CH642738A5 - Method and device for extracting energy from waste gas - Google Patents

Description

642 738

PATENT CLAIMS

1. A method for generating energy from exhaust gas, in particular heat, for temperature control of air, characterized by

Passing the exhaust gas through a first heat exchanger (E *) and through a cooling system (C, H),

Passing a heat exchange liquid through the first heat exchanger (E *) to heat this liquid,

- Feeding the cooling system (C, H) with water, the cooling system being arranged by means of guide plates (20, 20 ') in such a way that the exhaust gas touches and moves a water bath (W, W'), so that the water evaporation generated causes the water and Gas cools,

- Passing (36,37,38) the mentioned heat exchange liquid of the first heat exchanger (E *) or the cooled water from the cooling system (C, H) through at least one second heat exchanger (E, El, E2, E3) and

- Passing air through an inlet through the second heat exchanger (E) to an outlet.

2. The method according to claim 1, characterized in that the exhaust gas is first passed through a grease separator (V).

3. The method according to claim 2, characterized in that the heat exchange liquid is water.

4. The method according to claim 3, characterized in that the exhaust gas is brought into contact with a water bath in the grease separator (V) and that the water of this water bath circulates in the first heat exchanger (E *) for precooling the exhaust gas if the air is only cooled .

5. The method according to claim 1, characterized in that the cooling water after flowing through the second heat exchanger (E) in the cooling system (C, H) and sprayed onto the water bath (W).

6. The method according to claim 5, characterized in that at least part of the returned water is sprayed in the form of a water curtain and that the exhaust gas is exhaust air which is pressed through this curtain.

7. The method according to claim 6, characterized in that the water is sprayed in the form of distributed parallel curtains and that the exhaust air is passed through these curtains.

8. The method according to claim 1, characterized in that the air for different rooms is directed to separate but similarly designed second heat exchangers (El, E2, E3), that the heated heat exchange liquid circulates through the second heat exchanger, the connected rooms of which warm the air require, and that the cooled water from the cooling system circulates through the heat exchangers (El, E2, E3) which cool the air.

9. The method according to claim 8, characterized in that additional heating is provided for the air when the temperature of the air at the inlet is lower than a limit temperature which is determined by the heating achievable by means of the heat exchange liquid in the second heat exchanger (E).

10. The method according to claim 8, characterized in that an additional cooling for the air is provided if the temperature of the air at the inlet is higher than a limit temperature which is determined by the cooling achievable by means of the cooling water in the second heat exchanger (E) .

11. The method according to claim 8, characterized in that the heated heat exchange liquid or the cooled water is made available to all individual second heat exchangers (E1, E2, E3) at the same time.

12. The method according to claim 8, characterized in that the heated heat exchange liquid or the cooled water is provided individually to the individual heat exchangers (E1, E2, E3).

5 13. Device for performing the method according to claim 1, comprising the following parts: a first (E *) and a second (E, El, E2, E3) heat exchanger and a water-fed cooling system (C, H) with a water bath ( W, W '), wherein either a heat exchange liquid that has previously flowed through the first heat exchanger or the cooled water from the cooling system flows through the second heat exchanger.

14. The apparatus according to claim 13, characterized by a fat separator (V) for receiving exhaust gas, the

35 contains smoke and heated air, and by a device that drives the air from the exhaust gas source through the grease separator.

15.Device according to claim 14, characterized in that the fat separator (V) with a water contact

2 Direction for removing grease, smoke and mist from the exhaust gas is provided.

16. The apparatus according to claim 15, characterized in that the transmission liquid which circulates through the first heat exchanger (E *) is water, and that a

25 device is provided which in turn allows this water to and from the water contact device of the fat separator (V) to run when the cooled water from the cooling system (C) passes through the second heat exchanger (E).

17. The apparatus according to claim 14, characterized in that the device for the movement of the heat exchange liquid and the cooled water through the exchanger contains a common pump (74) with inlet and outlet valves each for the cooling system and the first heat exchanger.

18. The apparatus according to claim 13, characterized in that a plurality of separate second heat exchangers (E 1,

E2, E3) are provided for heating or cooling different rooms, that a device is provided that allows the heated heat exchange liquid to circulate through every second heat exchanger and that another device alternatively allows the cooled water to circulate through every second heat exchanger.

19. The apparatus according to claim 13, characterized in that the cooling system (C) has a longitudinal floor (11 ') and opposite, upwardly directed walls (18,

4518 '), in which a water chamber for a water bath (W, W') is contained, that the walls and that length-extending plates (19, 19 ') spaced above the walls allow the air flow over each wall and in direct the water chamber and that a guide plate (20, 20 ') is provided, pointing downwards from the inner edge of each plate (19, 19').

20. The apparatus according to claim 19, characterized in that spray nozzles (31, 32) are directed towards the bath from a location above it.

21. The apparatus according to claim 19, characterized in that the opposite walls (18, 18 ') stand upright and the plates (19, 19') run horizontally and the guide plates (20, 20 ') are directed outwards towards the walls.

22. The apparatus according to claim 19, characterized in that the opposite walls (18, 18 ') are inclined outwards, the plates (19, 19') are inclined downwards and inwards, and the guide plates (20, 20 ') are inclined are inclined below and inside.

