Development method of multi-zone frosting atlas suitable for predicating frosting degrees of air source heat pump
An air source heat pump and multi-zone technology, applied in lighting and heating equipment, damage protection, refrigeration components, etc., can solve the problems of insufficient detail, rough frosting area map, lack of actual measurement and experimental verification, etc., to promote false defrosting "Accidents, Reduction of False Defrost" Accidents, Effect of Good Applicability
Inactive Publication Date: 2017-03-08
BEIJING UNIV OF TECH
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Problems solved by technology
[0003] However, the current research on the frosting area map has the following problems: 1) The possible frosting range of the air source heat pump is clear, but it is still not detailed enough to guide the design and development of the defrosting control of the air source heat pump; 2) The frosting area The picture is rough, and only the possible frosting range is marked, but the specific frosting rate cannot be obtained from the picture; 3) The frosting map obtained is derived from simulation and lacks actual measurement and experimental verification
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Embodiment 1
[0036] Determine the extent of the map: figure 1 In the above, according to the main applicable temperature range of air source heat pumps and the temperature conditions of air source heat pump heating in areas without heating seasons (with the half-month average temperature as the dividing line), the abscissa (air temperature) range of the frosting map is set as -15 ℃~11.5℃, the ordinate takes the range of air relative humidity as 0~100%;
[0037] Determine the critical dew point line: use the temperature and relative humidity of the air to calculate the dew point temperature at any point on the frosting map, and then connect the lines with equal dew point temperatures to form an equal dew point temperature line; then according to the coil temperature T w vs. air temperature T a The calculation relation of T w =(1-k 2 ) T a -k 1 , select an air source heat pump, and get the corresponding k of the main engine through the field test 1 =10.26,k 2 = 0.17; any air temperature...
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The invention belongs to the technical field of predicating the frosting degrees of air source heat pumps, and relates to a preparation method of a multi-zone frosting atlas suitable for predicating the frosting degrees of an air source heat pump. The frosting degrees of an air source heat pump unit, a heat pump type room air conditioner and other devices under different environments are judged and predicated. According to the technical scheme of the method, an air source heat pump zoning frosting atlas including two lines, three zones and five areas is built with an environment temperature-humidity chart as the basis. The two lines are the critical dew formation line and the critical frosting line and divide the environment temperature-humidity chart into the three zones, namely, the non-frosting zone, the dew formation zone and the frosting zone; and according to the frosting degrees, the frosting area is divided into the five areas. By means of field testing and defrosting control application research, the air source heat pump zoning frosting atlas is systematically verified. According to the method, the frosting condition of the air source heat pump can be accurately predicated, the defrosting efficiency of the air source heat pump can be improved, the accident of false defrosting can be avoided, and a defrosting control method can be improved.
Description
technical field [0001] The invention relates to a method for developing a multi-region frosting map suitable for predicting the frosting degree of an air source heat pump, and belongs to the technical field of predicting the frosting degree of an air source heat pump. Background technique [0002] The defrosting problem of air source heat pump is unavoidable in actual operation. The ideal defrosting is "on-demand defrosting". Since frosting is a complex heat and mass transfer process, it is difficult for the unit to judge the exact defrosting start time in actual operation, resulting in "no frost defrosting" and "Frost does not defrost" accidents occur frequently. The problem of "wrong defrosting" has been difficult to be effectively solved. The main reasons include: 1) The direct frost measurement technology is difficult to realize; 2) The indirect frost measurement method is not accurate and cannot be applied to different regions and different meteorological conditions; 3...
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Login to View More IPC IPC(8): F25B47/00
CPCF25B47/00
Inventor 王伟朱佳鹤白晓夏孙育英吴旭
Owner BEIJING UNIV OF TECH