Heat exchange efficiency evaluating method of indirect evaporation cooling energy recoverer
An evaporative cooling and energy recovery technology, applied in heating methods, space heating and ventilation, household heating, etc., can solve problems such as incompatibility, inability to express and evaluate sensible heat transfer, etc.
Pending Publication Date: 2020-02-07
TIANJIN CHENGJIAN UNIV
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Problems solved by technology
Among them: the wet bulb efficiency can only be used to evaluate the sensible heat transfer process of the fresh air channel. When condensation occurs in the fresh air channel and latent heat transfer occurs, the wet bulb efficiency is not applicable at this time; the dew point efficiency is suitable for dew point indirect evaporative cooling System evaluation; latent heat efficiency and amplification factor can only be used to evaluate the change of latent heat transfer. When only sensible heat transfer exists, these two methods are only expressed as fixed values of 0 and 1, which cannot be expressed at all for sensible heat transfer ; Although the total heat exchange efficiency takes into account the change of sensible heat transfer and latent heat transfer, its change trend is quite different from that of the total heat transfer, so it cannot be used to evaluate the heat transfer performance of indirect evaporative coolers
However, experimental studies have found that the above methods are not adaptable
Method used
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Embodiment
[0061] The purpose of this embodiment is to find a performance evaluation index that can perfectly evaluate the indirect evaporative cooler.
[0062] 1. Experimental comparison of the existing performance evaluation indicators of IEC.
[0063] For details, see accompanying drawing 5, which shows the changes of 6 indicators obtained by the test of the fresh air side wind temperature constant at 35°C and the relative humidity changing at 30% to 90% (that is, the change curve of 6 indicators under the constant temperature and humidity change condition). It can be seen from Figure 5(a) that with the increase of relative humidity, the wet bulb efficiency does not change significantly, but when the relative humidity of the air inlet on the fresh air side is higher than 40%, the wet bulb efficiency begins to decrease significantly. The reason is that with the higher air humidity on the fresh air side, the higher the dew point temperature, the more condensed water will be precipitated...
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The invention relates to a heat exchange efficiency evaluating method of an indirect evaporation cooling energy recoverer. The method is characterized by being suitable for arid regions and medium-temperature humidity and high-temperature high-humidity regions, adopting the enthalpy efficiency to evaluate the heat exchange capacity of the indirect evaporation cooling energy recoverer and comprising the specific steps of: real-time acquisition of fresh air side and exhaust side parameters in a working state; calculation of wet air enthalpy; and calculation of enthalpy efficiency nh. The methodhas the following beneficial effects: the new enthalpy efficiency is used for replacing the wet ball efficiency to evaluate the heat exchange performance of the indirect evaporation cooling energy recoverer. Through comparison and analysis of experimental data, the enthalpy efficiency is highly consistent with the change tendency of total heat exchange quantity of the system; and no matter whethercondensation exists on the fresh air side or not, the performance of an indirect evaporation cooler can be evaluated.
Description
technical field [0001] The invention belongs to the technical field of refrigeration and air conditioning, and in particular relates to a heat exchange efficiency evaluation method of an indirect evaporative cooling energy recovery device. Background technique [0002] Compared with the traditional central air-conditioning fresh air system, the evaporative cooling technology uses water evaporation to absorb heat to reduce the air temperature, and there is no other equipment that consumes electric energy except for driving the fan and water pump. Water is used as the refrigerant in the evaporative cooling process, so the evaporative cooling refrigerant does not cause any harm to the environment, and water can be recycled and easily obtained, so it is an ideal refrigerant. At the same time, the use of water's phase change evaporation latent heat refrigeration makes it have a higher refrigeration coefficient. At present, evaporative cooling technology has been widely used in r...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F24F5/00
CPCF24F5/0035F24F2110/32F24F2110/22F24F2110/12
Inventor 郭春梅刘起隆
Owner TIANJIN CHENGJIAN UNIV