23. The device according to claim 19, characterized in that the longitudinal, centrally arranged transverse plate (27) is provided above the plates (19, 19 '), that flanges (28) pointing downwards on each of the opposite sides and a row of nozzles (23) on the underside of the cross

55

65

3,642,738

plate are provided distributed in the longitudinal direction, which testifies a side-second pipe for connecting the second pipe to the loaned and longitudinally directed horizontal spraying of the heat exchange return pipe or the cooling return pipe, of which at least a part is connected against the flanges of the valve (68) is what causes the cooling system to bump water upper cross plate. to reduce air leakage when a switchover

24. The device according to claim 13, characterized in that the feed to the heat exchanger by heating net, that the cooling system (C) is divided into (24) cooling and vice versa.

Contains the center of the chamber for the water bath, which extends from the 30th device according to claims 13 to 29, to the upper cross plate (27) to a point above the bottom of the energy recovery from two separate exhaust gas sources, the chamber. each contain air that differs in temperature,

25. The device according to claim 13, characterized gekennzeich- io characterized in that for each exhaust gas source a net that it is longitudinal, upright on the edges of a separate cooling system is provided.

Inlet opening arranged in the floor, opposite walls (18, 18 '); as well as sides, bottom and

End walls are provided that are opposite to each other

Walls form two water bath rooms (W, W ') that one in 15 exhaust gas for energy, in particular for

The first transverse guide plate (19), which runs in the longitudinal direction, lies above the use of heat, has opposite walls through a first heat exchanger and has depending conductors for heating an exchange liquid and then through plates (20, 20 '), so that a cooling system is guided through the inlet opening to move a water bath and gas into the opposite walls (18, 18 ') into which the water and the exhaust gas are evaporated

Water baths flows, the second transverse guide plates (21, 21 ') pre-cool. The heated heat exchange fluid is seen through, which extend from these side walls against the in - at least a second heat exchanger for heating nere up to a point via the associated first cross-guide while alternatively cooled water from the cooling system (19) and to the lower edges of the flange flows through the second heat exchanger, around which see (22, 22 '). from the inlet to the outlet of the second heat exchanger

26. The device according to claim 25, characterized in cooling air 25 passed through. Additional heating e.g. net that they have a middle partition (17), the inlet in through an oven or additional cooling, e.g. A cooling duct divided into two entrance passages and between the supports can be used if there is a need. Separate right walls (18, 18 ') and up to the first cross-guide second heat exchanger e.g. for separate rooms, a plate (19) can run, and has a middle upper lower part, also with heated heat exchange liquid or cooling (28), which supplies the room above the first transverse baffle (19) with water.

divided and between and above further transverse guide plates There are numerous types of treatment plants

(27,27 ') runs, and that separate outlets (15,15') for that of air. For some species that are commonly referred to as

Rooms (13) above the transverse baffles (27, 27 ') provided 1er »are known, water is instilled in an air stream. or contacted by air by being through water

27. The apparatus according to claim 15, characterized marked 35 absorbing pillow is passed. The air acts as the water contact device of the grease separator, then the evaporation of part of the water acts, where- (V) a water chamber (52) with forward inclined by the temperature of air and water due to the number of wall and upright rear wall and upright end walls of units for balancing the latent heat of the Verden that an inward and downward vaporization of the water is reduced. For this cooling, the flange (53, 100) with a distance above the front wall (98) of the air should normally be relatively dry, since a chamber is arranged which is from the upper end of the pre-type "sump cooler" with real effectiveness at over -The wall runs to the rear and diverges so that a plate (101) lying in the same plane does not lie on the moderate relative humidity of the inlet air above 50% flange (100). The so-called "sump cooler" can be used for those who can be adjusted upwards and downwards on the flange, especially in places where the relative humidity of the air is low and that it moves from the lower edge of the plate (101) to " or in summer, when cooling is required, a lip (102) extends particularly below and in front. suitable. Obviously, cooled air with a normal

28. The apparatus according to claim 27, characterized by times in a room given relative humidity of a running from the rear wall (103) forward and 100% unacceptable for humans. The method according to the plate (101) and flange (100) diverging angular guide invention is defined by claim 1.

plate (104), one from the top edge of the guide plate (104). The source of waste energy, including heat, is a running horizontal guide plate (105), which is usually smoke and heated air at the front end and gases from the horizontal guide plate (105) the front-facing spout of the cooking system, which is passed through a fat extraction fan (106) and into which the horizontal baffle plate (105) is led. Such a degreasing fan can lead, and which contains a lower wall (99), from the back of which contain water contact devices, the water of which, through the edge of the flange (100) directed downwards and backwards 55, can circulate the heat exchanger when there is only cooling. by circulating cooled, supplied by the cooling system

29. The device according to claim 13, characterized in water is desired.

that the heat exchange liquid is water and the heat. There may also be other sources of exhaust gas energy exchanger (E *) located under the cooling system (C), e.g. heated air that connects to the upper part of a large one that a feed pipe (75) connects the heat exchanger (E *) to a 60 room or the like, such as an auditorium, a theater, a pump (74), that a return pipe with the heat Assembly hall or the like has risen. The heated, exchanger (E *) is connected to the fact that at the lower part of the air taken from such a place, water bath (W) of the cooling system (C) is partially used to recirculate a pipe (30), but all the air can be decided and connected to the feed pipe (75) can be used to return heat to the heating system for heating fresh air. The cooling return pipe (84) returns water to the cooling system (C). There are some forms of cooling systems, including a first pipe (37) connecting the pump (74) to the inlet of the special double compartment cooling system as well as other heat exchangers (E *), and a second pipe (38) from the path to the return line Water to the Kühlan outlet of the heat exchanger (E *) goes out and described.

