Non-pressurized thermic accumulator with freon coil and wall comprising said thermic accumulator

The non-pressurized thermic accumulator with an immersed exchanger coil and optimized coil spacing enhances heat transfer efficiency by 20-30% and eliminates contamination risks, addressing inefficiencies in existing water heating systems.

EP4703649A1Pending Publication Date: 2026-03-04ZAMFIR NICOLAE- FLORIN
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Patent Information

Application Number
EP2025167097
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-09-03
Filing Date
2025-03-28
Publication Date
2026-03-04

AI Technical Summary

Technical Problem

Existing water heating systems using heat pumps with freon as a heating agent suffer from low efficiency of heat transfer due to limited freon flow and limescale deposits, leading to incomplete heat transfer and increased energy losses.

Method used

A non-pressurized thermic accumulator with a stiffened, thermally insulated casing containing an exchanger coil and a water coil, where the exchanger coil is immersed in the primary thermic agent, allowing direct thermal contact and optimized spacing for enhanced heat transfer, and a water coil for circulating water, positioned in a single vertical plane for efficient heat exchange.

Benefits of technology

The solution increases heat transfer efficiency by 20-30% compared to prior art, allowing for larger volumes of primary thermic agent to be heated or cooled, and eliminates the risk of contamination by immersing coils directly into the primary agent, while reducing the need for separate technical rooms and saving space.

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Abstract

The invention relates to a thermic accumulator (AT) configured to be mounted inside or instead of a building wall, comprising a closed, stiffened, thermally insulated parallelepipedal casing, configured to be filled with a permanently non-pressurized primary thermic agent. An exchanger coil (CHC, CHV) and a water coil (CW1, CW2) are immersed in the primary thermic agent. The casing in the working position is configured to allow its filling with the unheated primary thermic agent, up to a preset filling level, and to allow the expansion of the heated primary thermic agent up to a preset expansion level located between the preset filling level and an overflow port, said overflow port being arranged in the casing wall in the control area between the preset expansion level and the upper face of the casing. The casing contains a safety air volume between the preset filling level and the upper face of the casing. The casing allows the safety air volume to be discharged from the casing through the overflow port in order to maintain the primary thermic agent in a non-pressurized form. The exchanger coil (CHC, CHV), through which freon circulates, is connected at the inlet end of the exchanger coil and at the outlet end of the exchanger coil to a first heat pump (PC1). The water coil (CW1, CW2), through which a circulating water circulates, is connected at the inlet end of the water coil to a circulating water source (ARS, VEN) and at the outlet end of the water coil to a circulating water consumer (CC ACM 1, VEN). The exchanger coil (CHC, CHV) is configured to perform a first heat transfer between the freon flow in the exchanger coil and the primary thermic agent in the thermic accumulator (AT), and the water coil (CW1, CW2) is configured to perform a second heat transfer between the primary thermic agent in the thermic accumulator (AT) and the circulating water in the water coil (CW1, CW2).
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