Ying Ning Hu

Study on Ground Source Heat Pump System of Combined Office and Residential Building in Hot Summer and Warm Winter Region

A ground source heat pump system of combined office and residential buildings in hot summer and warm winter region is introduced. The system performance is studied through the experiment, and the performance of underground heat balance is analyzed by TRNSYS. The results show the superiority and applicability of the ground source heat pump system.

Predicted Model of Cutting Force for Single Diamond Fast Milling Hard-Brittle Materials

t is known that cutting force is the key to reasonably select cutting parameters, and the base to study the cutting mechanism. Genetic Algorithm and multiple regression analysis were adopted to achieve cutting force predicted model of multi-diamonds fast milling hard-brittle materials with defined diamond grains pattern by single diamond fast milling hard-brittle materials experiments. Results show that cutting force predicted model by genetic algorithm has higher precision than that model by multiple regression, and the cutting force prediction method based on genetic algorithm is more suitable for those hard-brittle materials which components are relatively soft and simple. Predicted model can afford another study direction for processing analysis of diamond tools, tools making and processing parameters selection from the view of diamond grain practice cutting.

Hourly Simulation Study of Intermittent Operating Conditions for Ground Heat Exchanger in the Hot Summer and Warm Winter Areas

This paper dynamically simulates the soil source heat pump air conditioning system of a library in Nanning with the eQUEST software combined with the geology and climate characteristics, unit parameters. Comparing the simulated values with the measured values to verify the correctness of the model. Then simulate and analyze the variation of ground temperature rise at well bore with long-term intermittent operation for the system and the influence of different well spacingground and backfill materials thermal conductivitywell depth on the outlet temperature and the ground temperature rise at well bore. The simulation results show that the reasonable selection of relevant parameters has important significance to improve the operating performance and economy of the system.

The Research of the Ground-Source Heat Pump Air Conditioning System Applied in Large Scale Gymnasium in Hot Summer and Warm Winter Zone

The paper is on research of the operating characteristic of the ground source heat pump air conditioning system that applied in large scale gymnasium in hot summer and warm winter zones, combining with operating characteristic of the real application of the GX autonomous regions gymnasium project. Utilizing the SPSS software aiding the Multivariate nonlinear Regression analysis, via MATLABs optimization methods for optimizing and stimulating to obtain the most economic, practical and reliable mode and the optimal system parameter. The purpose of this research lies in making it available for the system to exert its best working condition and providing reference for real project design.

The Study of Ground-Source Heat Pump in Multifunction Building in Hot Summer and Warm Winter Zone

Taking one multifunction building in Guangxi as example. The paper introduces the author team who independent design and imply a ground-source heat pump (GSHP) and cooling tower hot water and air-condition joint supply system (GCHAS) which application in a multifunction building in hot summer and warm winter zone. The system performance is analyzed through the experiment. And the result of experiment proves the superiority and economy of ground-source heat pump technique in multifunction building. The author also research how to realize the energy saving and comprehensive application of ground-source heat pump work in multifunction building.

Performance of Diamond Cup Wheels with Nano-Scale Rare-Earth Oxide and Carbide

Diamond cup wheel is one of important tools for machining of ceramic tile. In this paper, ceramic tiles were ground by diamond cup wheels which segments adding nano-scale rare-earth oxide and nano-scale carbide on a special designed test machine. The wear resistance of diamond cup wheels and materials’ removal process of ceramic tiles had been tested, and grinding ratio were calculated and compared. Different grinding ratios can be obtained according to different technological parameters. The segments of adding nano-scale rare-earth oxide and nano-scale carbide were observed from microgram and metallography structural pattern. The results showed that nano-scale rare-earth oxide and nano-scale carbide can fine structure, make grain boundary clear and increase grasping of diamond grits.

Thermal Contribution Rates of Double-Heat Sources of the Direct-Expansion Solar-Ground Source Heat Pump System in Hot Summer and Warm Winter Area

According to the energy-consuming characteristics of buildings in hot summer and warm winter area, a direct-expansion solar-ground source heat pump system is put forward. This system runs the direct-expansion solar heat pump system in summer and direct-expansion solar-ground source heat pump system in transition season and winter to produce hot water. The article analyses the thermal contribution rates of double-heat sources of the system under various working conditions in different seasons. Results indicate that the total area of solar evaporators matches the power of units and the matching value is 2.18m2/kW. When the average daily total solar radiation is 15.8MJ/m2 in summer, 11.2MJ/m2 in transition season and 11.2MJ/m2 in winter, the unit area heat transfer are respectively about 1.48kW/m2, 1.1kW/ m2 and 0.43kW/m2. The annual solar thermal contribution rate is 46.4% and the annual soil thermal contribution rate is 32%, which can reduce 57.96% quantity of heat absorbing from the soil.

The Application of Ground Source Heat Pump to Indoor Constant Temperature Swimming Pool Water Heating in the Subtropical Region

Taking one club as example, the application of the subtropical region ground source heat pump technology on indoor constant temperature swimming pool water heating load calculation and type selection of equipment is introduced. The system performance is analyzed through the experiment. The energy consumption cost of this technique is compared with electric boiler and oil-fired boiler, and the result shows ground source heat pump technique is superior and economic.

Study on Match and Running Features of Heat Multi-Level Shunt Ground Source Heat Pump System in the Hot Summer and Warm Winter Areas

Annual cold heat adjustment is one of the key problems in the practical application of ground-source heat pump system. According to the energy-consuming characteristics of the building in hot summer and warm winter area zone and engineering practice, the author puts forward the multi-level heat shunt ground source heat pump systems(GSHPS). Reasonable system can be matched according to the characteristics of the cold water chiller and the water source heat pump, which takes full advantages of soil cold/heat source, improves the efficiency of the soil heat exchanger, and balances underground temperature field effectively.

Experimental Study of Heating-Cooling Combined Ground Source Heat Pump System with Horizontal Ground Heat Exchanger

A hot-water and air-conditioning (HWAC) combined ground sourse heat pump(GSHP) system with horizontal ground heat exchanger self-designed and actualized was presented in this paper. The heat transfer performance for the heat exchanger of two different pipe arrangements, three layers and four layers, respectively, was compared. It showed that the heat exchange quantity per pipe length for the pipe arrangement of three layers and four layers are 18.0 W/m and 15.0 W/m. The coefficient of performance (COP) of unit and system could remain 4.8 and 4.2 as GSHP system for heating water, and the COP of heating and cooling combination are up to 8.5 and 7.5, respectively. The power consumption of hot-water in a whole year is 9.0 kwh/t. The economy and feasibility analysis on vertical and horizontal ground heat exchanger were made, which showed that the investment cost per heat exchange quantity of horizontal ground heat exchanger is 51.4% lower than that of the vertical ground heat exchanger, but the occupied area of the former is 7 times larger than the latters.