642 738

4th

In order to use the waste energy, the exhaust gases come into intimate contact with water, which can be achieved with a relatively small amount of complexity and cost. This feature is for such a method and a device in which a water flow can be adapted to the volume of air or gases, so that not only the air or the gases but also the water is cooled and can be extracted for heat exchange with additional air especially applicable in situations where the original air is not perfect for use as input air for the same or another room. Such a case can occur if the resulting air has an unacceptably high humidity or contains smoke or other substances produced during cooking or the like,

or is dirty for some other reason.

The source of heated exhaust air or exhaust gases can e.g. be a cooking system. The air or gases may be passed through a heat exchanger to heat water or other heat exchange fluid therethrough after passage into contact with water, such as a grease extraction fan according to U.S. Patent 3,841,062 for extracting the air or gases. This heated water is used in a heating system when the outside temperature is lower than the temperature to be kept inside, but can also be carried out at a higher outside temperature than the one to be kept inside after passing through part of the water and cooling the water. The cooled water can then be delivered to one or more heat exchangers to direct the air for introduction into the room or other area to be cooled. This latter heat exchanger can be located at a remote location e.g. also located on a roof.

The manner in which these objects are achieved and how other objects and novel features of the invention are achieved is described with the aid of the drawings.

In the drawings:

Figure 1 is a vertical center section of an exhaust air water cooling system in which separate air sources are routed against individual water bands and used or discharged separately, while the water cooled by the air flow passes through a special second heat exchanger at any time in order to cool the air from another source;

Figure 2 is a vertical section through a drain pipe and an overflow cap, which are used in the water baths of Figure 1, on a larger scale.

Figure 3 is a vertical center section of a fat extraction fan, which is located above a cooking system and in which the exhaust air after the fat removal flows through a first heat exchanger and delivers warm water for heating purposes on cold days or the exhaust air after the fat removal can pass through a water cooling system provide chilled water for air cooling on warm or hot days;

Figure 4 is a plan view of the plant of Figure 3 on a smaller scale;

FIG. 5 shows a flow diagram with the control devices that are used with the heating and cooling system according to FIG. 3 and the heat transfer devices for the treatment air;

FIG. 6 shows a similar flow diagram of another arrangement in which individual air heat exchangers can be supplied with either a heating or a cooling liquid and also an alternative return flow arrangement for the cooling system;

FIG. 7 shows a partial section of a return guide and nozzle arrangement according to FIG. 6;

FIG. 8 shows a vertical center section of a fat extraction fan according to FIG. 3, but with another water chamber,

other baffles and other overflow arrangements and especially another cooling system;

Figure 9 is a partial horizontal section on the line 9-9 of Figure 8 on a larger scale; and

FIG. 10 shows the diagram of a pump and control valve arrangement for two fans according to FIG. 8.

In the exhaust air or exhaust gas water cooling system according to Figure 1, a housing H contains two separate water bath chambers W and W ', which have special liquid sources and exhaust air or 10 exhaust gas sources with the inlets 10 and 10', with a corresponding opening in the base plate 11 of the Housing are connected. The housing also includes side walls 12, end walls 13 and an upper wall 14 which have openings for attaching two outlet lines 15 and 15 '. Between the end walls and away from the center as a divider between the lines 10 and 10 'there is a vertical plate 17, from each side of which an upright plate 18 and 18' is arranged. The air or gases on each side flow over the top edge of the respective wall 2018 and 18 ', while over these walls a horizontal plate is spaced above the divider 17 and runs between the end plates of the housing. At each edge, the plate 19 has a flange 20 and 20 'which is brought down, on which an angled guide plate 21 and 21' is adjustably attached, which has a flange 22 and 22 'which leads down to the corresponding wall 18 or 18' is. The plate 19, the flange 20, 20 'and the flange 22, 22' push the air or gases between the wall 18, 18 'and the lower edge of the flange 22, 22'. The lifting of the lower edge of the flanges 30 and 22 'is set so that with the respective volume of air or gases it engages the upper surface of the water in the bath and drives it upwards and away from the flange 22, 22' it bumps against the respective side wall 12 of the housing. Two removable plates serve to set access to the respective guide plate 21 or 21 '. An upright pipe 25 or 25 'is correspondingly provided with a drain cap 26 or 26' at its upper end in order to keep the water depth in the respective bath at the correct level.

40 After leading upwards from the water bath, the air or the gases meet a transverse guide plate 27 or 27 ', which is attached to the respective inner wall 12, leads from this inwards and each has a downwardly inclined flange 28 or 28' around which the Air or gases are carried. In this way, air or gases are subjected to a pulling action that removes water drops, not only by the action of the flanges 28 or 28 'per se, but also by rotating air around gases around the flanges so that water drops are removed by the centrifugal force. 50 to be hurled.

The cooled air or gas, i.e. cooled by evaporation of water on each side of a central partition 29 up to a discharge line 15 or 15 ', where it is used as conditioned air in the same or in another room or is only discharged. The flow through the discharge line 15 or 15 'can be carried out by a conventional suction fan (not shown) in a line outside the drawing.

