In recent years, personal comfort model has attracted much attention. The temperature of facial skin surface is the key parameter in the model. This paper used high-resolution network (HRNet) to directly detect facial landmark on thermal images to extract facial temperature. Achieve the superior accuracy over the state-of-the-art algorithm. Furthermore, we add face attributes as weights to the loss function to further improve the accuracy of difficult cases (such as profile faces, occlusions, exaggerated expressions). Finally, compare its performance on infrared images and RGB images in different conditions, and prove that infrared images can replace visible light images for accurate landmark detection under some special conditions (such as low light, privacy protection).

With the increase in people’s demand of household food freshness, the single-pattern air supply and temperature/freshness control in the conventional refrigerator no longer meet the requirement of food preservation nowadays. To address the problem of poor preservation quality with non-partitioned storage in conventional refrigerators, this article proposes the concept of temperature-humidity-oxygen-based precise preservation and flexible partitioned storage. The two-factor mathematical model is built for preservation quality and efficient use of compartment space. Besides, the scheme of flexible partitioned storage is also determined according to user survey data and food deterioration experiments. Compared to the conventional refrigerators, that with the new concept enhances food preservation quality by 56%.

The air volume reduction and air recirculation caused by installation platforms affect the operating performance of room air conditioners (RACs). In this paper, the additional temperature difference performance model was proposed in practical applications, which reflects the influence of platforms on energy efficiency of RACs, based on adding a temperature difference to the outdoor temperature. The annual energy consumption of the frequency constant RAC with a triangular bracket platform, a normal louver platform and an optimized louver platform are calculated and analyzed. The results show that the annual energy consumption increased by 6%~10% and 2%~5% respectively when the normal and optimized louver platform are used. Since the louver installation platforms will lead to the extra energy consumption of RACs, the optimization of the geometric structure can alleviate extra energy consumption.

New refrigerator odor will affect the first experience of consumers, and relevant research is becoming more and more important. By smell evaluation method, the phenomenon of high odor level was found in the new refrigerators on the market. According to the gas component analysis, the new refrigerators contained hydrocarbons, benzene, aldehydes and esters, which were mainly derived from EPS foam, plastic parts and adhesive materials. On the basis of the experimental research, the research on the odor improvement of new refrigerator materials and components and the odor removal method of the whole refrigerator also provides theoretical guidance for the following new refrigerator odor improvement.

For the fixed frequency air conditioner, with the gradual increase of ambient temperature, the cooling capacity gradually decreases. In order to solve this problem, based on the technology of increasing Enthalpy by air jet, the specific reasons for increasing the high temperature cooling capacity of the system are obtained through theoretical analysis, and the effects of the key parameters of the system and the aperture of the compressor air supply port on the refrigeration capacity are analyzed and verified in detail. Finally, it is concluded that increasing the liquid level in the flash evaporator can effectively improve the cooling capacity; at the same time, reducing the diameter of the air supply port of the compressor can improve the cooling capacity and reduce the power of the whole machine. Through the implementation of the above scheme, under the same configuration and the same displacement, the refrigeration capacity of the constant frequency jet enthalpy increasing air conditioning system is 10.8% higher than that of the ordinary air conditioning system at 46 ℃.

There are many kinds of abnormal sound pressure in the indoor unit, among which the problem of transmitting sound is one of the difficult problems to solve. The problem of sound transmission can be effectively solved by adding a resistant silencer in the outdoor unit, but the selection of the location of the silencer plays a vital role in solving the problem. According to the structure of different compressors, the root cause of sound transmission and propagation path are analyzed in detail, through theoretical analysis and experimental verification, the solutions of different compressor air conditioners in different models of sound transmission are obtained, which provide reference for the subsequent rapid solution to the sound transmission problem.

The intellectualization of home appliances is the trend of the future. Applications such as clothing material identification and food quality inspection are in strong demand. Spectral analysis is a real-time measurement technology with the advantage of rapid and non-destructive. It has been widely used in agriculture, industry and other fields. In order to study the applications of spectral analysis in smart home appliances. The applications and researches of spectral analysis in home appliances are reviewed. Based on the researches in other fields, this paper analyzes the application process and system architecture of spectral analysis technology in home appliances, and summarizes the typical application scenario. Spectral analysis technology will realize many user-demanding scenarios, and is highly potential.

