CZ12918U1 - Method for measuring heat transferred for heating warm service water - Google Patents

Description

Measurement of heat transferred for hot water production Technical field

The technical solution concerns the connection of heat meters used for the heating of domestic hot water (DHW). This connection basically solves the separate measurement of the heat transferred to the domestic hot water for basic heating from the temperature of the inlet water to the heater (s) to the temperature of the outlet water from the heater and the separate measurement of the heat consumed to reheat the domestic hot water. water from the heater (s).

BACKGROUND OF THE INVENTION

Conventional known solutions measure the heat required to heat domestic hot water by measuring the heat contained in the heat transfer medium used to heat the domestic hot water. Due to the control methods used, this solution is very demanding on the range of meters and in the case of the use of steam as a heat transfer medium, it is often burdened by a large error.

Other known methods use only measurements at the outlet of the heater, in the circulation loop, to measure. These solutions are inaccurate due to the withdrawal of domestic hot water from the circulation loop and the large flow rates in this loop.

Also known is a method of separately measuring the heat required for domestic hot water heating by totally separating the domestic hot water system from the central source. In this case, the domestic hot water from the central circulation is used to heat the circulation in the building. This method of measuring the heat for hot water production does not measure the actual total heat consumed for the heating.

The essence of the technical solution

The technical solution consists in a separate measurement of the heat supplied for domestic hot water heating, in which the first flowmeter (7) of the first calorimeter (6) is mounted at the cold water inlet (2) to the heater (1). Here, the inlet temperature is also measured by the first temperature sensor (8). The outlet temperature is measured at the outlet (3) of the heated water from the heater (1) by a second temperature sensor (9). At the same time, the heat supplied for reheating the domestic hot water, which is returned by the return loop (4) of the circulation loop back to the heater (1), is measured to the outlet temperature measured by the fourth temperature sensor (13) at the outlet (3). The flow meter (11) of the second calorimeter (10) is mounted on the return line (4) of the circulation loop at the circulation inlet of the heater (1), where the inlet temperature is also measured by the third temperature sensor (12). The outlet temperature is measured by a fourth temperature sensor (13) at the outlet (3) of the heated water from the heater (1).

The meters installed in this way measure the heat that was transferred during the basic heating of the inlet water to the outlet temperature of the domestic hot water and the heat transferred to heat the water returning from the circulation to the outlet temperature of the domestic hot water. The total heat transferred is the sum of the heat measured by the above-mentioned meters.

The measurement can also be used for several interconnected domestic hot water heaters including DHW preheating. The flow meters (7, 11) with temperature sensors (8, 9, 12 and 13, respectively) are mounted in the respective common inlet (2), outlet (3) and return line (4) of these heaters. Conventional compact or complex heat meters can be used for the above measurements. Furthermore, a single calorimeter heat meter can be used to calculate heat by measuring the flow and temperature of the water inlet (2) of the heater (1), the water temperature of the outlet (3) of the heater (1) and the flow and return temperature. with return pipe (4) of the circulation loop.

The temperature sensors (9 and 13) may optionally be combined and the temperature measured by one temperature sensor.

-1 CZ 12918 Ul

The final processing of the measured heat, eventually other bases for the evaluation of the total heat, its total and independent evaluation is not technically limited.

BRIEF DESCRIPTION OF THE DRAWINGS

Technical solution - the way of connection is explained in more detail with the help of concrete examples in the schematic diagrams in the attached drawings. For convenience, only one heater is shown in the diagrams. The measurement can also be used in the case of water heating in several interconnected heaters including possible pre-heating. If several heaters are used, the flow meters and temperature sensors used are fitted in the respective common inlet, outlet or circulation piping.

Giant. 1 - Wiring diagram with one calorimeter and one temperature sensor at the outlet of the heater (s).

Giant. 2 - Wiring diagram with two calorimeters and two temperature sensors at the outlet of the heater (s).

Giant. 3 - Wiring diagram with one calorimeter and two outlet temperature sensors from heater 15 (heaters).

Giant. 4 - Wiring diagram with two interconnected calorimeters and one temperature sensor at the outlet of the heater (s).

Legend to pictures:

Heater

Input

Exit

Return loop of the circulation loop

Heat transfer medium for heating

First calorimeter

First flowmeter

First temperature sensor

Second temperature sensor

Second calorimeter

Second flowmeter

Third temperature sensor

Fourth temperature sensor

Interconnection of individual elements of heat meter

Direction of flow.

Example of technical solution

At the inlet (2) to the heater (1) there is located a first inlet water meter (7) and a first inlet water temperature sensor (8) to the heater (1), the outputs of which are simultaneously with the outlet of the second outlet water temperature sensor (9) mounted on the output (3) of the heater (1) connected to the input of the first calorimeter (6). The outlet of the second return flow meter (11) of the circulation mounted on the return loop (4) of the circulation loop and the output of the third return temperature sensor (12) of the circulation mounted on the return loop (4) of the circulation loop connected to the inlet of the second calorimeter (10) which is also connected for data transmission to the first calorimeter (6), see Fig. 4. Further exemplary embodiments are shown in Figures 1, 2 and 3.

Claims (4)

PROTECTION REQUIREMENTS Apparatus for measuring the heat delivered to heat domestic hot water by at least one heater, characterized in that at the inlet ( 2) a first flow meter (7) of inlet water and a first temperature sensor (8) of water entering the heater (1) are provided to the heater (1), furthermore at the outlet (3) 5, a second outlet water temperature sensor (9) is provided from the heater (1) and a second flow meter (11) and a third return water temperature sensor (12) are located on the return loop (4) of the circulation loop, the outputs of the first temperature sensor (8) , a first flow meter (7), a second temperature sensor (9), a third temperature sensor (12) and a second flow meter (11) are connected to the input of the first calorimeter (6). 2. A device for measuring the heat supplied for heating domestic hot water by at least one heater, characterized in that at the inlet (2) to the heater (1) a first flow meter (7) and a first water temperature sensor (8) entering the heater (1) of which the outputs are simultaneously connected to the output of the second outlet water temperature sensor (9) mounted at the outlet (3) of the heater (1) to the inlet of the first calorimeter (6); ) 15, a fourth outlet water temperature sensor (13) is provided, the output of which, together with the output of the second return flow meter (11) mounted on the return loop (4) of the circulation loop and the output of the third return temperature sensor (12) connected into the inlet of the second calorimeter (10). An apparatus for measuring the heat supplied to heat domestic hot water by at least one heater, characterized in that at the inlet (2) to the heater (1) a first flow meter (7) and a first water temperature sensor (8) entering to the heater (1) further comprising at the outlet (3) of the heater (1) a second temperature sensor (9) including a fourth outlet water temperature sensor (13) and a return flow pipe (4) of the second flow meter (11) a return water return sensor with a third return temperature sensor (12) of which The 25 outputs are connected to the input of the first calorimeter (6). A device for measuring the heat supplied to heat domestic hot water by at least one heater, characterized in that at the inlet (2) to the heater (1) a first inlet water meter (7) and a first inlet water temperature sensor (8) are arranged. heaters (1) whose outputs are simultaneously with the output of the second outlet water temperature sensor (9) mounted on the outlet (3) of 30 of the heaters (1) connected to the inlet of the first calorimeter (6) further comprising an outlet from a second return flow meter (11) from the circulation mounted on the return loop (4) of the circulation loop and an outlet from a third return temperature sensor (12) the return loop (4) of the circulation loop is connected to the input of the second calorimeter (10), which is also connected to the first calorimeter (6) for data transmission.