# US 2019/0376751 A1 · Pipe heat exchanger for a baking oven

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- Number: US 2019/0376751 A1
- Document ID: US20190376751A1
- Status: Published application
- Kind: A1
- Application number: 16/432,204
- Filed: 2019-06-05
- Published: 2019-12-12
- Earliest claimed: 2018-06-06
- Assignees: Werner & Pfleiderer Industrielle Backtechnik GmbH
- Applicants: Werner & Pfleiderer Industrielle Backtechnik GmbH
- Inventors: Ulrich Speck
- Web page: https://patentgrep.com/patent/US20190376751A1

## CPC

- F28D 7/087: {assembled in arrays, each array being arranged in the same plane}
- F28F 9/0243: {Header boxes having a circular cross-section}
- F28D 1/0477: {the conduits being bent in a serpentine or zig-zag}
- F28D 3/02: with tubular conduits
- F28F 9/002: {with fastening means for other structures}
- F28F 9/0224: {Header boxes formed by sealing end plates into covers (F28F9/0221 takes precedence)}
- F28F 9/0246: {Arrangements for connecting header boxes with flow lines}
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)

## Abstract

A pipe heat exchanger for a baking oven has a plurality of heat exchanger pipe sections configured to guide a heat carrier fluid, the heat exchanger pipe sections being arranged adjacent to each other in an arrangement plane. A distance between adjacent pipe sections is smaller than a pipe diameter and greater than 1% of the pipe diameter. The result is a pipe heat exchanger, which allows a baking space to be heated efficiently and variably.

## Claims

### Claim 1

A pipe heat exchanger for a baking oven,
with a plurality of heat exchanger pipe sections configured to guide a heat carrier fluid, the heat exchanger pipe sections being arranged adjacent to each other in an arrangement plane,
wherein a distance of adjacent pipe sections is smaller than a pipe diameter and greater than 1% of the pipe diameter,
wherein the pipe heat exchanger is configured as a pipe coil heat exchanger, which has:
a first coil line path, formed between a first coil line inlet and a first coil line outlet, and
a second coil line path, formed between a second coil line inlet and a second coil line outlet,
wherein 180° deflection sections between two pipe sections of the same coil line path are guided out of the arrangement plane for at least one of the coil line paths.

### Claim 2 (depends on 1)

The pipe heat exchanger as claimed in claim 1, wherein a passage between the pipe sections, with the exception of interruptions due to mounting components, extends along all of the pipe sections.

### Claim 3 (depends on 1)

The pipe heat exchanger as claimed in claim 1, wherein it has more than two coil line paths.

### Claim 4 (depends on 1)

The pipe heat exchanger as claimed in claim 1, wherein in each case two pipe sections arranged adjacent to one another in the arrangement plane belong to different coil line paths.

### Claim 5 (depends on 1)

The pipe heat exchanger as claimed in claim 1, wherein the two coil line inlets are in a fluidic connection, via a Y-pipe section, with a collective line inlet.

### Claim 6 (depends on 3)

The pipe heat exchanger as claimed in claim 3, wherein the two coil line outlets are in a fluidic connection, via a Y-pipe section, with a collective line outlet.

### Claim 7 (depends on 1)

A method of producing a pipe coil heat exchanger as claimed in claim 1, comprising the following steps:
providing a pipe, which has a multiple of the length of one of the pipe sections,
producing a first coil line path by bending the pipe in the region of deflection sections between the pipe sections,
producing a second coil line path by bending the pipe in the region of deflection sections between the pipe sections,
inserting the two coil line paths into one another in the arrangement plane.

### Claim 8 (depends on 7)

The method as claimed in claim 7, wherein prior to inserting, 180° deflection sections are bent out of the arrangement plane between two pipe sections of the same coil line path for at least one of the coil line paths.

### Claim 9 (depends on 8)

The method as claimed in claim 8, wherein the 180° deflection sections of the coil line path, which are arranged at an end of the pipe coil heat exchanger, are bent out of the arrangement plane simultaneously.

### Claim 10 (depends on 1)

A baking oven module with at least one pipe heat exchanger as claimed in claim 1, and with a baking space, which is heated by the pipe heat exchanger.

### Claim 11 (depends on 1)

A baking oven with at least one pipe heat exchanger as claimed in claim 1, and with a baking space, which is heated by the pipe heat exchanger.