60 In addition to using the resulting air, e.g. an air conditioning agent, or cooling by passing through a heat exchanger with cooled air, i.e. from a water bath, an additional liquid is used to additionally cool a gas or air. The cooled water originating from the respective 65 baths W and W 'is thus drawn off via a line 30 or 30' and returned through a line 31 or 31 '. The cooled fluid withdrawn can be in a heat exchanger

642 738

E can be used to cool additional air. If necessary, treatment water can be supplied through line 32 or 32 ', while each water bath can be drained via a drain pipe 33 or 33' connected to the bottom of the respective bath, the flow being regulated by a valve 34. The drain valve 34 is closed during normal operation.

When air flowing through each discharge line is discharged because e.g. The cooled air or cold water or other heat exchange liquid can be used due to excessive humidity. Since exhaust air or exhaust gases taken in via the inlet lines 10 and 10 'normally differ from other sources and are available in various ways after passing through the cooling system, it is appropriate to

that the water cooled in the respective baths W and W 'can be brought to different temperatures. The cooling effect is thus increased by passing treatment air through the warmer heat exchanger E and then through the cooler exchanger. In addition, the air which has been passed through the bath W and the air which has been passed through the bath W 'can have compatible properties, so that a mixture of these air, even at slightly different temperatures and slightly different relative humidities, nevertheless produce the desired cooling effect when it is introduced into a special room without causing any intolerance to people in this room.

The advantage of the double water bath for two air flows, which are used for the inflow of air for cooling the same or another room or for exiting into the atmosphere, results when the air supply to a line, e.g. the line 10, is taken from the area above a washing table, which can produce hot air with high humidity. The air supplied through line 10 'may also be from an area near the washing machine e.g. can be removed under this if the air can be colder and less humid. By directing the high humidity air through a water bath and the air from the other source through the other bath, considerable flexibility in arrangement can be achieved. The cold water outlet 30 or 30 'is connected to a pump 35 or 35'.

Each heat exchanger E usually has a series of turns 36 through which the liquid to be cooled is led from an inlet 37 to an outlet 38, each inlet 37 being connected to a pump 35 or 35 '. The turns 36 are first placed in an axially spaced position, then a stack 39 of a loose woven copper, aluminum or other material is placed between adjacent turns to also occupy the central space inside and outside of spaces without a turn. The winding structure is then compressed until the fabric 39 is deformed so that the surfaces of the turns are touched and thus have a greater tendency for heat to flow out between the fibers or threads of the fabric and the turns. The compressed tissue is held under pressure by the turns 36 and also by a screen 40 at each end. A conventional filter 41 can be located at the entrance of the heat exchanger E in order to prevent comminuted material from settling in the tissue of the heat exchanger.

The respective heat exchangers E are in guides ^ and 42 '. The cooled water outlet pipes 30 and 30 'may be connected to the upper ends of the respective turn 36, the lower end of the turn with the

Return pipe 31 or 31 'is connected to receive a counterflow in each respective heat exchanger. In addition, the current through the pipe 30 of cooled water flowing can be applied to the incoming water pipe 31 'for the 5 bath W', while the bath W is used as a pre-cooler for the bath W '. The then cooled water from the bath W 'can circulate from the pipe 30' through a heat exchanger to cool additional cooled air or the same air which was initially cooled by the heat exchanger in the io line. The water released from this heat exchanger can be introduced into the bath W via the line 31. In this way, maximum cooling can be obtained from the available energy.

Of course, the air supplied through line 10 to bath 15 W can have such a high humidity that after connection to the water bath, the humidity becomes so high that the air cannot be introduced directly into a room. However, this does not mean that when, for example, the guide 10 or 10 'initially inputs, the air 20 cannot absorb enough moisture to produce a cooling effect, but usually on the contrary, since the heated air is drier with the same amount of moisture per unit Air is less humid than air at a lower temperature. The heated air, e.g. from a washing machine, although it has a significant amount of moisture, can also absorb additional moisture up to the saturation point and lower the temperature of the bath against which it is directed.

One possible construction of a drain cap for the overflow pipe 25 (Figure 2) includes an inward stop 44 which is threaded on the inside so that it can be adjusted up and down on the pipe 25 and with a ring series of vertical holes 45 is provided, through which water can flow off when the water level 35 46 extends beyond the upper part of the stop 44. Usually the water level is inclined due to the impingement of air on water, so that the discharge height is made up of different heights around the cap. Normally, the water level 46 is held at the upper edge of the stop 44 so that no outflow takes place until the water rises. Although the tide and flow of water under the influence of the air flow slightly fluctuate the height 46, a general average height is maintained since the water edge in front of the pipe 25 is lower than the height 46 and the water edge behind the pipe 25, i.e. can be brought up to the corresponding side wall 12 'and above the height 46.

