CN201508280U - Solar collector thermal performance testing device - Google Patents

Abstract

A thermal performance detection device for a solar heat collector, including a refrigerator and a circulating pump, which are connected by pipelines. Heater, in front of each electric heater is respectively equipped with a temperature measuring element, the signal output end of the temperature measuring element is connected with the input end of the PID regulator, and the corresponding output end of the PID regulator is respectively connected with the corresponding The electric heater control terminal connection. The advantage is that the water tank of the traditional open circuit test device is removed, the manufacturing cost is reduced, and the floor area is greatly reduced; the electric heater is controlled by the PID regulator according to the temperature measuring element, so that the device has a fast heating and cooling speed and a short test time. High work efficiency; less water consumption, low detection cost, and good system stability.

Description

Solar collector thermal performance testing device

technical field

The utility model particularly relates to a thermal performance detection device of a solar heat collector.

Background technique

The solar collector is the key light-to-heat conversion component in the solar water heating system, and it is very important to test its thermal performance index. For this reason, the national standard GB/T4271 requires the temperature stability of the collector inlet to be ±0.1°C. At present, a static open-circuit test device is mostly used for thermal performance detection of heat collectors. It is a circulation path formed by a refrigerator, at least two water tanks, and a circulation pump connected in series with the heat collector through pipelines. The problems of this device are: 1. The manufacturing cost is high, the equipment is bulky, the floor area is also large, and the installation project is complicated; 2. Due to the large volume of the water tank, it takes a long time to heat up and the entire test cycle is also long; 3. Water resources will be wasted during the test process , greatly increasing the detection cost.

Contents of the invention

The purpose of the utility model is to provide a thermal performance detection device for solar heat collectors with low manufacturing cost, small footprint, fast temperature rise and fall, short test time, less water consumption and good system stability.

The utility model is realized in the following way: it includes a refrigerator and a circulation pump, which are connected by pipelines, and its special feature is that two or three electric heaters are arranged on the pipeline between the refrigerator and the inlet of the circulation pump , in front of each electric heater is respectively provided with a temperature measuring element, the signal output end of the temperature measuring element is connected to the input end of the PID regulator, and the corresponding output end of the PID regulator is respectively connected to the corresponding electric Heater control terminal connection.

The above-mentioned thermal performance detection device of the solar heat collector is provided with a water diversion valve in front of the refrigerator, and the refrigerator is connected to a branch of the water diversion valve.

The utility model has the advantages that: the water tank of the traditional open circuit test device is removed, the manufacturing cost is reduced, and the occupied area is greatly reduced; the temperature control circuit is formed by the temperature measuring element, the PID regulator and the electric heater, so that the detection The heating and cooling speed of the device is fast, the test time is short, and the work efficiency is high; the water consumption is small, the detection cost is low, and the system stability is good.

Description of drawings

Fig. 1 is the structural representation of the utility model;

In the figure: circulation pump 1, pipeline 2, heat collector 3, water diversion valve 4, refrigerator 5, temperature measuring element 6, PID regulator 7, electric heater 8.

Detailed ways

As shown in the figure, the utility model has a refrigerator 5 and a circulation pump 1, the refrigerator 5 and the circulation pump 1 are connected through a pipeline 2, and the pipeline 2 connecting the refrigerator 5 and the circulation pump 1 is provided with Two or three electric heaters 8, the present embodiment takes three electric heaters 8 as example, on the pipeline 2 that is positioned at the front of each electric heater 8, be respectively provided with temperature-measuring element 6, the temperature-measuring element 6 The signal output terminal is connected with the input terminal of the PID regulator 7, and the three sets of control output terminals of the PID regulator 7 are respectively connected with three electric heaters 8. The detection device is also provided with a water diversion valve 4, and the water diversion valve 4 divides into two branches, the refrigerator 5 is installed on one of the branches, and the rear ends of the two branches are connected in parallel.

When working, first connect the water outlet and water inlet of the heat collector 3 with the refrigerator 5 and the circulation pump 1 respectively to form a closed circuit through the connecting pipeline, fill the pipeline 2 system with water, and start the circulation pump 1 to circulate. During the test, it is required that the temperature at the water inlet of the heat collector 3 can be set arbitrarily within the range of 10°C to 90°C, and the stability is ±0.1°C, and the stabilization time is not less than 30 minutes. After the water is heated by the heat collector 3, the temperature can increase by about 5°C, and then part of it flows to the refrigerator 5 through the water diversion valve 4, and the other part directly flows through and mixes with the cooled water. The temperature of the mixed water is higher than that of the heat collector. The water temperature at the water inlet of the collector 3 is 2°C lower, and then the PID regulator 7 controls the electric heater 8 to work according to the temperature measured by the temperature measuring element 6, and finally ensures that the temperature of the water flowing to the water inlet of the collector 3 reaches the set value. And stable in the range of 0.1 ℃.

Claims (2)

1. A thermal performance detection device for a solar heat collector, comprising a refrigerator and a circulating pump, connected by pipelines therebetween, characterized in that: two or three electric circuits are arranged on the pipeline between the refrigerator and the inlet of the circulating pump. Heater, in front of each electric heater is respectively equipped with a temperature measuring element, the signal output end of the temperature measuring element is connected with the input end of the PID regulator, and the corresponding output end of the PID regulator is respectively connected with the corresponding The electric heater control terminal connection. 2. The thermal performance detection device for solar collectors according to claim 1, characterized in that: a water diversion valve is provided in front of the refrigerator, and the refrigerator is connected to a branch of the water diversion valve.

Images