تقييم الأداء الحراري للستائر المتحركة في البيوت البلاستيكية خلال فصل الشتاء دراسة ميدانية في محافظة طرطوس

Abstract

Plastic greenhouses suffer from substantial nocturnal heat losses, which lead to reduced production efficiency during cold seasons and increased energy consumption. This field study, conducted in Tartous Governorate during the period from (5 to 21 February 2025), aimed to evaluate the thermal performance of a three-layer movable curtain composed of high-density polyethylene, a reflective aluminum layer, and polyester, installed in a semi-circular plastic greenhouse.

Two main operational modes were tested: continuous night-time closure and intermittent operation (opening and closing every two hours). Air temperature, relative humidity, and solar radiation were continuously recorded using high-precision sensors connected to a cloud-based data logging system.

The results showed that continuous night-time closure improved the internal thermal balance and reduced heat losses by an average of 6.5 °C, while relative humidity increased by (7.2%), achieving a specific thermal saving of (0.85 kWh/m²). In contrast, intermittent operation resulted in greater thermal fluctuations and a decrease in stored energy to (0.21 kWh/m²). The curtain performance also improved under conditions of high solar radiation (400 W/m²) and declined during cloudy days.