Hot water supply tank, hot water supply tank unit, and heat-pump water heater

EP4592613A4Pending Publication Date: 2026-06-24CARRIER JAPAN CORP
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Patent Information

Application Number
EP2022959570
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2022-09-22
Publication Date
2026-06-24

AI Technical Summary

Technical Problem

Hot water supply tanks in heat pump water heaters experience uneven temperature distribution due to natural convection, leading to reduced heat retention in the lower portion, and the existing insulation structure interferes with manufacturability, installation, and maintainability.

Method used

The hot water supply tank design includes a water supply pipe outlet below the coil, with insulation material covering the tank surface above the outlet and coil ends, featuring varying insulation performance and thickness to match temperature distribution, and a temperature sensor for optimal control.

Benefits of technology

This design effectively suppresses heat dissipation, maintains temperature uniformity, reduces material costs, and enhances manufacturability, installation ease, and maintenance accessibility.

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Abstract

Provided is a hot water generation apparatus that can perform an efficient operation or an operation that maintains user comfort, in accordance with conditions, without using a plurality of pumps. A hot water supply tank (12) includes: a tank (51) storing supply water; a water supply pipe (53) having an outlet (52) disposed in a bottom portion inside the tank (51) and pouring the supply water into the tank (51); a coil (55) provided inside the tank (51) and circulating water for heating the supply water in the tank (51); a hot water supply pipe (56) guiding hot water which is the supply water heated in the tank (51) to an outside of the tank (51); and a heat insulation material (58) covering an outer surface of the tank (51) above a vicinity of a height of the outlet (52) of the water supply pipe (53) or a vicinity of a height of a lower end (55d) of the coil (55).
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Citation Information

Patent Citations

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    CN201652803U

  • Hot water supply system

    EP2495500B1

  • Chauffe-eau electrique a forte isolation thermique

    FR2803652A1

  • Improvements in or relating to water heaters

    GB477298A

  • Hot water storing tank unit of hot water storage type hot water supply machine

    JP2008215632A