1 increase the thickness of the insulation layer Increasing the thickness of the insulation layer is the most direct and effective way to save energy. For the refrigerator with cyclopentane as the foaming agent, the heat insulation effect increases with the increase of the thickness of the foam layer, and the maximum can be increased to 120m. At the same time, the thickness of the insulation layer in the cabinet should be distributed reasonably, according to the temperature difference between the inside and the outside. And the size of the heat dissipation area determines the relative thickness of the foam layer throughout the refrigerator. Of course, an increase in the thickness of the foamed layer results in an increase in the direct material cost and a sharp drop in the effective volume of the casing of the same outer dimensions. Taking a freezer with a cabinet size of 595 595 1750 and COP=1 as an example, the energy consumption is reduced from the European E to the European B by only increasing the thickness of the insulation layer, and the net volume is reduced by 30%. Then change it from B to A, and then reduce it by 40%. The overall energy efficiency, cost and effective volume are optimized, and the thickness of each insulation layer of the energy-saving refrigerator is as follows. Practice has proved that thickening the insulation layer and making a reasonable match can achieve a good energy saving effect. 2 use high efficiency compressor The efficiency of the compressor plays an important role in the energy saving of the refrigerator. The development of any energy-efficient refrigerator is inseparable from the use of high-efficiency compressors. According to the COP value of the compressor, the current high-efficiency compressors can be divided into three categories: one is a general high-efficiency compressor with a COP value of 1 20 to 1 35; the second is a COP of 1 48 to 1 51; the third category is COP. It is a special high efficiency compressor from 1 78 to 18. Let's take a BCD223 refrigerator as an example to illustrate the relationship between the COP value of the compressor and the energy consumption of the refrigerator. Among them, the first and second types of high-efficiency compressors are mainly improved by traditional mechanical techniques, such as improved valve system and cylinder design, improved bearing lubrication and improved motor efficiency. The third class of high-efficiency compressors with a COP value of 1 78 to 180 is the latest revolutionary result of high-efficiency compressor technology, namely RSD/VSD (variable speed or variable speed) compressors. As shown, we use the BCD223RSD refrigerator developed by RSD compressor, which consumes as low as 0 49kw h/day. In theory, R600a is a refrigerant compressor with higher refrigeration efficiency than R134a compressor, and can save 5% energy. However, due to the large difference in the characteristics of these two refrigerants, the corresponding production process and equipment are also very The big difference is that the choice of refrigerant depends entirely on the CFC replacement road determined by each manufacturer's own conditions, and should not be affected by the goal of energy conservation. 3 energy-saving design of the refrigeration circuit 3 1 evaporator and condenser design according to the principle of thermodynamic cycle of the refrigerator, in the case of maintaining a certain internal temperature of the refrigerator (such as 5 degrees in the refrigerator, minus 18 degrees in the freezer), reducing the temperature difference between the evaporator and the environment inside the box, Increase the circulation refrigeration capacity and system refrigeration coefficient; when the ambient temperature outside the tank is constant (such as 25 degrees), reduce the heat exchange temperature difference between the condenser and the environment outside the tank, which is beneficial to reduce the system energy consumption and thus increase the refrigeration coefficient of the system. For the direct-cooling type refrigerator, the double-evaporator system is adopted to reasonably adjust the refrigerating and freezing evaporation area, too large or too small, which will bring about an increase in energy consumption, which must be controlled at the most advantageous; at the same time, according to the natural convection in the box, the evaporation is arranged. The position of the device and the flow direction of the refrigerant are reverse flow heat exchange to improve heat exchange efficiency. Through the optimized design of the evaporator system, it can save 5% to 8%. Reasonably increase the condensation area, reduce the exhaust pressure, increase the degree of deep cooling, and achieve energy-saving effect. At the same time, the flow direction of the refrigerant should also be considered to make it countercurrent to the natural convection air to increase the effect. Comprehensive energy-saving design of the condenser can save 5% energy in the refrigerator. 3 2 Anti-condensation tube design In the system loop design, the arrangement and direction of the anti-condensation tube also have an impact on the energy consumption of the system. At present, the anti-condensation tube is usually connected to the compressor exhaust pipe, and the superheated steam is used to heat the casing door frame through the anti-condensation pipe to avoid condensation of the door frame. Due to the high temperature of the superheated steam, the heat exchange temperature difference is large, which exacerbates the door seal leakage. In the energy-saving design of the refrigerator, change the position of the anti-condensation tube in the circuit, and use the supercooled liquid in the condenser to properly warm the door frame; at the same time, make the anti-condensation tube as far as possible away from the inner cavity of the box, which can reduce the inside of the box. Leakage of heat. Through the energy-saving design of the anti-condensation tube, the refrigerator can save about 3%. 