SE528281C2 - Heat - Google Patents

Abstract

A heat exchanger (11) includes a heat-exchanger housing (VH) having an upper delimiting surface (12) and a lower delimiting surface (13) and provided with a secondary medium inlet (16) and a secondary medium outlet (17), and a heat exchanger pack (VP) which is fully enclosed in the housing and which includes a primary medium inlet (14) and a primary medium outlet (15), wherein the heat exchanger pack (VP) is provided with N-number of sections of heat exchange elements (31 , 32, 33), and wherein the upper delimiting surface (12) of the heat- exchanger housing (VH) arches over each section of heat exchange elements (31 , 32, 33) with the highest level of the arch being located centrally above respective sections.

Description

Yet another object of the invention is to provide a heat exchanger with an invention which helps to keep the interior of the heat exchanger free of dirt particles.

In addition, the object of the invention is that the heat exchanger shall constitute an economically and also environmentally advantageous investment for a longer use in the ordinary households.

Summary of the Invention By the present invention as set forth in the independent claim, the above object is fulfilled. Suitable embodiments of the invention are set out in the dependent claims.

The invention refers to a heat exchanger for e.g. water as a medium which can then be placed under a shower tray. In this application, the heat exchanger uses the energy in the shower's wastewater / wastewater to heat cold water that goes to the shower.

The heat exchanger consists of a heat exchanger housing, in the form of a box, containing a heat exchanger package designed with N sections of exchanger elements which in turn consist of a number of plate or lamella-like channels for transporting primary medium. exv. cold water led to the shower mixer. The function of the channels is to absorb the heat from the secondary media that is conducted around the primary media channels. To utilize the secondary medium, e.g. of the wastewater, heat energy maximum, the secondary medium is led in a meander-like manner through fl your g exchanger sections, where the secondary medium in each section flows fl your parallel plate-like primary media channels with primary medium. In the embodiments shown, N = 3, i.e. the heat exchanger package consists of three sections of exchanger elements. In other conceivable embodiments, N may be 1 s N s 10 or more.

The heat exchanger has up to 65% power with minimal soiling inside the heat exchanger housing. Dirt has, in experiments, proved to be the biggest problem with the proper functioning of the heat exchanger in that it has also caused clogging of the same. To remedy these soiling and clogging problems, the inlet and outlet of the heat exchanger housing are located at the highest possible point in an exchanger section. In this way, the dirt particles that fl surface on top of the liquid are automatically flushed out and thus the heat exchanger housing is kept clean.

When e.g. After a shower has been completed, the dirt particles which are lighter than water and which are present in the remaining waste water in the heat exchanger rise up to the surface 20 in 30 528 281 3 in inlet and outlet and are flushed away when the next showering begins. The house is always filled with water. To further facilitate the dirt to travel through and out of the heat exchanger housing, the roof, ie. its upper limiting surface, over each section formed with an arcuate shape whose highest level is located in the middle of each section of the heat exchanger housing. Thus, the roof over each section is formed into a convex channel that follows the wastewater channel to its outlet, ie. the dirt travels on the surface of the wastewater into the narrower convex space. In this case, the dirt is pushed out by the air bubbles that enter the heat exchanger during the next shower. Before the wastewater inlet, there is a heavy particle trap in the form of a T-pipe where metal chips and heavy particles fall down and do not follow the water into the house.

There are two different fl fates of water in to and then out of the friend exchange housing. Secondary medium, or wastewater, which is hot and contains heat energy to be recovered and then primary medium, or cold water, which is to be heated by passing the heat exchanger and then led to the shower by the countercurrent principle. The secondary medium is led through channels that are built into the heat exchanger housing and in this way it has time to emit sufficient heat energy through contact with the primary media channels before it leaves the housing. Primary media ducts, each of which consists of two joined plates to rectangular plate-like ducts, lead cold water through the heat exchanger housing. During this flow, cold water has time to absorb the heat energy of the wastewater that is found around the primary medium channels / cold water channels.

Each cold water channel comprises two bulging stainless metal inks / metal plates which are joined together and thus form a water channel between them. Cold water that passes through the cold water ducts in the heat exchanger housing, which is filled with the approximately 35 degree waste water, has time to be heated when the metal plates have a higher temperature than cold water. This heat exchange process can save up to 65% hot water in the shower.

