The main advantage of solar cooling is that cooling loads and solar gains occur at the same time, at least on a seasonal level.There are several ways to get solar cooling effect, amongst them thermally driven chillerbased and desiccant systems are promising, because they can be used for integration of heating and cooling together, and can have a high solar energy conversion efficiency.This paper is devoted to present and analyze the energy conversion process, the cooling cycle, the advancement of new technology, etc., with respect to the most often used thermally driven solar cooling technologies.

Thermoacoustic refrigeration is one of most attractive research area in the field of cryogenics and refrigeration.Inside the thermoacoustic refrigerators and engines, energy conversion and transportation are realized through elaborately-arranged acoustic pipes and heat exchangers.This article introduces our recent research results, which cover the oscillating flow thermodynamics, thermoacoustic refrigerators for both cryogenic and domestic refrigeration and simulation with computational fluid dynamics.

A review of the prior research on horizontal-tube falling-film evaporator used in refrigeration is presented.The review mainly includes falling film flow and heat transfer mechanism, such as intertube flow modes, falling film characters, film thickness over the horizontal tubes, flowing refrigerant gas, heat transfer and so on.Except for, the technology for flow uniformity and stability and methods of avoiding dryout had been summarized.On the base of prior study, a new technology to improve flow uniformity and stability and avoid dryout had been introduced, which includes the flow-leading and second liquid-distributing.The flowing-leading technology could give a steady liquid flowing without gas interference by fixing different enlarged fins on the under-side of the horizontal tube, and the second liquid-distributing technology could ensure the liquid distributing uniformly without dryout by collecting and distributing the liquid along the gas channel.The new technology has been proved to ensure liquid flowing steadily and distributing uniformly along the horizontal tubes without dryout efficiently.

Ammonia, with excellent thermal-physical properties, is a kind of natural and sustainable refrigerant.The paper introduces some new technology developed recently in application of ammonia such as the cascade refrigeration cycle using CO₂ as a secondary refrigerant in an ammonia refrigerating systems, and the technology of water chiller using ammonia.Otherwise, the paper discusses the development trends of ammonia refrigeration technology, including safety guarantee, high efficiency, miniaturization and automation.

A mathematical model for exergy analysis has been built to investigate the performance of liquid desiccant dehumidification and cooling system based on LiCl solution.Efforts are focused on exergy loss in each component, as well as the influence of desiccant solution and air inlet parameters on dehumidifier (demonstrated by exergy efficiency of dehumidifier).It was found that: (1) air velocity and humidity have dominanted influence on dehumidifier performance; (2) in the liquid desiccant dehumidification and cooling system, the biggest part of exergy loss happens in solution-hot water heat exchanger, 24.5%, followed by solution-solution recuperator and cooling water-solution heat exchanger, which accounts for 24.4% and 22.8% respectively.Reducing exergy loss in heat exchanger is the key way to improve the system exergy efficiency.

Adsorption isosteres of the silica gel (SG) -water adsorption refrigeration working pairs were obtained.Several adsorption equations have been fitted to the experimental points in order to get the adsorption equation, which could be used for the simulation of the silica gel-water adsorpion chiller.Besides, two composite adsorbents were also developed to enhance the heat transfer.One is obtained by mixing expanded graphite and silica gel.The other is developed by adding a binder into silica gel.The results show that when the mass ratio of the binder in the composite adsorbent is 1.1%, the amount of the water desorbed is increased by 13.8% for first 5min; and it is increased by 2.5% for 15min.To conclude, the composite adsorbent can shorten the cycle time.The composite adsorbent with expanded graphite has the same performance as the composite adsorbent mixed with binder.And both of them have advantages and disadvantages.

Due to the increasing development of nano-technology and its practical application, many researches on nanofluids find that nano-particles can enhance heat and mass transfer.In this paper, a series of experimental investigations are conducted to observe the stability of carbon black nano-particle suspension with different concentration of nano-particles and ammonia solution in order to apply nanofluid to the adsorption system.Mulsifier OP-10 is used as surfactant.The concentration of nano-particles in the nanofluid and surfactant in the nanofluid is considered as the key parameters.Based on Langmuir adsorption theory, a model for optimal and minimum mass concentration ratio of nano-particle and surfactant is established, in accord with experiments.

