DE102010007726A1 - Heat exchanger arrangement for use in e.g. sewage system in building, has adjusting piece comprising inner wall with shape adapted to cover surface of sewage line segment, so that piece lies at circumferential part of segment - Google Patents

Abstract

The arrangement has an adjusting piece for transferring heat energy of a sewage medium to a heat carrier medium, which is provided in the adjusting piece. The sewage medium flows through a sewage line segment (1). The adjusting piece comprises an inner wall (3), which is pointed towards the segment, and an outer wall (4) forming a cross-section of the piece. Shape of the inner wall is adapted to a cover surface of the segment, so that the piece approximately lies at a circumferential part of the segment and is fixed at the segment. An independent claim is also included for a method for operating a heat exchanger arrangement.

Description

The The invention relates to a heat exchanger assembly comprising a sewage pipe segment that can be introduced into a sewer system with a fitting for the transmission of heat energy a flowing through the sewer segment sewer to a heat transfer medium located in the fitting, according to the preamble of claim 1 and a Method for operating a heat exchanger assembly according to the preamble of claim 11.

sewage is basically a waste product, which with an energetic potential for further use for Heat extraction processes is equipped.

It There are a variety of methods that are based on the Wastewater heat from the sewage in the channel over Remove heat exchanger systems.

made more effective will use if heat exchanger systems directly at Waste water producers are installed. This can be used in industrial, commercial and domestic sewage systems possible be. Decisive here are the accumulating waste water quantities and the existing wastewater temperature.

proposals for heat exchanger systems in sewage plants in Buildings are in a considerable number in front. A large-scale application of such systems but so far has been missing.

So be in the industrial sector or in the area of hospitals and swimming pools, so areas with a continuous Hot water use heat exchanger systems consisting of heat exchanger elements, which are used in large containers exist. Here, the so-called gray water heat is extracted and for preheating primarily process or Used industrial water. Examples are the systems the FORSTNER storage technology, from FEKA or the rotary heat exchangers PROTEC, mainly in laundries, dyers and used in wastewater-intensive industrial areas.

For The use in residential buildings also exists a variety of systems.

Known Approaches have the disadvantage that they are often very high Have space requirements, foreign energy is needed and the facilities very maintenance intensive. These systems often require high investment costs, which does not pay for itself even after years.

at Most heat exchanger arrangements are a separation required by gray and black water, so fäkalalienhaltiges Wastewater is almost always excluded for heat recovery. Even greywater, however, is the direct use of the won Wastewater heat in Germany only conditionally and under installation suitable for separation systems.

According to DIN 1988 DVGW-TRWI . EN 1717 and EN 806 Technical rules for drinking water installations must be strictly prevented contamination of the drinking water by sucking back, refluxing or pushing back non-drinking water.

in the The following may be mentioned prior art, according to which Teaching on heat recovery from wastewater in buildings Container can be used. In these containers Heat exchanger systems are installed, which consume a considerable amount of space exhibit. Generally with these systems the heat energy drawn from service water, d. H. only greywater is used and no sewage contaminated with feces. The feed of the recovered heat energy takes place in most cases directly into the cold water circuit to preheat it. This is without a functioning separation system with gray and black water not possible in Germany.

Such systems are for example in the writings WO 03/074941 A1 . DE 32 44 600 A1 . DE 31 19855 C2 . DE 41 35 560 A1 . AT 412 293 B and DE 34 40 983 A1 described.

In the published patent application DE 44 35 869 A1 a heat exchanger is disclosed which consists of a plurality of parallel hollow plates and is arranged in a housing. Again, the heat of faecal free wastewater (service water) is withdrawn.

From the EP 0 414 769 B1 a heat exchanger is known, which is connected to a water discharge line and having a water separator. There, too, the energy contained in greywater is used. The structure is very complex and appears very maintenance intensive.

According to the teaching DE 42 02 791 A1 a heat exchanger for sewage pipe and hose lines is described with a coil for the passage of hot water. This arrangement should be able to be connected to the outlet of a washbasin, a bathtub or a shower cup.

The revelation after DE 198 46 515 C2 relates to a water installation with a consumption point and a heat exchanger for preheating the inflowing water. This is directly at the place of occurrence the wastewater (gray water), such as a wash basin siphon, made the heat exchange and fed the heated water to the drinking water cycle.