3 3 Energy-saving matching of refrigeration system From the perspective of thermodynamics, too low (unnecessary) temperature inside the box has an adverse effect on the energy consumption of the refrigerator, on the one hand, the temperature difference of leakage heat is increased; on the other hand, due to the lower demand The evaporation temperature reduces the cycle efficiency of the refrigeration system; more directly, because the temperature of a certain compartment is too low, the compressor startup time is extended, which brings additional and unnecessary energy consumption. In the development of energy-efficient refrigerators, the thermal load matching relationship of the freezer/refrigerator is determined strictly according to the conditions of use (climate type). In the product design and prototype test, the relevant parameters of the system loop are repeatedly adjusted to achieve a perfect energy-saving matching relationship between the refrigerating/freezing chambers. It is the key state point of the system to be controlled during the adjustment process and the corresponding adjustment measures. When designing a refrigerator system, the cooperation of the working time factor is very important. When the compressor is selected, the maximum heat load requirement of the refrigerator can be met, and the working coefficient of the normal operation can be appropriately increased, thereby effectively improving the system operation efficiency and reducing the energy consumption. If the compressor working time is too short, it will bring about an increase in energy consumption because of the large starting power. If the working time is too long, the compressor will always work at the lowest evaporating temperature. In this case, the compressor will work at the lowest efficiency and the energy consumption will increase. Each system has a most suitable working time period, during which the cooling of the refrigerator is the most energy efficient. After many trials, a reasonable start/stop time can save 4% to 6%. The design of ambient temperature and freezer temperature has a direct impact on the energy consumption of the refrigerator. The best match of the refrigerator refrigeration system is determined by the matching relationship between the refrigeration/freezing heat load at a specific ambient temperature. Changing the temperature environment will also change the matching relationship of the load, so that the system can not operate under the optimal state, which will bring disadvantages to the operating efficiency of the system; too low (unnecessary) freezer compartment temperature design will undoubtedly increase the energy consumption of the refrigerator. rise. At present, in some refrigerator designs, due to the blind pursuit of some unnecessary functions, the energy saving of the refrigerator is disadvantageous. For example: wide climate type design. Due to the lack of specificity of the matching of the system, the design of the mask to the face actually fails to ensure that the system operates in a good state, which affects energy saving. Therefore, you should not want to design a refrigerator for all climate types. Oversized freezer. The volume of the freezer compartment tends to grow in a larger and larger direction, and exceeds the freezer compartment required for actual use. Even when it is vacant, it increases the leakage of the refrigerator and increases the energy consumption. Deep freezing function. In order to achieve deep freezing, a lower evaporation temperature is inevitable, thereby reducing the cycle efficiency of the system, increasing the temperature difference of the leakage heat, and increasing the energy consumption of the refrigerator. Fast freezing ability. The ability to quickly freeze is undoubtedly good, but over-emphasis on rapid freezing during design will inevitably lead to larger compressors, which will reduce the working factor and will not be conducive to energy saving in refrigerators. Structural optimization design of 4-door seal and minimization of door box fit clearance The design of the door seal should avoid the contact of cold air with metal accessories, increase the number of air bag chambers, reduce the thickness of the door seals, and use the hidden door seal structure design to reduce the distribution of cold air to reduce the leakage. At the same time, when designing the cooperation between the door body and the box body, there is a slender gap between the two under the condition of ensuring non-interference, and the cold air is locked to the utmost. Through reasonable design, energy saving can be 3%. 5 examples of super energy-efficient refrigerators We have developed a new generation of super energy-saving refrigerators by comprehensively utilizing technologies such as thickening insulation, using high-efficiency compressors, special high-efficiency compressors (RSD compressors), and efficient energy-saving design of refrigeration circuits. As can be seen from the above table, the measured energy-saving effect of all types of refrigerators is superior to the European-level household refrigerator A-level energy-saving standards, and of course far superior to the Chinese household refrigerators A-level energy-saving standards. In the current energy-saving field of refrigerators, the highest level of energy-saving has been achieved. Plastic Seal,High Security Seal,Security Seal Polyurethane Parts,Rubber Sleeve Co., Ltd. , http://www.topstar-seals.com