In order to realize the accurate selection of the sound-absorbing cotton in the refrigerator mechanical room, improve the sound quality of the whole machine of the refrigerator, take four different materials as the research object, through theoretical analysis and transmission loss test, study the effect of different materials and thickness on the sound absorption coefficient of the material, and at the same time, through comparative analysis to clarify the difference siphoning performance of different sound-absorbing materials under the high speed operation of the refrigerator compressor, the results of the study provide a real and effective test case for the refrigerator mechanical room sound-absorbing cotton selection, and provide a valid test case for the refrigerator mechanical sound-absorbing cotton selection.

Beat frequency noise from the air conditioner outdoor unit sounds discontinuous, the sound increases and decreases periodically, which negatively affects the users’ experience. In order to reduce the beat frequency noise, on the basis of spectrum analysis, it is found that the source of the noise is the quadruple frequency of compressor’s electromagnetic excitation and the quadruple frequency of compressor’s rotation work together. Further modal test shows that the natural frequency of reservoir is close to the quadruple frequency of compressor’s electromagnetic excitation, cause the reservoir amplifies the vibration of compressor. Change the connection mode between reservoir and compressor from clamp connection to welding, keep the natural frequency of reservoir away from the quadruple frequency of compressor’s electromagnetic excitation, the noise has been improved greatly.

By comparing the nutrient contents of broccoli and purple potato after cooking, the effects of different cooking methods on food nutrients were studied. The study found that under the best technological conditions of different cooking methods, open flame steamer and microwave have the highest retention of vitamin C and polyphenols in broccoli, followed by electric steam box, stir fry and poaching, the worst is baking; Steamers, electric steamers and microwaves have the highest retention of polyphenols and total anthocyanins in purple sweet potatoes, followed by baking and frying, and the worst is poaching. In summary, the lower temperature electric steamer, open flame steamer cooking method and shorter time microwave cooking method can retain nutrients in food, which provides theoretical basis and practical support for the healthy cooking of household appliances.

Based on the coverage of GB 4824, the information of edition change and the characteristics of the standard, the specific differences of microwave ovens in the new and old standards are analyzed,The changes in testing methods, limits and testing arrangements of microwave ovens are highlighted. Around the changes in the new edition of the standard, preliminary suggestions for the implementation of the standard are put forward for laboratories or manufacturers, thus making technical adjustments to the textile test of microwave ovens.

By analyzing the advantages and disadvantages of the existing intelligent anti pinch control technology for air conditioner sliding switch door, the key factors affecting the anti pinch effect and reliability are found out, and the anti pinch control technical solutions based on hall detection principle is proposed. Combined with theoretical design and experimental test, it is proved that the technical solutions can effectively solve the problem of door jamming or hand clamping in the sliding process, improve the user experience satisfaction and improve the product reliability.

The quality of rice includes nutrients, texture, flavor, taste, etc. By comparing different heating types of rice cookers, the nutrition content, texture, heating process and other aspects of the rice produced at different stalls were studied to analyze different rice cookers the influence of stalls on the quality of rice. The results show that the rice prepared by domestic brand IH rice cooker is similar to the rice prepared by foreign brand IH rice cooker in terms of nutritional components, and the loss of the rice prepared by domestic brand IH rice cooker in the quick-cooking stage is less.

Capillaries are widely used in the shunt flow regulation of indoor and outdoor heat exchangers of split air conditioners and multi-split air conditioning (heat pump) units. Accurate prediction of the pressure drop characteristics of two-phase flow refrigerants in capillary tubes is the key to quickly realize shunt capillary matching of heat exchangers. Propose. a method for calculating the friction resistance factor of two-phase flow in capillary tube under the condition of variable density based on approximate integral is proposed, and the effect of capillary diameter on the friction resistance factor of R410a refrigerant in capillary tube is studied experimentally. The results show that the friction resistance factor of the two-phase flow in the capillary tube decreases with the increase of the refrigerant Re number, which is consistent with the trend predicted by the classical Churchill model, but its value is more than twice that of the Churchill model, and the friction resistance factor f of the two-phase flow in the capillary tube decreases with the decrease of the inner diameter of the capillary tube.

