RU2544365C2 - Device for heat exchanger operation parameter measurement - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention claims a device for heat exchanger operation parameter measurement, including heat-insulated case of steam generator with cover, insulators, electrodes, heat exchanger connected by pipeline with the cover and bottom part of steam generator, expansion vessel, measurement and computation unit connected to electrodes. Additionally the device includes circulation pump with output connected to heat exchanger input and input connected to steam generator output, liquid and gas flow meters installed in input pipelines, heat carrier pressure and temperature gauges installed at heat exchanger input and output and connected functionally to the measurement and computation unit. Heat exchanger output is linked to steam generator input.

EFFECT: increased range of measured values, extended functional capacities of device.

1 dwg

Description

The invention relates to heat engineering and can be used to measure the performance of heat exchangers.

Known electrode boiler (see RF patent No. 2279605, publ. 07/10/2006. Bull. No. 19), including a thermally insulated body with a cover, insulators with electrodes, a heat exchanger with pipelines and an expansion tank with a pressure gauge connected by a pipe to the bottom of the electrode boiler. The heat flux is measured by a measuring device (ammeter) in case of stationary heat transfer under conditions of a balance of the generated and dissipated heat flux. To increase the accuracy of measurements, the pressure drop in the system is compensated by a compressor. The disadvantage of this invention is the low productivity of the process of measuring and calculating heat transfer parameters and the limited nature of the measured parameters and ranges.

A device is known for measuring the heat efficiency of heat exchangers (Patent for the invention of the Russian Federation No. 2352925 C1, 04.20.2009, Bull. No. 11), including a thermally insulated body with a cover, insulators, electrodes, a heat exchanger connected by a pipeline to the cover and the lower part of the body, expansion and heating tanks , a measuring and computing unit connected to the electrodes and a pressure sensor installed in a thermally insulated housing, and the thermally insulated housing is an expansion tank in which the heating capacity with the possibility of fluid flow.

The disadvantage of this invention is the limitedness of the measured parameters and ranges.

The technical result of the invention is to increase the productivity of the process, increasing the ranges of measured values and expanding the functionality of the device.

The problem is solved in that the device for measuring the performance of heat exchangers, including a thermally insulated steam generator housing with a cover, insulators, electrodes, a heat exchanger connected by a pipeline to the cover and the lower part of the steam generator housing, an expansion tank, a measuring and computing unit connected to the electrodes contains a circulation pump the output of which is connected to the inlet of the heat exchanger, and the input of the circulation pump is connected to the output of the steam generator, liquid and gas flow meters, anovlennye on the input lines, pressure sensors and coolant temperature set at the inlet and outlet of the heat exchanger operably connected to the measuring and computing unit, wherein the heat exchanger output is connected to the inlet of the steam generator.

The drawing shows a schematic diagram of a device for measuring the performance of heat exchangers.

The device comprises a steam generator housing 1 with a cover 2, covered with a layer of thermal insulation 3, electrodes 4 with bushing 5, a heat exchanger 6, the input of which is connected by a pipe 7 to the output of the steam generator housing 1, and the output - by a pipe 8 with the input of the steam generator housing 1. To the lower part of the housing the steam generator 1 is connected to an expansion tank 9 with valves for filling the circuit with water 10.1 and supplying or discharging air 10.2. The expansion tank 9 is located above the level of the bleed air valve 10.3 located on the heat exchanger 6. The lower part of the steam generator body 1 is equipped with a valve 10.4 for draining water from the circuit, and the cover 2 has an opening connected to a valve 10.5 for bleeding air from the upper part of the steam generator body 1. Power supply and control of the elements of the device, namely: electrodes 4, circulation pump 11, fan 12, is carried out from the control cabinet 13, and the registration and calculation of the working process parameters of the heat exchanger 6 is carried out by means of a measuring and computing unit 14, which is electrically connected to a control cabinet 13, electrodes 4, pressure sensors 15.1-15.5, temperature sensors 16.1-16.4, heat flow meters 17.1 and 17.2. Pressure sensors 15.1-15.5 and temperature sensors 16.1-16.4 are installed at the inlet and outlet of the heat exchanger 6.

