SU1249351A1 - Device for measuring power characteristics of solar-energy reflectors - Google Patents

Abstract

The invention relates to thermometry and allows for improved measurement accuracy. For this purpose, heat-insulating gaskets 13 and protective covers 14 forming the cooled cavity 15 are installed in the heat-receiving zones 8 of the coil 6. The non-working zones of the coil are placed in containers connected by channels and connected to the cooling system. The cooling coil 6 environment in the heat-receiving zones is heated from the reflectors. At the moment of determining the energy characteristics of the reflectors in the coil 6, the required temperature is maintained by varying the flow rate of the medium in the cavity 15. The walls of the channels can be covered with thermal insulation. T h.p; f-ly, 9il. (L with cd

Description

The invention relates to heat metering and can be used in devices for measuring the energy characteristics of solar thermal reflectors.

The aim of the invention is to improve the measurement accuracy.

FIG. 1 shows a device in plan with a cylindrical protective cover; in fig. 2 - the same, with a trapezoidal protective cover; in fig. 3 - placing the device on the heating surface of the steam generator; in fig. 4 is a variant of mutual placement of the heating surface of the steam generator and the device with a flat heat-receiving surface in FIG. 5 shows a variant of the scheme for supplying and discharging a cooling medium in a device in which the cooling tank is located outside the heat-receiving zones of the calorimetric coil; in fig. 6 is a scheme for supplying and discharging a cooling medium in a device in which the cooling capacity is implemented in the form of jackets connected by channels placed in cooled pofig.

FIG. FIG.

7- section AA on

8-section BB on

9- section bb on

In the presented embodiments, in front of the panels 1 of the steam generator 2, consisting of pipes 3, is placed a device 4 for measuring the energy characteristics of solar thermal reflectors 5, containing a calorimetric coil 6 with temperature sensors 7 measuring the temperature of the medium. The coil 6 has alternating heat-receiving 8 and non-operating 9 zones, the latter of which are placed in tank 10 with pipes P and 12, respectively, of the inlet and outlet, connected to a cooling system (not shown). The coil 6 in the heat-receiving zones 8 is provided with a thermally insulating pad 13 attached to the back surface, adjacent to this surface, and a protective casing 14 forming the cooled surface 15 with the pad.

In embodiments of the device (Fig. 6-9), the tank 10 is made in the form covering the non-working zones 9 of the coil 6 shirts 16, interconnected by channels 17, size

in the cooling cavities 15. The heat insulating gasket 13 can be made hollow and evacuated. The walls of the channels 17 can be covered with thermal insulation 18 (Fig. 9). The device 4 is equipped with a flow meter environment, pumped through the coil 6, and sensors 13 temperature gasket.

The device works as follows.

Ensure the efficiency of the steam generator 2 and serves a cooling medium in the coil 6, in the tank 10

5 and cavity 15. The target m. Solar reflectors 5 on the steam generator 2.

When the device is cooled, The coil 6 environment in the heat-receiving zones 8 is heated by the heat of the solar radiation from the reflectors 5. Thermal sensors 7 determine its temperatures at different distances from the input of the heat-receiving zones 8.

5 When heated, in zones 8, the medium in the tank 10 is cooled to the desired value, for example, equal to the initial one at the entrance to the coil 6. The medium supplied in the cavity 15 in the heat-receiving zones 8 receives heat from the steam generator 2, thereby eliminating an unacceptable increase in the gasket temperature 13.

The medium flowing in the channels 17 from one tank 10 to the other can cool the medium in the cavity 15 (Fig. 7). It is also possible to exclude heat exchange between the fluid flows in the channels 17 and the cavity 15 (Fig. 9).

During the period of determining the energy characteristics of the reflectors 5, by changing the flow rates of the cooling medium in the tank 10 and the coil 6 in the latter, the temperature is maintained. If the latter is equal to the temperature of the air surrounding the coil, convective heat exchange is eliminated and, accordingly, the need to determine and take into account the indicated error component.

0

five

0

five

0

The energy characteristics of the reflectors are the distribution of densities of incident radiation fluxes on the surfaces of the steam generators 2 and, accordingly, the heat-receiving zones 8 of the coil 8, placed between the steam generator 2 and the reflectors 5. Density is falling3

The radiation flux is determined by calorimetry, based on measuring the amount of heat transferred per unit surface per unit of time from the reflectors, and the heat absorbed by the surface unit of the heat-receiving zones 8 for a certain period of time. To determine the amount of heat received, periodically, the consumption of sulfur pumped through the coil 6, and through the thermal sensors 7, the increment of the temperature of the cooling medium along the length of the heat-receiving zones 8 of the coil 6 The design and non-working areas of the coil during the design, as well as the ratio of the medium through the tanks and the coil during operation of the device, can ensure the specified accuracy of measuring the heat fluxes of radiation. By varying the flow rate of the medium in the cavity, the temperature of the protective housing is maintained within acceptable limits.

3 / I VJ f 6. 8 FIG. 2

(5 f / 3

13

rm

l and a 3

four

arr

et e and

Claims (2)

1. A device for measuring the energy characteristics of solar thermal reflectors, containing a coil with thermal sensors placed in it, a flow meter and tanks of the cooling system, in which non-working areas of the coil are located, characterized in that In order to improve measurement accuracy, hollow protective covers and thermal insulation pads are inserted into it, the covers are installed in the heat-sensing zones of the coil on the back side of its surface, separated from it by thermal insulation pads and connected to the cooling system, and the tanks are interconnected by channels . 2. The device according to claim 1, about tl and - the fact that the channels connecting the containers, are placed in hollow protective covers. FIG. five W b.9 Vl-rl /   A- FIG. 7 bb fPus.S Fig.Z Editor P. Tsitsika Compiled by B, Kopaev Tehred N. Bonkalo Proofreader G. Reshetnik Order 4225/41 Circulation 778 VNIIPI USSR State Committee for inventions and discoveries 113035 Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Subscription