A liquid constant pressure specific heat capacity measuring device

Abstract

The invention discloses a liquid constant pressure specific heat measurement device comprising a temperature control system, a flow meter, a collecting bottle, a heat measurement pipe and a liquid pool, wherein the collecting bottle is placed in a tray of the flow meter, the heat measurement pipe is of a cubic flat structure, thermoelectric temperature control chips are arranged on the surfaces of the heat measurement pipe and the liquid pool, the power output end of the temperature control system is connected to the thermoelectric temperature control chips, the temperature data acquisition end of the temperature control system is installed at the exit of the heat measurement pipe, the collecting bottle and the heat measurement pipe are communicated with the liquid pool, a flow valve is arranged in a pipeline between the heat measurement pipe and the liquid pool, the liquid pool is provided with a liquid injection valve and a pressure adjusting pipe, the pressure adjusting pipe is connected with an air bag and a vacuum pump, an inflation valve is arranged on a pipeline between the air bag and the pressure adjusting pipe, and a pumping valve is arranged on a pipeline between the vacuum pump and the pressure adjusting pipe. The liquid constant pressure specific heat measurement device disclosed by the invention integrates the temperature control system, a pressure adjusting system and a measurement system, and is simple in structure, convenient to use and low in cost, and the structure of the heat measurement pipe is improved to strengthen the heat transfer property.

Description

technical field [0001] The invention relates to a measuring device, in particular to a liquid constant pressure specific heat capacity measuring device. Background technique [0002] Specific heat capacity at constant pressure is an important index to measure the thermodynamic properties of liquids and an important calorimetric property in the thermophysical property database. It is not only an important parameter for testing the state equation, but also the basic data for scientific research and engineering practice. Indispensable thermophysical property data in fields such as energy power and new materials. Experimental measurement is the only source of accurate data on specific heat capacity, which makes experimental research on specific heat capacity of liquids at constant pressure particularly important. In addition, with the continuous development of material science and engineering technology, various new refrigerants have emerged, such as R134a, R600a, R152a, etc. ...

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Problems solved by technology

[0003] The traditional liquid constant pressure specific heat capacity measurement device is limited by the workplace, volume, weight, accuracy, cost, etc., and its use is relatively limited. The specific heat capacity of liquid at constant pressure is usually measured by the traditional non-flow measurement method, and the specific heat capacity of liquid under high temperature and high pressure conditions is often measured by the flow type measurement method), it is impossible to obtain the constant pressure specific heat capacity of new working fluid materials at lower temperatures or pressures, The specific reasons are as follows:

[0004] 1. The use of traditional liquid constant pressure specific heat capacity measuring devices is relatively limited. For measuring devices based on non-flowing measurement methods, the measurement accuracy is limited, the repeatability is poor, and there is no pressure regulating device;

[0005] 2. For the measuring devices based on the flow-type measurement method, the volume and quality are often huge, and it needs to be measured in a specific occasion, which is inconvenient to use;

[0006] 3. The temperature control part of the traditional liquid constant pressure specific heat capacity measurement device cannot perform bidirectional adjustment of positive temperature and negative temperature, and the temperature control has relatively large limitations, so it cannot measure the liquid specific heat capacity at low temperature;

[0007] 4. The pressure regulating device equipped with the high temperature and high pressure liquid specific heat capacity measuring device based on the flow type measurement method only has the function of pressurizing, and the system is complicated and huge, and the pressure regulating process is complicated

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