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Jutarat Rattanakaran. Application of room cooling and thermal insulation materials in cool chain management of Okra. Master's Degree(Postharvest Technology and Innovation). Mae Fah Luang University. Learning Resources and Educational Media Centre. : Mae Fah Luang University, 2021.
Application of room cooling and thermal insulation materials in cool chain management of Okra
Name: Jutarat Rattanakaran
Address:
333 Moo1, Thasud, Muang, Chiang Rai 57100
Organization :
Mae Fah Luang University
Email :
library@mfu.ac.th
keyword:
Covering Material
Classification :.DDC: e-thesis
;
Decay
MeSH:
Insulation (Heat)
-- 307081
MeSH:
Polyethylene
LCSH:
Insulation (Heat)
-- 307081
LCSH:
Polyethylene
Abstract:
Temperature and relative humidity (RH) fluctuations during storage and transportation cause wilting and heat damage before processing of okra during storage and transportation. This work was the first to study room cooling and thermal-insulation materials for cool chain management for reduction of postharvest losses of okra and other perishable crops.
In the first trial, a typical handling (TP) and covering with perforated linear low-density polyethylene (P-LLDPE) without room cooling were employed as control treatments compared with developing handling (DH). After either room cooling at 0 °C for 2 h or no cooling, the okra pods were covered with three different materials: 1) perforated linear low-density polyethylene (P-LLDPE), 2) two layers of heat reflective sheet with thin nonwoven (HRS+TNNW), and 3) metalized foam sheet (MFS). After room cooling, HRS+TNNW and MFS covers (10 h) delayed a rise of pulp temperature to reach 18 °C, compared to P-LLDPE (2 h). TP treatment had highest postharvest losses (mass loss and the incidence of decay) (65%), followed by P-LLDPE without cooling (59%), MFS without cooling (52%), MFS with cooling (27%), HRS+TNNW without cooling (26%), and HRS+TNNW with cooling (15%). Room cooling demonstrated an important pretreatment before applying thermal insulation covers to delay an increase of temperature and to protect heat accumulation.
In the second trial, efficiency of different thermal insulation materials to minimize temperature rise and fluctuation was determined. Room cooling at 0 °C for 2 h was applied in okra samples before covering. Four thermal insulation covering materials: (1) heat reflective sheet with thin nonwoven (HRS+TNNW), (2) heat refractive sheet with thick nonwoven (HRS+TKNW), (3) metalized Tyvek® (MTyvek) and (4) metalized foam sheet (MFS) were studied and compared with perforated linear low-density polyethylene (P-LLDPE) and no cover as control treatment. The material properties including thickness, thermal heat energy (Qx), thermal resistance (R-value), air permeability and water vapor permeability (WVP) were investigated. The proper thermal insulation material for okra covering should have low Qx, high R-value and moderate WVP values. HRS+TNNW and HRS+TKNW had the lowest rate of air and pulp temperature changes. HRS+TNNW cover (5%) exhibited the lowest postharvest losses followed by HRS+TKNW (10%), P-LLDPE (11%), MFS (13%), no cover (18%) and MTyvek (23%), respectively.
In conclusion, the combination of room cooling and HRS+TNNW exhibited the greatest efficiency for maintaining cool temperature and minimizing postharvest loss of okra during simulated storage and transportation. HRS+TNNW prototype had good performance in terms of material and okra quality comparable to the commercial cover (MFS). In future study, HRS+TNNW is suggested to improve material functions or properties to apply in okra and other fresh produce.
Mae Fah Luang University. Learning Resources and Educational Media Centre
Address:
CHIANG RAI
Email:
library@mfu.ac.th
Name: Saowapa Chaiwong
Role:
Advisor
Created:
2021
Modified:
2025-01-29
Issued:
2025-01-29
วิทยานิพนธ์/Thesis
application/pdf
CallNumber:
e-thesis
eng
DegreeName: Master of Science
Level: Master's Degree
Descipline: Postharvest Technology and Innovation
Grantor: Mae Fah Luang University
©copyrights Mae Fah Luang University
RightsAccess:
ใช้เวลา
0.033636 วินาที
Jutarat Rattanakaran
| Title | Contributor | Type |
|---|---|---|
| Application of room cooling and thermal insulation materials in cool chain management of Okra
มหาวิทยาลัยแม่ฟ้าหลวง Jutarat Rattanakaran | Saowapa Chaiwong | วิทยานิพนธ์/Thesis |
Saowapa Chaiwong
| Title | Creator | Type and Date Create |
|---|---|---|
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| Application of room cooling and thermal insulation materials in cool chain management of Okra
มหาวิทยาลัยแม่ฟ้าหลวง Saowapa Chaiwong | Jutarat Rattanakaran | วิทยานิพนธ์/Thesis |
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