Physical fatigue caused by sleep deprivation not only reduces attention, work efficiency and social productivity, but also greatly increases the risk of human errors and accidents. And it can be difficult to recover from fatigue if sleep deprivation persists. To prevent the accumulation of fatigue caused by sleep deprivation, it is important to ensure the sleep time required every day. For better sleep, not just comfortable bedding and a relaxed body, the sleeping environment is also extremely important. This system is to adjust the temperature, humidity, light and sound before bedtime, bedtime, and wake-up through smart homes such as air conditioners, lighting and audio to help users achieve rapid sleep, comfortable sleep, and be able to get up in full spirits.

This paper studies the real-time recommendation of air conditioning operation based on behavior similarity, and proposes an optimized KNN algorithm Fo-KNN algorithm, which divides user features into different feature groups, and deeply studies the influence of each feature group on air conditioning operation, thus providing users with more accurate air conditioning operation recommended service. It can be seen from the experimental results that compared with the classical recommendation algorithm, the method has a great improvement in accuracy.

The commercial heat pump module produces time serialized data during operation, conventional equipment monitoring scheme adopts local configuration software to store and monitor the host running data. Data storage is scattered, which is not conducive to the overall analysis and use of data. This research uploaded data to the cloud through IMU and displayed the data through WEB. At the same time, auxiliary correlation analysis helps operators or users to monitor equipment state and equipment manufacturer to analyze equipment running state. It is of great significance for energy saving, project operation and maintenance and improvement of unit quality.

This article focuses on the detection method of oil-soaked filter screen oil fouling, and the intelligent oil reminder and intelligent cleaning service system. By installing a pressure sensor in the hood and detecting the change of the full pressure and dynamic pressure of the hood through the pressure sensor, the relationship between the static pressure change law and the plugging of the hood filter is verified, and a corresponding program algorithm is designed to achieve the Intelligent oil reminds and feedbacks the filter plug-in condition to the after-sales terminal system through the smart device, and then realizes the interaction scene between the after-sales staff and the consumer, and improves the viscosity and product reputation with the consumers.

The long-term stability of VOCs gas sensor greatly restrains its application in household appliances. Improving and enhancing the working stability of VOCs sensitive material is the key to solve the sensor failure and the poor long-term stability of VOCs gas sensors. In this work, the experimental scene tests and long-term stability experiments of VOCs gas sensor based on VOCs sensitive material slurry formula are carried out. The results showed that the designed and optimized slurry formula can effectively reduce the working temperature of the sensor, improving its resistance to the changes and toxicity in external environment, and enhancing the gas sensitivity and long-term stability of the VOCs gas sensor. This work has reference value for the fabrication and design of VOCs gas sensors with the excellent long-term stability.

Intelligent electrical storage water heaters as a development direction of enterprise, which are liked by more and more people and have a certain market share. How to evaluate the intelligence of a water heater, detailed evaluation method is given in the standard of T/CAS 286-2017. This paper introduces the important intelligent function, test method and evaluation method in the standard.

The common equipment to regulate the indoor environment temperature, its single temperature regulation function can’t meet the needs of people. In this paper, the air conditioner, the audio air conditioner with the air conditioner through the remote control, select the track to play. The spectrum of vocal music is based on the feeling of the person, whose body temperature changes with the change and produces light, medium, stress, mild, intense and so on.

NB-IoT is an IoT communication technology based on 3G/4G evolution of cellular communication. It works in a dedicated licensed frequency band. mainly used for low-throughput and massive connection scenarios and will undertake a large number of IoT access services in the future. Therefore, NB-IoT will be one of the main communication technologies for intelligent transformation and upgrading of white household appliances. Using the characteristics of wide-area coverage, it is possible to track home appliance location in the warehouse's inbound and outbound management, pre-sale logistics and user area distribution statistics by equipping with battery power supply, and to carry out more efficient and convenient supply chain management. Due to the convenient access of NB-IoT and the high network access rate, users can make maximum use of their home appliance usage data and fault data to achieve targeted sub-regional customized development and marketing activities.

