Liquid specific heat capacity measuring system and measuring method

Abstract

The invention discloses a liquid specific heat capacity measuring system and measuring method. The system comprises a power part, a preheating part, a testing part, a pressure control part, a sampling part and a data processing part, wherein the power part, the preheating part, the testing part, the pressure control part and the sampling part are sequentially connected and communicated through pipelines, and the data processing part is electrically connected with the testing part and the power part; wherein the testing part specifically comprises a heat preservation device, a testing pipeline, a heating device and cooling pipes, the heat preservation device is arranged on the testing pipeline, the heating devices are arranged on the two sides of the testing pipeline, the cooling pipes are arranged below the testing pipeline, and cooling gas is introduced into the heating devices. According to the invention, a multi-parameter and multi-channel data acquisition measurement and control technology and a real-time measurement and control and data post-processing technology are realized.

Description

technical field [0001] The invention relates to the technical field of analysis and measurement devices, and more specifically relates to a liquid specific heat capacity measurement system and a measurement method. Background technique [0002] At present, specific heat capacity is one of the important thermophysical parameters of substances. The accurate measurement of specific heat capacity plays a very important role in identifying the purity of substances, studying the structure of substances, and testing the equation of state. Research and many engineering designs related to chemical industry, energy and materials are of great significance. [0003] However, the basic principle and measurement method of liquid specific heat measurement have not changed much, and the key to its advancement lies in the accurate measurement of liquid heat change and temperature. Abroad, Ernst et al. from the University of Karlsruhe in Germany first built an experimental device suitable fo...

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Problems solved by technology

At present, the instruments that can measure the specific heat of liquids formed on the market are: 1) The C80 microcalorimeter of the French Setaram Company, the temperature range is from room temperature to 300 ° C, and this project needs to measure the temperature of the liquid at -40 ~ 350 ° C Specific heat capacity; 2) KD2Pro thermal characteristic analyzer of American DECAGON company, the temperature range is -50 ~ 150 ℃, the specific heat measurement accuracy is 5%, and its temperature range and measurement accuracy cannot meet the requirements of this project; 3) Kyoto Electronics Industry, Japan SHA-500 Liquid Specific Heat Capacity Meter of Co., Ltd. (KEM), the temperature range is 4~85℃, and the temperature range is narrow

4) The HC2000 liquid specific heat meter of China's Xi'an Xiaxi Electronic Technology Co., Ltd. has a temperature measurement range of -20 to 150 °C; most of the others are relatively simple, with a relatively low degree of integration and automation, and their application range is limited. It is difficult to meet high temperature or Measurement requirements for specific heat capacity of liquids in low temperature regions

[0004] In summary, the existing liquid specific heat capacity measuring instruments and equipment have narrow temperature measurement range, low precision, and low degree of integration and automation. It is difficult to meet the needs of liquid specific heat capacity measurement in high temperature or low temperature areas. High-precision specific heat capacity measuring instrument

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