a transcritical co 2 Heat pump accelerated life test system and method
A technology of accelerated life and experimental methods, applied in the field of heat pumps, can solve the problems of high investment cost, high cost, and no economy
Active Publication Date: 2020-03-31
XI AN JIAOTONG UNIV
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Problems solved by technology
At the same time, conventional lifetime research methods are difficult to directly apply to transcritical CO 2 On the heat pump unit, CO 2 The initial investment cost of heat pump units is higher than that of conventional units. Generally, the number of samples that need to be used is relatively large, and sometimes dozens of CO 2 Destructive tests for heat pump units; it is very uneconomical and expensive to use conventional life research methods
Method used
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[0023] a transcritical CO 2 The heat pump accelerated life test method includes the following steps:
[0024] Step 1: Determine CO 2 In the actual operating environment of the heat pump unit, the ambient temperature T under the worst working conditions air / ℃, and the outlet water temperature T of the heat pump unit w_o / °C.
[0025] Step 2: Determine the sample size as N, where N is an integer considering the economic cost. Generally, due to CO 2 The cost of the heat pump unit is relatively high, and the cost of destructive accelerated life research is relatively high. Therefore, a more feasible solution is to set the value of N as small as possible, preferably 2-3.
[0026] Step 3: Determine the required acceleration factor AF according to the Weibull distribution and the number of samples, and determine the exhaust pressure and exhaust temperature at the same time.
[0027] Step 4: Test according to the determined acceleration conditions, and obtain the test duration ...
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The invention discloses an accelerated life experiment system and method for a transcritical CO2 heat pump. The method comprises the steps of 1, determining operation parameters of the worst working condition; 2, determining the number of samples under the allowable economic cost; 3, determining an accelerated factor according to Weibull life distribution; 4, performing an experiment to obtain a test duration of damage of at least one unit; 5, after a heat pump unit runs normally for one year, collecting the temperature of a running environment in one year, determining a running duration corresponding to the running temperature and the corresponding accelerated factor; and 6, predicting actual operation life of the heat pump. The method disclosed by the invention has the advantages that the error is small in the life prediction of the transcritical CO2 heat pump, and the method is economical and efficient.
Description
technical field [0001] The invention relates to the technical field of heat pumps, in particular to a transcritical CO 2 Heat pump accelerated life test system and method. Background technique [0002] With the development of the economy, energy has become the main material basis for the survival and development of human beings. In countries all over the world, the problem of energy shortage is becoming more and more obvious, which has become an obstacle to the rapid development of the economy. Energy saving and low carbon, as the mainstream direction of social development today, guide the development direction of technology applications in all walks of life. Secondly, environmental issues also restrict the rapid development of human society. The damage of traditional refrigerants to the ozone layer and the impact on global warming have attracted much attention. transcritical CO 2 While providing high-temperature hot water, the heat pump system is not only environmentally...
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IPC IPC(8): G01M99/00F25B9/00
CPCF25B9/008F25B2309/06G01M99/002G01M99/004G01M99/005
Inventor 殷翔曹锋王驿凯
Owner XI AN JIAOTONG UNIV