A refrigerant mixture TJR02 was developed and the comparison experiment was performed on a singlestage vapor compression refrigeration system originally designed for R22.Experimental results show that TJR02 can be dir...A refrigerant mixture TJR02 was developed and the comparison experiment was performed on a singlestage vapor compression refrigeration system originally designed for R22.Experimental results show that TJR02 can be directly used in the system without modifying the original system or changing lubricant.By replacing R22 with TJR02,cooling rate gets faster and at least 20% of energy is saved.The actual detection in the standard test-bed verifies the experimental results and indicates that the adoption of TJR02 leads to greater efficiency and wider application.And the lower the refrigeratory temperature is,the more obvious the energy saving effects will be.展开更多
The exploitation of new methodologies and indicators is considered valuable in measuring a key macroeconomic indicator like the external debt. The recent Portuguese economic developments illustrate the need and useful...The exploitation of new methodologies and indicators is considered valuable in measuring a key macroeconomic indicator like the external debt. The recent Portuguese economic developments illustrate the need and usefulness of having a multidimensional approach of this indicator, with several balance of payment items, such as the current and the capital account balances, the foreign direct investment or the reserves assets being carefully analysed when reading the external conditions faced by the economy. Only such an approach can provide with a comprehensive measure of external debt consistent across the range of debt instruments, institutional sectors and valuation methods used. This paper develops an assessment of external debt measures and concludes about their potential advantages and disadvantages. Comparisons are made by focusing on alternatives like gross external debt against net external debt, external debt vis-h-vis international investment position, and external debt at nominal value against external debt at market value.展开更多
基金Supported by the Key Technology R&D Program of Tianjin,China(No.11ZCKFGX21100)Tianjin New Coastal District "Ten Campaign" Major Science and Technology Project(No.2010-BK140009 and 2010-BK140002)+1 种基金National Basic Research Program of China("973" Program,No.2009CB219900)the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT0936)
文摘A refrigerant mixture TJR02 was developed and the comparison experiment was performed on a singlestage vapor compression refrigeration system originally designed for R22.Experimental results show that TJR02 can be directly used in the system without modifying the original system or changing lubricant.By replacing R22 with TJR02,cooling rate gets faster and at least 20% of energy is saved.The actual detection in the standard test-bed verifies the experimental results and indicates that the adoption of TJR02 leads to greater efficiency and wider application.And the lower the refrigeratory temperature is,the more obvious the energy saving effects will be.
文摘The exploitation of new methodologies and indicators is considered valuable in measuring a key macroeconomic indicator like the external debt. The recent Portuguese economic developments illustrate the need and usefulness of having a multidimensional approach of this indicator, with several balance of payment items, such as the current and the capital account balances, the foreign direct investment or the reserves assets being carefully analysed when reading the external conditions faced by the economy. Only such an approach can provide with a comprehensive measure of external debt consistent across the range of debt instruments, institutional sectors and valuation methods used. This paper develops an assessment of external debt measures and concludes about their potential advantages and disadvantages. Comparisons are made by focusing on alternatives like gross external debt against net external debt, external debt vis-h-vis international investment position, and external debt at nominal value against external debt at market value.
