In the 50W horizontal flame test, the wire gauze is a test consumable. It not only plays a supporting role for the sample residues which lose self-supporting ability due to combustion in the test process, but also can greatly stabilize the combustion state of the sample and improve the reliability of the test method. At present, there are many kinds of wire gauze on the market, such as wire diameter, mesh number, weaving method, material and so on. So how to choose these different wire gauze? In this paper, we will use the reference material of horizontal flame to carry out some comparative analysis tests on the wire gauze. The results show that the reference material of wire gauze developed by our institute can effectively help the laboratory to improve the consistency of the results.

The refrigerator test packages have been used in China for more than 30 years. However, for the reason that it has yet been popularized on large scales and both the amount of its manufactures and users are limited, certain quality problems long existed in test packages have not been recognized and rectified during the past years. This paper analyzes some existing quality problems in test packages and their impacts on effectiveness, moreover, the quality improvement scheme of the test package will also be studied.

By evaluating and analyzing the uncertainty of the measurement of cooling capacity by air enthalpy method, the key influencing factors in the test process can be identified and the reliability of the test results can be determined. It can be seen from the analysis that the uncertainty component introduced by inlet and outlet wet-bulb temperature has the greatest influence on the results. It is very important to improve the precision of wet-bulb temperature measuring element and ensure the stability and reliability of wet-bulb temperature sampling.

Test installation of washing rate is one of the important equipment for evaluating washing ability of washing machine. In this paper, the calibrating process of testing equipment is analyzed with evaluating uncertainty of washing rate, and the importance of calibrating reference washing machine is introduced.

The long-term performance of air-conditioners will decrease after long-term operation due to the coverage of particulate fouling in heat exchangers. The purpose of the present study is to summarize the recent research on long-term performance of air-conditioners and heat exchangers. The introduction to the influence of dust particles on the performance degradation of heat exchanger covers the effect of dry dust particles and the effect of wet dust particles on the air-side heat transfer and pressure drop. The research on the long-term performance evaluation covers the evaluation standard and the testing method of long-term performance degradation. The research of prediction method on the particle deposition on heat exchanger includes the dry particle deposition model and the wet particle deposition model. The dust removal techniques of heat exchangers and their application fields are also introduced.

During the operation of the compressor, part of the heat is lost through the casing through convection and conduction in the surrounding environment. This part of the heat can be used to defrost air-cooled refrigerators and heat pump evaporators; refrigerator food thaw; heat pump unit for enhanced heating, etc. When the refrigeration system is operating, a large amount of condensation heat is discharged into the environment, causing waste of energy, increasing the ambient temperature, and reusing the condensation heat can not only reduce environmental heat pollution, but also an energy-saving method that turns waste into treasure. The use of condensation heat mainly includes defrosting of air-cooled refrigerators and heat pump devices; heating of domestic water and production of hot water, etc. The waste heat utilization of refrigerators and heat pump systems is an energy technology research, and the energy-saving benefits can be effectively realized on the basis of rational use of energy.

The heat leakage through gasket accounts for 15% of the total heat leakage of refrigerator. Its sealing and thermal insulation properties have a large influence on refrigeration effect and energy consumption of a refrigerator. Development trend, heat and mass transfer, material formulation and structure optimization are discussed in this paper, which is expected to provide guideline for researchers in the field of gasket. According to the literatures, the CFD technology and Reverse Heat Loss Method (RHLM) are often used to evaluate heat leakage of gasket, while mass transfer load mostly adopt tracer gas technology and collection of condensate. Material formulation is the key factor to determine the migration resistance and mechanical properties. In order to improve the sealing and thermal insulation properties, gasket is gradually optimized from a straight structure to a complex multi-edges and multi-air cells structure adapted to the characteristics of different application.

Constant frequency air-conditioners usually vibrate violently on shutdown, leading to excess pipe stress. In this paper, modal analysis is conducted on pipe system in air-conditioner by experiment and simulation. Natural frequency and modal shape are obtained. Structure of pipe system is optimized in order that the natural frequency of pipe system is far different from the natural frequency of the compressor. The results show that the solution reduces pipe stress on shutdown and improves the quality of the product.

