With the rapid development of society, the problems of the increasing energy consumption and the use of excessive energy, directly bring is worsening of environment. The worsened Environment and the lacked energy was given us some serious challenges and pressure in the sustainable development of society. The new type and clean energy become an effective way to meet the challenges and to relieve stress. Without doubt, the solar energy is one of the most promising in the green energy. This paper focuses on a new type of photovoltaic inverter heat pump water heater, and brief analysis of its energy saving effect.

The problems existing in the energy efficiency test of the current household heat pump water heater standard are discussed. The improvement measures of the two methods of drainage method and mixing method are put forward, and the verification of the two testing methods is introduced. At the same time, the influence of thermal storage compensation of thermal storage water tank on the heating capacity of household heat pump water heaters was also discussed. The differences between the initial water temperature and the actual water consumption of existing standards and the solutions were also discussed.

This article discusses the test method of air source heat pump water heater for EU market, by analyzing the Performance test standard BS EN 16147-2011Heat pumps with electrically driven compressors-Testing and requirements for marking of domestic hot water units. Based on the experimental verification and data analysis of heat pump water heater, this article summarizes some schemes of coefficient of performance (COPDHW) improvement of heat pump water heater system.

Based on the CFD simulation software, the calculation process for hot water output rate of electric water heater by CFD numerical simulation, and on top of that, according to different structure, the article expressed the comparison and analysis on different scheme, and finally it determined the related factors affecting output rate of hot water of the electric water heater. It determined new technical improvement directions for improving hot water output rate of electric water heater, which shortened the development cycle synchronously.

Instant hot water gas water heater become more and more popular in market at present, not only stand for the high-tech in the area now and future, but also lead to the direction of the gas water heater area, so many famous manufacture takes a lot of effort to develop this kind of gas instant hot water heater. Some famous brands has put the instant hot water gas water heater as a symbol of their R&D strength, which has been sent in market and got the marketed and recognized by consumers. Now there are two factors need to be solved of this kind of water heat：less product type and high cost. The article describes the design principle and test plan of instant hot water gas water heater, effectively solved the waiting time and water waste problems by add circulating pump, thermostatic water tank, and water pipes system, greatly improved the use of comfort, and provides reference for the intelligent, comfortable and healthy development of gas water heater.

This paper demonstrates a system of R134A refrigerant based on research in the control algorithm to build platform and throttle control the. The algorithm will change with the exhaust temperature timely conversion using superheat control valve and exhaust valve control system, to solve the problem and reduce the regulation is not flat coil temperature inside the compressor exhaust temperature caused by the high high insulation reduced compressor oil carbonization risk.

Aiming at the 60L electric water heater, effects of different water quality and different temperature conductivity conditions by using electrochemical method, using water tank electronic magnesium anode, anode protection corrosion potential, corrosion rate and hydrogen evolution and the concentration of magnesium anode, corrosion protection effect of the electronic Yang compares. The experimental results show that the water potential of electronic anode protection after all in the effective scope of protection, and the potential value is relatively concentrated, and magnesium anode protection have certain protection and self loss phenomenon; protective effect of using magnesium anode and electronic anode corrosion protection significantly, corrosion rate of protection than the protection before the decline more than 10 times, the whole electronic anode is better than magnesium anode; magnesium anode in cathodic protection of the precipitated water tank of hydrogen anode protection than the electron precipitation amount of hydrogen, hydrogen in the same cavity volume in high concentration.

In this paper, we take the advantages and disadvantages of the conventional flat solar collector as the breakthrough point, on a flat plate solar collector of all plastic scheme is analyzed, from the structure, material selection, performance, analysis of several aspects, such as service life of the collector of all plastic are analyzed, and the collector of all plastic is obtained with the advantages of enough, must be in the field of solar products in the future a major research direction.

The composition and operation principle of direct expansion variable frequency solar heat pump hot water system are introduced. The fixed frequency method is used to analyze the operation rules and characteristics of solar water heater. The system performance is raised on the basis of ensuring the user 's demand for heating water. According to the difference between the actual heating capacity and the expected heating capacity, the operating frequency of the inverter compressor is adjusted to realize the heating time and the heating efficiency of the control system. The feasibility of the method is verified by data analysis and experimental verification.

Propane substituting for R22/R134a has a good future for protecting environment and saving energy. This paper designed and developed a new integral floor heat pump water heater with propane, analyzing from the propaneecharacteristics, system matching, several aspects of safety design, think that propane is a good alternative refrigerant with great advantage, it is the most potential refrigerant of environmental protection in small heat pump, with flammable explosive proposed to pay attention to the design, production and use of process problems.