Two results of using the present invention are, first, that a greater portion of the wastewater energy is recovered from a shower. This means that the wastewater's heat energy from a shower tray is used to heat cold water that is to go to the shower. Secondly, the advantage of using this invention is that the wastewater temperature is significantly reduced and thus the opportunities for growth of highly active bacteria in sewage pipes that can lead to e.g. stops in local but also in municipal sewers. 10 20 25 30 528 281 Brief description of the drawings The invention will now be described in more detail with the aid of exemplary embodiments with reference to the accompanying drawings where, fi figure 1 shows a perspective view of a heat exchanger according to an embodiment of the invention, 2 figure 2 shows a top view of the heat exchanger in fi g. Figure 3 shows a perspective view of a heat exchanger package according to the invention, Figure 4 shows a top view of the heat exchanger in Figure 1. 2 with the upper limiting surface removed, 5 gur 5a shows a sit A - A through the heat exchanger according to fi g. Figure 2b shows a section of a part of a second embodiment of the invention, Figure 6 shows a side view of the heat exchanger with inlet means and outlet means.

Description of the invention Figure 1 shows a heat exchanger 11 comprising an upper limiting surface 12 and a lower limiting surface 13 which surfaces in the embodiment shown are joined together and form a heat exchanger housing VH. The heat exchanger housing is provided with a primary media inlet 14 and a primary media outlet 15. Furthermore, the heat exchanger housing is provided with a secondary media inlet 16 and a secondary media outlet 17. The heat exchanger thus operates according to the countercurrent principle where the primary media direction is marked with P and secondary with the heat exchanger is provided with a first drain 18 and a second drain 19 both intended for emptying the heat exchanger.

Figure 2 shows the heat exchanger from above, the upper limiting surface 12 being divided into three parallel surface sections 21, 22, 23. Each surface section is elongated in a direction which coincides with the flow direction of the secondary medium inside the heat exchanger. Furthermore, the secondary medium inlet / outlet of the heat exchanger housing is arranged at the highest level of the upper limiting surface 12 in the housing so that any surface particles of the secondary member should reach the outlet for removal in use.

Figure 3 shows a heat exchanger package VP made up of three exchanger elements 31, 32, 33 of which the third exchanger element 33 is provided with a first connection A1 to the primary medium inlet and the first exchanger element 31 is provided with a second connection A2 to the primary medium outlet. Each exchanger element is built up of eleven parallel lamellae L in which primary medium is arranged to flow. All lamellae L in an exchanger element are connected in flow, partly to a common input 1 and to a common output U so that the first exchanger element 31 is provided with an input 311 and an output 31 U. Correspondingly, the second exchanger element 32 provided with an input 32l and an output 32U and the third exchanger element an input 33l and an output 33U. Each of the three exchanger elements is connected at its end to an adjacent element in such a way that the output 33U of the third exchanger element 33 is connected to the input 321 of the second exchanger element 32; the output 32U of the second exchanger element 32 is connected to the input 311 of the first exchanger element 31 so that the primary ground current flows through the three exchanger elements of the heat exchanger package VP in a meander-like manner.

As further shown in Fig. 3, a first partition wall 35 is arranged between the first exchanger element 31 and the second exchanger element 32 and a second partition wall 36 is arranged between the second exchanger element 32 and the third exchanger element 33. Each partition wall is in its free end provided with a curvature K for the purpose of facilitating changes of direction of the flow for an overflowing secondary medium.

Figure 4 shows the heat exchanger package VP mounted in the heat exchanger housing in its lower limiting surface 13. The partitions 35, 36 are designed to connect to both the lower limiting surface 13 and the upper limiting surface and to cooperate with six holders 41 in the heat exchanger housing. and the exchanger elements. The free end of the partitions with the curvature connects to the heat exchanger housing while its opposite end is attached to a media connector 43 between two adjacent exchanger elements. In addition, the connection A1 of the third exchanger element 33 is connected to the counter-primary inlet 14 and the connection A2 of the first exchanger element 31 is connected to the primary media outlet 15.

Figure 5a shows in magnification a section A - A through the heat exchanger according to figure 2, the secondary medium outlet 17 being shown partly externally and internally, the outlet being positioned so that secondary medium from the highest level of the heat exchanger housing VH has free access to the outlet, ie. no edge from the heat exchanger housing should impede the horizontal flow of the medium along the inside of the upper limiting surface of the housing to the secondary media outlet 17. Furthermore, the primary media inlet 14 is partially hidden behind the first drain 18. The heat exchanger second side shows the second drain 19 partially hidden by the primary media outlet 15. the changer elements 31, 32, 33 constructed of slats L 20 30 528 281 6 and the media connector 43 between the second and the third changer element 32, 33. The number of slats in each section of the changer element is K, where 5 s K s 15. l the the embodiments are K = 11. As previously mentioned, the upper limiting surface 12 of the heat exchanger housing VH is divided into three parallel surface sections 21, 22, 23, each formed with an upwardly / outwardly curving arcuate shape so that the highest level of the limiting surface 12 is located in the middle of each section of exchanger elements. The largest distance between the upper extent of the slats and the upper limiting surface 12 is X mm, where 6 s X s 12 at the respective section. The heat exchanger package for each section is mounted in the heat exchanger housing at a distance Y mm, where 2 s Y s 5, from the lower limiting surface 13 of the heat exchanger housing VH in the middle below each section. In the i fi g. 5a, the lower boundary surface is completely flat below the sections, i.e. the exchange elements 31, 32, 33, but also other embodiments are conceivable within the scope of the present invention, namely that also the lower limiting surface 13 is correspondingly arcuately curved downwards under each section.