In the published patent application DE 10 2008 017 380 A1 is a heat exchanger in the form of a double-walled pipe, with waterproof interconnected inner and outer tube, described for installation in sewers. There, too, a direct feed of the heat gained by the heat exchange into the cold water line and the required hot water to be preheated to minimize the energy consumption of boiler, or water heater. For economic use, a full filling of the sewer pipe should be ensured as far as possible. This is a problem in normal operation.

to Increasing the effectiveness is the series switching provided by several double-walled tubes. It should also be through the use of common sewage pipe bends possible, this system to any space To put together a shape. These bows can be at Fear of blockages with revision openings be provided. Such a device is due to the installation of bows very maintenance-consuming. Also the vent This system is difficult in such a case. Due to the construction of pipe bends may be in this System only service water (gray water) passed through the device become.

Another disadvantage of the described heat exchanger after DE 10 2008 017 380 A1 is that it is a "complete system" and the purchase of such a device is associated with high costs. Due to the design of the double pipe, a subsequent installation of the heat exchanger is relatively difficult, as this must be intervened in the existing sewer system. The sewage pipes must first be sealed off, a relatively large opening must be created and then connected watertight to the double pipe.

Out the above, it is therefore an object of the present invention an improved heat exchanger assembly for use in or to provide a sewer system, which cost can be realized and especially for the subsequent Installation in an existing sewer system well suited is. Furthermore, it is the object of the invention to provide a heat exchanger arrangement which are both for use in a greywater sewer system as well as in a blackwater sewage system is designed.

The Solution of the object of the invention is carried out by a heat exchanger assembly according to the feature combination according to claim 1, and a method of operating such a heat exchanger assembly according to the teaching of claim 11, wherein the dependent claims represent at least expedient refinements and developments.

The Heat exchanger assembly includes a in a sewer system insertable sewer segment with a fitting to transfer the heat energy of a through the Sewer line segment flowing wastewater to a located in the fitting heat transfer medium. The fitting has a to the sewer segment facing inner wall and a cross section of the fitting piece forming outer wall on.

According to the invention the shape of the inner wall of the fitting piece to the lateral surface adapted to the sewer line segment so that the fitting piece Approximating on a partial circumference of the sewer line segment is applied. Furthermore, the fitting piece can be attached to the sewer line segment.

at The wastewater medium can be greywater or black water act, meanwhile, as a heat transfer medium preferably water and / or propylene glycol are used.

at the drainage segment which can be introduced into the sewer system it is preferably an already existing part of the Drainage system, so a simple subsequent Installation of the heat exchanger assembly can be done. Possible here is the integration of a vertical one as well as a horizontal section of a sewer system.

Provided a new installation regarding the sewer system and the heat exchanger assembly z. B. in the context of a new building should be done, the sewer segment is to be designed in such a way that an optimal energy transfer between the wastewater medium and the heat transfer medium can take place.

The Fitting piece is as explained approximating a partial extent of the sewer line segment, wherein the partial circumference preferably between ¼ and ¾ of the sewerage segment can amount. The proportion of the scope to be encompassed is to be chosen such that both a good heat transfer as well as a quick and easy attachment of the fitting piece can be done to the sewer line segment.

by virtue of the approximating concern of the fitting piece, so one almost complete concern of the inner wall on the sewer segment, however, the fitting not necessarily have to be made so accurate that a 100% complete concern to the segment is met, can prefabricated fittings on commonly used Drain lines are fixed.

It is an advantage, a variation of fitting pieces available which corresponds to the common diameters of drains or lines correspond.

In In a particularly preferred embodiment, the fitting is detachably frictionally connected to the sewer line segment and attachable without tools. This can be done, for example, by simple Slide on or click on the fitting piece.

To the this can be realized by fitting the fitting made of a flexible material to slide on to allow the sewer segment. On the other hand It is conceivable that the fitting from at least two means Joint, for example a hinge, each connected to an interior and Outside wall having parts.

There the majority of sewer pipes are tubular is configured, has the inner wall of the fitting preferably a crescent shape. The outer wall The fitting can be in any geometry and above all be shaped so that a simple and space-saving installation can be done. Consequently, a suitable also in the outer wall sickle-shaped design.

The Inner wall together with the outer wall forms the cross section of the fitting piece. The execution of the two walls in crescent shape results in a crescent-shaped or crescent-shaped cross section. The fitting is therefore eccentric to the sewer segment appropriate.