Because of the complexity of the residents' living condition in our country, many areas, especially in rural or urban old residential areas, there will be pressure on the low side, to the normal gas water heater can't start, hampering the promotion and application of gas water heater. Or the water heater can start, but the water is too small to affect the user's comfort level. So adding a booster pump on the gas water heater will be a good solution to this problem. Many water heaters are eager to try. But increasing the pressure pump causes noise. This paper mainly deals with the noise reduction of the whole machine due to increased pressure pump by means of different noise reduction. By using the solution of the situation of using gas water heater, this paper combined with the actual test results contrast analysis, it is concluded that the scheme for improving the existing water heater burning gas brings the problems such as noise to expand by increasing booster pump to improve has significant and far-reaching significance

Aiming at the widely used control scheme of inverter compressor, the loss components of power devices are analyzed and simulated. Based on the simulation results, the super-junction power MOSFET is proposed to be applied to inverter. The simulation and measured results both show that Cool-Tech^TM inverter technology based on super-junction power MOSFET can significantly reduce the heat loss of the inverter and improve the COP value of the inverter refrigerator products.

This paper studies the reason of Surge test fail caused by the improper layout of PCB,proposes a method to improve the performance of variable frequency circuit to resist Surge interference and solve the problem by adjusting the ground trace and decoupling capacitance of PCB of variable frequency circuit。

Infrared transmitting materials exhibit excellent Infrared transmitting properties, which could be used for home appliance appearance. The infrared transmitting materials could also satisfy the need for mechanical intensity and appearance. ABS or HIPS can be replaced by infrared transmitting materials in the field of home appliance appearance.

Tropical fruits are rich in nutrients, grow in high temperature and humidity environment. Under high temperature and low humidity condition, the respiration of picked Tropical fruits are stronger. Under low temperature and high humidity condition, cold damage is easy to happen, so it is difficult to storage. The experiment research variety of mangoes nutrients by controlling temperature and humidity, finally confirm the best storage of temperature and humidity is 10℃, 95%.

This paper starts from the multi-body dynamics analysis of drum washing machine to calculate the critical speed, and compares with the natural frequency of subwasher which does not consider the gyroscope effect, drawing the conclusion: After considering the gyroscope effect, the critical speed of drum washing machine will be decreased, and based on the safety design, the gyroscope effect should be considered in the critical speed analysis of subwasher, and thus this paper provides a method for this analysis.

This article analyzes the definition of detachable/non-detachable parts in GB 4706.1-2005 "Safety of Household and Similar Electrical Appliances Part 1: General Requirements", Combination with relevant technical articles and CTL decision, It give objective conclusions to several difficulties during the understanding of detachable/non-detachable parts. It provides a reference for actual tests.

Flash, The term"the quality of the plastic industry", A useless part of a product's edge. Because the extra part usually has a front, So it's called a cape . The flash is usually produced in the mold parting surface, insert, slider position. Due to material fluidity, defect of mold structure, unreasonable product design, improper molding process. At present, the use of plastic products in all industries more and more. Many product structure designs have been replaced by plastic. Adapt to the needs of the era of light-quantification. For example: automobile products, home appliance, electronic products, etc. However, plastic products are easy to cause flash in the process of mold forming. This is a fatal quality defect for product quality. This paper takes home appliance air conditioning panel as an example. Study on the cause of plastic products in flash. The corresponding improvement plan has been developed. It's not only meet customers' requirements towards appearance and update product grade, but also make a breakthrough for such pain point of the mold. In this paper, the paper expounds and introduces the process parameter improvement of plastic products. The influence of the reader on molding process in mold forming is recognized.

In this paper, the variation coefficient was introduced to quantify the uniformity of temperature distribution in the cooking process of IH rice cooker. The influence of the distribution position of the excitation coil on the temperature distribution is studied. The results show that the variation coefficient of temperature in the pot increases with time and decreases with the overall trend, and the maximum is 0.18 in the middle of the heating stage, which is the lowest temperature uniformity in this phase. The coefficient of variation is related to the position of the excitation coil. The coefficient of variation is at a lower value as a whole when d = 30 mm at the bottom of the coil in this experiment. Namely, the temperature distribution is relatively uniform of the whole cooking process under such conditions in the pot.