Figure 5b shows just such a modification of the lower limiting surface 13, i.e. that the surface has been given an arcuate shape with the largest distance to the slats L in the middle under each exchanger element 31, 32, 33. The exchanger element of the exchanger package for each section is in this modification mounted in the heat exchanger housing VH with a maximum distance Z mm, where 6 s Z s 12, from the lower limiting surface 13 of the heat exchanger housing VH in the middle of each section.

Figure 6 shows a side heat exchanger according to the invention in which its secondary downstream inlet 16 is provided with an inlet device 61 with a tongue particle trap 62. Furthermore, the heat exchanger secondary outlet 17 is provided with an outlet device 63 comprising a liquid lock 64 so that the heat exchanger does not push or flow through the exchanger. The figure also shows the primary media inlet 14 and the first drainage 18 along the long side of the heat exchanger. It can also be seen from the att guren that the upper limiting surface 12 and the lower limiting surface 13 are shell-shaped, these two surfaces being joined together along a dividing seam 65 around the entire heat exchanger to form the heat exchanger housing. Designs on the heat exchanger housing other than the one shown also fit within the scope of the invention.

The function and design of the heat exchanger in an application as a shower heat exchanger is that the heat exchanger consists of a drawer placed under the floor of the shower / bath, where the secondary medium consists of the waste water from the shower / bath which is led through this drawer to the floor drain . The cold water duct, which is normally connected to the shower fitting, is connected to the primary media inlet of the box, whereby cold water passes through the heat exchanger package to its primary media outlet and further to the cold water connection of the shower fittings. Because the wastewater / wastewater flows around the heat exchanger package and its lamellae in which cold water flows, the cold water to the shower fitting will be aggravated by the approximately 35-degree wastewater in the box. The heat exchanger housing also has self-cleaning properties in that the location of the inlet and the outlet for the secondary medium, e.g. the wastewater, has been selected at the highest possible point of the drawer. In this case, the heat exchanger has become almost completely maintenance-free. In the shower application of the heat exchanger, the water flow through the heat exchanger's cold water channels (lamellae) has been taken into account, ie through the heat exchanger package. In this case, the distance between the slats has been adjusted depending on the heat. the flow rate of the exchanger to prevent dirt particles from getting stuck there. The free passage between, above and below the slats allows dirt particles to pass easily between the secondary media inlet and the secondary lower outlet without getting stuck on either the surfaces of the heat exchanger housing or the slats on their way through the exchanger and out into the conventional drain.

All channels for liquid transport and all other parts of the heat exchanger are made of a corrosion-free material to maintain a smooth surface for the liquid flow. The outwardly curved convex shape of the upper boundary surface along the secondary channel facilitates the movement of the dirt particles through the heat exchanger.

By choosing a thinner material for the manufacture of the slats than for the heat exchanger housing, this creates extra space to get more power out of the heat exchanger compared to the small space it takes up. The thin material for the slats has created extra space so that such slats can fit in the same section and thus in the same gear package. This has created higher efficiency while maintaining primary media flow. The energy exchange has also been expanded thanks to this property.

In the heat exchanger's secondary media resp. outlet located on the upper boundary surface is rotatable. This facilitates installation of the heat exchanger in small spaces, e.g. under a shower tray. i 10 20 25 30 528 281 8. Since the heat exchanger is always full of liquid by being equipped with a liquid lock and liquid in the exchanger has had time to get a temperature corresponding to the environment, e.g. about 20 degrees for the shower application, you can already from the beginning of a liquid flow get heat exchange inside the exchanger.

For example, for the application of water as a medium in a shower application, the inlet and outlet of the wastewater are placed at the highest point of the box. This is because dirt particles such as soap, skin residues, etc. in the wastewater rise upwards during the shower and follow out of the box through the outlet. If the outlet had been placed lower on the drawer, the contaminants would remain in the drawer and have minimal opportunity to follow the wastewater out and then the drawer would sludge again or require disassembly and cleaning of the drawer at regular intervals. If you instead have a design of the drawer that leads the wastewater out through the lid (highest point on the drawer), you get an automatic cleaning of the drawer. Even after the shower is over, the dirt in the remaining water rises and stays at the highest point of the water, ie. at inlet and outlet. The drawer is always filled with water so that the dirt in the wastewater cannot dry out. At the same time, a water trap mechanism is obtained that prevents odor emissions and replaces a possible water trap in the shower tray.

