Abstract

Hot water circulation system (200) for a building, said system comprising a hot tap water circulation circuit (210); a circulation pump (211); water taps (220-224); a cold water inlet (240) to said circulation circuit; a heat exchanger (230), arranged to heat the water using an externally provided heat medium; a first conduit (213), leading a first share of water from said pump to said taps via said heat exchanger; a temperature sensor (251), arranged downstream of said heat exchanger; and a control device (250), arranged to control a flow of said heat medium. The invention is characterised in that the circulation circuit comprises a second conduit (214), leading a second share of water from said pump to said taps in parallel to said first conduit, in that the first share is at least smaller than said second share as long as no cold water is provided to the circulation circuit, and in that the circulation system further comprises a heat pump (260), heating the water. The invention also relates to a method.

IPC Classes  ?

• F24D 17/00 - Domestic hot-water supply systems
• F24D 3/08 - Hot-water central heating systems in combination with systems for domestic hot-water supply
• F24D 3/18 - Hot-water central heating systems using heat pumps
• F24D 17/02 - Domestic hot-water supply systems using heat pumps
• F24D 19/10 - Arrangement or mounting of control or safety devices
• E03B 7/04 - Domestic or like local pipe systems

Abstract

Method for increasing the efficiency during heating or cooling using an at least partly liquid filled energy well (1). A cooling agent is caused to stream in a conduit (3) arranged in the well (1) and by heat exchange to extract heat or coldness from the material surrounding the well (1). The well (1) is caused to be divided in at least two partly separated chambers using a barrier (201) caused to extend inside the well (1) and along the main direction of elongation of the well (1). The invention is characterised in that the conduit (3) is caused to run in a first one of the chambers in a direction down and in a second one of the chambers in direction up, so that the temperature difference between the cooling agent in the first chamber and the cooling agent in the second chamber gives rise to natural circulation in the well. The invention also relates to a device.

IPC Classes  ?

• F24J 3/08 - using geothermal heat (devices for producing mechanical power from geothermal energy F03G 4/00)

Abstract

Method for increasing efficiency during heating or cooling using an energy well (1) in the form of an elongated hole the bottom of which is arranged at a greater depth than its opening, where a cooling agent streams through the well (1) in a collector conduit (3) and is heat exchanged against the material surrounding the well (1). The invention is characterised in that a tube (301) runs down into the energy well (1) from above its opening and down along the energy well (1) towards its bottom, in that the end (303) of the tube (301) facing towards the bottom of the energy well (1) is open, in that liquid is supplied through the tube (301) so that the liquid thereby streams down and out into the energy well (1) through the open end (303) of the tube (301), in that gas bubbles (305) are supplied to the liquid streaming down through the tube (301), and in that the added gas bubbles (305) are so small so that they rise more slowly in the liquid than the velocity of the liquid at the supply point.

IPC Classes  ?

• F24J 3/08 - using geothermal heat (devices for producing mechanical power from geothermal energy F03G 4/00)
• F04F 1/20 - Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium being mixed with, or generated from, the liquid to be pumped specially adapted for raising liquids from great depths, e.g. in wells