Search National Agricultural Library Digital Collections

NALDC Record Details:

Evaluating the storage environment in hypobaric chambers used for disinfesting fresh fruits

Permanent URL:
http://handle.nal.usda.gov/10113/55012
Abstract:
Low pressure (LP) treatment has potential as an alternative non-chemical postharvest disinfestation method for fresh fruits. A validated computer simulation model was used to determine the thickness of foam insulation needed to cover the hypobaric chamber walls in order to stabilise the air temperature within the hypobaric chambers that were housed in a cold storage room with fluctuating air temperatures. The stability of pressure, temperature and relative humidity levels in the LP system was evaluated together with various O2 concentrations, evacuation, venting and leakage rates. Results showed that the added foam covering the chambers maintained the temperature variation of the hypobaric chamber wall to within ±0.2 °C and inside air to within ±0.1 °C. The regulating system kept pressure to within ±1% of the set point, and maintained relative humidity at nearly saturated levels (>98%) under various air exchange rates and pressures, with a chamber leakage rate of 0.009 kPa h−1 and LP system leakage rate of 0.480 kPa h−1. Given that the hypobaric chamber displayed adequate performance characteristics, further studies will be conducted to evaluate LP treatment efficacy for fresh fruits.
Author(s):
Shunshan Jiao , Judy A. Johnson , John K. Fellman , Dennis S. Mattinson , Juming Tang , Tom L. Davenport , Shaojin Wang
Subject(s):
air temperature , cold storage , computers , disinfestation , equipment performance , foams , gas exchange , insulating materials , low pressure treatment , postharvest treatment , raw fruit , relative humidity , simulation models , storage equipment
Source:
Biosystems engineering 2012 March v.111 no.3
Language:
English
Publisher:
Elsevier Ltd
Year:
2012
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.