The box's relatively low water volume, approx. 7 liters, entails i.a. the advantages that the last rinsing water after showering with the soap has time to be rinsed out of the drawer before you finish showering. The wastewater that remains in the box after a shower is quite clean water. The maximum effect of the box is achieved quite quickly thanks to the small amount of hot water needed for a water change in the box.

A contributing factor to the cleaning effect of the heat exchanger is the wide convex shape on the inside of the upper boundary surface that follows the secondary media flow from inlet to outlet. All dirt collects on the highest point of the underside and is taken out of the heat exchanger. The dirt particles that remain after the cessation of the secondary media flow are carried out at the beginning of the next secondary media flow by the liquid bubbles entering through the secondary media inlet.

To get energy out of the drawer immediately when you start showering, the drawer is filled with waste water that maintains the lowest room temperature.

A heavy particle trap in the form of a T-tube is connected before the secondary media inlet where metal chips and heavy particles fall down and thereby are prevented from entering the heat exchanger. 528 281 9 The entire heat exchanger is made of acid-resistant steel and can therefore be cleaned with any cleaning agent.

Claims (10)

20 25 30 528 281 10 PATENT REQUIREMENTS A heat exchanger (11) comprising a heat exchanger housing (VH) having an upper limiting surface (12) and a lower limiting surface (13), an inlet (16) arranged in the housing for a secondary medium and an outlet (17) arranged in the housing for said secondary medium, a heat exchanger package (VP) completely enclosed in the housing with an inlet (14) and an outlet (15) for a primary medium, which heat exchanger package (VP) is arranged with N sections of exchanger elements (31, 32, 33). ) each section consisting of K, where 5 s K s 15 pieces of elongated parallel platform primary media channels (L) which at their ends are connected either through a transfer channel (43) for connection to the adjacent section or connected to inlets / outlet (14, 15) for introduction / export of primary medium to / from the heat exchanger package (VP), characterized in that the upper limiting surface (12) of the heat exchanger housing (VH) over each section of exchanger elements (31, 32, 33) is formed with an arcuate shape whose highest level is located opposite respective section and that the inlet (16) of the secondary medium is located at the highest level of the arcuate upper boundary surface (12) of the first section and that the outlet (17) of the secondary medium is located at the highest, nth, arcuate upper boundary surface (12) of the section level. Heat exchanger according to claim 1, characterized in that the heat exchanger package (VP) for each section N is mounted in the heat exchanger housing (VH) in connection with a flat lower boundary surface (13) with a distance Y mm, where 2 s Y s 5, from the lower boundary surface (13). Heat exchanger according to claim 1, characterized in that the heat exchanger package (VP) for each section N is mounted in the heat exchanger housing (VH) in connection with an arcuate lower limiting surface (13) with a maximum distance Z mm, where 6 s Z s 12, from the lower boundary surface (13). Heat exchanger according to claim 3, characterized in that the lower limiting surface (13) of the heat exchanger housing (VH) below each section is formed with an arcuate form whose lowest level is located in the middle of each section. 20 25 528 281 11 Heat exchanger according to one of Claims 1 to 4, characterized in that the heat exchanger package (VP) for each section N is mounted in the heat exchanger housing (VH) with a maximum distance of X mm, where 6 s X s 12, from the heat exchanger housing (VH). upper boundary surface (12) at each section. Heat exchanger according to any one of claims 1-5, characterized in that the heat exchanger housing (VH) is divided into N spaces which are delimited from each other by partitions (35, 36) which are connected to the inner surfaces of the heat exchanger housing (VH) along three of their side edges to form a meander-shaped secondary media channel through the heat exchanger (11), a section of the heat exchanger package (VP) being located in each space. Heat exchanger according to one of Claims 1 to 6, characterized in that an inlet device (61) is provided with a tongue particle trap (62) connected to the secondary inlet (16). Heat exchanger according to one of Claims 1 to 7, characterized in that an outlet device (64) is provided with a liquid lock (64) arranged at the secondary outlet (17) so that the heat exchanger is permanently filled with secondary medium. Heat exchanger according to one of Claims 1 to 8, characterized in that both the primary medium and the secondary medium consist of water. Heat exchanger according to any one of claims 1-9, characterized in that the secondary medium consists of waste water from a shower and that the primary medium consists of cold water for said shower.