to lower end of inner space, in which heat is supplied by electrical immersion heaters. Ends of tank of hot water may be semi-oval, semi-elliptical or the like, while partition may be sufficiently close to bottom of tank to produce a wire-drawing effect as inlet water flows from outer to inner space, thereby maintaining light or small particles which fall off electric heaters in circulation, so that such particles will be removed with hot water. Heavier particles will collect in bottom of tank and may be drained periodically.

Abstract: A holding tank receives waste water from a dishwasher or laundry machine having a rinse cycle and at least one wash cycle. A pump moves the waste water through a heat exchanger at the same time that the rinse cycle requires hot water from a hot water heater. The cold water feed for the hot water heater is also passed in countercurrent heat exchange relationship with the waste water to provide warmed or heated makeup water at the same time that hot water is being withdrawn therefrom. The cooled waste water from the heat exchanger may be collected in a tank and supplied to any one or more of several additional devices, such as a water cooled refrigerant compressor, a grease extraction ventilator having water contact means, a waste food grinder, etc. The ventilator and compressor may also be placed in series, while the cooling water heated in the compressor is recirculated to the heat exchanger.

Abstract: A method of producing multiple coil, multiple tube heat exchanger from circular tubes, in which alternating turns in each coil have a warmer liquid and other turns a cooler liquid, by coating the outside of each coil with a heat conductive mastic and winding the next coil against the mastic to force the mastic into spaces between adjoining tubes of the first coil, into spaces of adjoining tubes of the second coil and into spaces between opposed tubes of first and second coils. Mastic applied to outside of each coli or into grooves between turns as next coil wound. Double tubes of each coil preferably wound into grooves between turns of preceding coil. Second tube of each coil started across coil from first tube and continued at end of coil past first tube. Succeeding coils wound against mastic in same manner. Turns of first coil attached together, as by soldering, while first and last turns of succeeding coils similarly attached to adjacent turn of coil beneath.

Abstract: A method of supplying tempered makeup air to a room in conjunction with a grease extraction ventilator disposed above cooking equipment in the room and having removal means for removing grease and smoke particles and the like from air mixed with products of cooking, which includes removing heated air and the remaining products of cooking, after passage through the removal means, through a discharge duct; tempering fresh air in a heat exchanger and discharging the tempered fresh air into the room; passing incoming air to the discharge duct in a manner which automatically regulates the amount of exhaust and makeup air required to remove and replace the minimal amount of outside air to eliminate heat, odors, smoke, gases, grease and dirt as the cooking load changes; and causing incoming air, which is not passed to the discharge duct, to become a portion of the tempered air for discharge into said room.

Abstract: A series of tubes wound in spiral, spaced relation in pressure contact with the next inner tube or a central cylinder to form, between them, a spiral path for one liquid flowing upwardly in the space between the tubes, while another liquid flows downwardly in the tubes. The outermost tube may be enclosed by a sheath in pressure contact therewith, while several sets of tubes, separated by corresponding sheaths, may be utilized. The diameter of the tubes may be varied for the sets to compensate for the greater length of tubes at an outer position, so that an approximately equal time of travel from one end of the tubes to the opposite ends may be obtained. The spacing between the successive turns of the coils is preferably a distance corresponding to one half the diameter of the tubes.

Abstract: Fresh, outside air may be supplied to a first space, such as a dining area of a restaurant or the like, while air from the first space may be recirculated through an air conditioning unit for cooling or heating the air, which is returned to the first space. Also, air from the first space is transferred to a second space, such as a cooking room of a restaurant or the like, which contains heat producing cooking equipment, the latter resulting in the second space having additional cooling requirements. Such transfer air is passed through a chilling device, in which the air contacts water, as through sprays or a water bath, to cool the water to a temperature close to the dew point of the air, and also to correspondingly cool the air furnished to the second space. When cooling of air to the first space is required, either the recirculated air, but preferably the fresh air, is cooled by the chilled water produced by the chilling device.

Abstract: A gaseous source of waste energy, including heat, is passed through a gas to liquid heat exchanger and then a chiller to agitate a water bath and produce evaporation of water for cooling. The heated transfer liquid is passed through a heat exchanger to heat makeup air or the like, while, alternatively, chilled water from the chiller is passed through the heat exchanger to cool the makeup air. The source of waste energy, including heat, is normally a grease extraction ventilator mounted to receive fumes and heated air from cooking equipment. Any other source of waste energy is normally suitable, such as heated air which has risen to the upper portion of a large room or enclosure, such as an auditorium, theater, meeting hall or the like. The heated air removed from such a position is adapted in part to be recirculated, but all of it may be used to furnish heat for heating fresh makeup air. Several forms of chiller, including specialized double compartment chillers, are disclosed.

Abstract: A gaseous source of waste energy, including heat, is passed through a gas to liquid heat exchanger and then a chiller to agitate a water bath and produce evaporation of water for cooling. The heated transfer liquid is passed through a heat exchanger to heat makeup air or the like, while, alternatively, chilled water from the chiller is passed through the heat exchanger to cool the makeup air. Supplemental heating, as by a furnace, or supplemental cooling, as by refrigeration, may be utilized when called for.Separate heat exchangers, as for separate areas, are alternatively supplied with heated transfer liquid or chilled water, or one or more supplied with heated transfer liquid and one or more others supplied with chilled water.The source of waste energy, including heat, is normally fumes and heated air from cooking equipment passed through a grease extraction ventilator.

