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Study of the Flow Characteristics of the Evaporative Condenser and the Energy Efficiency of the Evaporative Air Conditioning System

Author: LiuQingMing
Tutor: ZhuDongSheng
School: South China University of Technology
Course: Chemical Engineering
Keywords: Evaporative condensers CFD simulation Air-conditioning system Energy Heat Transfer
CLC: TB657.2
Type: Master's thesis
Year: 2010
Downloads: 214
Quote: 0
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Abstract


Energy and water conservation has become China's long-term energy planning objectives and social development requirements, but also solve the energy problems of today's primary ways; improve the reuse of water is the primary means of water conservation. Evaporative condenser as a new and efficient heat energy and water saving devices, energy and water resources in our country today, the growing tension has been the rapid development and application. Evaporative condenser is based on the theory of heat and mass transfer in unsaturated and condensation heat transfer theory developed by combining a highly efficient energy saving cooling equipment, and its working process involves the flow characteristics of two-phase flow, two-phase heat and mass transfer and its coupling. Condenser chamber of the flow field is very complex, how to optimize the design of the flow field, in this respect there is no mature theories and formulas, the need for further theoretical and experimental research. This article first evaporative condenser heat transfer process is analyzed to derive the mathematical model of heat and mass transfer, heat and mass transfer processes were analyzed, focusing on the heat transfer coefficient calculations. Pointed out that the main resistance to heat transfer from the water - air interface. This paper has also established a cavity air flow field numerical model, using computational fluid dynamics (CFD) software package was simulated to study the way into the wind, the air inlet structure on evaporative condenser cavity flow field characteristics and analyze their impact evaporative condenser heat transfer mechanism. The results show that: the use of multi-faceted air intake inlet side when compared with the same pressure, velocity distribution is more uniform; airflow inlet flow field structure is important for the cavity, representing a suitable inlet area can reduce the degree of airflow inlet turbulence to reduce the volatility of the internal pressure field strength, helps form a uniform flow field. Established the evaporative condenser chiller performance test platform. The effects of different inlet operation (single - double into the wind, the air inlet size) and wet bulb temperature on the evaporative condenser refrigeration unit performance, the results showed that: wet bulb temperature on the performance of evaporative cooling unit have a major impact, increased from 18.2 ℃ to 26.8 ℃, cooling capacity and energy efficiency were reduced by 20% and 27%, the compressor power consumption increases by 9.8%, wet bulb temperature increase per 1 ℃, EER decreased 3.42%, compression work increased 1.24%. Through the influence of the number of inlet analysis of experimental data shows that the structure of the refrigeration unit best way into the wind as a double into the wind, the best into the air damper is 4900m3 / h, when the wet-bulb temperature is 19.2 ℃, the refrigeration unit The maximum cooling capacity 32.3kw, EER 4.63; when the wet bulb temperature is 19.8 ℃, the maximum cooling capacity of 32, EER 4.6. Through the inlet area of ??the size of the impact analysis of the experimental data showed that the optimal coil inlet area and the heat transfer area ratio of 0.14, evaporative condenser refrigeration system energy efficiency can reach 4.1 to 4.5. This paper examines the different loads of conventional water-cooled and evaporative condenser air conditioning system performance, its practical application of engineering system was tested, the test showed that: evaporative air-conditioning system can well meet the building's comfort requirements. Test calculations for different load cases two kinds of air-conditioning system condensing temperature and the system COP. The results showed that use of evaporative condensing technology, water-cooled air conditioning units IPLV high ratio 21.1% 36.8% than air-cooled high. The engineering application of energy analysis shows that the evaporative condenser air conditioning system to achieve a good energy saving effect. The average annual energy consumption indicators than the transformation of the former water-cooled system is lower 16.01%, 27.3%, high SEER. This topic through evaporative condenser flow field analysis and air-conditioning system energy research, enrich the evaporative condenser system theory and applied research for the further study of evaporative condenser performance optimization and energy-saving air-conditioning system designed to provide a reference .

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CLC: > Industrial Technology > General industrial technology > Refrigeration Engineering > Refrigeration machinery and equipment > Refrigeration Equipment > Air conditioner
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