This paper used the electrostatic field combind with controlled freezing storage technology to preserve the pork,and examined the effects of electrostatic field on quality of pork. Some quality index changes were compared in drip loss and TVB-N. The results showed that the drip loss rate remained at a low level by electrostatic field combind with controlled freezing storage technology. And TVB-N value was slowed down to some degrees. In general, the electrostatic field combind with controlled freezing storage technology has a better preservation effect, which can extend the shelf life of the pork.

In order to study the power frequency and high frequency components of the total leakage current generated by refrigerator with inverter in the weight of GFCI (Grounding Fault Circuit Interrupter) tripping current, the calculation method of the total effective leakage current of GFCI tripping is systematically studied. The calculation method is mainly as follows: Measure the total leakage current of refrigerator and decompose it with FFT into various spectral components at power frequency and high frequency ;Measure the tripping level of GFCI tripped by high frequency harmonic leakage current;Convert high frequency leakage current into effective leakage current of power frequency;Calculate the total effective leakage current including all spectrum components at power frequency and high frequency. Finally, the feasibility of calculation method of the total effective leakage current is verified.

In the new energy efficiency national standard of room air conditioner, APF index will be used to evaluate the energy efficiency of single speed air conditioner. Degradation coefficient CD is a critical parameter to calculate APF, so it is necessary to study it deeply. This paper introduces the determination method of CD, through relevant experimental research, the method of optimizing CD is discussed. Suggestions are put forward to improve the test accuracy of CD, which will help enterprises to develop efficient single speed air conditioner.

Gasket is an important connection structure between refrigerator door and body,and heat transfer through gasket is an important component of refrigerator thermal load. In this paper, both CFD simulations and experimental test were carried out to analyze the heat transfer characteristics of frost-free refrigerator cabinet gasket. This paper primarily focuses on heat transfer paths and the proportions which lays the foundation for the optimal design of frost-free refrigerator cabinet gasket. The results show that the heat transfer and leakage of the door seal need to consider the leakage heat of the door seal mass transfer and the heat loss and heat leakage of the door seal. The frost-free refrigerator gasket mass transfer leakage is affected by the pressure difference in the refrigerator. The frost-free refrigerator cabinet gasket mass transfer leakage accounted for more than 36% of the total leak, the pressure difference between the inside and outside of the cabinet is an important factor affecting the leakage of the door seal.

Enthalpy augmentation system can effectively improve the heat production of air source heat pump, so that the use effect of heat pump is greatly improved. This paper theoretically analyses the heating advantages of air source heat pump hot air fan system with supplementary air enthalpy technology over ordinary air conditioning system. By comparing the experimental results of supplementary air enthalpy system and ordinary air conditioning under different conditions of refrigeration and heating, the advantages of supplementary air enthalpy system in heating, refrigeration and comfort of use are obtained, which will promote and use supplementary air enthalpy air conditioning system. Provide technical support. At the same time, the operating range and conditions of gas-supplement enthalpy-increasing are studied, which can play a positive guiding role in optimizing the use of gas-supplement enthalpy-increasing technology, and also play a positive guiding role in the design of gas-supplement enthalpy-increasing heating system.

This paper mainly studies the characteristics of R32 refrigerant and its performance analysis on window wall air conditioner. R32 is environmental refrigerant with good thermal performance and high latent calorific value. Compared with R22 and R410A, R32 has lower perfusion volume, better safety performance than R290. At the same time, its ODP=0 has no damage to the ozone layer, GWP is 675, carbon emissions are relatively low, and environmental protection. Compared with R410A, the perfusion volume of R32 decreased by about 27% and the capacity and energy efficiency increased by 4%.

By comparing the advantages and disadvantages of R290 with R134a and R404A refrigerants, it is analyzed that R290 refrigerant is the most promising environmentally friendly refrigerant. This paper analyzes the causes of failures such as compressor start-up and stuck in R290 refrigeration compressors, proposes targeted solutions, and carries out prototype research and development. The results show that the application of these technical measures has a good influence effect. The reliability of the compressor is greatly improved.

