最新刊期
卷 27 ， 期 5 ， 2006
- 摘要：A simulation model was built to study the sensibility of different physical parameters (including physical parameters in the indoor heat exchanger,the outdoor heat exchanger and the compressor) to HCR_S of a conventional fixed speed heat pump in China. The result shows that all the parameters do not affect the HCR_S significantly.1485|348|0更新时间：2025-09-03
- 摘要：The basic structure of a thermoelectric refrigerator driven by solar cells was described. A theoretical model of a solar thermoelectric refrigerator was set up and numerical simulation of the system was performed. The effect of different solar insolation rate and velocity of air on solar thermoelectric refrigeration system was analyzed. The results indicate that there is an optimum solar insolation rate,at which the system can achieve maximum cooling production. When the solar insolation rate is about 200-1000 W/m2,COP for the specified system decreases with the decrease of insolation rate. Under given conditions,the system working current increases in the direction of the optimum system working current with the increase of air velocity.1510|341|0更新时间：2025-09-03
- 摘要：In this study,glucose and PVP were used as main protective reagents to lyophilize human red blood cells. Factors affecting uptake of glucose in red blood cells including extracellular glucose concentration,incubation temperature and time were optimized. Then the mixtures of red blood cells loaded with glucose and protective solutions were lyophilized. The results show that the uptake of glucose was dependent on extracellular glucose concentration,incubation temperature and time. Moreover,the onset temperature of crystal measured by DSC decreased with the increase of PVP concentration,but excessive vitrification may not fit lyophilization of red blood cells. In addition,the free hemoglobin concentration of lyophilize-rehydrated red blood cells was lower than 1g/L. In conclusion,lyophilization of human red blood cells by glucose and PVP is feasible,but how to reduce the osmotic injury of PVP is critical.1579|355|0更新时间：2025-09-03
- 摘要：A compact solar pump-free LiBr absorption refrigeration system was set up with new-style devices such as falling film absorber,falling film evaporator,lunate thermosiphon elevation tube. In order to improve the performance of the whole system,a second generator was designed to maintain the higher differential concentration and absorptivity in lower initial solution concentration (46%-54%) and to enhance the performance of absorber. The yield of distilled water increases by 1.68 times as compared with that of the system without a second generator . The second generator also helps increase the pressure difference between the evaporator and the condenser to improve the performance of the whole cycle. The average coefficient of performance (COP) reaches up to 0.725.1522|349|0更新时间：2025-09-03
- 摘要：Cryomicroscope is an important tool in the study of cryopreservation of biomaterials. The accuracy of temperature measurement is influenced by the location of the thermocouple and the volume of the sample. The temperature distribution on the cryostage was numerically simulated and verified with experiments. The results show that the temperature of the sample can be estimated from the measured value of the thermocouple placed on top of the cover glass,and the planar temperature distribution of the cryostage is approximately uniform.1721|359|0更新时间：2025-09-03
- 摘要：A new type of chiller system relying on desiccant potential discharging was constructed based on the energy storage mode using liquor desiccant potential,which was able to provide cooling resource for air conditioning system and especially for radiant cooling air conditioning. The mechanism about the energy storage mode-using desiccant potential was explained. The influence of evaporative temperature,cooling water temperature,and liquor concentration on the normalized cooling capacity of the system was calculated and analyzed theoretically. The results show that the system could obtain chiller water for air conditioning under designated operation conditions and the high-normalized cooling capacity could reach 10 kW. In addition,the minimum temperature of the chiller water provided by the system depended on dew point temperature of the air after dehumidification.1673|335|0更新时间：2025-09-03
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Investigation on Construction of the Food Freeze Sublimation Drying Equipments and Heat Transferring
摘要：The match of cryotrap and desiccator,the way of heat transfer on heating board,and heat system design were analyzed to solve the problems of design,manufacturing technique,and structure of the food freeze sublimation drying equipments in the freeze-dried food production process. The comparison experiment for conduction and radiation heat transfer was conducted. The result shows that radiation heat transfer is better than conduction heat transfer between heating board and aluminum tray.1542|327|0更新时间：2025-09-03 - 摘要：The Burnett pvT measurement system was improved. Eighty pressure-volume-temperature data points for HFC-227ea in the gaseous phase were measured using Burnett-isochoric methods. HFC-227ea sample was filled in the apparatus only once. The experimental data were collected along 10 isochores for temperatures from 310-410 K and pressures up to 3.2 MPa. The density of each isochore was based on the pressure-density relationship at 410 K,which was obtained from the Burnett analysis. A three-term truncated virial equation of state (EOS) was developed for gaseous pvT property of HFC-227ea. The pvT data and acoustic data calculated with the present viral EOS agree well with the experimental data,respectively.1602|337|0更新时间：2025-09-03
- 摘要：A rod-baffle condenser with spirally corrugated and sawtooth-shaped finned tube was used in a water-cooled air conditioner system. The testing result shows that this air conditioner has higher performance. Compared with air conditioners using normal finned tube( lower fin) condenser,the refrigerating capacity of this air conditioner increases by 3.7% and energy efficiency ratio increases by 8.5% while heat transfer area of the condenser decreases by 37.5% under the rated working conditions and using R22 as refrigerant.1597|317|0更新时间：2025-09-03
- 摘要：Laminar mixed convective heat transfer of supercritical CO_2 in a horizontal mini duct with an equilateral triangular cross section was investigated numerically. The flow patterns and isotherms in the duct with a hydraulic diameter of 0.5 mm,under cooling condition,with and without gravity,were obtained. The local Nusselt numbers were also presented. The results suggest that the effects of buoyancy force,variable physical properties of the fluid,and duct geometric characteristic on flow and heat transfer can be very significant. The results of this work are helpful for the design and optimization of the high efficiency compact supercritical carbon dioxide heat exchangers.1631|343|0更新时间：2025-09-03
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- 摘要：Based on classic constant heat flux Cylindrical Source Theory,the variable heat flux Cylindrical Source Model of Vertical U tube was developed to simulate short time step long-term operation performance of GSHPS operating in variable heat transfer rate by quoting the idea of superposition principle and load aggregation. The present model was verified theoretically and experimentally with citing examples. The numerical simulation of heating performance of a Solar-earth source heat pump was performed with the improved Cylindrical Source model. The results indicate that the energy-saving rate of SESHPS is 8.3%-14.5% compared with ground source heat pump (GSHP) for application in Qingdao. The combined operation mode 2 with water tank in which the heated water flows through the solar collector first and then through the buried coil is preferable. The area of solar-collector and the length of buried ground coil can be calculated respectively either by the energy ratio of 63% to 37% or by size ratio of 13.8m to 1m2. In addition,SESHPS may be economically viable only when the price of solar collector per square meters is smaller than the drilling cost of 5.81 m length.1588|320|0更新时间：2025-09-03
- 摘要：To get the tube fin heat exchanger's performance curve relationship,a series of experimental studies and numerical simulations were cautiously carried out. At the same time,as another part of the 3-D numerical simulation work,this tube fin heat exchanger's internal temperature,velocity and pressure fields were shown in this paper. From the results of experimental study and numerical simulation,we found that the real tube fin heat exchanger's transfer factor j is 12% lower than that of the simulation model,while the friction factor j is 4%-16% increased. Fin spacing and density of the staggered tube bundle have much more influence on its performance,when the distance between fins decreased or the tube distributing density increased,heat transfer of the exchanger will be strengthened and pressure drop will be distinctly aggrandized.1638|326|0更新时间：2025-09-03
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