In this paper, how the key parameters of mixed refrigerant cycle of small scale natural gas liquefaction process in skid-mounted package affect the process performance (including specific power consumption, liquefaction rate, specific refrigerant flowrate and specific cooling water charge) is labored from thermodynamic point of view.These key parameters include temperature of separator S1 and S2, pressure of mixed refrigerant, inlet pressure of natural gas and storage pressure of LNG, components of natural gas and mixed refrigerant.The optimizer of original mode in Aspen HYSYS is used to optimize SP-MRC (mixed refrigerant cycle in skid-mounted package) and find the operating conditions which minimize LNG specific power consumption (objective function).The research reveals that the change of temperature, pressure and component fraction at the same time will influence the process performance remarkably.The new SP-MRC adopts the technology of integral incorporated cascade which combines heavy and light hydrocarbon.It can reduce the quantity and volume of compressors and heat exchangers in the guarantee of higher liquefaction rate and lower specific power consumption.

In order to study the effects of surfactant，sodium dodecyl sulfate (SDS), on formation of new-type cool storage medium-isobutene gas hydrates, a small agitating type gas hydrate preparation apparatus was designed.With the constant volume method, the isobutene gas hydrates formation with and without surfactant SDS was studied.Results showed that compared with the situation without SDS, the induction time decreased by 18min with SDS, and the gas fraction in formed hydrate increased，because surfactant SDS can effectively reduce the interfacial tension of gas-water contact and accelerate the rate of gas molecules’ entering into gas-water interfacial layer.Besides, the induction time was very close(about 20 min) under different SDS concentrations (0.8×10^-3,1.0×10^-3 and 1.2×10^-3), and the amount of formed hydrate tended to coincide.

The mathematical model of enthalpy recovery wheel is established.Based on this model, the effects of wheel thickness, wheel rotational speed and air velocity on the enthalpy recovery efficiency of enthalpy wheel are investigated.Three different desiccants, namely silica gel, lithium chloride and silica gel-lithium chloride composite, are used as desiccant material. The results demonstrate that, silica gel-lithium chloride composite desiccant is the first choice for enthalpy recovery wheel in comparison to silica gel and lithium chloride.And there exist optimal rotation speed, wheel thickness and air velocity.For silica gel-lithium chloride composite, the corresponding values are respectively 12 r•min^-1, 100 mm and 1.2 m•s^-1 under calculation conditions.

Experimental study on heat transfer characteristics of nanorefrigerant CuO-R113 flow boiling inside a horizontal smooth tube with total length 1.5m and outside diameter 9.52mm was performed.The test conditions were as follows: the mass flux is from 100 to 200 kg•m^-2•s^-1，the heat flux is from 3.08 to 6.16 kW•m^-2， the inlet vapor quality is from 0.2 to 0.7, the mass fraction of nanoparticles is from 0 to 0.5%.The experimental results showed that the heat transfer coefficient of nanorefrigerant CuO-R113 is larger than that of pure refrigerant R113, the flow boiling heat transfer is enhanced by adding nanoparticles.When mass flux is 100 kg•m^-2•s^-1, heat transfer coefficient increases 29.7% maximally.When mass flux is 150 kg•m^-2•s^-1, heat transfer coefficient increases 22.7% maximally.When mass flux is 200 kg•m^-2•s^-1, heat transfer coefficient increases 25.6% maximally.

An experimental study of frictional pressure drop characteristics of R410A-oil mixture flow condensation inside a 5 mm internally spiral grooved enhanced tube was performed to investigate the influence of oil concentration, vapor quality and mass flux on the frictional pressure drop.The experimental conditions include the condensation temperature of 40℃, the mass flux from 200 to 400 kg•m^-2•s^-1, the heat flux from 4.21 to 8.42 kW•m^-2, the inlet vapor quality from 0.3 to 0.9, nominal oil concentration from 0 to 5%.The test results show that the frictional pressure drop of R410A and R410A-oil mixture increases with mass flux and vapor quality; for R410A-ester oil RB68EP mixture, the influences of oil on frictional pressure drop are relevant with vapor quality.At the range of low and intermediate vapor qualities, the presence of oil will reduce the frictional pressure drop, which descends 29% maximally as the oil concentration increases from 0 to 5%; while at high vapor quality, on the contrary, the presence of oil will increase the frictional pressure drop, which enhances 8% maximally as the oil concentration increases from 0 to 5%.

The objective of the present work is to simulate the discharging process of a packed bed of combined sensible and latent heat thermal energy storage tank.Accounting to the disadvantage of the model in previous researches, the model with effective apparent heat capacity is used to calculate the process of heat transfer in the packed bed.This model is simpler than porosity model that was always used to simulate this problem before, and it more accurately describes the process of heat transfer and flow in the TES tank.The numerical results are verified by the experimental results.The numerical results are synchronously analyzed, which show the flow field affect the characteristic of discharge energy process intensively.

