Abstract

The demands of specific requirements related to thermal comforts, such as temperature, relative humidity, inside air exchange and other factors required in a hospital operating rooms, have necessitated the development of energy-efficient heating, ventilation and air conditioning (HVAC) systems and efficient heat-recovery system using a heat-pipe heat exchanger (HPHE). The experiment was conducted by using HPHEs having three, six and nine rows, with four heat pipes in each row, arranged in a staggered configuration with a variation of fresh-air inlet temperature and velocity. The theoretical analysis was conducted using the ε-NTU method for predicting the effectiveness, outlet temperature of the evaporator side and energy recovery of the HPHE. The experimental results indicated that increasing the air-inlet temperature in the evaporator section and the number of rows increased the HPHE effectiveness but increasing the air-inlet velocity reduced the effectiveness. The highest effectiveness of 62.6% was obtained at an air-inlet temperature of 45°C with an air-inlet velocity of 2 m/s and a 9-row HPHE. The energy recovery of the HPHE increased with the number of rows, air-inlet temperature and air velocity in the evaporator section. The ε-NTU method can be used as a comparison method in the analysis of heat-recovery systems that apply HPHE air conditioning systems. Heat pipes that utilize cold-air exhaust from a room in an HVAC system can enhance efficiency and reduce emissions.

中文翻译：

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多级热管换热器，用于提高医院手术室HVAC系统的能源效率1

摘要

与热舒适性相关的特定要求的需求，例如温度，相对湿度，内部空气交换以及医院手术室中需要的其他因素，已经需要开发高效节能的供暖，通风和空调（HVAC）系统，使用热管热交换器（HPHE）的热回收系统。通过使用具有三排，六排和九排，每排四根热管的HPHE进行实验，每根热管以交错结构布置，并且新鲜空气的入口温度和速度有所变化。使用ε-NTU方法进行理论分析，以预测效率，蒸发器侧的出口温度和HPHE的能量回收。实验结果表明，增加蒸发器部分的进气温度和行数可以提高HPHE效率，但是增加进气速度会降低效率。在进气温度为45°C，进气速度为2 m / s和9行HPHE的情况下，获得最高的效率为62.6％。HPHE的能量回收率随着蒸发器部分中的排数，进气温度和空气速度的增加而增加。ε-NTU方法可以用作比较方法，用于分析应用HPHE空调系统的热回收系统。利用HVAC系统中房间的冷空气排放的热管可以提高效率并减少排放。