With the rapid rise of e-commerce channels and the gradual deterioration of product storage and transportation environment, the packaging performance of the original products can no longer meet the market demand. This paper analyzes the structure and characteristics of new material EPO. Taking a water heater package as an example, it briefly introduces the design idea and structural optimization scheme of the underlayer of water heater EPO material, and compares the overall cost of the two schemes. Finally, the inevitable trend of EPO materials in the development and promotion of home appliances industry is briefly described.

The wettability test and welding quality test were used to study the effects of inhomogeneity of Cu phase on character and brazing performance of different BCu93P copper based brazing filler metal. The results show that BCu93P brazing filler metal is composed with white Cu phase and dark Cu3P phase. The Cu phase is distributed in graininess or unity. The spreadability and clearance fillabitity of brazing filler metal with granular Cu phase are better than that with united Cu phase. BCu93P has good metallurgical combination with the base metal. The weld zone is composed with α-Cu and mix microstructure of α-Cu and Cu3P. The homogeneity of mix microstructure of weld zone brazed by filler metal with granular Cu phase is better than that with united Cu phase, and the size of α-Cu phase of the former is less than the latter. α-Cu phase is the ‘softer’ phase in the weld zone, the united distribution and large size of which go against the improvement of strength of weld zone.

For the twin tub washing machine, the motion of spinning tub is firstly simplified to two degrees of freedom model, the equation of motion is then established by using D′Alembert principle. The dynamic equation is solved and the amplitude-frequency curves of two degrees of freedom are drawn. Then the influence of attached mass ring height on the spinning tub vibration is studied. At last, the finite element method is used to perform modal analysis and frequency response analysis for spinning tub, the CAE analysis result is to confirm the correlation and feasibility of the established dynamic equation.

Large capacity is an important direction of the development of washing machine. The so-called large capacity washing machine is based on the situation of constant width, constant depth or little change of the whole machine. It mainly improves the capacity of the whole machine by increasing the diameter of the drum and optimizing the design of the parts in the depth direction of the whole machine. Because the width of cabinet is constant and the diameter of drum increases, the gap between the drum with the tub and the gap between the tub with the cabinet will be reduced. In this paper, through the system design and test of the width direction of the whole machine, the capacity of the whole machine is improved in the range of safety clearance.

Environmental protection has become the goal of global sustainable development. Analysis of the application of nano diffusion pipe in the local nitrogen protection welding process of wave soldering, By analyzing the amount of dross generated by nitrogen hydrodynamics, tin furnace structure, and nitrogen concentration, a device was developed to allow nitrogen to reach a certain concentration and maintain equilibrium at a local location. Through simulation software to simulate the distribution of nitrogen and combined with experimental verification, a reasonable range of nitrogen concentration was finally determined, and the purpose of saving solder, improving product quality and reducing cost was successfully achieved.

The main differences between the new edition and the previous one of GB/T 23137-2020 "Heat pump water heater for household and similar application" are discussed. New standard revised terms and definitions, product classification, technical requirements, test methods, inspection rules, marks and other aspects. It mainly refined the requirements of temperature drop value and noise value for hot water storage performance, and increase the requirements and test methods for annual energy consumption efficiency (APF) of air source heat pump water heater.

Personalized customization is a new service mode for mass production of customized products to meet the needs of individual customers on the premise of ensuring the economic benefits of the manufactures. It is an inevitable trend for the development of consumer goods manufacturing industry. Combined with the industry and product characteristics of home appliance manufacturing industry, this paper makes an in-depth analysis of the advantages and concepts of personalized customization, analyzes the cases of "personalized customization" in the market, extracts four typical models, and sorts out the key sections and technologies involved in the process of personalized customization. This paper puts forward the technical problems that should be paid attention to in the household electrical appliances industry, and provides reference for the household electrical appliances enterprises to carry out relevant production and service.