Experimental study of liquid phase heat capacity of dimethyl ether and triethylene glycol solution.

New experimental data for the isochoric heat capacity for pure DME (dimethyl ether), pure TEG (triethylene glycol) and DME/TEG solutions have been reported in the paper. We also present the description of the experimental setup that realizes method of direct heating in adiabatic calorimeter. The calorimeter has been used for experimental investigation of the two-phase isochoric heat capacity for pure DME, TEG as well as DME/TEG solution at weight fractions of DME 20.8%, 74.7% in temperature range from 152 to 324 К. The procedure of fitting for the obtained experimental data is reported. The analysis shows that mean uncertainty of measured data does not exceed 0.75%. The temperature and weight fraction dependence for the heat capacity of liquid phase for the mixture of dimethyl ether - triethylene glycol are described in the paper.

本文报道了纯二甲醚（DME，dimethyl ether）、纯三乙二醇（TEG，triethylene glycol）及DME/TEG溶液的等容热容新实验数据。我们还描述了实现绝热热量计直接加热法的实验装置。该热量计用于研究纯DME、纯TEG以及DME质量分数为20.8%和74.7%的DME/TEG溶液在152至324 K温度范围内的两相等容热容。本文报道了所得实验数据的拟合过程。分析表明，测量数据的平均不确定度不超过0.75%。此外，本文描述了二甲醚-三乙二醇混合物液相热容随温度及质量分数的变化关系。