DE102019008520A1 - Component for stabilizing the pressure maintenance of building heating systems on district heating networks - Google Patents

Abstract

The stabilization of the pressure maintenance of a building heating system on district heating networks is implemented according to the state of the art by feeding primary water into the secondary circuit and secondary circuit water replenished. Water make-up is only to be used with secured quantity limits that cannot be changed by the customer. For water make-up, a component is being developed which is arranged on the heat exchanger of the district heating house connection station in such a way that an adjustable, limited amount of make-up water can be fed from the primary return to the secondary return. The newly developed component consists of a valve body of a volume flow regulator on which 2 powerless drives drive 1 and drive 2 are arranged To determine the make-up time, a diaphragm expansion tank combined with valves as shown in the legend and drawing is used. The component consists of a valve combination of a modified overflow regulator without auxiliary power with adjustable setpoint that is combined with a downstream pressure regulator with an adjustable setpoint that is combined via an adapter (drawing). The downstream pressure regulator opens when the pressure in the house system falls, the overflow regulator closes when no more water flows out of the MAG towards the house system. If the operating pressure on the primary side is greater than that of the house system, another overflow regulator with a corresponding nominal pressure level must be provided between the house connection station and the make-up assembly (drawing).

Description

State of the art

The stabilization of the pressure maintenance of a building heating system is realized in accordance with the state of the art by feeding primary water into the secondary circuit via auxiliary energy-controlled or differential pressure-controlled make-up to cover leakage losses in the building heating network.

In the case of differential pressure-controlled make-up, water is topped up via a valve combination consisting of a back pressure regulator, overflow regulator and another back pressure regulator using the pressure difference between the primary circuit and the secondary circuit.

• - Bei höherer Nenndruckstufe primärseitig gegenüber der Hausanlage kann keine Nachspeisung eingesetzt werden.
• - durch den erforderlichen Einsatz von mehreren Ventilen ergibt sich eine große Baulänge und rel. große Kosten.
• - die Begrenzung der Nachspeisemenge erfolgt über ein Drosselkegelventil, das für unbefugte Verstellung gesichert ist
• - durch die große Baulänge der Nachspeisung ist ein Einbau in die Hausanschlussstation nicht möglich.
• - der Einsatz eines Nachdruckreglers zur Erzielung einer gleichmäßigen Nachspeisemenge ist bei mindestens gleicher Nenndruckstufe primär und sekundäre nicht erforderlich.

Disadvantages of this differential pressure-controlled make-up are:

• - With a higher nominal pressure level on the primary side compared to the house system, no water make-up can be used.
• - The required use of several valves results in a large overall length and rel. great cost.
• - The make-up quantity is limited by means of a throttle cone valve which is secured against unauthorized adjustment
• - Due to the length of the make-up, it cannot be installed in the house connection station.
• - The use of a back pressure regulator to achieve a uniform make-up volume is not necessary with at least the same nominal pressure level primary and secondary.

The supply companies make the use of water make-up dependent on the time-limited make-up quantity. Make-up without guaranteed quantity limits will only be permitted in exceptional cases. The use of auxiliary energy-controlled make-up has the disadvantage that if the power supply fails, the pressure maintenance cannot be stabilized, even though a make-up would be necessary in this operating state.

task to be solved

The aim of the patent is to remedy the deficiencies of the state of the art and to find a technical solution that enables a quantity-limited make-up in the house heating circuit, which cannot be influenced by the customer, under all conditions, even at a higher nominal pressure level on the primary side. Furthermore, a newly developed special combination valve is used for the make-up circuit, which greatly reduces the overall length and saves costs.

Design of the patent and achievable technical results

Based on the aim of the invention, a make-up component is developed which is arranged on the heat exchanger of the house connection station in such a way that an adjustable, limited amount of make-up water can be fed from the primary return to the secondary return.

The newly developed component consists of a valve body of a volume flow controller on which 2 powerless drives, drive 1 and drive 2, are arranged

To determine the make-up time, a MAG membrane expansion tank is combined with

Valves according to legend and (drawing 2). This arrangement can only be made if the nominal pressure levels primary and secondary are at most the same.

If the nominal pressure level is primarily higher than that of the house system, a back pressure regulator combined with a safety shut-off valve must be connected upstream of the make-up component so that the permissible pressures are not exceeded in the secondary part (drawing 1)

applicability

The patent can be used as a component to stabilize the pressure maintenance of building heating systems in new buildings and as a retrofit.

Figure list

• Drive 1 D500 / 501 xs = 1-5 bar
• Drive 2 D52 xs = 1-5 bar
• Drive 3 downstream pressure regulator combined with safety shut-off valve Valve body volume flow regulator

List of reference symbols

①

Cone check valve DN15

②

Cone check valve DN15

③

Fine control valve

④

Pressure transmitter

⑤

Connection pressure gauge

⑥

Connection piece (M42x1.5) for drive 2

Claims (1)

Component for stabilizing the pressure maintenance of the house heating systems in buildings with a district heating connection by compensating for water losses in the house heating network from the primary return of the house connection station, characterized in that a component valve combination consisting of a valve body V1 of a volume flow / differential pressure regulator with a pressure-relieved cone on the 2 diaphragm actuators (A1, A2 ) are mounted without auxiliary energy with an adjustable setpoint. The time to compensate for the water loss is determined by the outflow speed of the additional water from the valve combination and the size of the additional tank (B). If a pressure reducer with safety shut-off valve (7) is also used, it can be used with a lower nominal pressure level of the house system compared to the return to WÜ.

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