This paper is concerned with the theoretical analysis to obtain the effect of water inlet temperature on the performance of the proposed falling film evaporator combined with vapor-lift effect.Results indicate that the transported liquid flow rate and transportation height ratio (ratio of the pumping height to the driving suction depth) increase with higher water inlet temperature.However, higher water inlet temperature results in the decreasing of falling film thickness which leads to higher heat transfer coefficient.Moreover, the enhancement on the heat transfer performance decreases with increasing water inlet temperature.Theoretical analysis shows when transporting the same water flow rate, the water inlet temperature increases from 30℃ to 90℃, and the heat transfer coefficient increases by 66.8% to 69.3%.

Comparison of characteristic between R417A and R22 in the air source heat pump water heater was studied, and the coefficient of performance(COP), power, condensation pressure and exhaust temperature of the compressor on different seasons were tested.The results show that the performance of R417A is closer to that of R22 in the air source heat pump water heater; the exhaust temperature of R417A is lower than that of R22, so the system is more safety; the condensation pressure of R417A is also lower than that of R22, which means that the higher temperature water can be got under the same condensation pressure; and R417A is more environmental protection so it is more befitting for R417A than R22 used in the air source heat pump water heater.

Experiments were conducted to investigate the storage effect of Kuala fragrant pear.The pears are stored under two different kinds of storage conditions with different temperature and humidity.One part of the pears are stored under hyo-on storage condition of which the temperature is -1.7℃ and the humidity is 87%，and the other part are stored under common storage condition of which the temperature is 3℃ and is without humidifying device.The quality of the pear is detected periodically.The research results show that the storage effect of hyo-on storage is more superior to that of common storage.

In this paper，the flow boiling heat transfer characteristics of the TiO₂ nanoparticles and HFC134a mixtures were investigated in a horizontal tube with the nanoparticles concentration of 0.01 g•L^-1，0.025 g•L^-1，0.05 g•L^-1.The results indicated that nanoparticles increased the flow boiling heat transfer coefficient of the refrigerant，and the improvement was related to the nanoparticles concentration.The key factor may be the surface deposition characteristics.

In order to propose a method and strategy of regulating chilled water and air volume through cooling coil at the same time under part load of air-conditioning system，this paper studies the thermal characteristics of cooling coil under variable-volume condition.By creating mathematical model of cooling coil，the authors simulate the influence of variable chilled water volume，variable air volume and both of above on performance of cooling coil under different chilled water temperature and obtain the change regulation of thermal characteristics of cooling coil.Then the change of cooling coil performance in the view of energy-saving，optimization and control of the system is analyzed.The paper presents foundation and reference for variable-volume control strategy of cooling coil under part load of air-conditioning system.

Vacuum insulated panels are distinguished by their outstandingly low thermal conductivity，which is approximately 0.004—0.01 W• m^-1•K^-1，only 33% to 10% of that of the traditional heat preservation materials.The heat preservation mechanism of vacuum insulated panels is elaborated in the study，and the key elements that relate to the thermal property of vacuum insulated panels are analyzed，which include the pretreatment of core materials and the vacuum pressure.With time passing，the thermal conductivity of the VIPs can maintain a low value when pre-treated.The thermal conductivity of the vacuum insulated panel made in our lab were below 0.01 W• m^-1•K^-1.By analysis and calculation，with this kind of VIPs applied to refrigerated containers，its exciting properties can not only meet the intensity requirement，enlarge the ship load due to its thin thermal insulation layers，but can also save energy consumption by more than 26.82% compared with traditional heat preservation materials.

The direct evaporative internal-melt ice storage air conditioning is a new and promising technology.It is important to master the ice coil heat transfer performance for the project.The paper analysed the dynamic characteristics and established the corresponding mathematical models of the system，and used the model to analyse the performance of caving cooling process changes.The model for direct evaporation in the U-shaped ice-melting ice storage VRV system couldbe helpful to design and optimization theory.

A new type of internally cooled dehumidifier based on the plate-fin heat exchanger (PFHE) was designed，the mathematical model of the dehumidification process was established.The temperature and absolute humidity of the air distribution within the dehumidifier was discussed.Effects of internally cooled on solution temperature and mass transfer driving potential was discussed.The results present that the internally cooled dehumidification could effectively inhibit desiccant temperature increasing in dehumidification process，but only have little effect on mass transfer driving potential.In the typical operation condition，the average temperature of solution in internally cooled dehumidifier is 4.83℃ lower than that in adiabatic dehumidifier，and integral average moisture difference in internally cooled dehumidifier is 0.38 g•kg-1 higher than that in adiabatic dehumidifier.

