Ejector Heat Exchanger Research Articles

Screening refrigerant for a new enhanced ejector heat exchanger used in district heating system based on industrial waste heat

Performance of the new enhanced ejector heat exchanger is the key to improving performance of the district heating system based on industrial waste heat, and it is significantly affected by thermo-physical property of refrigerant. In this paper, characteristics of the new enhanced ejector heat exchanger are considered, and a new principle for screening refrigerant is proposed. Eleven kinds of refrigerants are firstly selected as candidates, and then they are evaluated from the perspective of property and thermodynamic performance of the new enhanced ejector heat exchanger. The results show that refrigerant property has a greater influence on thermodynamic performance of the new enhanced ejector heat exchanger. Under the condition of low temperature space heating, R152a and R1234yf are favorable choices for the new enhanced ejector heat exchanger. While under conditions of other temperature space heating, R245fa and R600 are better choices for the new enhanced ejector heat exchanger.

Configuration optimization of an enhanced ejector heat exchanger based on an ejector refrigerator and a plate heat exchanger

Ejector heat exchanger has good performance in heat transfer, but its regulating characteristics are poor, and to improve its regulating characteristics, an enhanced ejector heat exchanger (EHE) with a pressure booster is presented. According to the difference in location of the pressure booster, the enhanced ejector heat exchangers are divided into two types. One is EHE-MF with its pressure booster located in the pipeline between outlet of ejector and refrigerant inlet of the condenser. The other is EHE-SF with its pressure booster located in the pipeline between secondary fluid inlet of ejector and refrigerant outlet of the evaporator. The two enhanced ejector heat exchangers have been analyzed from the perspective of thermodynamics. The results show that the location of pressure booster in the pipeline between outlet of ejector and refrigerant inlet of the condenser contributes to decreasing boosted pressure and power and increasing product exergy efficiency. The EHE-MF has higher thermodynamic performance, and its system configuration is optimal from the perspective of thermodynamics.

ANTICIPATED COSTEFFECTIVE EFFECT FROM APPLICATION OF THE EJECTOR HEAT EXCHANGER FOR CONDENSATION OF LIGHT FRACTION HYDROCARBON ON THE PETROLEUM STORAGE DEPOT

Loss control of oil products is the one of the relevant paths of saving of the fuel and energy resources play a crucial role in development of economics. Now a great many of different procedures of a choice of means of reduction of oil losses and petrol from evaporation are known. However the one part from them did not allow for value of these means and expenditures for them maintenance, another – did not allow for diversity of implementation of means of reduction of losses, third – uses outdated, now, the criterion. In the conditions of petroleum storage depots, as a rule, usage of ejector systems of trapping of light fraction are more preferential, than other hardware’s of reduction of losses. The positive effect from application of an ejector heat exchanger for preventing of losses of petroleum products are calculate.

ЖИТТЄВИЙ ЦИКЛ СИСТЕМИ УЛОВЛЮВАННЯ ЛЕГКИХ ФРАКЦІЙ ВУГЛЕВОДНІВ НА БАЗІ ЕЖЕКТОРНОГО ТЕПЛООБМІННИКА

In a paper the mode and a procedure of accounts of lifecycle for systems of catching of light fractions of a hydrocarbon on the basis of an ejector heat exchangers are reduce. Thinness of accounts for different systems that it is necessary to allow at projection of devices is display. The introduced procedure of lifecycle allowed evaluating qualitatively a plant at projection and maintenance.

Use of ejector heat exchangers in different areas of the industry

The article presents the ejector type heat exchangers, which are encouraged to use the following issues: reduction of suction vapor high temperature into the high stage compressor, reduce the heat of condensation in ammonia plants at peak loads, the condensation of hydrocarbon vapors to reduce the emission of low-boiling fractions of liquid hydrocarbons, flue gas cleaning, shrinkage product reduction during freezing, product icing. Intercooler on the thermal pressor base was introduced at the Kharkov Meat-Packing plant, and manufacturing refrigerators of Ukraine and Kazakhstan.The thermal condenser-ejector has been designed, assembled, and successfully launched in the workflow on defense department Repairs Plant number 46 in Odessa. Was also designed and tested The ejector-air humidifier in heat treatment chamber at the V. S. Martynovsky Institute of the refrigeration, cryotechnology and ecoenergetics of Odessa National Academy of Food Technologies has been also designed and tested.The authors are exploring the use of ejector heat exchangers in closed and semi-closed systems, because these studies are relevant and vital to the industry to achieve more effective results because of all the existing methods to prevent from harmful substances entering into the atmosphere and maintaining a high level of environmental safety are not very effective in comparison with the authors’ methods.The obtained results of the research prove the following hypothesis of ejector heat exchangers usage: complete condensation of flue gas in cleaning systems; environmental safety improving of flue gas emissions; metal content reduction in industrial refrigeration. Through the ejector heat exchangers usage may solve the problem of zonal air cooling in extreme environmental conditions.

A new waste heat district heating system with combined heat and power (CHP) based on ejector heat exchangers and absorption heat pumps

A new waste heat district heating system with CHP based on ejector heat exchangers and absorption heat pumps (DH-EHE) is presented to decrease heating energy consumption of existing CHP systems by recovering waste heat of exhausted steam from a steam turbine, which could also increase heat transmission capacity of the primary heating network (PHN) by decreasing temperature of the return water of existing PHN. A new ejector heat exchanger based on ejector refrigeration cycle is invented to decrease temperature of the return water of PHN to 30 °C under the designed case. DH-EHE is analyzed in terms of laws of thermodynamics and economics. Compared to conventional district heating systems with CHP (CDH), DH-EHE can decrease consumption of steam extracted from a steam turbine by 41.4% and increase heat transmission capacity of the existing PHN by 66.7% without changing the flow rate of circulating water. The heating cost of DH-EHE is 8.62 ¥/GJ less than that of CDH. Compared to CDH, the recovery period of additional investment of DH-EHE is about two years. DH-EHE shows better economic and environmental benefits, which is promising for both district heating systems for long-distance heat transmission and waste heat district heating systems.

A new ejector heat exchanger based on an ejector heat pump and a water-to-water heat exchanger

As urban construction has been developing rapidly in China, urban heating load has been increasing continually. Heating capacity of the existed primary heating network (PHN) cannot meet district heating requirements of most metropolises in northern China. A new type of ejector heat exchanger (EHE) based on an ejector heat pump and a water-to-water heat exchanger (WWHE) was presented to increase the heating capacity of the existed PHN, and the EHE was also analyzed in terms of laws of thermodynamics. A new parameter, the exergy distribution ratio (EDR), is introduced, which is adopted to analyze regulation characteristics of the EHE. We find that the EHE shows better performance when EDR ranges from 44% to 63%. EHE can decrease the temperature of return water in the PHN to 35°C, therefore, this can increase the heating capacity of existed PHN by about 43%. The return water with lower temperature in the PHN could recover more low-grade waste heat in industrial systems. Because of its smaller volume and lower investment, EHEs could be applied more appropriately in district heating systems for long-distance heating and waste heat district heating systems.

Integral mathematical model of magnetic fluid ejector

On the basis of the ideal fluid approach the magnetic fluid ejector, the main part of ejector heat exchanger, was considered. Mathematical model of the ejector was build with the aid of integral laws of mass and momentum conservation. The conditions under which the magnetic fluid ejector is able to function were determined