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Equivalent expansion test system and method for researching two-phase expansion process

A technology of testing system and expansion process, applied in the direction of thermal expansion coefficient of materials, testing of machine/structural components, measuring devices, etc., can solve problems such as high cost and long cycle, and achieve high cost, controllable operating conditions, disassembly convenient effect

Active Publication Date: 2021-04-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for studying two-phase The equivalent expansion test system and method of the expansion process get rid of the limitations of the structure and operating characteristics of the expander, and can be applied to the internal process test research of two-phase expanders of various types and various working fluids

Method used

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  • Equivalent expansion test system and method for researching two-phase expansion process
  • Equivalent expansion test system and method for researching two-phase expansion process
  • Equivalent expansion test system and method for researching two-phase expansion process

Examples

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Embodiment 1

[0045] Such as Figure 4 As shown, the equivalent expansion test method of the present invention can adopt an open cycle.

[0046] The working fluid output module of the open system is directly connected to the atmosphere.

[0047] 1) Preparations before the start of the test: Check each test equipment to ensure that each test equipment is in good condition; keep the test system at the highest pressure operating condition to test the air tightness of the test system; calibrate the test instruments; Fill reservoir 1 with quality; close the valve on the test system.

[0048] 2) Testing phase:

[0049] Open stop valve 44-46, communicate with vacuum pump 9, vacuum tank 8, constant volume flash chamber 4 and working medium heating tank 3, use vacuum pump 9 to evacuate it; close all valves; open stop valve 42 again, the working medium Inject the working fluid into the heating tank 3, heat the water to the initial temperature; introduce the working fluid into the constant volume f...

Embodiment 2

[0051] Such as Figure 5 As shown, the equivalent expansion test method of the present invention can adopt closed loop.

[0052] The working medium output module of the closed cycle recovers the working medium into the liquid storage tank 1, and this embodiment uses the constant volume flash chamber 4 with heating function, so the working medium heating tank 3 is removed.

[0053] 1) Preparations before the start of the test: Check each test equipment to ensure that each test equipment is in good condition; keep the test system at the highest pressure operating condition to test the air tightness of the test system; calibrate the test instruments; Fill reservoir 1 with quality; close the valve on the test system.

[0054] 2) Test stage: after starting the test, first heat the temperature of the constant volume flash chamber 4 to the initial temperature for preheating; open the valves 53 and 54, connect the vacuum pump 9, the vacuum tank 8 and the constant volume flash chamber...

Embodiment 3

[0056] Such as Image 6 As shown, the equivalent expansion test method of the present invention can adopt a non-moving component cycle.

[0057] The circulation of non-moving parts does not use the working medium pump 2 and the compressor 10, and this embodiment uses the vacuum tank 8 with a condensing device, so the external condenser 11 is removed.

[0058] 1) Preparations before the start of the test:

[0059] Reasonably arrange the vacuum tank 8, the liquid storage tank 1 and the constant volume flash chamber 4 to ensure that the lowest point of the vacuum tank 8 is higher than the highest point of the liquid storage tank 1, and the lowest point of the liquid storage tank 1 is higher than the highest point of the constant volume flash chamber 4. point; check each test equipment to ensure that each test equipment is in good condition; keep the test system at the highest pressure operating condition to test the air tightness of the test system; calibrate the test instrument...

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Abstract

The invention discloses an equivalent expansion test system and method for researching a two-phase expansion process. The test system comprises a flash evaporation working condition adjustment test module, a working medium input module, a working medium output module and a data acquisition assembly; the flash evaporation working condition adjustment test module comprises a constant-volume flash evaporation cavity, a mass flow meter, a pressure adjusting valve and a vacuum tank which are connected in sequence; the data acquisition assembly comprises a pressure sensor and a temperature sensor which are arranged in the constant-volume flash evaporation cavity and are used for measuring gas-phase and liquid-phase states; solid boundaries geometrically similar to various types of expanders are arranged in the constant-volume flash evaporation cavity, the solid boundaries are driven by the constant-volume flash evaporation cavity to rotate, and boundary disturbance similar to and geometrically similar to actual expander motion is provided. The test method is simple and effective, and solves the problems that key parameters are difficult to measure in previous two-phase expansion test research, the cost for changing a variable-speed expansion curve and a solid boundary disturbance form is high, and the period is long.

Description

technical field [0001] The invention belongs to the field of expansion testing, and in particular relates to an equivalent expansion testing system and method for studying two-phase expansion processes. Background technique [0002] As an important part of my country's energy strategy, it is imminent to improve the utilization rate of low-grade thermal energy such as geothermal energy, industrial waste heat, and solar energy. The two-phase expander is the key equipment in the recovery of waste heat in the triangular flash cycle and the recovery of throttling loss in the refrigeration system. However, the low level of measured efficiency and the lack of efficiency-enhancing technical means are the bottleneck technical problems that restrict the popularization and application of two-phase expanders. The two-phase expansion process inside the expander belongs to the non-equilibrium flash phase transition process. [0003] Expander efficiency is limited by the intensity of the...

Claims

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Application Information

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IPC IPC(8): G01M99/00G01N25/16G01N25/12G01N25/14
Inventor 吴伟烽李晓然张寅李程翊王江峰何志龙
Owner XI AN JIAOTONG UNIV
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