Countercurrent exchange

About: Countercurrent exchange is a research topic. Over the lifetime, 2255 publications have been published within this topic receiving 28687 citations. The topic is also known as: Countercurrent exchange.

Structure and shape of indirect vaporization type cooler

Abstract: PROBLEM TO BE SOLVED: To provide an indirect vaporization cooler minimizing pressure loss and transmitting cooling heat generated in a wet channel to air to be cooled passing through a dry channel at maximum heat exchange efficiency SOLUTION: The wet channel for causing a vaporization phenomenon and the dry channel passing the air to be cooled are alternately arranged, heat exchange is carried out by a countercurrent, plastic is used as a material forming the channels, woven fabric or nonwoven fabric is adhered together for wetting the plastic with water, and water is retained in a wetting film COPYRIGHT: (C)2009,JPO&INPIT

Liquid air energy storage system

Abstract: The utility model relates to the technical field of renewable energy sources, in particular to a liquid air energy storage system. In the liquid air energy storage system, a medium heat exchange sideof an air cooler of a cold accumulation unit and a medium heat exchange side of an air heater are connected to form cold accumulation medium circulation, and the air heat exchange side of the air cooler and the air heat exchange side of the air heater are sequentially connected between an air pressurization unit and an energy release unit; a countercurrent heat exchange channel is arranged in theair cooler, and the expansion machine is connected between the air heat exchange side of the air cooler and the countercurrent heat exchange channel. According to the liquid air energy storage system,the problems that in an existing liquid air energy storage system, cold energy leakage exists in the energy storage process, the energy release process and the intermittent period of the cold storageunit can be solved, the cold energy can be supplemented for the cold storage unit, and the influence of cold leakage on the cold storage performance is eliminated; and the overall energy storage efficiency of the system can be ensured to be maintained at a higher level efficiently and economically.

A modified continuous countercurrent flow model for a PSA separation process

Abstract: The continuous countercurrent flow (CCF) model for pressure swing adsorption (PSA) systems has so far been validated for Skarstrom cycle in which the pressurization and blowdown steps and adsorption and purge steps have equal durations. The mass balance was written in such a way that the total volumes of feed and purge were kept constant between the actual operation and the steady state CCF representation. By relaxing this restriction on the mass balance, it is shown that the usefulness of the CCF model may be extended to cycles in which the durations of the individual steps are different

Numerical analysis of heat transfer in countercurrent blood flow and biological tissue

Abstract: Bioheat transfer in biological tissue is described by the Pennes equation, while the change of blood temperature along the artery an d vein is described by ordinary differential equations, at the same time the counte rcurrent blood flow is taken into account. The coupling of these equations results from the bo undary conditions given by the blood vessel walls. There are two methods used here in or der to calculate the temperatures along the blood vessels and across biological tissue. To solve the Pennes equation, the Multiple Reciprocity Boundary Element Method (MRBEM) is appl ied. It should be pointed out that this method does not require discretisation of the int rior of the domain. The second method used in this paper is the Finite Difference Method (FDM) and it is applied to calculate the temperatures along the blood vessels, and it comple ments the previous one. It is important to note that the diameter of an artery is smaller t han of a vein, which results from the physiological characteristics of these blood vessel s. In the final part of the paper, the results of the computations are shown and conclusions are f ormulated. 1. Governing equations Biological tissue is heated by a pair of blood vess els located at the central part of the tissue cylinder, as shown in Figure 1. Fig. 1. Pair of blood vessels (Krogh-type tissue cy linder) Γ Γ Γ