Perpendicular to the flow direction of the heat transfer or heat exchange medium has the fitting on closure elements, which with the Inner and outer wall of the fitting gas-tight and watertight are connected. The shape of the end elements corresponds to the cross section of the fitting piece and is attached to the two walls, for example welded or soldered. The two at one Match piece attached end elements point each a connection piece on.

With Help the connecting piece is the connection of the fitting and the heat transfer medium therein to a circuit, a heat pump cycle in which the heat transfer medium circulates.

Around Perform repair work and certain procedures to be able to, the sewer segment at least a shut-off on. Preferably, two shut-off devices provided, which at the respective ends of the sewer line segment are located. The shut-off device may for example in the form of a Slider be realized.

Furthermore can in the sewer line segment at least one solids separator be provided.

There the sewage medium is gray and black water can, and thus by the sewer segment also coarser particles This is on its inner surface preferably provided with a self-cleaning layer. A Such layer may also be on the inside and / or Outer wall of the fitting on the with the heat transfer medium be provided in contact surface. by virtue of the coating are in the present heat exchanger arrangement on the one hand less maintenance necessary and on the other hand the desired use of black water as the heat transfer medium allows.

to Control of procedures for optimal transmission By heat, the fitting can be a temperature sensor for determining the temperature of the heat transfer medium exhibit. Furthermore, there is a temperature sensor in the sewer segment intended to determine the temperature of the wastewater medium. Additional temperature sensors can in the sewer system in front of the entrance area of the waste water medium in the sewer segment for the determination of Temperature of the wastewater medium may be appropriate.

With Help of the mentioned temperature sensor is for example following functional sequence with respect to the heat exchanger assembly conceivable.

The sewer segment can be supplied by opening two located at the respective ends of the sewer line shut-off sewer subsequent effluent medium. This can be completed or stowed by closing the shut-off devices within the sewer segment. Opening or closing of the shut-off devices is based on a comparison of the temperature of the wastewater medium in the sewer line segment with the temperature upstream of the inlet region of the waste water Sermediums made dependent on the sewer line segment, wherein the actuation of the shut-off device takes place upon detection of a temperature increase or decrease in temperature by inflowing wastewater medium.

The In the heat cycle located heat pump, we prefer then put into operation while the two at the respective Ends of the sewer line located shut-off devices are closed, and the temperature of the heat transfer medium higher or equal to the temperature of the waste water medium in the Sewer line segment is.

It It should be mentioned that both the heat pump and the shut-off devices can be manually operated.

In terms of the operation of several inventive heat exchanger assemblies it is conceivable, heat exchanger assemblies in series or operate in parallel to ensure the highest possible heat recovery to reach from the sewage medium.

at the teaching according to the invention is summarized to a wastewater heat exchanger system, which in sewers (black water or gray water) can be installed and that the normal drain of the wastewater is not affected or impeded. This system can as a single component, or installed in series or parallel connection become. The heat exchanger chamber system in this system allows a liquid medium in the wastewater absorb heat energy and over a heat pump ready for the treatment of warm water to deliver. The system is with commercially available components producible, easy to assemble and mostly maintenance-free.

The described heat exchanger assembly relates to a system which can be retrofitted or reinstalled in industrial, commercial or domestic wastewater treatment is suitable and installed there in horizontal and vertical sewers can be.

The Invention will be described below with reference to an embodiment and explained in more detail with the aid of figures become.

It demonstrate:

1 a front view of a heat exchanger assembly according to the invention and

2 a plan view of a heat exchanger assembly according to the invention.

As in 1 is shown on a sewer line segment 1 a fitting piece 2 appropriate. The sewer segment 1 in the case shown is part of an already existing sewer system. The sewer segment 1 and the fitting piece 2 represent in combination a heat exchanger assembly.

Through the sewer segment 1 flows a wastewater, such as gray or black water, whereas in the fitting piece 2 a heat transfer medium is located or flows. As the heat transfer medium, water and / or propylene glycol can be used.

The fitting piece 2 has an inner wall 3 on, which on the lateral surface of the sewer segment 1 adjusted so that the fitting piece 2 Approximating on a partial circumference of the sewer line segment 1 is applied. In the case shown ( 2 ) lies the inner wall 3 to 50% of the lateral surface of the sewer segment 1 at.

Due to the chosen shape of the inner wall 3 of the fitting piece 2 this can be on the sewer segment 1 be deferred. The inner wall 3 represents a sickle shape. This shape is also with respect to the outer wall 4 chosen, so that a crescent-shaped or half moon-like cross-section of the fitting piece 2 results. The fitting piece 2 is furthermore eccentric to the sewer segment 1 appropriate.

