The Optimized Design Of Constant Temperature And Humidity Air-conditioning Systems Used In Precision Laboratory

With the continuous improvement of modern industrial production technology and the precision requirements of products, production workshop the velocity field, temperature field and humidity field of production workshop is also rising. The high-precision constant temperature and humidity air conditioning system is increasingly dependent on. But in order to meet the requirements of constant temperature and humidity, air conditioning system are required smaller supply air temperature difference and larger ventilation, So there will be larger reheat energy consumption. The total energy consumption in our society, building energy consumption accounts for about 20.7%, HVAC energy consumption among building energy consumption has accounted for more than 60%. Therefore, reducing energy consumption of the air conditioning system goes far-reaching in saving resources. In this paper, by analyzing the actual project of constant temperature laboratory of energy measurement center in Harbin Metrological Verification Academy, constant temperature and humidity air conditioning systems are analyzed and discussed. Establish a steady physics model, simulate the constant temperature and humidity systems, and then analyze the energy conservation.This paper describes the importance of constant temperature and humidity air-conditioning systems in various trades and industries in today, introduces the basic principle and the required conditions of the constant temperature and humidity air-conditioning system, and emphasizes the importance of air distribution systems to the constant temperature and humidity air-conditioning system. This paper aimed at finding the most economical and reasonable air distribution pattern under the premise of meeting the technical requirements and human comfort. The article focuses on the sorts, characteristics, selection conditions of the air-conditioning system airflow patterns. And analyzes the influence of temperature difference of supply air on energy saving of the constant temperature and humidity air-conditioning system. For our professional purposes, energy consumption of air-conditioning system is mainly associated with the airflow forms of organization and treatment process of air. In this paper, we mainly research the influence of air distribution systems to the constant temperature and humidity air-conditioning system.In this paper, the laboratory’s velocity field, temperature field and relative humidity field is researched through CFD numerical simulation. Establish laboratory’s physical model and simplify the interior work area and person. The article simulate a variety of airflow programs: lateral supply air; diffuser supply flat air; diffuser supply downward air; roof orifice supply air. By comparing the results of simulation, select the optimal form of airflow, roof orifice supply air, according to the uniformity of the velocity field, temperature field and moisture field. Then the model is simulated under conditions of different temperature difference of supply air. In order to reducing reheat energy and energy consumption, choose the maximum temperature difference under the premise of the technical requirements. Comparing the simulation results analysis, for temperature precision requirement of ±1.0℃, humidity precision requirement of 50±5% of the system, choose Supply air temperature difference of 7 as the optimal design.