CZ299501B6 - Device for differential measurement of warm service water - Google Patents

Abstract

Warm water is supplied through a supply pipe via a supply sensor (11) of amount of water delivered to the object. Unused water flows back and returns through a recirculation piping to a source via a circulation sensor (12). An evaluation unit (15), forming part of the system, evaluates received pulses from the sensors (11 and 12), and transmits them to calorimetric units (13, 14). After arrival of a pulse of the circulation sensor (12) to the input ,BÆÆ of the evaluation unit (15) a flag is set for cancellation of a pulse on the input ,,A'' coming from the supply sensor (11). After arrival of the pulse ,,A'' the evaluation unit (15) verifies the flag setting and if the flag is set, the pulse ,,A'' is cancelled. Otherwise, addition and transfer to the calorimetric unit (13) take place. All pulses ,,B'' of the circulation sensor (12) are communicated via the evaluation unit (15) to the calorimetric unit (14). The supply sensor (11) of amount of water delivered to the object is mounted on the supply pipe, which sensor exhibit within the region of through flow Qt a longer period of pulses if compared with the circulation sensor (12).

Description

Technical field

The invention relates to a device for differential measurement of domestic hot water.

BACKGROUND OF THE INVENTION

In the case of conventional domestic hot water distribution, the distribution loop is fed from a central source and the domestic hot water is routed through the external and internal supply piping to the individual sampling points and subsequently not collected, ie circulating water through the internal and subsequently external piping back to the central source. . When measuring the amount of domestic hot water taken, each tap may be provided with a separate meter, for example a domestic water meter. However, there is a significant difference in the measurement of the domestic hot water consumption compared to the sum of domestic water meters.

However, the installation of residential water meters is very disadvantageous and often technically impossible for buildings with many water abstraction for one customer such as kindergartens and elementary schools, medical facilities, hotels, business buildings etc. and therefore it is very convenient to measure the consumption of hot service water at the input. into the object.

Currently, there are two ways of measuring the consumption of domestic hot water at the entrance to the building.

One of them today is almost unused differential measurement with one water meter on the supply pipe and the other with the circulation pipe. The difference of these water meters is to show the consumption of hot water in the building. This method is almost unusable due to the significant overall error in the annual balance, since even a small error integrated over time gives a significant error in its result, especially in terms of volume, small offtakes in the object.

The second method is based on the fact that in the inner loop of the TU V there is a heat exchanger for heating the water of the inner circuit passing through the exchanger, the inner circuit being connected to the inner loop by a connecting line provided with a water meter. resulting from an inner loop in front of the heat exchanger. A circulation pump is integrated into the internal circuit. A heat meter is sometimes included in the return loop of the inner loop. The disadvantages of this cause several. The water meter starts from the idle position during sampling and returns to it when the sampling is closed, causing an undefined measurement error. For this reason, it is not possible to measure the heat consumed in the domestic hot water taken, as the correct function of the heat meter requires the measurement of the medium flow in the area of definable errors, that is, in the area above Qmin. The electrical energy consumed by the pump operation increases the operating costs of the system. The exchanger itself gets clogged on the domestic hot water side, which causes insufficient heating of the water in the circulation loop of the internal piping.

SUMMARY OF THE INVENTION

Apparatus for performing differential measurement of domestic hot water, consisting of a pipeline provided with a shut-off valve at the inlet and outlet, a piping loop or an outlet at the control valve, is arranged so that the supply piping is equipped with a hot water sensor The pulse outputs of the sensors are led to an evaluation unit consisting of a microprocessor 31, a block of forming and auxiliary circuits 32, a block of output circuits 33, and a display.

Said device may be supplemented by other components such that the supply line is fitted with a temperature sensor, the output of which is led to a calorimetric unit, connected by an output to an evaluation unit, into which also an output from a temperature sensor, which is fitted with a cold water pipeline.

Said apparatus may further be supplemented such that the supply line is further provided with a temperature sensor whose output is led to a calorimetric unit and the circulation line is equipped with a temperature sensor whose outlet is also led to a calorimetric unit, the calorimetric unit being connected to an evaluation output. unit.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated in more detail in the drawings, in which Figure 1 shows a diagram of a device for measuring the amount of hot water used. Figure 2 shows a diagram of a device for measuring the required amount of domestic hot water and the amount of heat contained therein. Figure 3 shows a diagram of a device for measuring the required amount of hot service water and the amount of heat contained therein, as well as the heat loss of the hot service water distribution system in the building. Figure 4 shows a diagram of the evaluation unit.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

Apparatus for performing differential measurement of domestic hot water, consisting of a supply line P provided with a shut-off valve 1 at the inlet and a filter 6 and a circulation pipe Z provided with a shut-off valve 5, up to a pipe loop with sampling points 10 and shut-off valves 2, 4 the piping P is provided with a sensor H of the domestic hot water quantity and a piping Z with a sensor 12 of the amount of waste water used, the pulse outputs 21, 22 of the sensors 11, 12 being led to an evaluation unit 15 consisting of a microprocessor 31, The feed line P can be connected to the circulation pipe Z by a jumper equipped with a shut-off fitting 3.

Example 2

Apparatus for performing a differential measurement of domestic hot water as described in Example 1, further adapted so that the pipe P is fitted with a temperature sensor 16, the outlet 23 of which is led to a calorimetric unit 13 connected by the outlet 24 to the evaluation unit 15 into which the outlet 25 flows sensor 17, which is fitted with cold water pipe S.

Example 3

Apparatus for performing the differential measurement of domestic hot water as described in Example 1 and Example 2, further supplemented with components such that line P is further equipped with a temperature sensor 18 whose outlet 26 is led to a calorimetric unit 14 and line Z is equipped with a temperature sensor 19 27 is also led to the calorimetric unit 14, wherein the calorimetric unit Γ4 is connected via the output 28 to the evaluation unit 15.

Industrial applicability of the invention

The device according to the invention can be used to measure the consumption of hot service water at the entrances to the heated buildings, at the outputs of the heat source, such as boiler rooms and heat exchanger stations, and at the circuits of the central domestic hot water distribution. They can also be used to acquire and process additional data for measurement and remote control of heat distribution operations.

Claims (3)

PATENT CLAIMS Apparatus for performing a differential measurement of domestic hot water, consisting of a pipeline provided with a shut-off valve at the inlet and outlet, a pipe loop, or a control valve at the outlet, characterized in that the pipe (P) is provided with a domestic hot water quantity sensor (11) and piping (Z) through a sensor (12) of the amount of water used, the pulse outputs (21, 22) of the sensors (11, 12) being led to an evaluation unit (15) consisting of a microprocessor (31), a block of forming and auxiliary circuits ( 32), output circuit block (33) and display (34). Apparatus for performing differential measurement of domestic hot water according to claim 1, characterized in that the pipe (P) is fitted with a temperature sensor (16), the outlet (23) of which is led to a calorimetric unit (13) connected by the outlet (24) to an evaluation unit (15) into which the outlet (25) of the temperature sensor (17), through which the cold water pipe (S) is fitted, opens. Apparatus for performing a differential measurement of domestic hot water according to claims 1 and 2, characterized in that the pipe (P) is further equipped with a temperature sensor (18), the outlet (26) of which is led to the calorimetric unit (14) and the pipe ( Z) is provided with a temperature sensor (19) whose output (27) is also led to a calorimetric unit (14), the calorimetric unit (14) being connected by an output (28) to the evaluation unit (15).