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This paper makes an introduction of the working principle and the technical and economic benefits of the combined ground-source heat pump and water energy storage system. And then according to the characteristic of this system itself and its mode of operation, we can point out that the energy storage rate, the local policy of electricity price and the strategy of operation are the main factors which influent the economic characteristics of the system. Using the initial investment and the operation cost of the system as the economy evaluation index, we respectively analyze the influence of the above factors on the index. And wish the results of the analysis can provide reference on the design of this new type air-conditioning system.

The wind environment of a district is calculated and analyzed with numerical simulation by CFD software Fluent. It analyzed concretely the air flow pattern around buildings and velocity profile, in order to provide a theoretical basis for the utilization of buildings wind power.

Applying TRNSYS, this paper introduced a numerical simulation of annual dynamic air conditioning load for the standard floor, the refuge floor and the top floor of a high-rise building in Tianjin. Results suggest that even though the refuge floor and the top floor share similar load characteristics of heating & cooling air-conditioning, they have different load sizes, and the load characteristic of the standard floor is different from them.

This paper proposed an approach for a control, which fuzzy logic method was designed and used in the refrigeration system based on the summary of the common control methods on electronic expansion valve (EEV) and variable speed compressor(VSC). The experiment had been carried out, that showed the fuzzy logic controller achieve more stable superheat and water temperature values against to a disturbance and had good energy saving potential.

Controlling the concentration of contaminants in wards to prevent airborne infection is an important issue in hospital. The effect of supply airflow of down-feed air curtain, which locates between patients and doctors/nurses, is to separate wards into two spaces, one for patients and the other for doctors/nurses. The controlling effects of air curtain on contaminants emitted by patients are numerically simulated under different air arrangements. In a laboratory model, the smoke of burning Zang incense serves as the source of contaminants. Particles’ concentration of contaminants was tested with a laser particle counter at different sites whether the air curtain was running or not. Draughty feel on patients caused by supply airflow of air curtain was researched in this study. Results of the present study revealed that air curtain could control contaminants effectively, and the supply airflow did not make patients discomfort basically. Finally, the appropriate air outlet location and distance between air curtain and patients were suggested.

Hybrid biofilm reactor has become a technically as well as economically feasible option for treatment of industrial wastewater. This article presents a critical review of some basic mathematical biofilm models. Mainly focus on the development and the solution of these models. The aim is to find a reasonable and simple model of hybrid biofilm reactor under aerobic and anoxic conditions and to simulate the decontamination of petrochemical wastewater.