| 摘要 |
A method for determining the values of such refrigeration process parameters as those by means of which the efficiency of the process can be established. The refrigerating process is carried out with the aid of a refrigerant which is circulated through a closed circuit which incorporates a compressor, a condenser, an expansion device, and an evaporator. Mutually corresponding measurement values of the refrigerant pressure and temperature upstream and downstream of the compressor and downstream of the condenser are collected in a computer, it being assumed that the pressure of the medium downstream of the condenser is the same as that downstream of the compressor. These values are utilized to determine, with the aid of information stored in the computer defining the refrigerant diagram for the refrigerant used, three key points K1, K2 and K3 on the refrigerant diagram. Process parameters required for assessing the efficiency of the refrigerating process, such as vapourization temperature, condensing temperature, overheating, undercooling and the ideal coefficient of performance of the process are then determined on the basis of these key points, while using the information defining the refrigerant diagram stored in the computer. The true or prevailing coefficient of performance of the process is then calculated as the product of the ideal coefficient of performance and a correction factor which, inter alia, compensates for losses in the process. |
