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The modelling of physical systems is very important phenomena in today's world due to easy understanding of their dynamics. There are several methods to model the physical systems, one of which is the bond graph technique which is the graphical representation of the physical dynamics of the systems. In this paper, we have modelled the heat mechanism of a biomedicai baby incubator that is used to keep...
To reduce the energy consumption of evaporation process in alumina refinery, thermal and exergy analysis were applied to the four-effect evaporators and three-stage flashes evaporation system. Result indicates that the thermal efficiency of the evaporation system is only 15.22%. The thermal efficiencies of all links are high except that of the evaporator of effect IV, which is only 6.91%. The heat...
Evaporative condenser is one kind of high-efficient and energy-water saving heat exchange equipment, which has been widely applied in many engineering fields. The theory and product characteristic of evaporative condenser is introduced in this paper. A new type of the application of evaporative condenser in waste heat recovery is presented. The effect of energy saving is obvious, wide application...
The heat transfer coefficients of the evaporative water flow in mini/microchannels are studied experimentally to explore the novel heat dissipation for high power electronics. Two sets of parallel channels which are 61 channels with hydraulic diameter of 0.293mm and 20 channels with hydraulic diameter of 1.2mm are investigated respectively. The inlet and outlet temperatures of fluids, and the temperatures...
In this paper a computationally cheap analytical state space model of a saucepan situated on an induction hob is presented. This model allows calculating the main heat fluxes that take place in the system and, as a consequence, it can play a key role to improve the efficiency of the system. It may also be useful to design an accurate temperature control for the cooking process. Combining both aspects,...
In this paper a direct heated solar desalination system was designed, his system can raise the fresh water production through avoiding the heat loss between collector and desalination and increasing the first stage evaporation temperature. The effects of solar radiation on the highest seawater temperature and fresh water production are researched. The results indicated that the system has a high fresh...
Combining the heat recovery technology of heat pipe and evaporative cooling technology, this article researched a heat recovery heat pipe-type indirect evaporative cooling air-conditioning unit and tested this unit. Based on analyzing we got main perfoprmance factors and best operation parameters. The best ratio of volume of secondary air and primary air is 0.8, the best water delivery is 0.322 m3/h,...
The aim of the present study is to clarify the thermal performance of the radiant cooling system with Water Flow on Roof, which employs the evaporative cooling effect on the roof surface. In this paper, the thermal performance of this system is discussed from a point of view of the coefficient of performance, using a test house. Measurement results reveal that the indoor globe temperature of the test...
Environmental control programs are beginning to implement water resources control strategies based on transpiration models. Most transpiration studies of greenhouse crops have been undertaken under cold conditions in northern and central Europe. The ventilation process in a local plastic greenhouse was studied using three-dimensional computational fluid dynamics (CFD). A simple greenhouse crop transpiration...
A GWHP (groundwater source heat pump) experimental apparatus with superheated vapor heat recovery has been constructed in this paper. In the presetting working conditions (the inlet and the outlet temperature of the cooling water are respectively 18??C and 26??C, and the inlet and the outlet temperature of the chilled water are respectively 12??C and 7??C), the effects of the superheated vapor heat...
Configuration of solar-assisted heat pump water heater with an innovative truncated-cone-type evaporator was designed. Mathematical models of parts of every system were set up. The results showed that when the average absorbance of solar radiation of a solar-assisted heat pump water heater with a truncated-cone-type evaporator was 7.2 MJ, the coefficient of performance(COP) of the system was 3.1 under...
The two-stage water evaporative cooling system (TSEC) has advantages of lower energy consumption, lower costs, higher environmental friendly and higher cooling efficiency than the direct water evaporative cooling system (DEC) and the indirect water evaporative cooling system (IEC). The experimental and theoretical analysis in this paper results show that the TSEC system not only has favorable application...
A conventional solar still equipped with a self sustainable humidification-dehumidification open air flow stream to enhance the system productivity was investigated. This modification maintained higher temperature difference between the saline water to be evaporated and the condensing surface. Accordingly, higher driving force for the evaporation-condensation processes was provided. This was achieved...
This paper presents the experimental investigation to determine the condensation and evaporation heat transfer coefficients and pressure drops for the flow of R22 through internally grooved copper tubes namely B16-46 and D12-52. A series of experiments were conducted to evaluate the condensation and evaporation performances of the internally grooved copper tubes. Condensation tests were conducted...
A solar assisted water source heat pump for Radiant Floor Heating (SWHP-RFH) experimental system with heat pipe vacuum tube solar collector as heating source and radiant floor as terminal device is proposed in the paper. The Mathematics Model of dynamic coefficient of performance (COP) for SWHP-RFH is presented after analyzing the operation principle in different conditions. The influence of the inlet...
Based on the analysis of the mechanism of the falling film evaporation and the falling film condensation, a new solar desalination system with three effect regeneration was made. The simulation experiment of the system was worked out in the steady condition, the fresh water yield rate and performance radio under the different temperatures was given. According to the experimental results, not only...
The seawater desalination system with falling film evaporation was set up, which was driven by solar-wind energy. In addition, the basic principles of system operation were expounded??and the main factors affecting the system performance were discussed. The results showed that the latent heat of vapor and the heat of brine were utilized repeatedly in the system. In addition, the system had a higher...
Based on the mechanism of the falling film evaporation and condensation. A three-stage tower type of desalination unit has been designed. Meanwhile the heat and mass transfers are analyzed and studied according to results from the references regarding falling film evaporation and condensation on pipes and plates. The influences of the operating temperature, temperature of cooling water, the flow rates...
Face the energy crisis in the world, it is important to improve the utilization efficiency of the energy conversion. The evaporation characteristic of the falling film outside heat pipe in the vacuum as a good evaporation method was studied in the paper. The negative pressure falling film evaporation on the horizontal heat pipe experiment set was constructed. The impacts of the spray water load, spray...
The evaporation resistances of loosely-sintered copper-powder evaporators were measured in operating flat-plate heat pipes. The evaporation processes was also visualized through a top glass plate. Irregular or spherical powders of different size distributions were investigated. Uniform heating of 16-100 W/cm2 was applied to the base plate near one end with a heated surface of 1.1??1.1 cm2. At the...
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