最新刊期
      卷 32 ， 期 1 ， 2011
      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.001
        摘要：After introducing the state of arts of HCFCs alternatives,the thermodynamic properties,cycling performance and flammability of the typical HCFCs refrigerants R22 and R502 and their traditional substitute refrigerants(R410A,R407C,R404A,R507A),and several kinds of alternatives for R22 with low greenhouse effect(R161,R290,RTJU4,R32,R717 and R1234yf) which could be used for air-conditioning,freeze and refrigeration are analyzed and compared.The result shows that the R161,R290,RTJU4,R717 and R32 with zero ODP an...  
        关键词：engineering thermophysics;HCFC-22;refrigerant;Alternative;greenhouse effect;R161;R290;R32;RTJU4;R1234yf;R600a   
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      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.007
        摘要：In order to improve the performance of the prototype NH3-H2O-LiBr absorption chiller without heat regenerators,the concept of this kind of refrigeration system with single or double regenerators was firstly proposed,and the corresponding experiments of the two prototypes were carried out respectively.The experiments indicated that pressure in the generator could be significantly reduced during the process of generation after adding lithium bromide to the system for the single regenerator system,so the syste...  
        关键词：pyrology;Absorption chiller;Ammonia-water-lithium bromide;regenerator;coefficient of performance   
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      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.012
        摘要：The industry is always making efforts to reduce the R134a charge with new heat exchanger,which results in the decrease of direct emissions of R134a to the environment.The refrigerant charge in conventional mobile air conditioning system and the mobile air conditioning system with micro-channel evaporator and the sub-cool condenser is investigated.The experiment results show that the new heat exchangers have reduced charge quantity of R134a obviously.And there is an optimum refrigerant charge quantity that c...  
        关键词：pyrology;Optimal refrigerant charge;Enthalpy potential method;Mobile air conditioning system;Sub-cool condenser;micro-channel evaporator   
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        发布时间：2024-08-02
      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.016
        摘要：In order to study the transient performance of variable refrigerant flowrate(VRF) air conditioning system,a dynamic simulation model is built based on simplified gas-liquid two-phase fluid network model.The numerical model consists of the dynamic lumped-parameter accumulator model,the moving-boundary condenser and evaporator model,steady-state compressor and electronic expansion valve model.And the numerical model is calculated by the software of Matlab and Simulink.The comparison with experimental data of ...  
        关键词：pyrology;refrigeration;air-conditioning;VRF;dynamic simulation   
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        发布时间：2024-08-02
      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.023
        摘要：A 10HP variable refrigerant flowrate air conditioning system(VRF AC) with digital scroll compressor was developed.Based on the unstable running characteristics of the VRF AC,the new control strategy including the control model of compressor output ratio and control measure of switching between compressors has been proposed.In the control model of compressor output ratio,the average value of discharge pressures in an adjustment period is used as the current discharge pressure to regulate the output capacity ...  
        关键词：pyrology;VRF;Digital scroll compressor;control strategy;Output ratio;coefficient of performance   
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        发布时间：2024-08-02
      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.028
        摘要：A five-stage Auto-cascade refrigeration cycle(ARC) is brought forward.According to the experiences that different systems with different components and proportion of mixed refrigerants can result in different evaporating temperature,the components selecting principle of non-azeotropic mixed-refrigerants is analyzed and the components are selected.The calculated methods of mixtures in ARC system is discussed.R22,R23,R14,R740 and R728 are selected as refrigerants in this system based on the requested conditio...  
          
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        发布时间：2024-08-02
      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.033
        摘要：To predict the steady performance of scroll water source heat pumps with different configuration and working conditions,a steady systematic model for scroll water source heat pump is established.In modeling the compressor,the effect of suction heating on mass flow and the effect of discharge heat exchange on discharge temperature as well as coupling relationship between mass flow,discharge temperature and input power are considered.The effect of the superheat of evaporator on the mass flow through the elect...  
        关键词：pyrology;water source heat pump;Computer simulation;scroll compressor;experimental validation   
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      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.038
        摘要：The effect of liquid quantity and concentration change of binary solution on water loss were investigated in the process of vacuum cooling.A vacuum cooling device was used to carry out the experiments.The effect of water quantity and container shape on water loss rate was analyzed.The influence on binary solution of vacuum cooling was studied by using different concentration of sucrose solution.The concepts of Relative Water Loss Rate,Relative Height and Relative Concentration are put forward in order to fa...  
        关键词：pyrology;vacuum cooling;Water loss;Relative water loss rate;Solution concentration   
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      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.043
        摘要：TiO2-BaCl2-H2O is a kind of new latent heat nanofluids which can be used for phase change cool storage.The influences of volume fraction of TiO2 nanoparticles and temperature on the viscosity of latent heat nanofluids TiO2-BaCl2-H2O are measured.The research results show that the presence of TiO2 nanoparticles increases apparently the viscosity of latent heat nanofluids,and the increment effect becomes more obvious with the increase of volume fraction of TiO2 nanoparticles.The viscosity of latent heat nanof...  
        关键词：engineering thermophysics;latent heat;nanofluids;TiO2;viscosity   
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      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.046
        摘要：The observation of leak detection on site for vapor compression refrigeration system showed that foamy leaks might be found by foamy test,even when maintaining pressure test met the requirement of national standard GB50274-98 code for construction and acceptance of refrigeration and air separation equipment installation engineering.To address this issue,different effects of foam and maintaining pressure test,as well as leakage rate criterion for maintaining pressure test in GB50274-98 were studied.It is sho...  
        关键词：pyrology;refrigeration system;Pressure test;Leakage evaluation   
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      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.051
        摘要：In order to solve the problem of cooling nonuniformity in forced air pre-cooling for vegetables and fruits,five vent-hole types were designed,and a physical model and a numerical model were established.The commercial software FLUENT was employed to simulate the cooling process of potatoes with five types of vent-holes,respectively.The simulation results show that the cooling rate was highest and the pre-cooling uniformity was best with 32 non-uniform vent-holes.Our experimental data agree reasonably with th...  
        关键词：pyrology;Differential pressure cooling;vent-hole type;cooling rate;Pre-cooling uniformity   
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        发布时间：2024-08-02
      • Vol. 32, Issue 1, (2011) DOI: 10.3969/j.issn.0253-4339.2011.01.058
        关键词：pyrology;heat pump drying;experiment;tilapia;process parameters   
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        发布时间：2024-08-02
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