Abstract: A grease extraction ventilator includes a water bath or water sprays into or through which are directed the products of the gaseous stream rising from cooking equipment and which tends to maintain an ambient temperature. This water is pumped through a heat exchanger for a portion of incoming makeup air directed into the room, the remainder of which is directed toward the intake for smoke and the like, to reduce the amount of air withdrawn from the room by the suction blower. The heat exchanger may also be utilized at a desired location, within or outside of the room in which the ventilator is installed, to heat or cool air or other fluids for heating or other purposes. Air may be directed into the upper portion of the room, such as adjacent the ceiling through a horizontal slot which causes the air to move horizontally to mix with the highest temperature air in the room and flow to portions of the room spaced from the ventilator, thereby avoiding drafts blowing against the cooking personnel.

Abstract: A series of mesh layers, approximating a loosely woven cloth, are placed between successive adjacent, parallel tubular coils or bends through which a liquid flows. The assembly of coils and mesh layers is compressed to produce a clamping contact between the mesh and each of two opposed coils, as well as compressing the mesh together, both within and outside the areas of the coils. The mesh which intersects an end of the coil is split, so that the mesh may lie on both sides of the coil at that position. A perforated plate may be placed at each end of the mesh and coil assembly, with a screen interposed, in order to maintain the mesh and coils in a clamped condition. The perforated plates may be spot welded to the inside of a housing, the parts of which are also compressed against the mesh and coil assembly. The compression of the mesh against the coils not only provides a greater area of contact of the fibers, strands, wires, etc., of the mesh, but also produces a clamping or pressure contact.

Abstract: The makeup air device includes a front chamber, a lower wall of which is adapted to force rising smoke and the like into an intake of a grease extraction ventilator. A depending passage at the lower front of the device has an air outlet which discharges air toward the ventilator intake. An adjustment baffle having a forwardly slanted lower flange is moved in the outlet between a position of maximum flow and a position of no flow. Louvers in the front wall of the chamber above the passage are adjustable, so that different amounts of fresh air may flow into the room in which the cooking equipment is placed.

Abstract: The coping is mounted atop the gutter and each is formed of stainless steel, with the top surfaces being sandblasted to prevent slipperiness, particularly when wet. The gutter, which carries water overflowing and draining through slots in the coping, is also used as a form for pouring the concrete walls of the pool. The gutter provides not only check points for transit leveling, but also an upper rear flange for use in leveling the top of the concrete when poured.The rear of the coping is supported by the gutter, while the depending front wall of the coping is supported by an upwardly extending front wall of the gutter, at an outward offset of each, through a series of special, fine adjustment connecting devices. The upstanding front nose of the coping determines the level at which water will overflow, while the various sections of the coping may be adjusted through the fine adjustment devices, to correspond with the water level, thereby providing a highly accurate level setting for the rim.

Abstract: A purifier which includes round and spiral labyrinth passages in heat exchange relationship with similar passages, the incoming passages leading to and the outgoing passages leading from a container for gettering material heated by electrical heaters. The circumferential walls of the round passages are attached together by angular offsets in opposed positions, preferably at about 45.degree.. The spiral passages are formed by a circumferentially spiral plate with an end wall at each end of each passage. The plates may overhang the end walls, so that the plates can be melted back to fuse with the end walls. Also, the heat applied during such melting and fusion heats the end plates sufficiently to be readily bent into a spiral. A second container for gettering material may be located, with or without heating, along the outward path of the heated gases where the temperature will correspond to a lower temperature for further reaction of the gases with a gettering material.

Abstract: The coping and gutter of a rim flow swimming pool are supported by upwardly and downwardly adjustable jacks at spaced positions around the perimeter, with each beneath the lateral center of gravity. A gusset plate extends rearwardly from a reinforcement for the rear wall and may be moved upwardly and downwardly to adjust the transverse level. Each gusset plate, after final adjustment, is attached to a stake. The jacks and the gusset plates are adapted to be embedded in the concrete which forms the wall of the pool, preferably poured in layers by the "Gunite" method, and serve as reinforcements for the concrete.

Abstract: A purifier having a central core in which is disposed a container for gettering material surrounded by electric heaters. Labyrinth passageways for heat exchange between the incoming and outgoing gases is formed by a series of "cans" which are welded in position and have an increasing end plate diameter and shell diameter from the core outwardly. Interspersed shells provide for incoming (outgoing) gas to pass from one end to the opposite end of a cylindrical passage, then turn around the end of the shell and pass in the opposite direction along the next inner (outer) passage. The incoming gas is transferred between passages by holes in alternate end plates, while the outgoing gas is transferred between one passage and the next outer passage by a "floating" end plate, around the inside circle of which the outgoing gas passes.A second container of gettering material, if desired, operating at a lower temperature can be interposed in the central core, but is insulated from the first container.

Abstract: A hot food counter is disclosed having a lower heated section for storage of food and an upper heated section for display of food. The upper section is enclosed with food being placed into the upper section by service personnel through sliding doors at the rear wall thereof, while food is withdrawn by customers through a pair of contoured openings in the front wall. The enclosure for the upper section is preferably transparent except for the sliding doors in the rear walls which preferably have mirror finishes, and the tray within the enclosure and upon which food is displayed is preferably inclined downwardly and forwardly, as is the top wall of the enclosure.