The device according to FIG. 3 serves the advantage of removing the heat contained in air and gases above the cooking installation 49, e.g. a grill or hotplate, and passing through a fat extraction fan with water contact means, e.g. according to U.S. Patent 2,841,062, in which the air is passed against a water bath at sufficient speed to create whirls of water and release the fat, smoke and other cooking substances, except perhaps carbon monoxide and toxic gases. The cooking system and the fat extraction fan V are located in front of a wall 50 with an insulating layer 60 to reduce the risk of fire. The air is forced against the water into a space 52 as it flows through the fan V by moving around the front lower edge of the guide plate 53 and presses the water against a curved back plate 54, then passes around a guide plate flange 65 55 for a similar purpose to that of the flange 28 around the guide plate 27 according to FIG. 1. After passing through the fat extraction fan V, exhaust air is passed through a coarse filter 58 e.g. made of glass fibers, what through a gate

45

642 738 6

59 happens, which is brought into the dashed line liquid heat exchanger and water evaporation. This air remains from the warm, cooling system C thus not only cleans the exhaust gases, but also what has been generated by the cooking system, and is also taken through heat for heating purposes, saving on a heat exchanger E *, which previously Heating energy as well as for cooling the exhaust gases to reduce

Written heat exchanger E * is similar, with pipe 5 likes of contamination. In the cooling system the windings and pressure against tissue made of copper or other gas is cooled at the same time as the water is cooled by means of steaming material or another construction, so that in turn the exhaust gases are cooled around the. This heat exchanger is to reduce the heat pollution with an inlet pipe 37, while the exhaust pipe and an outlet pipe 38 for the heat transfer liquid cooling of the room fresh air with very little additional speed, e.g. Water. The flow through the heat io operating costs takes place. As indicated, the waste air exchanger heats the still hot air, the heat exchanger E * supplied by the inlet 37 during cooling from the fat extraction valve V through and exiting from the outlet pipe 3 8, in order to prevent it from passing through. to create a counter flow. Pre-cool the heated passage through the cooling system C. The water thus returned or the other liquid is the heat recovered from the outlet pipe 38 for preheating water to an air heater serving as a heat exchanger for the heat exchanger, while the heated water is similar to E but with air for air conditioning the exchanger E * heated by the fat extraction fan to flow through and then precooling the waste air into the room to be heated before it is passed through. The cooling system C rising from the cooking system 49 can circulate and the entire cooling effect air or gas passes through the fan V and can be increased especially when the moist temperature is contaminated by cooking smells or the like, whereby it does not allow 20 air into the Cooling system C arrives. FIG. 5 shows three or heat exchangers Eb E2 and E3, which are not finally delivered to a room, each of which can be used for use. take heating water from the exchanger E * or

If cooling is desired, waste air and exhaust gases from cooling water from the cooling system C (FIG. 3) can be used. To go to the water heated by the heat exchanger E * for cooling the air, regulate the flow to the exchangers before flowing through the cooling system C, to the water 25 Eh E2 and E3 a valve 68 in the hot water supply water serves for evaporation and thus is supplied for cooling. Line 38 and a valve 69 in the hot water return line 37. The heat exchanger E1 and the cooling system C are in the same way a valve 70 in the cooling water view in one passage with a front wall 56 and a passage line 30 and a valve 71 in the cooling water return wall 57 and corresponding end walls. The width device 31 is provided, a measuring valve 72 being located in the front and rear wall depends on the width of the set water line 32. A cooking system and the respective number of heat exchangers pump 74 are fed from the inlet pipe 75, to which the hot water line 38 and the E and cooling systems C depend. With two cooling systems C, as are connected in the cooling water line 30. A shunt-fig. 4, via two grease extraction fans V and in-line flow valve 76, the water pressure at the pump lets one to four to six heat exchangers E1 under each cooling unit, while a check valve 77 a return publishers C, the outlet 38 of each exchanger can be 35 prevents. A pump drain pipe 78 leads into a head-end distributor 60 which is connected to a hot water section 79 around the respective heat exchangers Eb E2 and E3 device 61. Similarly, return lines 37 are connected to a head 62 with hot water or also with cooled water, which are connected to a return line 63, e.g. the worry. The inlet and outlet flows of each heat line 37 and 38 communicate, which are at manifold exchangers are regulated by valves 80 and 81, respectively. The parallel operation of several heat exchangers E (not 40 heat exchangers each contain a turn 36, in which air is shown) are connected. flows through the exchanger in the direction of arrow 82. The

The cooling system C according to FIG. 3 is in the function of the exchangers E], E2 and E3 can normally be the same at ver-according to FIG. 1, except for a single inlet and at different or remote locations as there are outlet for the same waste air and the same discharge air and be where the air emitted from everyone immediately or after a shared bath. The waste air flows into each side 45 almost directly into a floor wall 11 to be heated or cooled, and can be passed through baffles 19 and 19 '. One of these exchangers Eb E2 and E3 upright walls 18 and 18 'and into the water bath W can thus be provided in a separate room,

urges. The cross plates 19 and 19 'are provided with descending ones, e.g. in a wall, provided over a two guide plates 20 and 20 ', each of which to the respective slab ceiling or on a roof. Especially with wall 18 or 18 'on the lower edge. The water is 50 order on a roof or at another place, in which from each side leads against a central partition 24, a heat exchanger Eb E2 or E3 frost temperatures, whereby the air can then be on opposite sides of the base, if the turns the heat distribution 28 pulls up on each side. The air then passes exchanger to be provided with a drain valve, which is through the outlet guide 64, which lies with the upper part 65 of the half of the exchanger. A thermostat is set to connect the cooling system (Figure 4). The cooled water that the drain valve opens when, for example, one flows from the bottom 17 of the bath or container to a temperature of 0 ° C. The backflow from the distant heat exchanger and is carried out by the heat exchangers to a head piece 83, then the return line 31 is returned. As before, this leads through a pipe 84 and from there through the corresponding

Water treatment pipe 32 to a location in the middle of the return pipes 37 and 31, unless there is a storage tank in the respective bath and in a cap 26 to return the desired height to the return line 37 to the exchanger E. The front of the device is sealed by a cover 66 to prevent water from accumulating when there is a change in heat or by triggering. solution. The water bath in the cooling system C

The device according to FIG. 3 is also used to carry out acts as a storage tank under similar circumstances. In the derivation of a method according to the invention, in which the gases emitted from a device 64 for moving the air through the heat-boiling or similar system can not only be provided by conventional fans, while the Ge-to save Heat energy but also for saving blower for moving the air through the exchanger Eb E2 of blower energy is used. The passage of these exhaust gases and E3 are usually in the inlet to push the air through a degreasing fan V, a gas through one through the heat exchangers.

