EVALUATION METHOD, EVALUATION DEVICE AND EVALUATION PROGRAM OF HEAT EXCHANGER CORE FOR AIR CONDITIONING

• Main Authors: TANIGUCHI KENICHI, USUI NAOTO
• Format: Patent
• Language: English; Japanese
• Published: 01.11.2021
• Subjects: BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT EXCHANGE IN GENERAL; HEAT PUMP SYSTEMS; HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; REFRIGERATION MACHINES, PLANTS OR SYSTEMS; REFRIGERATION OR COOLING; WEAPONS

To provide a technology for calculation estimation of temperature changes and pressure losses of refrigerant and passing air from the shape of heat exchanger core for air conditioning and test conditions.SOLUTION: The present invention is a method for evaluating the performance of a heat exchanger core for air conditioning, which is provided with a plurality of fins and tubes, and air is circulated between the fins and the tubes to exchange heat between the medium and the fins. An air pressure loss and an average heat transfer rate are obtained. Under an assumption that a fin temperature distribution has a uniform average temperature, a fin temperature distribution is obtained from fin efficiency, fin root temperature, and outside air temperature. The temperature of the air is obtained by the difference method for each of divided regions of the fin in the air flow direction under a recognition that the tubes are one straight tube. Under an assumption that a relational expression that air wind speed×total fin area×input/output air temperature difference×specific heat=amount of medium×specific heat×input/output air temperature difference is reasonable, the amount of medium is obtained by solving the relational expression, and the air outlet temperature and the water outlet temperature are obtained.SELECTED DRAWING: Figure 1 【課題】本発明は空調用熱交換器コアの形状や試験条件から、冷媒、通過空気の温度変化および圧力損失を計算で見積もる技術の提供を目的とする。【解決手段】本発明は、複数のフィンとチューブを備え、フィンとチューブの間に空気を流通させてチューブ内の媒体とフィンとの間で熱交換を行う空調用熱交換器コアの性能評価方法であって、空気の圧力損失と平均熱伝達率を求め、フィンの温度分布が一様な平均温度を有すると仮定し、フィン効率とフィン根元温度と外気温度からフィンの温度分布を求め、フィンを空気の流れ方向に分割して領域毎に差分法によって空気の温度を求め、チューブを１本の直管と見立ててチューブの分割領域毎に媒体の温度を求め、空気の風速×フィン総面積×入出空気温度差×比熱＝媒体の量×比熱×入出水温度差の関係式が成立すると仮定し、関係式を解いて媒体の量を求め、空気出口温度と、水出口温度を求める。【選択図】図１