High-cold Area Research Articles

The Application of a Solar–Air-Source Heat Pump Dual-Supply Heating System in a High-Cold Area in China

Solar energy is the most available renewable resource and has great potential for various applications. Solar heat pumps are limited when operating alone due to weather and the unstable and intermittent nature of solar energy. The idea of combining a solar collector with an air-source heat pump (ASHP) is proposed to solve the problems. Taking solar energy and air energy as the heat source of the system can improve the heat collection efficiency and heating performance coefficient of the dual-supply heating system in realizing the efficient and stable operation of the whole unit. This study investigated the application of a solar–air-source heat pump (S/AS-HP) dual-supply heating system for a residential building in Lhasa and compared the winter work performance and economic benefits of three different heating forms: solar–air-source heat pump, air-source heat pump, and solar–electric auxiliary heating systems. A simulation model was established and analyzed using the measurement data. The results show that during the heating period, the temperature of the primary side water supply is stable at about 60 °C, and the total operating hours of the solar collector period accounted for 26.9% of the total hours, of which 23.16% were independent operating hours. The average COPsys of the solar–air-source heat pump is 4.21, which greatly improves work performance compared with other systems, and the annual cost is the lowest among the three forms for the same service life at 41,824.6 CNY, saving 9.6% and 35.1% per year compared with the air-source heat pump system and the solar–electric auxiliary heating system. Considering conditions in alpine regions, S/AS-HP systems are the optimal heating solution for single buildings.

Study of experiment in field for long-span cable-stayed bridge

In order to provide the reasonable optimization measures for the construction of long-span steel bridge deck pavement in the alpine area, the actual pavement effect under the real load is studied by simulation simulation with the finite element analysis software relying on the construction of the bridge deck of No.1 Bridge of Haidong Avenue, Ledu District, Haidong city. Through different load positions and loading methods, the control load loading points are determined, and the parameterized analysis is carried out for the elastic modulus, thickness and temperature difference of the pavement, and finally the structural parameters of the pavement suitable for the bridge are obtained; the experimental analysis results show that the theoretical calculation idea adopted is feasible, and the measured value is within the expected range. It can be seen that the construction optimization measures and suggestions are of great significance to the construction of steel bridge deck pavement in the high cold area.

Characteristics of Tunnel Water Inrush and Progress in Grouting Materials in Mira Mountain Tunnel

Mira mountain tunnel is located in high altitude and cold area. Due to the influence of fragile ecological environment such as thin air and complex geological conditions, the tunnel would be liable to cause geological hazards. This paper will analyze the characteristics and causes of geological disasters in Mira mountain tunnel, combined with the research progress of grouting water stop material for tuff tunnel in high altitude and high cold area, so as to further guide the actual grouting construction and reduce the risk of geological disasters.

GPIT生物制剂对高寒区杏树抗冻丰产的作用

GPIT生物制剂对高寒区杏树抗冻丰产的作用

Preparation of SBS Modified Emulsified Asphalt in High Cold Region

A kind of SBS modified emulsified asphalt for highly cold area was studied by experiments. The research includes two aspects: the first is preparation of SBS modified asphalt. The influence of temperature, time, shear rate and development time on asphalt modification are determined, so as to determine the process of SBS modified asphalt. On this basis, the blending ratio of SBS modified emulsified asphalt was determined by experiments. The results show that the emulsified asphalt produced by the equipment is of good quality and good ductility.4%SBS latex content can make emulsified asphalt meet the standard requirements, but only 6%SBS latex content can obtain better road performance. Although the softening point of SBS modified emulsified asphalt prepared by this method is still low, it can meet the requirements of high cold area.

Physiological and Biochemical Characteristics of Dongnongdongmai 1 before Wintering in High-Cold Area

Developing crop cold-resistance is an important breeding target in cold areas.Although simulated experiments have been conducted in house for selecting cold-resistant varieties,it is not clear the performances of varieties in the field,especially the step-by-step cold exercise in simulated experiments is hardly consistent with that in natural condition.Dongnongdongmai 1 is winter wheat(Triticum aestivum L.) cultivar that can bear low temperature and grow normally in Heilongjiang Province.To pro-vide basic data for cold-resistant breeding and cultivation in wheat,several physiological and biochemical characteristics related to cold resistance were compared using Dongnongdongmai 1(winter greening rate more than 85% in spring) and Jimai 22(cold sensitive,winter greening rate less than 1% in spring).Both cultivars were planted in field condition and sampled at different dates(different temperatures) before wintering.The samples were separated into leaves,tillering nodes,and roots,respectively.The results showed that soluble sugars,soluble protein,proline,chlorophyll content,superoxide dismutase(SOD) activity,and peroxidase(POD) activity of Dongnongdongmai 1 were higher than those of Jimai 22.Water contents in different organs and rela-tive electric conductivity of Dongnongdongmai 1 were lower than those of Jimai 22,indicating Dongnongdongmai 1 had higher adaptability to coldness than Jimai 22.Tillering node was the most important organ for safely wintering because it contained more substances related to cold-resistance than leaf and root.