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There are geothermal anomalies in Pingdingshan mining area, the average geothermal gradient of up to 4.6°C /100m, which forms geothermal mine disasters. The formation of geothermal anomalies is more closely related to geological structure and groundwater. Using groundwater heat pump technology and air heat exchange system, exploiting the geothermal resources of these mines, which helps to reduce heat...
Four kind of modes of solar concentrator replacing the source of auxiliary steam system were proposed by integrating the characteristics of coal-fired units' auxiliary steam system. Theoretical analysis for the mode of solar concentrator replacing the forth steam extraction was conducted, showing the feasibility of the mode.
The briqutting of coal is a widely applied method for coal utilization. Water resistance of briquettes plays an important role in the storage and transportation of briquette products. In order to improve the water resistance of binderless lignite briquettes, the briquettes were heat treated and the effect of heating temperature and holding time on the water resistance of briquettes were investigated...
Three working fluids R125, R143a and R32 were analyzed thermodynamically for the transcritical heat pump with low temperature geothermal source as its heat source. The system parameters investigated include coefficient of performance (COP), volumetric heat capacity (Qv), compressor discharge temperature and the pressure ratio. The results show that Qv, pressure ratio and compressor discharge temperature...
The impact of freezing weather on the grid is increasing with the continuing deterioration of global climate. Previous existing studies about icing on the transmission line only considered the impact of climate condition according to the weather temperature, rainfall rate, air humidity, wind speed and other impact factors to calculate the ice load, and did not consider the ice-melting effect of the...
The design is bio-fuel raw material drying equipment which is cross-flow belt dryer based on high-temperature hot water as the medium. According to the drying experiments, obtained the drying curve of materials at different temperatures. Through the experimental data, the general parameters of dryer were determined. The features of this design is that heat from the high-temperature hot which comes...
Surface source heat pump system with freezing latent heat collection plays a significant role in energy-saving and environmental protection in districting heating of the cold areas. In the system, the surface water freezing latent heat exchanger is one of the key devices and its operating parameters are directly related to the heating performance. Based on the entropy generation theorem, the entropy...
The problems such as the easily frosting of the evaporator and the poor system performance in low outdoor temperature can be effectively solved with the solar-air dual-source heat pump technology. In this paper, based on the previous working of the research group, the steady distributed parameter method has been adopted to establish the mathematical model of a new solar-air dual-source heat pump system...
In order to improve the utilization of solar energy, we use the new flat-plate heat pipe in the solar photovoltaic/thermal (PV/T) system to meanwhile gain electricity and heat. In this way, the temperature of solar cell could be effectively reduced to improve power generation efficiency, and the heat dissipation of solar panel could also be stored up through the forced circulation of the aqueous solution...
Four types of double-stage Water-Lithium Bromide absorption heat pump systems were introduced to recover waste heat of about 40°C. Thermodynamic and heat transfer numerical simulation was carried out to predict the performance of these absorption heat pumps. The effects of the driving heat source (steam) input pressure, the waste heat outlet temperature, and the hot water inlet temperature on the...
Based on the mass and energy conservation equations, the mathematical models of a parallel feed and a mixed feed LT-MED desalination system were established, in which included evaporator, condenser, preheater, brine cooler etc. The steam temperature loss was considered which was caused by the boiling point elevation (BPE) of sea water and the flow resistance when steam flowing through tube bundle,...
This paper introduces the current state of solar heating system among Wanzleben city heating net. In view of low efficiency (only 20-30%) of this system, it analyses the shortcomings of this applied system from sensors' situation, fixed flow problem, the influence of the user's water temperature and the length of pipe separately. Some improving methods which are effective by theoretical analysis are...
In this paper, moat water source heat pump air-conditioning system is researched.The author field measuremented the temperature, flow and other parameters of Jinan moat water in summer, and determined the main parameters of the water in winter according to the measured data of Jinan moat water in previous years. The mathematical model of moat water source heat pump air-conditioning system is further...
In this paper, the oil return model of vertical U-tube ground heat exchanger in the direct expansion ground-source heat pumps was presented based on fluid mechanics principle. And the minimum refrigerant velocity was calculated according to nil oil volumetric flow rate and the relation between refrigerant velocity and interface velocity. The design of diameter and length for U-tube ground heat exchanger...
A desuperheater heat recovery system that includes a reversibly used cooling tower (RUCT) was studied by simulation and field tests in subtropical regions in China. This paper presents the field test of a RUCT heating system using heat pump (RUCTHPS) in winter installed in a test office building, which is located in Changsha, Hunan province, a hot summer and cold winter region in China. Instead of...
In this paper, the performance analysis mode has been established for gas and steam combined cycle with coke oven gas according to actual industry. The exergy analysis and calculation are carried on for the specific working condition. The exergy destruction of the whole system mainly concentrates on the combustion chamber and the waste heat boiler. Especially the combustion chamber occupied more than...
According to the basic formula of central heating system, the running adjustment formular is derived concerning it. On the basis of the formula, the running adjustment curve is obtained by using origin when adopting the different ways of regulation on both sides of heat exchanger. Finally with the outdoor temperature, it is concluded that the adjusting method of the variable flow and temperature of...
Based on elaborating the characteristics of capillary tube air-conditioning system, especially investigated the heat transfer property of this system cooling in summer, and establishes a two-dimensional mathematical model of steady-state heat transfer. In this paper, the Matlab program programmed by a micro-body heat balance method focuses the impact on the ceiling temperature field and the cooling...
In order to give some suggestions for energy conservation rebuilding, comparison analysis was carried out on the coal-fired industry boiler and steam kettle system. Three schemes of steam water reclaim from the steam kettle to the coal fired industrial boiler were put forward. The first scheme adopted a heat exchanger to reclaim the heat released from the condensate water and hot up the feed water...
In this paper the performance test results of a liquid desiccant air-conditioning (LDAC) system which uses waste hot water from combined cooling, heat and power system (CCHP) as driven heat resource have been presented. The supply air volume of the air-conditioning system is around 7000m3/h ~ 7500m3/h and its cooling capacity is about 60.43 ~ 95.74KW. It can maintain the supply air temperature under...
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