摘要:Liquefaction provides an efficient approach for better recovery and utilization of CBM(coal bed methane).For CBM with low methane content,methane enrichment has to be considered along with liquefaction,so the liquefaction technology is different from that for the ordinary natural gas.There are mainly two solutions for the liquefaction of CBM with low methane content: one is liquefaction at first and then concentrate methane via a distillation process;the other one is adopting an adsorption process firstly t...
关键词:pyrology;Coal bed methane(CBM);liquefaction;Process;adsorption;distillation;heat transfer
摘要:VRV Ground Source Heat Pump is a new energy-saving technology combining Varied Refrigerant Volume with Ground-source Heat Pump.An office building is selected as representative building,and VRV-GSHP system is compared by other three traditional air conditioning systems.Bin Method is used to simulate energy consumption of the building.According the energy price of Shanghai and the comparison between VRV-GSHP system and other system in primary energy consumption,initial cost,operation cost and annual expenses,...
摘要:A series of experiments on the dynamic performance of the heat pump water heater(HPWH) unit with electronic expansion valve(EEV) under different environmental conditions were conducted.The dynamic heating capacity and coefficient of performance(COP) of the HPWH unit under different EEV openings were measured.The effects of the EEV opening on the performance of the HPWH unit were analyzed.Meanwhile,the dynamic performance of the HPWH with EEV was simulated and the results were compared with the experimental ...
关键词:pyrology;heat pump water heater;electronic expansion valve;dynamic performance;experimental investigation
摘要:The research presents a solar-assisted air-conditioner with water heater in which solar water heater and heat pump air-conditioner are combined.The performance of heat pump in the new system is experimentally investigated.The performance of heat pump working at 3 modes under standard condition is measured.The results show that,the COP is 5.34,5.78 and 4.5 at cooling mode,heating mode,and cooling-heating mode,respectively,which indicates that the new system is more effective than traditional systems.
摘要:By the establishment of a mathematical model on a solar-powered air-cooled two-stage ejector refrigeration system using ammonia as refrigerant,the performance of ejector refrigeration system with rated refrigeration capacity of 9.4kW for cold store was analyzed.The refrigeration capacity of the proposed system increases with the rising of cold storage temperature and the enhancement of solar irradiance,while decreases with the rising of ambient temperature.The COP has similar changing trend with that of the...
摘要:In order to solve the load balance of hot water and air-conditioning in multi-function heat pump under air-conditioning and water heating mode,it is necessary to regulate the energy exchange between hot water heat exchanger and air-conditioning heat exchanger according to the load changing of air-conditioning or hot water.At first,several kinds of current adjusting methods of energy is analyzed,and a new variable flow regulating mode is proposed based on the advantages and disadvantages of current methods.T...
关键词:pyrology;Multi-function heat pump;Air-conditioning and water heating model;Load regulation;variable flow
摘要:Due to its advantage of high-efficiency and energy-savings,evaporative cooler has been widely used in refrigeration and other industrial areas.The heat transfer process includes mass diffusion and gas-liquid two-phase flow,many factors will influence the cooling performance.A comprehensive performance test of evaporative cooler has been done to analyze the influence of these factors.Experimental results show that increasing the flow rate of air and sprayed water can improve the efficiency of cooling.For the...
摘要:Display cabinet is important user oriented equipment in supermarkets and retail terminals.In this paper,one new type product was developed using frozen water instead of refrigerating fluid which combined central refrigeration and ice storage technology named as Ice Slurry Vertical Open Display Cabinet with Central Refrigeration.The new product benefits from ice storage technology,and meanwhile,completely eradicates condensing heat exhaust into room and frosting and defrosting.As a result,the power consumpti...
关键词:pyrology;Dynamic ice storage;refrigerated display cabinet;temperature distribution
摘要:The effect factors that influence the leakage characteristics of HFC-161/125/32,a new alternative refrigerant for HCFC-22,were discussed.Corresponding leakage models were built and the mass ratio variations of each component under gas phase isothermal leakage and gas phase isobaric leakage cases were studied.Based on the obtained mass ratio variation data,cycle performance variations of the mixture were deduced.As the mass ratio variations under gas phase isobaric leakage cases are smaller than that of isot...
摘要:As the promotion and the application of NH3/CO2 cascade refrigeration system,the development of efficient cascade heat exchanger becomes more and more important to improve the performance of the system.Based on the experimental study of a NH3/ CO2 cascade refrigeration system,and the analysis of the effect caused by operating condition and the number of heat exchanger tubes on the temperature difference of heat transfer,heat flux and coefficient of heat transfer,we conclude that the heat transfer coefficien...
关键词:engineering thermophysics;NH3/CO2 cascade refrigeration;Cascade heat exchanger;heat transfer coefficient;experimental study