Parallel flow condenser is a new type of higher and compact heat exchanger，its application in domestic air conditioner still has some problems to be unsolved.Yang & Webb’s recommended correlations of heat transfer and friction coefficients were employed in this paper to simulate and study the influence of flat tube structure on heat transfer and pressure drop performance.The result shows that reducing the number of flat tube inner hole，inner hole width，inner hole height，or the aspect ratio will raise the refrigerant-side heat transfer coefficient and pressure drop.The result provides a theoretical basis for selection of flow parallel flat tube parameters for the domestic air conditioner condenser.

A new absorption chilling cycle is presented.On this absorption chilling cycle，the solution heat exchange base on membrane distillation mass transfer principle instead of that in general absorption chilling cycle，it is called membrane distillation heat exchanger，so the heat exchange process with non-constant concentration，and the generating temperature of steam is reduced which is important to use low qualified heat energy and improve COP of absorption chiller.The ideal cycle and the theoretical cycle are discussed，whose difference depends on the thermal conductivity of membrane and difference of the vapor pressure between the hot and cold solution.

Efficient and reliable storage systems for thermal energy are important requirement in many applications where heat supply or availability did not coincide.This study focused on the evaluation of heat transfer enhancement in storage systems used building air conditioning systems.A numerical model describing the melting process was presented by considering the difference of the solid-liquid density and natural convection.The two-dimensional melting process of ice ball filled with aluminum foam was numerically simulated at the third boundary condition, from which the authors could get the temperature field and phase change interface positions changed with time, and compared it with pure ice.The simulation results showed that melting time filled with aluminum foam was greatly shorter than that with water only.The effect of aluminum foam porosity on melting time was also analyzed: melting time became longer with the increase of aluminum foam porosity.

A new micro-channel gas cooler for CO₂ heat pump water heater was designed.The calculation program was developed using finite elements method.Fluid flow and heat transfer processes in both sides were analyzed.And the influences of major parameters on gas cooler and the pressure drop of the CO₂ side were discussed.The model developed in this paper could be used for the optimal design of gas coolers and it is expected to offer useful guidelines for system design and its optimization.

Mathematical models for pressure drop through both the compressor suction pipe and the evaporator returning pipe in ammonia pump feeding refrigeration system are developed.The system cycle〖DK〗’s performance parameters are simulated by a computer program, which are developed based on both the pressure drop models and the thermal parameters models of the ammonia refrigerant.The program was used to simulate an ice making refrigeration loop with a capacity of 100 kW, a 102 m long compressor suction pipe and a 152 m long evaporator returning pipe.The simulation results show that,comparing to the traditional pipe selecting method, the pipe size optimized by the program is capable of increasing the system COP by 7.6% which corresponds to an annual energy saving of 9092 kW•h.The further analysis shows the cost caused by the optimization can be recalled within two years.The life period of refrigeration compressor can be extended because its discharged temperature reduced evidently after pipe size optimization.

All the measures have uncertainty and error.The uncertainty and error of solar heat gain test facility were analyzed in this paper, the uncertainty of each parameter and the influence degree to measuring results were gained, the uncertainty of fan-coil unit heat transfer and the influence degrees of fan-coil unit inlet and outlet water temperature to the measuring results were the biggest.The results showed that 95% of the testing error was within 7.6%, the biggest testing error was about 110 W, and the precision of the test facility met the testing requirement.

Based on the theory of heat and mass transfer between the moist air and the desiccant solution, the heat and mass transfer model of cross-flow liquid regenerator is developed.The mathematical models include the mass and energy conservation equation of gas and liquid.According to the method of computation, the equations are simulated with Matlab software.The research shows that the model is credible by comparing the result of simulation and experiment.

Building cooling, heating and power (BCHP)system is a highly efficient energy use patterns, which can provide electricity, cooling and heating.A distributed control system is used due to complication of the BCHP system involving different equipments, different seasons and different users.In this paper, a distributed control system based on programmable logical controller (PLC)and supervising computer is developed.It makes the whole system run automatically in different season work.Its control hardware and software are introduced and its control strategy is analyzed.

