在广州酒店晚上怎么叫服务

Professional manufacturer of water source heat pump and ground source heat pump

News and information

Current location: home page ?>? News and information
The new national standard of low temperature air source heat pump is issued to speed up the survival of the fittest!
Publisher: Spring Island ground source heat pump release time: July 10, 2020

According to the latest news, the latest national standard of low ambient temperature air source heat pump was released on June 2 and will be implemented in April 2021. The name of the standard is GB / T 25127.1-2020 and GB / T 25127.2-2020, which are used to replace the previous GB / T 25127.1-2010 and GB / T 25127.2-2010. The standard is applicable to the unit which takes air as hot (cold) source and can produce hot (cold) water at ambient temperature not lower than - 25 ℃.

?

?

Three experts are invited to have a more comprehensive understanding of this standard. They are respectively one of the main drafters of this standard, Shi Wenxing, doctoral supervisor of Tsinghua University, Tang Zhijun, chief engineer of Shanghai Haili Ruineng, and Ye Xin, chief engineer of Guangzhou Chunguang. Let's look at the specific analysis——

?

Positive significance of new standards

?

The new standard is more applicable. Different application scenarios and working conditions are taken into consideration. The new standard fully considers the situation of different terminals, and differentiates the energy efficiency, water temperature and noise. For example, the outlet water temperature at the radiant end of the floor is not required to be very high. If the effluent temperature of 41 ℃ is uniformly used for testing, the application will be limited, When the end form is radiator, the outlet water temperature is relatively high, the energy efficiency value is relatively low, and the noise value is relatively high,

?

In addition, the energy-saving requirements are higher, the overall requirements of energy efficiency limits become higher, and the characterization method is more reasonable. In order to meet the actual situation, the APF and HSPF values are used to replace the original IPLV value in the energy efficiency evaluation system, which avoids the irrationality of setting the value of the working condition artificially when measuring the IPLV value, and can reflect the energy saving of the equipment more.

?

In addition, a significant change is the increase of the energy efficiency limit at - 20 ℃, which has curbed the practice that once the temperature drops, electric auxiliary heating is needed.

?

1、 The temperature range of cryocooler is further reduced to - 25 ℃

?

How low ambient temperature should the so-called "low temperature air source heat pump" meet before it is qualified? The old standard in 2010 stipulated - 20 ℃, while the new standard further expanded to - 25 ℃. (there is no - 25 ℃ refrigeration assessment for the whole refrigeration condition)

?

?

In fact, with the progress of core parts and control system, the low-temperature environment that low-temperature air source heat pump can adapt to has been continuously reduced in recent years. There are many products that claim to be able to stably heat at - 35 ℃. However, it can not be ruled out that some cryocoolers have serious attenuation at about - 20 ℃. Although they are branded as cryocoolers, they are difficult to realize the functions of cryocoolers. The new standard further clarifies and reduces the operating temperature of low-temperature heat pump, which is equivalent to raising the industry threshold and making the pseudo "cryocooler" withdraw from the market.

?

2、 Dividing household and commercial by heating capacity of 35kw

?

The cooling capacity of the 2010 version is 50KW, but the single heat unit has no refrigeration function and no standard cooling capacity. What standard should this unit implement? This brings confusion and loopholes to the previous design, production and monitoring.

?

It is more scientific to use 35kw as heating capacity in 2020. Even if it is a low-temperature heater, the refrigeration capacity of more than 50KW is basically 30HP, and many of the 25HP units are less than 50KW. All the machines above 15p should be included in the commercial standard, and the commercial standard is more stringent. The cop requirement of the wind disk working condition is 2.3 (the user requirement is 2.1). In this way, 20HP and 25HP machines will pay more attention to energy efficiency ratio.

?

3、 The classification of units is further refined

?

The 2010 version is divided into integral type and split type according to the unit structure type. The 2020 version is divided into single hot type and cold warm type according to the unit function on the basis of 2010 version. According to the matching end of the unit, it is divided into floor radiation type, fan coil type, radiator type and others. According to different functions, the ambient temperature of different temperatures is specified. For example, the temperature range of single hot type is - 25 ℃ ~ 21 ℃ The ambient temperature of cold and warm units is: - 25 ℃ ~ 43 ℃.

?

?

According to the three terminals, the new version is divided into three different models, which is more conducive to the choice of users. For example, for some reconstruction projects, the original radiator end can be used directly, and the outlet temperature and unit configuration are designed specifically for the radiator, with higher efficiency and stronger practicability.

?

4、 Cop, HSPF and APF are subdivided

?