In the GB/T 18801-2015 standard, for particle CADR test, it is recommended to use cigarette smoke particle from the Hongtashan Classic 150. In this study, in order to compare the effect of the smoke particles from different brands of cigarettes on the particle CADR test, three brands of cigarettes (the Hongtashan Classic 150 cigarette, Century Hongtashan cigarette and Japan SevenStars cigarette) were chosen for the particle CADR test using three air cleaners, respectively. It was found that the deviation of the test results of these three brands of cigarettes is small, less than 3%, indicating clearly that Hongtashan Classic 150 can be replaced by Century Hongtashan and Japan SevenStars for particle CADR test.

After “General requirements for the competence of testing and calibration laboratories” has been revised, the requirements for the evaluation of measurement uncertainty in testing laboratories will be more precise. This paper discusses how to use the evaluation of measurement uncertainty in dimensions tests, and introduces the preliminary method of measurement uncertainty, so as to provide reference for the engineers who are just entering the testing industry.

This paper is based on the analysis of calibration methods and results of environmental temperature field in the performance testing chamber of household and similar refrigerating appliances. The performance testing chamber of household refrigerating appliances (hereinafter referred to as " testing chamber ") can simulate different climate types, and is an important device for testing and researching household and similar refrigerating appliances. The testing chamber is composed of computer control system, measuring instruments, sensors and data acquisition devices. It is mainly used to test the temperature, power consumption and energy efficiency of refrigerating appliances.This paper describes in detail the calibration method of the environmental temperature field in the testing chamber and the calculation process of the calibration results. It is hoped that it will be helpful to the experimenters and better serve the enterprises and testing laboratories to ensure the accuracy and consistency of the performance testing of refrigerating appliances.

In this paper, by studying the effects of electromagnetic induction rice cooker preparation, load conditions and operating conditions on the results of disturbance voltage, by pre-heating, load water temperature and monitoring power requirements of electromagnetic induction rice cooker test, the consistency, reproducibility and a test method that captures the worst state of disturbance voltage is obtained.

During the development of a certain type of refrigerator, the deformation problem of the bottom beam of the package drop test has been unable to be effectively solved. By simulating the drop technology and simulating the test process, it is found that the structure strength and packaging structure of the bare refrigerator are a pair of contradictions. The bottom beam of this refrigerator has long span and poor impact resistance. It is difficult to solve the deformation problem of the bottom beam simply by optimizing the packaging structure. By optimizing the bottom beam and packaging structure, the plastic deformation of the bottom beam is reduced from 0.7% to 0.13% the reduction rate is 78.6% which is 0.4% lower than the reference equivalent plastic strain. The deformation problem of the bottom beam of this type of refrigerator is effectively solved.

The choke structure of the door is a key component to prevent microwave leakage from the gap between the oven cavity and the door. In this paper, a simplified model for simulation calculation of choke structure of 5.8 GHz frequency microwave oven door is presented. By using CST electromagnetic simulation software, the structure parameters of choke fins affecting the shielding effect of microwave leakage are calculated by parameter-sweep. The key dimensions of choke fins are determined quickly. Basing on this, the final structure with S-parameter S21 is further optimized up to -86dB. The test of 5.8GHz microwave oven shows that the door with the designed choke fins has a good shielding effect, which solves the microwave leakage safety problem of 5.8GHz microwave oven.

Based on Robam S226 and C906, this study carried out research on the precise control technology of cavity temperature and steam volume through external steam generator and peristaltic pump. It has been found that it is difficult to achieve superheated steam by steam generator alone in S226 and C906. The shortest preheating parameters of superheated steam reaching 105℃ is steam generator setting temperature 175~200℃, steam flow rate 26.4~31.7mL/min, and the preheating time is between 7~8min. At the same time, the initial temperature of the steam generator, the number of air outlets of the cavity, and the temperature of the inlet water have little effect on the preheating time. More importantly, under the condition that the steam generator provides steam of 100℃, the steam flow is in the range of 34.4~47.8mL/min, and the C906 cavity uses auxiliary heating by setting temperature between 110~150℃, the superheated steam and separate precision control of steam volume can be realized, which provides application and technical guidance for embedded products to achieve separate and precise control of cavity temperature and steam volume.