Study of Pressure Drop of Refrigerant Mixtures During Boiling Inside Enhanced Surface Tubing Under Magnetic Field
3
Citation
5
Reference
10
Related Paper
Citation Trend
Abstract:
Two phase flow pressure drop characteristics observed under magnetic field during boiling of refrigerant mixtures R-404A, and R407C as well as R-507 are presented in this paper. Experiments showed that magnetic field has insignificant effect on the pressure drop. It was evident from the boiling data that the magnetic field has insignificant impact on the pressure drop. Boiling data showed was found to be correlated with a mean deviation between of ±20%.Keywords:
Boiling point
Propane (HC-290) is one of hydrocarbons often called as a green refrigerant. As a result, in the long term, this refrigerant is able to be used as a substitute refrigerant to HCFC-22. Generally, the amount of charging HC-290 to replace HCFC-22 based on the density ratio of the refrigerants, for instance, the ratio of liquid density at-10°C between HCFC-22 and HC-290 is 40.59%. Also, most investigations reported that the refrigeration system performances of HC-290 were better compared to HCFC-22 without varying the refrigerant charging of HC-290. By varying the refrigerant charging of HC-290 in a freezer, the performances can be optimized. This study presents an experimental investigation of the impacts on the performances of a freezer when the refrigerant charging of HC-290 is varied replacing HCFC-22. Three performances are reported in the present study, namely: cooling capacity, input power and COP. The first experiment was performed on a freezer using HCFC-22 as working fluid and the amount of refrigerant charging was 450 gram. Furthermore, the tests were carried out using HC-290 with six charging conditions: viz.: 30, 35, 40, 45, 50 and 55% of the mass of HCFC-22. The results showed that when refrigerant of HC-290 was charged 45% (mass) of HCFC-22, the freezer yielded the biggest increase in the cooling capacity and COP.
Cooling capacity
Propane
Global-warming potential
Cite
Citations (1)
Introduction . —In the course of some work, communicated to the Royal Societ by one of us, in which determinations of the boiling points of some saturated solutions were made by Buchanan’s method (the so-called Landsberger-Sakurai method), it was pointed out that these boiling points probably varied according to the height of liquid operated upon. During the course of that research a few experiments, which, however, are not recorded in the paper, were made on the boiling point of water; and it was found that this boiling point was approximately that due to a head of water equal to half the total height of liquid. The paper cited mentioned the hope that direct osmotic pressure measurements might be obtained; this hope has not been fulfilled, but as an exact connection between the vapour-pressure and the osmotic pressure of a solution has since been worked out, a knowledge of the boiling points will enable the osmotic pressure to be calculated.
Boiling point
Osmotic pressure
Liquid water
Cite
Citations (3)
Halocarbon
Cite
Citations (86)
Dimethyl ether(DME)can be used as refrigerant because it has a property to liquefy easily at roomtemperature,0.53MPa. In this report, using DME as a refrigerant is numerically evaluated by a comparisoncoefficient of performance(COP)at standard refrigeration cycle and single or double stage compressionrefrigeration cycle at-30℃ between a DME refrigerant and conventional refrigerants. The results showedthat the DME refrigerant is superior as compared with conventional refrigerant in term of COP at standardrefrigeration cycle.
Dimethyl ether
Cite
Citations (0)
Boiling point
Cite
Citations (6)
Boiling point
Cite
Citations (5)
A new method is proposed to estimate the heat of vaporization of pure liquid at its normal boiling temperature. The properties required include the boiling temperature, critical temperature and critical pressure. For monohydric alcohol and monohydric organic acid, an adjusting-boiling-temperature strategy is proposed to reduce the calculation errors. The method is tested for 160 substances including many groups of compounds. The results show that the proposed method is better than the literature methods, especially for monohydric alcohol and monohydric acid.
Vaporization
Boiling point
Cite
Citations (29)
It has been found that CFCs can lead to ozone depletion and global warming when they are released into the air. In order to protect the ozone layer, the use of the traditional refrigerant has been forbidden gradually, and the research on the substitution of new refrigerants is carried out urgently in the world. In this paper,the substitution principle is introduced,and the research situation of new refrigerants at home and abroad is also described. The application of ammonia refrigerant is discussed in detail,and the developing direction of refrigerant also discussed.
Global-warming potential
Substitution (logic)
Ozone Depletion
Cite
Citations (0)
In domestic air conditioning system the most widely used refrigerant is R22 has a high Global Warming Potential (GWP) of 1700 and a ozone depletion potential (ODP) of 0.05. Hence a new solution for this refrigerant is to be identified. R152a is identified as an alternative to R12 and R22 refrigerants. In this paper an experimental investigation was made to reduce the usage of R22 with the Hydrocarbon Refrigerant mixtures (HCM) of R22 and R152a refrigerants in the ratio of 30:70, 50:50, and 70:30 by mass. Experiments were conducted by continuous running tests under an ambient temperature of 32°C. The overall performance of the system proved that the HCM could be a long term substitute for R22 (chlorodifluoromethane).
Global-warming potential
Cite
Citations (0)
Summary Boiling points of fruit juices affect the design and operation of juice evaporators. Hence boiling points of pineapple, mango and lemon juices were experimentally determined at solid concentrations of 5 to 45% and vacua of 0 to 70 cm Hg. As expected, boiling points increased as concentration increased. Duhring's plots are also presented. For the same concentration range, mango juice has the highest boiling point elevations followed by pineapple and lemon juices in that order.
Boiling point
Fruit juice
Lemon juice
Cite
Citations (18)