US 12,215,929 B2
Device for recovering waste heat from hot water
Young il Song, Asan-si (KR)
Assigned to IDO CO., LTD, Asan-si (KR)
Appl. No. 18/016,735
Filed by IDO CO., LTD, Asan-si (KR)
PCT Filed Jul. 5, 2021, PCT No. PCT/KR2021/008518
§ 371(c)(1), (2) Date Jan. 18, 2023,
PCT Pub. No. WO2022/019524, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 10-2020-0092133 (KR), filed on Jul. 24, 2020.
Prior Publication US 2023/0280105 A1, Sep. 7, 2023
Int. Cl. F24H 3/00 (2022.01); F28D 7/10 (2006.01); F28D 21/00 (2006.01)
CPC F28D 21/0012 (2013.01) [F28D 7/10 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A device for recovering waste heat from hot water, the device comprising:
N heat exchange units (wherein N is greater than or equal to 1) connected in series to each other by means of a coupling member, each heat exchange unit having a waste water pipe part along which waste water as the hot water flows and a raw water pipe part along which raw water as cold water flows, while being located inside the waste water pipe part; and
a rotation driving part for rotating the raw water pipe parts,
wherein each raw water pipe part comprises a rotary shaft, a spiral blade attached to the outer peripheral surface of the rotary shaft, and a raw water pipe spirally wound on the outer peripheral surface of the rotary shaft to flow the raw water therealong, while being disposed along the space formed by the spiral blade on the outer peripheral surface of the rotary shaft.