Integrated process technologies, including pinch analysis (PA)and exergy analysis, are applied to analyze a micro distributed combined cooling heating and power (CCHP)system.Based on typical operation performance of this dwelling CCHP application, retrofit of the heat exchanger network (HEN)is made by optimization design of PA.With further combination of PA and exergy analysis, the cascade in CCHP system is demonstrated.Combined with thermodynamic characteristics of heat machine and heat pump, their placement in HEN is clarified.These optimization principles direct the retrofit of the micro distributed CCHP system, which results in the achievement of both energy utilization and economical targets.

The features of rough set theory in data extraction are analyzed.Rough set theory is applied to historical records of operating parameters of an industrial refrigerating plant.From a set of nine recorded parameters, the number of relevant factors affecting the energy consumption of refrigerating compressors is reduced to just four by applying rough set theory to filter recorded data.This reduction of parameters allows the study of energy consumption of refrigerating compressors to be simplified and an experimental formula relating electrical current to dry bulb temperature to be determined.The results show that rough set theory can be used to analyze the operating parameters of refrigerating plants and the potential rules of the data set can be extracted.

Because of the deficiencies of evaporative cooling air conditioning system and the shortage of displacement ventilation，the combining system of evaporative cooling and displacement ventilation is pointed，and the integration mechanism and virtue of the combining system were analyzed.The actual field tests of the Xinjiang University Gymnasium were carried out.For the coliseum’s air-conditioning system of evaporative cooling and displacement ventilation，the measured data indicated that two-stage evaporation cooling air processing unit achieved the designed requirements.The change of the temperature of vertical gradient and the relations that the temperature of vertical gradient changed with supply speed were analyzed.Air supply speed of 0.4—0.5 m•s^-1 was suggested when the combining system of evaporative cooling and displacement ventilation was applied to the similar building tested.

A solar-powered adsorption cooling system was designed.The system can realize both open-type circulation mode and closed circulation mode by switching the pipeline.The operation performance under two different circulation modes was studied，which includes temperature variations of solar collector arrays and adsorption chillers as well as refrigerating output variations of the system.From the experiments，it was shown that open-type system operated stably because of regulating effect by heat storage water tank.However，obvious wave characters could be observed in the operation of closed system.Besides，closed system has the advantages of higher solar collecting efficiency as well as higher COP，which leads to evident energy conservation.

A thermochemical sorption deep-freezing system using manganese chloride-ammonia as sorption working pair was designed.For this test unit，expanded graphite was used as the porous medium of the reactant to improve the mass transfer inside the composite sorbent，and the consolidation technology was utilized to enhance the heat transfer performance.Experimental results showed that the additives of expanded graphite can avoid the agglomeration and the attenuation of sorption capacity.The consolidated composite sorbent could uptake 0.47 kg NH₃•（kg salt）^-1.The chemical reaction between the composite sorbent and the refrigerant has a strong influence on the temperature evolution inside the reactor，and the sorption platforms were dissimilar at different evaporation temperatures.The lower the evaporation temperature，the lower the reactive rate.The specific cooling power（SCP）varied between 206 W•kg^-1 and 706 W•kg^-1 when the evaporation temperature ranged from-35℃ to 0℃.For the thermochemical sorption deep-freezing system，SCP and coefficient of performance（COP）obtained with the consolidated composite sorbent were as high as 350 W•kg^-1 and 0.34 respectively，at the cooling water temperature of 25℃ and the evaporation temperature of -30℃.

In this paper，a thermoeconomic cost model and characteristic equations based on the adequate fuel-product concept of structural theory are constructed for a gas-fired micro-trigeneration system，which uses a small-scale generator set driven by a gas engine and an adsorption chiller.By solving the characteristic equations，the thermoeconomic costs of power，cooling and heating are evaluated according to the experimental data.The analysis indicates that the price of natural gas and the initial investment of adsorption chiller are the main factors in determining the thermoeconomic costs of the micro-trigeneration system.

A scheme for refrigerant direct-contact seawater desalination utilizing LNG cold energy is presented in this paper.On one hand，it can achieve seawater crystallization to produce freshwater continuously.On the other hand，because of making full use of LNG cold energy，the system could avoid the need for electricity-driving refrigerator and save energy，satisfying the requirements of energy-saving and ejection-decreasing.The process of seawater desalination system，the choice of middle refrigerant and the determination of main process parameters are discussed.The size of the crystallizer is estimated with volume heat transfer coefficient and evaporation height.The inlet and outlet parameters of the pre-cooling heat exchanger are also discussed.The system process simulation results show that this kind of seawater desalination process is an efficient and feasible one.

