Heat pump water heater compressor standard will be released

The heat pump water heater industry in China has developed rapidly in recent years. The products have the characteristics of energy saving and environmental protection. However, there are still some chaos at the same time as the rapid development of the industry. The quality of the compressors used by the company is uneven, and the reliability and lifespan of the products are also different. In order to regulate the industry and promote the development of the industry, the "completely enclosed motor-compressor for household and similar heat pump water heaters" (hereinafter referred to as "heat pump water heater compressor") drafted in November 2009 has now entered the approval stage and will be released soon. Implementation. The reporter was informed that the implementation of the standard will play a positive guiding role for the heat pump water heater companies choose compressors.

Detailed product and condition classification It is understood that “Heat Pump Water Heater Compressor” is a standard project formally established by the National Standardization Administration Committee (Project No.-T-607), managed by the National Household Electrical Appliances Standardization Technical Committee, and standardized by the national household appliances. The technical committee of household appliances was drafted by the Subcommittee on Main Components. Xi'an Qing'an Refrigeration Equipment Co., Ltd. is the unit leader of the drafting working group. The working group for the drafting of this standard was established and carried out its work in November 2009. It organized four seminars. The standard has now been drafted.

The responsible person of the National Household Electrical Appliance Standardization Technical Committee's main parts and components sub-committee of home appliances introduced that the standard takes the technical requirements and test methods of the heat pump water heater compressor as the main content. During the formulation process, a large number of tests are used to determine the compressor refrigeration. Test conditions, accelerated life test conditions, and performance index specifications.

It is reported that heat pump water heaters are different from air conditioners and need to be used throughout the year. In order to reflect the operating characteristics of the compressor in different seasons, the standard sets different working conditions for different seasonality in the cooling capacity test. At the same time, the evaluation of the heat pump water heater compressor also adopts standard operating conditions, summer conditions, and winter conditions. Test conditions. In addition, the parameters of the test conditions in the standard are determined based on the actual operating parameters of the heat pump water heater in different seasons. For example, in the cooling capacity test conditions, the condensing temperature is (60±0.3)°C in both the standard operating conditions and the summer operating conditions. The condensing temperature under working conditions is (55 ± 0.3) °C. The evaporation temperature under standard conditions, summer conditions, and winter conditions is (10±0.2)°C, (15±0.2)°C, (0±0.2)°C, and the suction temperature is (20±0.2)°C, respectively. (25±0.2)°C, (10±0.2)°C.

The performance coefficient index of "heat pump water heater compressor" is determined according to the actual level of molded products and R&D products of each domestic compressor manufacturer. The relevant R&D personnel of Xi'an Qing'an Refrigeration Equipment Co., Ltd. said: “According to different types of compressors and refrigerants, the standard sets the product performance coefficient, and divides the compressor into a rotor compressor, a scroll compressor, and a piston compressor. The refrigerant used is R22, R407C, R417A, R410A, and R134a, wherein the coefficient of performance (COP) of the R410A rotor compressor with a nominal cylinder working volume of less than 8.5cm3 is 3.15, and the test performance coefficient should not be less than its nominal value. 95% of the value."

A company official who participated in the drafting of “Heat Pump Water Heater Compressor” stated that at present, heat pump water heater compressors use a variety of working fluids, so they need to be treated differently when setting standards. "In fact, heat pump water heater compressors should also include products that use CO2 refrigerants, the national standard for this product - GB/T26181-2010 "Household and similar CO2 refrigerant heat pump water heaters with fully enclosed motor-compressor" It was implemented on June 1, 2011. At the same time, the above-mentioned sources disclosed to the "Electrical" reporter that although considering that R22 refrigerant will destroy the atmospheric ozone layer will be eliminated, the "heat pump water heater compressor" will still R22 refrigerant compressor Inclusion, mainly considering that these products have a certain price advantage, can occupy the low-end market. At the same time, the "heat pump water heater compressor" standard also specifies the compressor noise, vibration, residual moisture, impurity content and so on.

Emphasis on reliability "At present, many companies have chosen lower-cost air-conditioning compressors, ignoring the reliability of the entire machine." Shanghai Hitachi Electric Co., Ltd. Heat Pump Product Manager Le Hongsheng said. It is understood that from the beginning of the development of the industry, heat pump water heater companies generally support the production of large-scale, low-cost, mature technology, air-conditioning compressors, but this compressor is designed for air conditioning design, not entirely suitable for heat pump water heater operating conditions .

“The heat pump water heater has a high hot water temperature. According to the GB/T23137-2008 National Standard for Heat Pump Water Heater for Household and Similar Uses, which was implemented on September 1, 2009, the water temperature of the heat pump water heater tank should reach 55°C. Therefore, the system needs to achieve high condensation. Temperature, which makes air-conditioning compressor failure rate is high, and even the life of the whole machine is reduced. Although many companies have also improved the heat pump water heater, increase the protection of the compressor, but can not fundamentally solve the problem.” Xi'an Qingan refrigeration equipment Relevant research and development personnel of the company limited.

According to the reporter, “Household and similar heat pump water heaters” does not require special requirements for heat pump water heater compressors. "Under the premise of achieving product performance and safety, heat pump water heater companies have no restrictions on whether they choose compressors for air conditioning or compressors for heat pump water heaters." Industry insiders said, "The implementation of "heat pump water heater compressor" can not be limited after this This situation will undoubtedly guide companies to purchase more reliable compressors for heat pump water heaters."

The responsible person of the National Household Electrical Appliances Standardization Technical Committee's main parts and components sub-committee for household appliances stated that when drafting "household and similar heat pump water heaters", the actual operating conditions for heat pump water heaters are worse than those of air conditioners and long operating hours. Compressor Accelerated Life Test Conditions Based on the actual operation of the heat pump water heater, several acceleration factors were considered (increased condensing temperature, longer running time, greater winter compression ratio, and larger summer flow rate).

According to the reporter’s draft of the “Heat Pump Water Heater Compressor,” the compressor was selected to perform one of the accelerated life tests in working condition A and working condition B (see Table 1). After the end of the test, the compressor is tested under standard conditions. The decrease in heating capacity and performance factor (COP) should not exceed 5% of the original measured value. The noise value should not exceed 3 dB (A) of the original measured value.

A relevant person in charge of an enterprise said: "The air conditioner compressors on the market are currently impossible to pass this life test. After the implementation of "heat pump water heater compressor", can effectively regulate the heat pump water heater compressor on the market, and on this basis highlights The reliability of this product leads the industry in the direction of this technology."