Patent ID: 11971198
Assignee: RENEWABLE RESOURCE RECOVERY CORP.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  C  E | IPC C  E  F

Claim 4:
5. A bell-end-to-spigot-end sealingly interconnected array of advanced-design, buried, concrete Double EPipe cylinder sections, disposed for gravity transport of human and other fluent wastes and especially purposed for heat transfer between a known heat-pump and connected circulation system for energy-transfer fluid of a first building and liquid and vapor wastes flowing within the sections from either an adjoining neighborhood or a second building, each section being purpose-sized for the defined-flow-rate waste stream being generated from either source, each section configured with at least one wall-integrated-heat-exchange channel coupled into the known circulation system, each section having an overall length in the range 1-5 m, and each section comprising:
a concrete pipe with an inner conduit radius (INTrad_65) about 522 mm;
said pipe-wall thickness range being about 0.09 to 0.16 of the pipe ID;
said concrete (48) being a particular Special-Batch [SB] including Portland-clinker cement and other additives prepared under special compounding conditions sufficient to preserve its homogeneity during molding into the cage held within a form especially adapted to mold features onto the cylinder exterior;
said concrete (48) including at least 10 wt. % CaCO3 added as fine-disperse powder particles smaller than 40 micrometers in diameter;
said concrete (48) including 0 to 1.8 kg/m3 of synthetic polyolefin macrofiber (47);
said hydrated concrete (48) having a compression strength in the range 20<MPa<40;
said pipe provided with 2 concentric reinforcement cage layers encapsulated within said concrete wall and each layer further configured to connect mechanically and thermally with, and thereby explicitly support, at least one HDPE channel (58) of wall thickness at least 1 mm;
said channels being RE-channel-1 of OD (65a18) and HE-channel-2 of OD (65a17), both being integrated within the concrete wall of said section and connected externally to said heat pump (40) for circulation of thermal-exchange fluid (42) between said array-sections and one of said sources (23)
said steel cage elements being one of: bar, wire or mesh having 250<yield strength, MPa<400;
said cage-elements including:, (65-0)
Layer-1 bottom radius, mm
550; 

(65a1)
L-steel 1, helix CL radius, mm
 552.44;

(65a2)
C-steel 1, helix CL radius, mm
 557.32;

(65a3)
HE-channel helix 1, CL radius, mm
 564.82;

(65a4)
radial layer spacing, 65-0 to 65-00, mm
 49;

(65-00)
Layer-2 bottom, radius, mm
599; 

(65a5)
L-steel 2 CL radius, mm
 601.44;

(65a6)
C-steel 2, helix CL radius, mm
 606.32;

(65a7)
HE-channel helix 2, CL radius, mm
 613.38;

(65a8)
L-steel 1 count
17

(65a9)
L-steel 2 count
17

(65a10)
L-steel 1 area, mm2
  32.2

(65a11)
L-steel 2 area, mm2
  32.2

(65a12)
C-steel 1 helix pitch, mm
76

(65a13)
C-steel 2 helix pitch, mm
76

(65a14)
C-steel 1 area, mm2
  32.2

(65a15)
C-steel 2 area, mm2
  32.2

(65a16)
HE-channel helix 1 pitch, mm
76

(65a17)
HE-channel helix 2 pitch, mm
76

(65a18)
HE-channel-1, OD, mm
19

(65a17)
HE-channel-2, OD, mm
19

said C-steel and L-steel cage elements respectively, joined together into a wall-encapsulated, adequately-covered, 3D cage construction sufficient to support the wall zones which may come under tension due to specific external loads and to prevent crack spreading within the concrete wall of said pipe;
said purposed L-steel members being aligned parallel to axis of said section between said pipe ends, positioned radially about said section axis at distances (65a1) and (65a5), spaced apart circumferentially at angles 360/(65a8) and 360/(65a9), together, having a combined sectional area (65a10)*(65a80 and (65a11)*(65a9);
said purposed C-steel members each being configured as a toroid-helix (65a2) and (65a6) centered about the section axis, extending as a wrap between said bell and spigot ends, spaced apart laterally at distances (65a12) and (65a13), each having an area (65a14) and (65a15);
said reinforcement structure includes at two HE-channels (58) each having an outside diam (65a18) and (65a17), wrapped helically among said reinforcing steels, fixed at each turn thereto and extending lengthwise between said bell and spigot ends;
each of said HE-channels configured as a cylindrical helix (65a3) and (65a7) centered about the section axis and spaced laterally along said length at (65a16) and (65a17);
said channels being made of bespoke HDPE tube (60) having a defined min. bend-curvature radius of about 500 mm, a TYS of at least 23 MPa at 23° C. and a wall thickness of at least 1.5 mm;
the available external-heat-transfer-area of each helix-turn of each said channels of selected OD (65a3) and (65a6) embedded into said pipe section of (INTrad_65) is in the range 3.5<area, m2<3.7;
for the case of C-steel and HE-channel wrapped parallel with the same helix pitch over the bundle of L-steels, the thermal connection between these particular elements tied together is surface contact along entire active channel length;
said cages and channel components are further configured spatially to provide 49 mm of radial layer spacing (65a4) using planar sets of 4 radial spacers (45) oriented 90 deg. apart, distributed along the pipe length and fixed between selected L-steel elements;
the planes of said radial spacers being orthogonal to the pipe axis and separated by a distance of about 300 mm;
both ends of each said channel (58) are provided with wall-integral bosses (57) encompassing pipe-external extensions (58c) of terminal portions of said encapsulated channel(s), (58d) and (58e), which are configured during mold preparations to extend outward from the external surface of said final section a distance of at least 150 mm from the adjacent encapsulated tie point (58a);
the axis of each said channel extension (58c) being: [a] in a plane perpendicular to the section axis, [b] tangent to the helix axis of the adjacent encapsulated portion and [c] held at a curvature radius of at least 500 mm while the channel is fluid-pressurized during molding to at least 300 kPa;
whereby when a flow of thermal-exchange fluid is delivered by said heat pump into HE-channels of said sections of the array at a temperature different from that of said liquid and vapor waste streams flowing therein, heat can be exchanged with said adjoining neighborhood or designated building.