Air-cooled absorber and condenser is one of the most significant methods to reduce the bulk volume of absorption refrigeration system and to extend its range of application.In this paper，lumped parameter model for four double-effect air-cooled lithium bromide absorption refrigeration cycles was developed to analyze effects of varying heat reservoir temperature，cooling air temperature and evaporation temperature on system performance.The simulated result indicated that increased temperature of heat reservoir is essential to the air-cooled absorption system，and coefficient of performance of the cycle with parallel solution flow in which solution flow is distributed prior to low temperature solution heat exchanger is much lower than that of the other three cycles，thereby is unfit for absorber and condenser to be air cooled.

The utilization of energy resources presents that the current energy structure doesn’t match with the economical situation that is low energy efficiency.Specially，there is a huge potential of energy-saving in the field of construction in China.Energy Management Company（EMC）is introduced in this paper. The EMC provides a new approach for building energy-saving in China.Most of the EMCS are independent companies that take charge of the evaluation，design and construction of a building subject to make sure the energy-saving.The energy savings performance contract（ESPC）is adopted by the EMC as a manner to perform the assignment.By carrying out the approach，many building enterprises can enjoy the benefits of energy-saving without the investment in advance.The EMC provides the overall services for these enterprises which need energy-saving.But there are still some problems in the practice such as the distempered code，the non-standard market system，the immature management regulation and so on.At present，the development of EMC is incomplete and needs the government supporting and the relative corporations working together to contribute the energy-saving for construction filed.

The experimental investigation of the thermal stratification of a single buoyancy source in the natural displacement ventilated room was reported.The bubble plume model was adopted to simulate the thermal stratification in this project.The varied relationships between the effective ventilated area and the height of the thermal stratification have been discussed.The testing data obtained from the analysis of the INSIGHT 3G software were compared with the calculated results of the mathematical model and it was found that the non-dimensional height of the thermal stratification increased with increasing non-dimensional effective ventilated area within the natural displacement ventilated room driven by a single point heat source.The height of the thermal stratification of the single point heat source is the function of the non-dimensional effective ventilated area.

A novel photovoltaic/thermal integrated heat pump（PV/T-HP）system was developed for electricity generation and domestic hot water heating.PV modules were directly laminated on the surface of solar thermal collector，to the back of which evaporator tubes was adhered.Two different structures of PV/T-evaporators applying conventional copper tube and multi-port flat extruded tube were designed and investigated.Comparative analyzes on their characteristics indicated that the latter structure obtained a better performance，achieving a higher COP by 6%，and a higher power output by 2%.Using the meteorological data in Nanjing，China，the simulation results based on 150 L water heating load showed that such a PV/T-HP could generate electricity efficiently at the same time produced hot water with a COP ranged from 4.23 to 5.54 all year around.Moreover，an optimizing controlling principle was proposed to achieve a better overall performance.

There is worldwide plea to reduce carbon dioxide emission.In response to such a call，several governments in the East Asia recently required to adopt higher room temperatures in summer.To promote such an idea，the public need to be convinced that such practice would not sacrifice indoor environmental quality，especially thermal comfort of the occupants.To implement such a measure，suitable ventilation system（s）to work under the unconventional conditions should be identified.Stratum ventilation is introduced to demonstrate its feasibility in coping for the higher room temperatures.A case study，a typical office in Hong Kong，is used to illustrate the performance of this new ventilation mode.Experimental and computational results show that with properly designed supplied air velocity and volume，locations of supply and exhaust，the proposed system has the potential to maintain better thermal comfort with a smaller temperature difference between the head and foot level，lower energy consumption，and better indoor air quality（IAQ）in the breathing zone.Much further work is needed to determine if the benefits are significant.

An energy saving project for the LNG-CCHP system in Xiamen natural gas power plant is put forward according to the basic data of this power plant.The system primary energy ratio，operation economics and energy saving potential are analyzed and calculated under some assumptions.The results show that the system total energy efficiency of this project is higher than 80%，with the energy efficiency of cooling-power system and heating-power system up to 89.2% and 82.8% respectively.Moreover，the operation costs for cooling system are fewer and the investment recovery period is less than 5 years.Therefore，the proposed LNG-CCHP system has great economic benefits and energy saving potentialities.

Under the theoretical analysis and thermal computation of various refrigerants of jet refrigerator powered by potential heat energy，the paper found out the most suitable ranges of various refrigerants and selected R600a as the comparatively ideal refrigerating substance.