Abstract
In this research, an ejector was designed and manufactured from brass metal as part of a cooling system to cool agricultural products, work of ejector is based on the Venturi principle. The primary fluid is air and steam of product is the secondary fluid, used the primary pressure (1, 8, 1) bar for the purpose of conducting the experiment. The ejector was manufactured from a number of interconnected parts to give the final shape. The performance of the ejector was analyzed theoretically, through operating of system evaporation of water take place in vessel leads to cooling product at change operation condition and the examination, it was reached: a- The cooling efficiency of the product increases by increasing the primary pressure. b- The cooling efficiency of the product increases by decreasing the mass of the product. c- The loss weight of the product increases by increasing the primary pressure.
Highlights
IntroductionThe serum sent to Europe from the United States for medical treatment of a wounded person needed to be frozen, but due to the lack of immediate refrigeration and transportation, many of the blood serum supplies were spoiled before reaching the target recipient These applications include food processing and pharmaceutical[2] Temperature is considered one of the most important environmental factors for crop deterioration, and optimal temperature control is considered the most important tool to prevent crop deterioration and maintain its quality
Section chamber Mixing section Diffuser The ejector operating principle can be summarized as follows: A fluid with high pressure and high temperature enters the primary nozzle and is called the primary fluid. This fluid expands through the primary nozzle so that it leaves at a high speed and low pressure, which leads to the withdrawal of another fluid from an opening in the intake chamber and is called the secondary fluid
We examined the air compressor operation steady by using three different pressure of the nozzles (2, 1.8, and 1) bar and it was noticed that the compressor with capacity of 25 liters was steady state at a pressure of 1.8 bar, and on this basis, this diameter was relied upon by the design of the ejector
Summary
The serum sent to Europe from the United States for medical treatment of a wounded person needed to be frozen, but due to the lack of immediate refrigeration and transportation, many of the blood serum supplies were spoiled before reaching the target recipient These applications include food processing and pharmaceutical[2] Temperature is considered one of the most important environmental factors for crop deterioration, and optimal temperature control is considered the most important tool to prevent crop deterioration and maintain its quality Cooling in this way is called initial cooling that allows heat to be removed from the product after it is collected before the shipping and marketing process. The vacuum cooling method is based on the evaporation of water from the product at a low temperature, evaporation of water leads to cooling, because the energy needed to convert water from liquid to gas is taken from the product, which leads to its cooling
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