A device for measuring the performance of heat exchangers works as follows. Before starting work with valve 10.1, the system consisting of elements 1, 6, 7, 8, and 9 is filled with water, and valves 10.2, 10.3, and 10.5 remain open. The drain valve 10.4 is closed. After the air is displaced by water from the system elements, the valves in the sequence 10.5, 10.3, 10.1 and 10.2 are closed. The valve 10.6 remains open and serves to control the pressure in the system depending on the required pressure (vacuum), which is achieved using external devices (not shown in the drawing). Power supply (alternating voltage 220 (380) V) from the control cabinet 13 is supplied to the electrodes 4 and the electric drive of the circulation pump 11, as a result of which there is heating of water in a closed circuit and structural elements. The electric power (heat flux) developed by the electrode assembly should be greater than the maximum heat load on the heat exchanger 6 (fan 12 is turned on with maximum performance). After warming up the device for measuring the performance of heat exchangers to the boiling point, vaporization occurs, as a result of which the vapor phase P (minimum heat load, fan 12 is off) displaces the liquid phase of water W into expansion tank 9 (the volume of which is significantly larger than the volume of the formed vapor phase). The constancy of the heat load on the heat exchanger 6 of the proposed device leads to a balance of the generated and dissipated power (heat flux) in the conditions of stationary heat transfer with a constant temperature difference between a sufficiently large volume of the cooled medium (measurements can be carried out outdoors, outdoors) and heated to operating temperature device surfaces.

To measure the heat flux when changing the nature of the movement of the cooling medium that occurs when modeling a given heat load by means of fan 12, it is necessary to turn on the fan drive (it can be a DC motor or another drive with the ability to change the speed), maintain the proposed device until it reaches balance dissipated and generated power and record the obtained values q ₁ = P ₁ .

и выходе $$t_{\text{W}}^{\text{вых}},$$

а также охлаждающего воздуха на входе $$t_L^{\text{вх}}$$

и выходе $$t_{\text{L}}^{\text{вых}}$$

теплообменника 6. Дополнительно измеряют и регистрируют значения расходов воды G_W и воздуха G_L.By means of the measuring and computing unit 14, the heat flux q ₀ = P ₀ , q ₁ = P ₁ dissipated by the heat exchanger 6 is measured and recorded according to the reading of the W meter; the value of the hydraulic and aerodynamic pressures of the coolants Δp _W and Δp _L ; temperature: water inlet $$t_W^{\text{in}}$$

and exit $$t_{\text{W}}^{\text{out}},$$

as well as cooling air inlet $$t_L^{\text{in}}$$

and exit $$t_{\text{L}}^{\text{out}}$$

heat exchanger 6. Additionally measure and record the values of the flow rate of water G _W and air G _L.

The measurement of heat fluxes and other parameters at other heat loads and modes of motion of the coolant is carried out similarly.

Thus, in comparison with the prototype, the claimed device allows to increase the productivity of the process by registering the parameters and their processing by the measuring and computing unit, to increase the range of measured values and expand the functionality of the device, i.e. to measure the heat flux under various modes of hydraulic and aerodynamic motion of the coolants and in the intervals of the studied characteristics.

Claims (1)

A device for measuring the performance of heat exchangers, including a thermally insulated steam generator housing with a cover, insulators, electrodes, a heat exchanger connected by a pipe to the cover and the lower part of the steam generator housing, an expansion tank, a measuring and computing unit connected to the electrodes, characterized in that the device contains a circulation pump the output of which is connected to the input of the heat exchanger, and the input of the circulation pump is connected to the output of the steam generator, liquid and gas flow meters, lennye on the input lines, pressure sensors and coolant temperature set at the inlet and outlet of the heat exchanger operably connected to the measuring and computing unit, wherein the heat exchanger output is connected to the inlet of the steam generator.