Analysis of local cooling performance of heat exchangers suitable for crop cultivation in greenhouses

Name: Wai, Thiri Shoon

Organization : Mie University. Graduate School of Engineering

Name: Maruyama, Naoki

Organization : Mie University. Graduate School of Engineering

Email : maruyama.naoki@mie-u.ac.jp

Name: Napassawan Wongmongkol

Organization : Chiang Mai University. Faculty of Engineering

Name: Chatchawan Chaichana

Organization : Chiang Mai University. Faculty of Engineering

Name: Hirota, Masafumi

Organization : Aichi Institute of Technology. Faculty of Engineering

LCSH: Heat exchangers

LCSH: Greenhouse management

LCSH: Crops -- Effect of temperature on

Abstract: The purpose of this study was to analyze the local cooling performance of heat exchangers proposed for greenhouse cultivation. Copper pipes arranged in a serpentine configuration were used as heat exchangers to cool the crop area. In particular, this study highlights the reduction in the local air temperature under two different heat exchanger configurations and describes the characteristics of the heat exchangers. Two different heat exchanger configurations were tested in the same test area to evaluate the local air temperature profiles near the crops, heat transfer, and pressure drop. The diameter of the copper pipe was 15.88 mm and the pipe spacing in the two heat exchangers was 50 and 100 mm. Cooling experiments were conducted under conditions involving the inlet water fluid temperature and fluid flow rate. The inlet water fluid temperature was varied from −5 to 10 °C and the fluid flow rate ranged from 0.3 to 3.0 L/min. Experimental data such as the local air temperature, inlet and outlet water fluid temperatures, surface pipe temperatures, and pressure drop were measured. The average local air temperature reduction in the area below the serpentine heat exchangers reached 10 and 5.0 °C for pipe spacing of 50 mm and 100 mm, respectively. The average heat flux in the heat exchanger with 100 mm pipe spacing was two times higher than that in the heat exchanger with 50 mm pipe spacing. The pressure drop in the heat exchanger with 100 mm pipe spacing was approximately half that in the heat exchanger with 50 mm pipe spacing. This may reduce the pumping power and lead to a reduction in the energy consumption of the heat exchanger with a pipe spacing of 100 mm compared with that of an exchanger with pipe spacing of 50 mm. However, a heat exchanger with a pipe spacing of 50 mm can provide cooler air than that with a pipe spacing of 100 mm because the heat transfer area itself is increased

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2024

Modified: 2025-08-19

Issued: 2025-08-19

บทความ/Article

application/pdf

BibliograpyCitation : In Thai Society of Mechanical Engineers (TSME) and Kasetsart University (KU). The 14th TSME International Conference on Mechanical Engineering (TSME-ICoME14 2024) (ETM0007). Chonburi : Kasetsart University Sriracha Campus, 2024

eng

©copyrights King Mongkut's University of Technology North Bangkok

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	TSME-ICoME14 2024 ETM0007.pdf	1.11 MB

ใช้เวลา

0.040028 วินาที