Perpendicular to the flow direction of the heat transfer medium, the fitting has end elements 5 on which with the inner wall 3 and outer wall 4 Gas- and waterproof are connected. Out 2 will be apparent that the final element 5 a connecting piece 6 has, with the help of which in the fitting 2 located heat transfer medium is connected to a heating circuit.

On the inner surface 7 of the sewer pipe segment 1 is applied a self-cleaning layer, so that black water can be passed through the segment.

1

Sewage pipe segment

2

spud

3

inner wall

4

outer wall

5

termination element

6

spigot

7

inner surface of the sewer pipe segment

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• WO 03/074941 A1 [0012]
• - DE 3244600 A1 [0012]
• - DE 3119855 C2 [0012]
• - DE 4135560 A1 [0012]
• AT 412293 B [0012]
• - DE 3440983 A1 [0012]
• - DE 4435869 A1 [0013]
• - EP 0414769 B1 [0014]
• - DE 4202791 A1 [0015]
• - DE 19846515 C2 [0016]
• - DE 102008017380 A1 [0017, 0019]

Cited non-patent literature

• - DIN 1988 DVGW-TRWI [0010]
• - EN 1717 [0010]
• - EN 806 [0010]

Claims (11)

A heat exchanger assembly comprising a sewage conduit segment ( 1 ) with a fitting ( 2 ) for transmitting the heat energy of a through the sewer segment ( 1 ) flowing wastewater to a in the fitting ( 2 ) located heat transfer medium, wherein the fitting ( 2 ) one to the sewer segment ( 1 ) facing inner wall ( 3 ) and a cross section of the fitting ( 2 ) forming outer wall ( 4 ), characterized in that the shape of the inner wall ( 3 ) of the fitting piece ( 2 ) to the lateral surface of the sewer line segment ( 1 ) is adjusted so that the fitting ( 2 ) approximating a partial circumference of the sewer line segment ( 1 ) and the fitting ( 2 ) on the sewer segment ( 1 ) is attachable. Heat exchanger arrangement according to claim 1, characterized in that the fitting piece ( 2 ) on the sewer segment ( 1 ) releasably non-positively and without tools attachable. Heat exchanger arrangement according to claim 1 or 2, characterized in that the inner wall ( 3 ) of the fitting piece ( 2 ) is substantially sickle-shaped and the fitting ( 2 ) eccentric to the sewer segment ( 1 ) is attached. Heat exchanger arrangement according to claim 1, 2 or 3, characterized in that the fitting piece ( 2 ) perpendicular to the flow direction of the heat transfer medium terminating elements ( 5 ), which with the inside ( 3 ) and outer wall ( 4 ) of the fitting ( 2 ) are connected gas-tight and watertight and at least one connecting piece ( 6 ) exhibit. Heat exchanger arrangement according to claim 4, characterized in that the fitting piece ( 2 ) by means of the connecting piece ( 6 ) is connected to a circuit in which circulates the heat transfer medium. Heat exchanger assembly according to one of the preceding Claims, characterized in that it is in the Heat transfer medium to water and / or propylene glycol is. Heat exchanger arrangement according to one of the preceding claims, characterized in that the sewer segment ( 1 ) on its inner surface ( 7 ) and / or the inside ( 3 ) and / or outer wall ( 4 ) of the fitting ( 2 ) has a self-cleaning coating on the coming into contact with the heat transfer medium surface. Heat exchanger arrangement according to one of the preceding claims, characterized in that in the sewer system upstream of the inlet region of the wastewater medium into the sewer segment ( 1 ) a temperature sensor for determining the temperature of the wastewater medium is attached. Heat exchanger arrangement according to claim 8, characterized in that the sewer segment ( 1 ) is supplied by opening two shut-off devices located at the respective ends of the sewerage segment, and this is shut off when, by comparison of the temperature of the wastewater medium in the sewerage segment ( 1 ) and the temperature before the inlet region of the wastewater medium, a temperature increase or decrease in temperature is detected by inflowing wastewater medium. Heat exchanger assembly according to one of the preceding Claims, characterized in that it is in the Sewage medium is gray or black water. Method for operating a heat exchanger arrangement according to one of claims 1 to 10, characterized that several heat exchanger assemblies in series or in parallel operate.