In operation, the heat exchanger E * not only supplies hot water or a fluid for heating the cold fresh air, but also cools the exhaust gases from the cooking system and thus reduces or eliminates the heat pollution effect of the kitchen exhaust system. The cooling system C also has the double function of not only supplying cooled water for warm fresh air, but also cooling the kitchen exhaust system and in turn reducing its heat pollution effect. In connection with the device according to FIG. 5, there should be an integrated air transmission system, which has several appropriately arranged fans for moving the air in one housing, e.g. from one area to another for pressure equalization of the entire building.

The heating and cooling control valves, i.e. valves 68, 69 and 70, 71 can be solenoid valves so that they can be controlled by a thermostat that responds to the need for heating or cooling. Valves 68 and 69 open when pump 74 is started and the thermostat there has recognized the need for heating. When this is no longer necessary, the pump 74 is stopped and the valves 68 and 69 close. In the same way, the valves 70 and 71 are opened automatically, the pump 74 is started when cooling is required, and the valves are closed or the pump is stopped when cooling is no longer necessary.

A special heat transfer medium can be pumped through the exchanger E *, but with regard to the probability at start and stop of the corresponding circuits that this medium is mixed with water from the cooling system, water is preferred as the heat exchange medium for the exchanger E *. If the outside temperature is very high or very low, the heating or cooling of heating or cooling systems can also be supplied.

The diagram according to FIG. 6 is similar to that according to FIG. 5, with corresponding parts bearing the same reference symbols. One difference is the delivery of either heating or cooling to one of the exchangers Eb E2 or E3 individually and less in a group. The hot water pipe 38 is thus connected to the inlet pipe 75 for the pump 74 without cooling water being supplied, so that the pump 74 feeds a distribution pipe 79 ′ for hot water alone through an outlet pipe 78, from which hot water to one or more of the heat exchangers Eb E2 or E3 is delivered by opening its corresponding intake valve.

The pump 74 can then be run or started when the inlet valve 80 is opened to return the previously heated water after circulation through the respective heat exchanger to the header 83 ', from which the return flow through the pipe 84 through the storage tank 85 and then through the Inlet pipe 37 is led to the winding of the exchanger E *. The cooling water pipe 37 from the cooling system C 'runs to an inlet line 75' for a pump 74. Shunt valves 76 and 76 'and check valves 77 and 77' have the same function for the pumps 74 and 74 'as the shunt valve 76 and the check valve 77 in the figure 5. The pump 74 'supplies cold water to the pump outlet pipe 78', which in turn is located on the cold water distribution pipe 87, from which cold water can be given to one or more selected heat exchangers Eb E2 or E3 by opening the inlet valve 80 ', the pump 74 'is started when the first valve 80' is opened or continues to run when another valve 80 'is open. The respective outlet valve 81 'is open and returns the water after circulation through the coil of the respective exchanger to the head piece, which has a return pipe 84' ver7 642 738

is bound, which, as described, is connected to a cooling water return line 31. Valves 68 through 72 operate as described.

FIG. 6 shows another return of the water to the cooling system C ′, which previously circulated in one or more heat exchangers Eb E2 or E3, including the changes in the design of the guide plates of the cooling system. The cooling system includes a floor plate 11 'upright and distributed walls 18 and 18' through which the air io through the baffles 19 and 19 'engages the water bath between the walls 18 and 18' on the floor 11 similar to the cooling system C. comes after Figure 3. The air also flows under the lower spouts of hanging flanges 20 and 20 "as previously described, but the central baffle plate 24 of Figure 3 is omitted. After rinsing the water bath and evaporating to cool, the air goes to either side under the cross baffle 27 and over each corner between a guide plate 19 or 19 'and the respective flange 20 or 20'. In addition, the return flow from the 20 heat exchangers Eb E2 or E3 goes from pipe 31 into a pipe 89, which is centered on the top of the guide plate 27 extending longitudinal distributor 90 is connected instead of being returned to the water bath through the pipe 31 as in the case of the cooling system according to Figure 3. A distributed row of nozzles 91 with a 90 ° rotation and for producing a horizontal, wing-shaped Spraying along and under the guide plate 27 lying above the guide plate 27 (FIG. 7) on the distributor 90. The lateral sprays from the nozzles 91 hit the flanges 92, ie e are located on every 30 edge of the guide plate 27, so that water striking the flanges drips or falls downward from the lower edges of a lower inwardly tapered spout 93 of each flange 92. The water dripping or falling forms a thin curtain of water through which the air or gas passes to evaporate some water and further cool the remaining water. A series of nozzles 91 are preferably arranged so that sprays from the area of the outlet guide 64 are directed 40 in opposite directions to the end of the cooling system, in order to avoid creating a water curtain on the guide and to reduce the amount of water that gets into the air and could be released into the atmosphere.

