CZ285774B6 - Ratio indicator fed with electric power - Google Patents

Abstract

The invention concerns an electrically powered ratio indicator for setting allowances for the heating of rooms by a heating unit. The ratio indicator consists of a compact body (2), which consists of an inner section (1) to which the first heat sensor (3), for detecting temperatures at 45 to 55 % of the headroom of the heating unit, and the second heat sensor (4), for detecting temperatures at 55 to 100 % of the headroom of the heating unit, are connected. It also consists of an external casing (2) on whose thermally insulated outer section there is a third heat sensor (5) for detecting room temperature. Between the inner part (1) and outer casing (2) there is a bearing plate (11), equipped with the electrical circuits of a microprocessor (6) with an A/D transformer, display and source (9) of electrical energy.<IMAGE>

Description

Ratio indicator powered by electricity

Field of the invention

BACKGROUND OF THE INVENTION The present invention relates to a ratio indicator powered by electricity for the distribution of heating costs by room radiators.

BACKGROUND OF THE INVENTION

Many different types of indicators for the distribution of room heating costs by radiators based on different principles are now known. These include, for example, control of evaporation of liquid, control of discoloration of the optical member, and the like. Furthermore, power-supplied indicators operating according to one of the following methods of indication are known.

The single-sensor method uses a single temperature sensor. It integrates the surface temperature of the radiator at a single point of the construction height of the radiator.

The two-sensor method uses two temperature sensors. One sensor integrates the temperature of one point of the radiator surface, the other sensor integrates the temperature of the heated space or another temperature that is in a defined relation to this temperature.

The mean logarithmic temperature difference method with three temperature sensors: that is, the inlet and outlet temperatures of the heat transfer medium and the temperature of the heated space.

The disadvantage of single-sensor and double-sensor indicators is a large measuring error caused by the displacement of the geometric place of the mean temperature of the radiator due to operational regulation of radiators in the range of 50 to 100% of the radiator height. Another disadvantage is the fixed start of registration for the so-called winter and summer operation, which is another source of measurement errors, especially in regulated flow rates in individual radiators.

The disadvantage of the three-sensor mean logarithmic difference indicators is the complex construction requiring the mounting of two sensors at the inlet and outlet of the heat transfer medium, which is detrimental to the compactness of the indicator and increases its cost.

SUMMARY OF THE INVENTION

The aforementioned drawbacks are largely eliminated by a ratio indicator powered by electric power to determine the remuneration for room heating by a radiator equipped with temperature sensors according to the invention. Its essence is that it consists of a compact body consisting of an inner part to which a first temperature sensor for sensing the temperature at 45 to 55% of the building height of the radiator is connected and a second temperature sensor for sensing the temperature at 55 to 100% of the building height of the radiator. An external housing is connected to the inner part of the compact body on the thermally insulated outer part of which a third temperature sensor is provided for sensing the room temperature. Between the inner part and the case there is a carrier board equipped with electrical circuits of microcomputer with A / D converter and display. The power plate is further connected to the support plate.

Preferably, the first temperature sensor and the second temperature sensor are provided with a resilient element for urging the sensors to the surface of the radiator with a constant force. The carrier plate is preferably provided with an optical data transmission element and a single push button switch.

- 1 CZ 285774 B6

The housing may be sealed to the inner portion by a seal.

The advantages of the ratio indicator according to the invention are a compact design without the need for cable connections to the sensors. The ratio indicator can be easily connected to the radiator and the external appearance of the indicator is aesthetic. Another advantage is the correct evaluation of the mean logarithmic temperature gradient as well as the evaluation of the immediate working regime - summer - winter.

The motherboard with microcomputer electrical circuits with A / D converter and display, power supply, optical data transmission and a single push button switch is compact, easy to manufacture and customized to customer requirements. The purchase price of the ratio indicator according to this technical solution is comparable with the existing indicators, while its utility properties are higher.

The resilient elements for pressing the sensors to the radiator surface with a constant force guarantee uniform temperature sensing without any inaccuracies caused, for example, by accidentally moving the indicator from the radiator surface during cleaning.

The seal between the case and the inner part secures the ratio indicator from unauthorized access.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described, by way of example, with reference to the accompanying drawing, in which: Fig. 1 is a front view of a compact indicator to be mounted on a radiator surface;

DETAILED DESCRIPTION OF THE INVENTION

The ratio indicator consists of three temperature sensors 3, 4, 5 in a compact housing attached to the radiator. The first sensor 3 senses the surface temperature of the radiator at 50% of its height. The second sensor 4 senses the surface temperature of the radiator at its 65% of the building height and the third sensor 5 senses the room temperature on the surface of the thermally insulating outer casing 2. The inner part 1 of the radiator 20 carries both temperature sensors 3, 4. springs. Between the inner part 1 of the body 20 and the outer housing 2 there is a printed circuit board 11 which further carries the mechanical and electronic components of the indicator hardware and separates the space of the inner part 1 and the outer housing 2 of the body 20. 7 for data transmission, a microcomputer 6 with an A / D converter and displaying data, a button switch 8 for searching for the desired information and a power supply 9 in the form of a battery. The housing 2 is connected to the inner part 1 by a seal 10 which prevents unauthorized access to the interior of the indicator.

The function of the indicator is based on the relation for radiator heat output Q = kA (δο - δ _Γ ), where it indicates Q - heat output, k - heat transfer coefficient between the radiator and room heating air, A - radiator surface area, δο - medium radiator temperature, δ _Γ - reference temperature or room temperature.

The signals of the sensors 3, 4, 5 are processed by a microcomputer 6, which enables the determination of the mean logarithmic temperature gradient and the operating mode of the radiator according to winter or summer conditions. Microcomputer 6 also provides the following functions: A / D data conversion

-2E 285774 B6 all sensors, indication of instantaneous heating intensity, integration of supplied heat (relative value), calendar defining winter period (heating season) and summer period, storage of the indicated data for the previous accounting period with the possibility of its transmission by optical way to determine when the thermal conditions correspond to winter or summer operation, identification of the individual indicator - their serial number, sequential display of individual data - information on the command from outside with a single push button 8.

Industrial applicability

The surface mount indicator of the radiator according to the present invention is suitable for determining the pro rata remuneration for heating per individual room or apartment of the total amount charged by the heat supplier to the unit of account.

Claims (5)

PATENT CLAIMS 1. A ratio indicator supplied with electricity for determining the room heating fee, having a temperature sensor, comprising a compact body (20) consisting of an inner part (1) to which the first sensor (3) is connected. temperature for sensing the temperature in 45 to 55% of the building height and a second temperature sensor (4) for sensing the temperature in the 55 to 100% of the building height and from the outer housing (2) on whose thermally insulated outer part is located A temperature plate for sensing the temperature of the room, wherein between the inner part (1) and the outer case (2) there is a support plate (11) provided with electrical circuits of a microcomputer (6) with an A / D converter and display and power supply (9). Ratio indicator according to claim 1, characterized in that the first temperature sensor (3) and the second temperature sensor (4) are provided with a resilient element for pressing the sensors (3, 4) against the radiator surface with a constant force. Ratio indicator according to claim 1 or 2, characterized in that the carrier plate (11) is provided with an optical data transmission element (7). Ratio indicator according to claim 1, 2 or 3, characterized in that the support plate (11) is provided with a single push button switch (8). Ratio indicator according to any of the above claims, characterized in that the housing (2) is connected to the inner part (1) by a seal (10).