مطالعه عددی تأثیرات سیستم افشانه و پدهای مرطوب در توزیع دمای گلخانه ای با سیستم تهویه فن

شهریاری, سجاد; مؤیدی, محمد کاظم

مطالعه عددی تأثیرات سیستم افشانه و پدهای مرطوب در توزیع دمای گلخانه ای با سیستم تهویه فن

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ کارشناسی ارشد، گروه مهندسی مکانیک، دانشگاه قـم، قم، ایران

² دانشیار، آزمایشگاه پژوهشی اتمسفر زمین و علوم فضایی، گروه مهندسی مکانیک، دانشگاه قـم، قم، ایران

چکیده

در این پژوهش رفتار جریان هوا، تغییرات دما و رطوبت در یک سالن گلخانه به کمک شبیه سازی عددی مطالعه شده‌است. به منظور رطوبت دهی به هوای در حال جریان داخل سالن گلخانه، دو میزان متفاوت از آب با سه روش متفاوت به هوای عبوری به سالن گلخانه پاشش می‌شود در روش اول دو پد رطوبتی با مجموع سطح مقطع 15 متر مربع و در روش دوم دو افشانه در فاصله 5 و 30 متری از دیوار ابتدایی سالن و در ارتفاع 3 متری از کف گلخانه عملیات پاشش آب را انجام می‌دهند. در روش سوم، بیست‌وهفت افشانه عملیات پاشش قطرات آب را در مختصات مختلف به هوای عبوری گلخانه پاشش می‌کنند. در سمت دیگر سالن گلخانه چهار فن با فشار منفی قرار دارند که جریان هوای تازه را در داخل سالن برقرار می‌کنند. پس از اعتبار سنجی نتایج، از مدل توسعه‌یافته به منظور بررسی رفتار جریان و تاثیر انرژی نهان آب در تهویه گلخانه و رطوبت نسبی بهره گرفته شده‌است. با بررسی چهارده حالت تزریق رطوبت به هوای گلخانه، بهینه ترین حالت‌ به ازای فشار خروجی فن برابر 50 پاسکال، با مدل 27 افشانه و نرخ جریان جرمی پاشش قطرات معادل 04/0 بدست آمده است. از طرفی اگر با معیار تغییرات دما و شرایط محیطی مناسب، طرح‌های اشاره شده مورد بررسی قرار گیرند، مشاهده می‌شود حالتی که از مدل پد رطوبت‌زنی با فشار فن 100 پاسکال و نرخ جریان جرمی پاشش قطرات 08/0 استفاده می‌شود، بهترین طرح برای رشد گیاهانی چون گلایل در محیط گلخانه مورد بررسی خواهد بود.

کلیدواژه‌ها

20.1001.1.23223278.1403.13.1.1.7

عنوان مقاله [English]

Numerical Study on the Effects of Spray System and Wet Pads on the Greenhouse Temperature Distribution by Fan Ventilation System

نویسندگان [English]

Sajjad Shahriari ¹
Mohammad Kazem Moayyedi ²

¹ Master's degree, Department of Mechanical Engineering, University of Qom, Qom, Iran

² Associate Professor, Research Laboratory of Earth Atmosphere and Space Sciences, Department of Mechanical Engineering, University of Qom, Qom, Iran

چکیده [English]

In this research, the behavior of air flow, temperature, and humidity changes in a greenhouse hall will be modeled with the help of numerical simulation. To increase the humidity of the air flowing inside the greenhouse hall, two amounts of 04 water are sprayed into the air passing into the greenhouse hall using three different methods. In the first method, two moisture pads and in the second method, two sprinklers spray water at specific and fixed distances and at a height of 3 meters from the floor of the greenhouse. In the third method, twenty-seven sprinklers spray water droplets in different coordinates to the passing air of the greenhouse. On the other side of the greenhouse hall, there are four fans with negative pressure, establishing the flow of fresh air inside the hall. To model the effects of turbulence in the flow field, the turbulence modeling approach has been used. After validating the numerical results, the outcome model has been used to study the flow behavior and the effect of the latent energy of water in greenhouse ventilation and relative humidity. By examining fourteen modes of moisture injection into the greenhouse, the most optimal mode - 50-b-27f has been obtained. On the other hand, if the mentioned plans are examined with the criterion of temperature changes and suitable environmental conditions, it can be seen that the 100-c-p mode will be the best plan for the growth of plants such as Gladiolus in the greenhouse environment.

کلیدواژه‌ها [English]

Greenhouse ventilation
computational fluid dynamics
temperature distribution
humidity ratio
evaporation

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