Such additional evaporation of water from the curtain is advantageous if the wet temperature of the air is not reached by stirring the water bath and maximum cooling is desired. In fact, the spray nozzles 91 can produce sufficiently divergent sprays directed into the area between the flanges 20 and 20 'and cover the area sufficiently to allow a large amount of air or gas to impinge on the water so sprayed. that the cross plate 27 can be omitted above the bath.

In use, the air passing through the heat exchangers 55 Eb E2 or E3 may only be part of the air circulating in the area to which it is supplied, e.g. into a room, since part of the air for this room is outside temperature. Normally, at least part of the incoming air should be outside air in order to keep an adequate supply of oxygen. There are times when the outside temperature is such that the fresh air does not need to be heated or cooled for one or more areas. However, if warming is required for special weather conditions, such as before or during frost, and the heat generated by the fat extraction fans is insufficient,

can additional heating such as bridging part of the fresh air through a conventional air heating oven either outside the fresh air or the fresh air that already

65

642 738

8th

passed through a heat exchanger Eb E2 or E3. Also, an auxiliary heater may provide additional warmth to the room or area through the additional warming from the air circulating from the area through the auxiliary heater and back to the area. The need for additional heating arises when the outside air temperature during bad weather is below a temperature which is determined by the heat available for the exchanger liquid at the exchanger. Similarly, additional cooling by mechanical cooling systems can be used during hot months when the outside temperature is high enough so that the cooling effect of the cold water supplied by the cooling system C or C 'does not produce sufficient cooling of the fresh air. This means that the need for additional cooling arises from the outside air temperature, which is above a temperature determined by the cooling, which results from the cooled water at the heat exchanger. This means that either the outside fresh air, which has already passed through a heat exchanger Eb E2 or E3, can be cooled by a conventional mechanical cooling system. Or an additional cooling system can cool the cooled water from the cooling system or cooling air from the room can circulate. Such an auxiliary heating system only requires 40% of the capacity required for heating the area without having the waste heat recovery system according to the invention, while the additional cooling system only requires 50% of the capacity which would be required for cooling the area without the cooling phase of the waste energy recovery system according to the invention. Each heat exchanger Eb E2 and E3 can represent several individual heat exchangers in a set or a row and more than three separately controlled areas can be supplied with heated or cooled fresh air.

The device according to FIG. 8 contains a modified top-mounted fat extraction fan or two fans for receiving heated air and gas from a cooking system similar to FIG. 3. This fan is provided with a water contact device with an outwardly inclined front wall 95 which runs upwards from the bottom 96 and on has a crimp 97 on its upper edge. A series of side panels 98 may be removably attached to the outside of wall 95 opposite openings for inspection and cleaning. Gases rising from the cooker go up around wall 95 and also to a back and down sloping bottom wall 99 of a room above the water contact device, with suction drawing the gases through a constriction between crimp 97 and a flange 100 extending from the wall 99 runs downwards at a greater angle to the horizontal and slopes away from the wall 95. The suction is generated by an exhaust fan at the end of a guide 64 'which is connected to the upper part of the housing H'. A plate 101 is adjustably attached to flange 100, which has a substantially vertical grommet 102 on its lower edge, the position of which is adjusted towards and away from the water bath, in a chamber between front wall 95, bottom 96, and rear wall 103 of the chamber and housing and corresponding end walls is included. When circulating around the bottom edge of spout 102, the gases are forced into engagement with the water bath to remove grease, smoke particles, and the like, the location of spout 102 normally being dependent on the volume of gas flow both under and between the spout and between Rear wall 103 depends. The gases also pass through a diverging constriction section between the plate 101 and a forwardly angled baffle 104 which leads upward and receives a horizontal baffle 105 which has a downwardly extending, moisture wiping spout 106 on its leading edge. The guide plate arrangement of the water contact device according to FIG. 8 seems to increase the washing effect over lower flow areas and 5 is more active during operation than the water contact device according to FIG. 3. The angle construction according to FIG. 8 is also less expensive to manufacture than the curved guide plate and the plate construction according to FIG 3. The water contact device according to Figure 8 is provided with an open upper part and an overflow box 107, which keeps the average water level in the bath within a desired range, while a discharge pipe 108 is connected to the box 107 and leads to a suitable installation point. The water chamber may be provided with a sump pump having a shielded entrance floor 96 at one end and delivering water from the chamber to a filter to remove grease and other particles and then returning to the water chamber.

20 When released from the constriction between lip 106 and wall 99, the gases expand into an overlying space, the rear of wall 103, the front of front wall 110, and the ends of respective end walls of the housing H 'be-25 is bounded to drop additional moisture. The front wall 110 may be provided with a laterally distributed row of removable access boards 111 at its lower end. An equal row of access boards and one or more intermediate access boards 113 are located at the top. The gases then pass through a filter 58, which has a removable handle 59 'for inspection and cleaning, and then into a heat exchanger E * of the type described. One or more exchangers E * can be located in the same fan, a 35 outlet of each being connected to a distributor 60 from which a pipe 61 extends and an inlet 37 each being connected to a distributor 62 which is connected by a pipe 63 is fed. A heat exchange liquid, usually water, which is heated and fed to a heat exchanger E which corresponds to the exchanger Eb E2 or E3 according to FIG. 5 is conveyed through the pipes 61 and 63 in the direction of the arrows.

