DE19640934A1 - Procedure for economical by-pass of energy, material and water in hot and cold water systems - Google Patents

Abstract

The procedure has the stale cooled water in the hot water pipe (7) made ready by a 3-way valve for a cold water consumer (3) at the exit of the valve and the temperature of the hot water is increased in the hot water pipe to a set point temperature. The cold water consumer and a cold water pipe (8) are joined at the valve exit. Depending on the actual temperature of the water in the warm hot pipe at a temperature sensor (6) and the set point temperature of the valve, this valve is switched over by a thermo-mechanical or electrical-electronic control unit.

Description

The invention relates to a method according to the preamble of claim 1.

It serves to avoid waiting times and wasted water in warm and Chilled water systems when the water in the hot water pipe cools down when not in use is and it enables convenient hot water provision with simple means.

The following technical solutions are available for hot water pipes in hot and cold water systems currently in use.

• a) without circulation line
• b) without circulation line with additional preheating device
• c) with circulation line by gravity drive
• d) with circulation line and circulation pump
• e) with circulation line and circulation pump with timer
• f) with circulation line and circulation pump with pulse switch
• g) with circulation line and circulation pump with electronic switching systems.

All of the current technical solutions listed have disadvantages in addition technical effort and additional operating costs due to high energy input let arise.

Additional technical expenses:

• - Additional heating device
• - circulation line
• - circulation pump
• - timer
• - pulse switching device
• - Electronic devices with special valve fittings

Additional operating costs:

• - Power consumption at points b), c), d), e), f), g)
• - increased water consumption (water waste) at point a)
• - less increased water consumption in points b), f), g)
• - increased thermal energy consumption in points b), c), d)
• - less increased heat energy consumption at point d).

The object of the invention is, with simple means and little effort, a device for to realize comfortable hot water provision, with which no waiting times at the Hot water tap and the water consumption, energy and material costs arise are minimized.  

This object is achieved by a method with the features of claim 1.

Economical, convenient hot water provision in hot and cold water systems by installing a cold water consumer on a 3-way switch valve, which is connected to the Hot and cold water pipes are connected, realized.

The invention has the following advantages:

• - Chilled water in the hot water pipe is used
• - The hot water temperature in the hot water pipe is maintained
• - No waiting times and wasted water at hot water taps
• - Reduction of energy costs (heat and electricity)
• - Assembly and material costs low
• - Easy installation with various connection options
• - Subsequent installation with various connection options in existing hot and Chilled water systems possible without much effort.

Principle, function and exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

Fig. 1 schematic representation of 3- way switch valve;

Fig. 2 state 1 , water temperature in the hot water pipe less than the target temperature;

Fig. 3 state 2 , water temperature in the hot water pipe greater than or equal to the target temperature;

Fig. 4 Schematic diagram of hot and cold water system with 3-way switch valve.

The 3-way changeover valve with the control 4 (internal or external) must be such that a changeover of the direction from 1 to 3 and from 2 to 3 by temperature comparison of the actual temperature at the temperature sensor 6 (internal or external) and the Target temperature adjuster 5 is reached.

The 3-way switch valve connection 1 is the hot water supply.

The 3-way switch valve connection 2 is the cold water inlet.

The 3-way switch valve connection 3 is the water drain.

The 3-way switch valve must be smaller than the target temperature in the direction of 1 at the actual temperature Switch to 3 and if the actual temperature is greater than or equal to the target temperature in the direction of 2 switch to 3.

The comparison of the actual and target temperature and the changeover process can be done by thermo mechanical or electrical-electronic controls.

The function of the 3-way switch valve is shown in FIGS. 2 and 3. It is assumed that a cold water consumer is connected to outlet 3 of the 3-way switch valve.

If the temperature of the water from the hot water line 7 is lower than the set target temperature, the cooled hot water flows through the 3-way switch valve in the direction from 1 to 3 to the cold water consumer.

If the temperature of the water in the hot water pipe rises to the set target temperature, the 3-way switch valve switches in the direction from 2 to 3 and the cold water consumer is supplied from the cold water pipe 8 .

The 3-way switch valve should be installed at the end of a hot water pipe if possible, to achieve the greatest possible effect of the invention. The toilet flush would be advantageous, To use the washing machine and dishwasher as the main cold water consumer after the valve, so that a permanent function of the invention is guaranteed.

Claims (6)

1. Process for the economical use of energy, material and water in hot and cold water systems, characterized in that the cooled (stale) water in the hot water pipe ( 7 ) for a cold water consumer at the outlet ( 3 ) of the by a 3-way switch valve 3-way switch valve provided and the temperature of the hot water in the hot water pipe ( 7 ) is increased to the target temperature. 2. The method according to claim 1, characterized in that a cold water consumer at the outlet ( 3 ) of the 3-way switching valve to a hot water line ( 7 ) and a cold water line ( 8 ) is connected. 3. The method according to claim 1, characterized in that depending on the actual temperature of the water in the hot water pipe at the temperature sensor ( 6 ) and the target temperature setting ( 5 ) of the 3-way switch valve this by a thermo-mechanical or electrical -electronic control 4 is switched. 4. The method according to claim 1, characterized in that the control ( 4 ) of the 3-way switch valve only so much water from the hot water pipe 7 to the cold water consumer at the drain ( 3 ) of the 3-way switch valve can flow until the incoming water has reached the target temperature in the hot water pipe ( 7 ). 5. The method according to claim 1, characterized in that the control ( 4 ) of the 3-way switch valve after reaching the target temperature, the cold water consumer at the drain ( 3 ) of the 3-way switch valve from the hot water line 7 to the cold water line ( 8 ) switches. 6. The method according to claim 1, characterized in that hot water in the hot water pipe ( 7 ) is quickly (without waiting) at hot water taps ready for removal.