DE19528340A1 - Heater system as boiler and pipe circuit - Google Patents

Abstract

When the water tap is turned, the three-way valve (1) in the outlet sense switches over to circulating mode and the circulating system (4) (pump) remains switched on until the temperature sensor (2) at the valve registers a feed water temperature above a preset threshold whereupon the valve is switched back to outlet direction and the pump shut down. Valves are fitted into each pipe strand (6) to link feed, return and withdrawal settings so as to pass water from feed to tap point and cut out the return during this. In active settings, however, the feed and return remain connected as against the tap points which are almost cut off from the circuit. A pressure gauge (3) fitted to the valve in the feed system is used to detect falls in pressure when the water is tapped so as to notify this to the controls and detect water flow to the taps and inform the controls accordingly. The temperature sensor of the valve forms a bi-metal element used to report excessive temperature to the controls or again consists of a thermoelectric sensing element.

Description

The domestic water supply with warm water takes place in residential buildings via a piping system with different tapping points ( 7 ). In the vicinity of the tapping points (e.g. central for a bathroom or the kitchen), a return is connected to the inlet via a T-piece. All return lines combine to form a common return, which feeds the process water back into the boiler. The circulation in this system is carried out by a circulation pump. The switch-on times and durations are determined empirically. While this principle makes sense in multi-family houses, since statistically tap water is drawn at any time, in single-family houses energy would be wasted due to the permanent circulation of the hot water. Heated but not used water is cooled by unnecessary circulation and leads to more frequent heating phases in the boiler. On the other hand, when the pump is at a standstill, the water column cools down relatively quickly in the flow. If hot water is required during these times, the amount of water must flow from the boiler to the point of use unused.

The invention is therefore based on the object To create a device that allows hot water to provide as needed, without this through long circulation cools down and thus becomes more frequent Heating cycles in the boiler. Will be on a circulation pump completely dispensed, flow when requested by hot domestic water, an average of 10 liters of cold water Water unused.

This object is achieved by the in claims 1 to 7 marked measures solved, whereby in System described in claim 1 both New installation as well as retrospectively in an existing one Hot water supply system can be installed.

Claims (8)

l. Arrangement for reducing the water and energy consumption in a hot water supply system without significant comfort restriction, which feeds the hot water cooled in the pipes back into the boiler instead of letting it run out, characterized in that when the tap is opened, the three-way valve ( 1 ), which in The outlet direction is set to circulation and the circulation system ( 4 ) is switched on until the temperature sensor ( 2 ) on the three-way valve ( 1 ) registers a temperature above a certain threshold in advance and then switches the three-way valve ( 1 ) in the outlet direction and the circulation system ( 4 ) turns off. 2. Arrangement according to claim 1, characterized in that in the hot water supply system in each line ( 6 ) a three-way valve ( 1 ) is attached, the forward, return and the tapping points ( 7 ) connects to each other, such that it is the passage of at rest Water is made possible from the flow to the tapping points, blocking the return flow, connecting the flow and return flow in the active position and almost decoupling the tapping points ( 7 ) from the water cycle. 3. Arrangement according to claim 1, characterized in that a pressure gauge ( 3 ) is attached to the three-way valve ( 1 ) in advance, such that a pressure drop is detected when water is drawn and the control is communicated. 4. Arrangement according to claim 1, characterized in that a water flow meter ( 3 ) is mounted in the flow on the three-way valve ( 1 ), such that a water flow is detected in the direction of tapping points and the control is communicated. 5. Arrangement according to claim 1, characterized in that a temperature sensor ( 2 ) is installed in the flow on the three-way valve ( 1 ), such that it is detected when a certain temperature threshold is exceeded, and this is transmitted to the controller. The temperature sensor ( 2 ) is implemented as a bimetal element. 6. Arrangement according to claim 5, characterized in that the temperature sensor ( 2 ) is realized as a thermoelectric sensor. 7. Arrangement according to claim 1, characterized in that a control unit ( 7 ) receives the information about temperature and water flow, and thus controls the valves ( 1 ) and the circulating device ( 4 ). The control unit is based on a microcontroller. 8. Arrangement according to claim 7, characterized in that the control unit is implemented mechanically.