After passing through the heat exchanger E *, the gases are drawn into a cooling system C ", which has a water bath 45" in a room above a floor 11 "and side walls 18" which are inclined outwards. The floor and side walls are double-walled with interposed insulation for The gases pass around the top of each side wall 18 "of the water chamber and are bent down by an inclined baffle 19" on each side. Each baffle is with a downward spout 20 ", which in turn is inclined downwards at a larger angle, but towards the center and less towards the side walls.

55 These guide plates and spouts bring the air into engagement with the water contained in the water chamber, the height of which is held by an overflow pipe 25 "which is connected to a drain pipe 26". The pipe 26 "leads into the ventilation water chamber next to the drain pipes 108 and 60 also serves another purpose, which will be described later, while fresh water for the cooling system can be introduced through a pipe 32 '. The gases which attack the water bath stir the bath and cause evaporation and also carry water droplets that try to evaporate thereon. When the gases expand into the area above the baffle plates 19 ", remaining water drops settle and fall onto the baffle plates where they are from the Drain the bottom edge of the flanges 20 "to allow the gases in

9

642 738

Intervention to come. When the cooling system is used for cooling purposes, the returning water is fed from a pipe 89 'to a horizontal manifold 90 ", on the underside of which a plurality of nozzles 91" are attached, from which water enters the opening between the flanges 20 "for further attack the gases flowing up between the flanges are sprayed down, causing the water sprays to evaporate and cool further, which then drip into a water bath, thereby lowering its temperature.

The chilled water from the refrigeration system collects in a box 115 which is inserted into the bottom 11 "and directed downwardly therefrom for connection to a pipe 116 which leads to a manifold connected in the pipe 61 for a dual purpose. If the cooling system comes into use for the first time and cooling water is distributed to the heat exchange device, for example corresponding to the exchangers Ei, E2 and / or E3, cooled water is led from the cooling system C "through the same pipeline which is connected to the heat exchanger E * is what simplifies piping. In addition, when the cooling system is not in operation and no water is returned through pipe 89 'but is pumped from heat exchangers E through pipe 61 to a point of use and then returned through pipe 63, very little water will circulate from the cooling system , since the water flowing back through the pipe 63 presses the water to be heated through the exchanger E into the pipe 61. The connection to the box 115 of the cooling system, however, prevents the accumulation of air in the pipe 61 when there is a switchover from the exchangers E * to the cooling system C "or vice versa, and thus acts similarly to the storage tank 85 according to FIG. 6.

According to FIGS. 8 and 9, the pipe 116 runs forward from the box 115, while the drain pipe 26 "leads from the overflow pipe 25" to the rear. Another drain pipe 118 connects a point next to the box floor to the drain pipe 26 ", with a manual valve 119 turned on to drain the cooling system C" when there is water in the cooling system not in use under extreme weather conditions freezing threatens and the cooling system is exposed to these conditions. The valve 119 is accessible via a removable board 113. If the fan's water chamber is to be emptied for this purpose, the sump pump mentioned can be used, the pump outlet being connected to a drain.

FIG. 10 shows an arrangement for regulating the optional heating of the fresh air from the heat exchangers E * in each of the two fans or cooling the fresh air by means of cooled water from the cooling system C ". This arrangement contains the connection of the pipe 61 to a pump 74 'which corresponds to the function of the pump 74 according to FIG. 5, but supplies hot water for the heat exchangers E 's as for a set of exchangers E in each of the two fans when the fluid of the exchanger, for example water to the exchanger E *, through the pipe 63. Pump 74 'draws chilled water from box 115, pipes 116, and manifold IO 117 when the reflux is blocked by pipe 63. In any event, the heat exchange fluid, usually water, is passed through a pipe 78 'supplied to a heat exchanger for use, such as heating or cooling the fresh air. A return pipe 84' from the removed heat exchanger leads to a three-way valve 120, the inlet of which lies on the pipe 84 'and the other outlets of which are connected to the pipe 63 or a pipe 31'. The valve 120 may be a solenoid valve that is actuated by a push button assembly in a suitable location, e.g. is operated on the fan controllers 20. If one outlet of the three-way valve 120 is on the pipe 63, the backflow pipe 84 'leads to the heat exchanger E. However, if the other outlet of the valve 120 is on the pipe 31', the backflow leads instead through the pipes 89 ', the manifolds 90' and that Nozzles 91 '. A simple change can thus result in a suitable arrangement similar to that according to FIG. 10 for regulating a single fan with a plurality of heat exchangers E but a single cooling system C '.

Although the use of waste energy from cooking facilities 30 by air passing through a grease extraction fan has been illustrated and described, and the use of waste energy from air taken above and below a washing facility has been heated, other sources can of course also be used. For example, the heat contained in heated air that has been extracted from the upper part of a large room such as a theater, auditorium, meeting hall or the like can be used to heat or preheat incoming fresh air when the outside temperature is lower than that, to be kept in the room. If the outside temperature is higher than that to be maintained in the room, air from the upper part of the room can be passed through a cooling system to receive water for cooling the fresh air in a special heat exchanger.

45 Although various exemplary embodiments of the invention and certain changes to it have been illustrated and described, there are also other examples and modifications without departing from the spirit and scope of the invention.

C.

5 sheets of drawings