Jing Lv

Experimental Study on the Novel Solar Adsorption Refrigeration Cooling Tube

Using solar light as energy and compound adsorbent/water as working pair, the novel solar cooling tube was made and experimental studied in this paper. The experimental results show that, when the solar radiation was about 19.6-21.9 MJ-d -1 m -2 at the daytime, the temperature of adsorbent bed could reached to 220degC, the condensation temperature was about 45degC. In the nighttime, the evaporator temperature was about 15degC, the novel solar cooling tube could supply cooling mass about 300-390 kj and the COP is about 0.23-0.25 and the refrigeration power was varied from 15W to 2W.

Type Analysis of Rural Settlements Development of Hadaqi Region in Heilongjiang Province

This article takes rurals in Hadaqi Region in Heilongjiang province as research object. By collecting and processing data, we can analyze the type of transformation and application of rural settlements development on the type appeared in its development, in order to provide some reference for development of rural settlements in Heilongjiang province in the future.

The experimental study of shell and tube gas cooler in trans-critical carbon dioxide heat pump system

As one of the core devices of the carbon dioxide heat pump system, the level of heat transfer coefficient of gas coolers has direct impact on the performance and efficiency of the heat pump system. By selecting different experimental conditions, the thesis makes experimental studies about how parameters influence the coefficient of heat transfer on the shell and tube gas cooler when the system is running. Studies have shown that under the same pressure, with the increase of carbon dioxide and water flow, the average heat transfer coefficient of gas cooler also increases, but in the same state inlet temperatures of carbon dioxide almost have no effect on the average heat transfer coefficient and the maximum of heat transfer coefficient decreases gradually with the increase of pressure.

Application of EFDC to Density Stratified Flow

Environmental Fluid Dynamics Code (EFDC) was developed by Hamrick at Virginia Institute of Marine Science for estuarine and coastal applications. EFDC is a general-purpose modeling package for simulating three-dimensional flow, transport, and biogeochemical processes in surface water systems such as rivers, lakes, reservoirs, estuaries, wetlands and coastal regions. Use the 3-D numerical model EFDC simulated the density stratified flow in a slut. Compared the simulation and experimental data, the results showed that EFDC could accurately simulated the density stratified flow.

Improvement on Dyeing Performance of Different Bifunctional Reactive Dyes for Soybean Protein Fibers

This study assesses dyeing performance of reactive dyes with monofluorotriazine and modified cvinyl-sulfone bifunctional reactive groups in alkaline/acid denaturalization bath to the soybean fibers. It has been shown that 3~4 of the dyeing pH value, 60 minutes and 70°C of dyeing time and temperature were selected for denatured bath. The denaturalization bath can dramatically improve exhaustion and fixation and significantly decrease the chromaticity of the dyeing effluent. Besides, colorimetric properties, fastness and mechanical strength of the dyed fabrics were evaluated to indicate applicability of this dyeing process of soybean protein fibers.

Study of Circuit Number on the Evaporator in CO2 Heat Pump Water Heater

In the design of a carbon dioxide heat pump water heater evaporator, the effect of the circuit number on the evaporator is investigated numerically by EVAP-COND 3.0 version simulation package of American National Institute of Standards and Technology. It is found that as the circuit number increases the temperature difference between the air and the refrigerant increases, but it reduces the overall heat transfer coefficient. The evaporator capacity will rise firstly, and then drop with the circuit number and achieve the maximum in the optimum circuit number. Therefore, selecting the appropriate circuit number of the evaporator can significantly improve the efficiency and optimize the design.

Supercritical Carbon Dioxide Heat Exchanger Tube Numerical Simulation and Analysis

In this paper, the three straight casing tubes and the double helix casing tubes were modeled using the Gambit software. And the fluid flowing in tubes was simulated by Fluent software. According to the simulation results, with the field synergy principle, two casing tubes’ flow and temperature distribution of carbon dioxide and water have been analyzed. Simulation data show that the double helix casing tubes is better than the three straight casing tubes on heat transfer and synergy. Lay the good foundation for design optimization and efficiency of heat exchanger of carbon dioxide heat pump system.

Experimental Study on Effect of CO2 Heat Pump Evaporator on Frosting Condition

The theoretical analysis of frost formation had been made. The wind speed, temperature and relative humidity etc. had different effects respectively. A single heating was studied through the experiment. In different outdoor conditions, experimental data showed evaporator frost at the environment temperature of 10 °C, environment relative humidity was 70%. Comparing the experimental data, it is concluded that temperature of evaporator’s outlet is increasing with the outlet temperature. The refrigerant evaporation temperature and COP under different conditions has been tested. The relation of evaporation pressure and environmental temperature under different evaporation temperature had been concluded. According to the experiment, a defrost measure of this experiment equipment had been proposed.

Embedded Software Formalization Testing Method and its Application in Missile-Borne Software

The formal modeling method can accurately describe systems. Using formal method to test software improves the efficiency of software testing and it is comprehensive. Common real-time embedded software formal testing methods include Z language, finite state machine (FSM) and unified modeling language (UML), Petri net and time input/output automata (TIOA). This paper analyzes the characteristics of embedded software testing. The above formal methods and test case coverage criterions and test data collection methods are introduced. Combined with the characteristics of missile-borne software, this paper presents suitable ideas of testing missile-borne software.

Strategies Research of Rural Construction Status and Development of the Western Region in Jilin Province

The author used field investigation method to conduct field research in 50 villages in the western region of Jilin Province with questionnaire, interviews and other forms, and then selected 9 representative villages as typical samples to study. The writer finds existing problems in constructing villages and makes reasonable scientific Strategies in order to provide proper guidance to the villages which are under construction in western areas of Jilin province.