Smart home appliances are not a single smart product, they need to interconnect with other home appliances and home facilities to build a complete smart home system. Safety, stability and reliability have an important impact on smart home systems during operation. This paper presents a test system for the reliability of smart home appliances. The software based on test terminals was implemented and the experimental methods were given. Samples from different manufacturers were participated in the experiment. The author analyzed the experimental records. The results provide reference for later research.

With the arrival of the third consumption structure upgrade in our country, people's consumption concept has been upgraded from the pursuit of functional consumption to the pursuit of quality consumption, and the washing machine industry has also transitioned from popularity to upgrading. Convenient technical innovation based on users' quality consumption demand has become the leading indicator of market development. Based on multiple dimensions, this paper comprehensively analyzes the new technologies and structures of washing machine in terms of use convenience, as well as the convenience experience they bring to users, and puts forward the prospect of development directions of convenient operation.

This paper mainly focuses on Renesas' capacitive touch detection technology research, including the basic principles of touch-key detection and the noise immunity technology. The section of touch-key detection principles introduces the capacitance value - current conversion theory, the current digitalization and the touch-key ON/OFF determination. The section of noise immunity technology introduces the phase shifting technology and the spread spectrum technology implemented by hardware, as well as the software drift correction technology and the software smoothing technology.

New UL require that the mechanical timer need add another operation to go to stay on position when consumer operated the oven. Timer principle limit cannot be changed, need to redesign the knob and timer to match the panel. In this paper, to meet the new safety requirements, we introduce the way to limit the elasticity of the block and knob on the panel.

According to the situation that, the safety and quality problems of the thermal-storage hand warmer products are serious, and service life is generally low currently. According to the principle of service life safety inspection, our project research team recycles old samples from users, purchases new samples from the circulation field, and fault detection and safety inspection for the thermal-storage hand warmer products were carried out, the safety design defects and quality problems existing in the product were found. We put forward suggestions for improve measurement and design about Nameplate, Input power current measurement, Structure etc. which will make the service life of the hand warmer products longer and good for safe use.

To solve the problem that the height of the lower baskets in the double-layer household sterilizer currently on the market has a large gap, this paper proposes a lifting mechanism that can save labor, so that the user can pull out the basket and raise the distance when using the lower basket, reduce the height difference between the upper and lower baskets. The mechanism proposed in this paper can make it self-locking at a high position after it is lifted and lifted to ensure the safe use of the user.

During the operation of the air conditioner compressor the vibration generated by the rotation of the compressor rotor system through the pipeline to the structural member, causing vibration and noise of the air conditioning structure. In this article, Dynamic analysis of compressor rotor system by finite element method, using elasticity finite element method to establish the Dynamic equations of compressor rotor system; based on the finite element method with few degrees of freedom to establish the Dynamic model of compressor rotor system, analysis of the compressor rotor system inherent characteristics using New-mark numerical integration method and ANSYS software, the finite element analysis solution and the numerical analysis solution control the numerical error of the first three critical speeds within 5%, thus verifying the correctness of the established compressor rotor system dynamics model. The unbalance response of the compressor rotor system under different eccentric states is analyzed by New-mark numerical integration method. The analysis results show that the eccentricity and the response amplitude are linear in the rotor system.

In the performance testing of quick freezing refrigerator, the empty load cooling rate test and the full load cooling rate test were respectively carried out. Find out the fastest temperature drop time of the quick freezing refrigerator empty load and the fastest temperature drop time of the quick freeze refrigerator full load. At the same time, the overall performance of the quick freezing refrigerator is investigated, which provides the basis for the optimization and performance improvement of quick freezing refrigerator.

In this paper, by analyzing the two air conditioning apparatus of u-shaped tube processing technology combined with abnormal defects appeared in the actual production, puts forward the corresponding prevention measures and solutions, for air conditioning enterprise actual production has a certain guiding role

In order to analysis the water leakage problems of the wall type air conditioner, several different drainage tubes were analyzed by ANSYS WorkBench structure ststic analysis and Fluent analysis to compare of several different drainage tubes, so as to select the optimal structure of the drainage pipe reducing the probability of the occurrence of water leakage from the customer, to avoid the phenomenon of the custonmers’complaints.