US 12,222,167 B2
Arrangement and a method for storing thermal energy in the ground
Jakob Isaksson, Ytterby (SE); and Karl Johan Hogmalm, Gothenburg (SE)
Appl. No. 18/289,149
Filed by Jakob Isaksson, Ytterby (SE); and Karl Johan Hogmalm, Gothenburg (SE)
PCT Filed May 5, 2022, PCT No. PCT/SE2022/050440
§ 371(c)(1), (2) Date Nov. 1, 2023,
PCT Pub. No. WO2022/240336, PCT Pub. Date Nov. 17, 2022.
Claims priority of application No. 2150613-4 (SE), filed on May 12, 2021.
Prior Publication US 2024/0369309 A1, Nov. 7, 2024
Int. Cl. F28D 20/00 (2006.01)
CPC F28D 20/0052 (2013.01) 15 Claims
OG exemplary drawing
 
1. An arrangement for storing thermal energy, the arrangement comprising
a circuit containing a working fluid, the circuit having a plurality of pipes which pipes are distributed throughout a volume of the ground forming a heat storage, each pipe being arranged in a channel in the ground for heat exchange between the working fluid and the ground, and
an electrical heating element, the electrical heating element being arranged in a channel in the ground to heat the ground for storing thermal energy in the heat storage, wherein the working fluid is a liquid having a boiling point above 120° C. at atmospheric pressure.