Environmental concerns and the restriction policy on the energy efficiency require continuous improvements in refrigerator energy efficiency. Hence, it is very important to manufacture household refrigerators with the shroud form and cold air flow that are economically acceptable. This study has been performed on cold air flow characteristics in a domestic refrigerator which sizes are 400mm x 410mm x 670mm of the freezer and 510mm x 710mm x 670mm of the cold storage room with a fan. The domestic refrigerator is divided into two completely parts, which one is for cooling the freezer and the other is for cooling the food room. This domestic refrigerator has an evaporator, in which is located the freezer compartment. The experiments were conducted at three different internal temperatures in the freezer (10℃, 30℃). It was showed that the rate of cold air distribution into freezing room and cold storage room was almost 7 : 3. This experimental investigation indicates that the velocity of cold air flow of 40mm, 80mm, 370mm and 670mm sections are faster than other sections.
The first objective of this work was the analysis of the result to obtain insight regarding the effects of the variables and to assess the cold air flow characteristics at three different internal temperatures in the freezer and at two different internal temperatures cold storage room. The second consideration was to develop refrigerator energy consumption. in other words, This paper presents to improve that the energy efficiency of the refrigerator. (5℃, 15℃, 30℃) and in the cold storage room