Abstract
AbstractBasic structures of liquid-vapor separation cooling plates (LSCPs) and a liquid-vapor separation plate condenser (LVSPC) are innovatively designed. Strengthening heat transfer principle of the LSCPs is demonstrated by theoretical analysis. The average condensation heat transfer coefficients (ACHTCs) of the LSCPs are calculated and compared with conventional cooling plate (CCP). Results show that for a laminar flow, the ACHTCs of 2-parts liquid-vapor separation cooling plate and 3-parts liquid-vapor separation cooling plate are respectively 19% and 32% higher than the ACHTCs of the CCP in the same conditions. The ACHTC ratio of N-parts liquid-vapor separation cooling plates (NLSCP) to CCP is $\sqrt[4]{N}$in the same conditions. For a turbulent flow, results show the smaller the height of condensation area, the greater the ACHTCs of cooling plate. In the LVSPC study, operation conditions include the refrigerant R134a mass flux ranging from 22 to 32 kg/(m2.s) and inlet vapor quality from 0.5 to 1 for the saturated temperature of 40∘C. Calculation results showed that the ACHTCs of the LVSPC are 6–24% higher than the ACHTCs of the given common plate condenser (CPC), and similar to the CPC, the ACHTCs of the LVSPC increases with the increase of mass flux and vapor quality.
Highlights
Condensers are widely used in many industries, such as petroleum, chemical, electric power, refrigeration, air conditioning and so on
Results show that for a laminar flow, the average condensation heat transfer coefficients (ACHTCs) of 2-parts liquid-vapor separation cooling plate and 3-parts liquid-vapor separation cooling plate are respectively 19% and 32% higher than the ACHTCs of the conventional cooling plate (CCP) in the same conditions
Calculation results showed that the ACHTCs of the liquid-vapor separation plate condenser (LVSPC) are 6–24% higher than the ACHTCs of the given common plate condenser (CPC), and similar to the CPC, the ACHTCs of the LVSPC increases with the increase of mass flux and vapor quality
Summary
Condensers are widely used in many industries, such as petroleum, chemical, electric power, refrigeration, air conditioning and so on. Current studies on the liquid-vapor separation condensation mainly include mechanism research of enhanced heat transfer, optimal design of condenser structure and improvement of system performance. Some research results validated the high performance of an air-conditioning system with a liquid-vapor separation condenser. Zhong et al [10] first applied the design principle of liquid-vapor separation condensation to the microchannel multi pass parallel flow condenser, and experimentally studied the influence of the partition in the header on the performance of the heat exchanger. Experimental results show that when the refrigerant flow rate is greater than 590kg·m−2·s−1 or the average dryness is higher than 0.57, the average heat transfer coefficient of the new microchannel condenser with liquid-vapor separation structure is improved by nearly 4%, and the pressure drop is only 48.6% - 69.5% of that of the conventional microchannel condenser. An attempt is made to investigate heat transfer enhancement in liquid-vapor separation plate condensers by theoretical calculations and comparison
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