The new version 2020 is divided into floor heating, wind disc and radiator on the use side. The outlet water temperature corresponding to - 12 ℃ and - 20 ℃ of dry bulb temperature is 35 ℃, 41 ℃ and 50 ℃.

?

In 2010, there was only one 41 ℃ standard, and the new standard subdivided different use sides, and the energy efficiency requirements of different outlet temperatures were also different. The coefficient of performance of water at 41 ℃ has been improved. It is possible that the sampling is more accurate and the calculation method is different. Other working conditions are more detailed, and the EER of refrigeration is also improved by 0.1. The coefficient of heating performance at - 20 ℃ is specified.

?

5、 The heating performance test requirements of low-temperature units are added

?

Referring to the European test method, this test method is more scientific and useful for testing the seasonal energy efficiency. The specific test method of the manufacturer is defined. The new version has detailed provisions on the treatment of steady and unsteady state in the heating sampling process, and the test requirements are higher.

?

The test and calculation methods of seasonal energy consumption and annual performance coefficient under refrigeration and heating conditions are specified in detail, including different places of use. The calculation is more accurate, so as to approach the energy consumption assessment of the actual use process of the unit as far as possible.

?

6、 "Experiment and calculation method of seasonal energy consumption of low ambient air source heat pump (chiller) units" was added in 2020 edition

?

Similarly, referring to the European standard seasonal energy efficiency, the comprehensive energy efficiency calculated according to different ambient temperature and the corresponding annual heating time of the ambient temperature is closer to the actual use situation, which is in line with international standards. After the introduction of this standard, enterprises need to spend more time to debug the heating capacity of units under different working conditions to obtain higher comprehensive energy efficiency.

?

7、 The tolerance is relaxed

?

The temperature fluctuation of nominal heating effluent is ± 0.5 ℃. In 2010 version, the temperature fluctuation of nominal heating effluent is ± 0.3 ℃. The fluctuation range is widened, but the calculation requirements are improved and the balance is complemented.

?

8、 More inspection items

?

Taking commercial aircraft standards as an example, the type inspection has been increased from 21 items to 33 items, and many indexes of salt spray test and protection level are standardized, which is more conducive to the performance control of different application scenarios.

?

?

For example, in coastal areas, salt spray corrosion is serious, and the products passing the salt spray test can meet the normal use. The increase of inspection items is the embodiment of higher requirements for unit performance after the expansion of heat pump application scenarios.

?

9、 The content of the name plate is more comprehensive, which is conducive to the selection of the unit

?

Taking the commercial standard as an example, the contents of the name plate can be read out directly from the appearance of the unit, so that the user can understand the use of the product. Taking the cold and warm type as an example, only 14 parameters have to be reflected in the original standard, while 23 indexes need to be reflected on the name plate in the new standard, and the newly added parameters that must be marked include the maximum current, electric auxiliary heat power, etc., which are of positive significance for the selection of power line specifications and the estimation of electricity charges.

?

For example, the newly added maximum current can directly determine the power line specification selection. Through the newly added electric auxiliary heat power, it is convenient to estimate the operation electricity cost, and eliminate the possibility of some products' vague propaganda of important parameters.

?

10、 Appendix added

?

The main page number has been added in the appendix by 23 pages. "Appendix A, heating performance test requirements; Appendix B, test and calculation methods of seasonal energy consumption; Appendix C, noise test method".

?

In the old version, only Appendix A, IPLV (H) calculation method of other typical cities, only the seasonal energy efficiency of heating, refrigeration reference GB / t18430.1-2007.

?

The new edition has detailed regulations on the treatment of steady state and unsteady state in heat sampling process, and the test requirements are higher; The test and calculation methods of seasonal energy consumption and annual performance coefficient under refrigeration and heating conditions are specified in detail, including different places of use. The calculation is more accurate, which is to approach the assessment of energy consumption in the actual use process of the unit as far as possible; there are detailed provisions for noise test.

?

Generally speaking, the implementation of the new standard provides the performance requirements, test methods and evaluation basis for the local government departments at all levels to carry out the bidding work; at the same time, it also provides the basis for the production and manufacturing of such products, which greatly ensures the safety, reliability and applicability of such products in actual use. It plays a positive role in guiding and promoting the promotion and application of low ambient temperature air source heat pump unit products, and has a positive significance to standardize the development of the industry.

Mobile phone: 13930808229
Tel: 0312-3102617
??????????? 0312-3102616
?????????? ?0312-3104576
Email: bdchundao@163.com
Address: 2699 Xiangyang North Street, Baoding
Scan and add wechat account
Ms. Yang
Ms. fan