A Tale of Two Boxes Temperatures in Shipped Liner Boxes During Winter
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1 A Tale of Two Boxes Temperatures in ped Liner Boxes During Winter Internal Report for UNH Young Plant Center Research Partners. Not for publication or reproduction in part or full without permission of authors. Copyright UNH, June 2, 200. By Paul Fisher, Kate Santos and Cheryl Smith, University of New Hampshire, Durham, NH tel , fax Table of Contents Pages Executive Summary 1 Introduction. 2 Evaluation Methods 2- Results Executive Summary Two trials were run to evaluate cooling of cardboard shipping containers with and without half-inch polystyrene insulation. In a cool-down trial where boxes were placed at sub-freezing air temperature: Uninsulated boxes dropped more quickly in temperature, about twice the rate of insulated boxes. Within 3.h, uninsulated boxes reached freezing point, compared with 7h for insulated boxes. Internal box temperatures remained near freezing for 10 hours, presumably from the heat released from freezing media. After media froze, uninsulated boxes dropped more quickly and finished colder than insulated boxes (final temperature was -12C (11F) compared with -4C (24F), respectively). In a shipping trial where boxes were shipped six times between New Hampshire, New Jersey, and Colorado in January-February: Insulated boxes tended to be 2-3C (3-F) warmer than uninsulated boxes in terms of average and minimum temperatures. The average temperature inside the boxes was 47.8F for the uninsulated boxes, and a warmer 0.8F for the insulated boxes. In comparison, the average temperature outside the box averaged 47.1F. The only case where temperature inside an insulated box fell below freezing was in the DHL shipment from Kube-Pak (NJ) to Welby Gardens (CO), where outside temperatures were below freezing for approx. 10 hours. Internal box temperature dropped below freezing in un-insulated boxes during 2 out of 9 shipments. In 81% (17 out of 21) of the shipments, external temperatures dropped below freezing. This was a successful trial, and it would be worthwhile doing a warm-up trial with insulation and ice-packs in warm conditions, and repeating the box shipment during April and July. 1
2 Introduction Liners are normally shipped in cardboard boxes. Boxes are sometimes insulated with a 1/2 inch thick polystyrene (styrofoam) layer inside the box to avoid temperature extremes. We are doing a series of trials related to post-harvest quality of rooted liners. We therefore wanted to know what temperatures were experienced by boxes being shipped between U.S. greenhouses by commercial couriers. Our grower research partners are also interested in the temperatures that boxes experience during shipping, and whether it was worth the additional expense of adding polystyrene insulation to the box. Our objectives were to: 1. Quantify how quickly boxes with and without insulation cooled down in sub-freezing air temperature. 2. Quantify internal and external temperatures in boxes shipped between greenhouses during the winter, with and without insulation. Evaluation Methods We ran two trials for this experiment. In both trials, four trays filled with moist media were placed into the box, with internal cardboard spacers, at room temperature (68F) before initiating the treatments. In the first Cool Down Trial, four boxes were insulated (with polystyrene inserts) and four boxes were not insulated. A HOBO data logger with two temperature sensors was placed into each box, and temperature was recorded inside and outside the box every 10 minutes. The boxes were placed into an unheated room at 1.30 p.m. on Jan. 17 in Durham, NH, and left for 24 hours. Outside temperatures averaged -9.2C (1.F) during that 24h period and dropped for the first 20 h from - 0.C (31F) to -13C (8F). Temperatures were averaged between the two groups of four boxes, and compared with the external temperature. In the second ping Trial, we used two boxes with polystyrene insulation and two without insulation. Each box contained two loggers that each measured both internal and external temperatures. The unopened boxes were shipped six times, from Loudon, NH to Allentown, NJ to Denver, CO to Loudon, NH to Monroeville, NJ to Denver, CO to Durham, NH over a 20-day period. The date and time when boxes were received and shipped at each location were recorded (Table 1). When boxes arrived at the final location (Durham NH), data loggers were downloaded and temperature trends were analyzed. Boxes became separated from each other early in the shipping trial. Even where boxes were shipped on the same day and time, we had separate records of external temperatures for individual boxes. Boxes a and b mostly traveled together, and boxes c and d were also together throughout the trial. Data loggers in one box (Box a) became erratic after the first three shipments, so data were only analyzed for the first three shipments for that box. 2
3 HOBO Temperature sensor and external lead used in experiment. Photo of closed box with external leads taped to outside. Box at the end of the trial. Data sheet at the end of the Trial. 3
4 Photo demonstrating how sensors were taped to the top of the third cardboard insert. Leads were fed out through the corner of the box. Cross section of an insulated box with all four trays, temperature sensors and media. Another photo (uninsulated box this time) illustrating how leads were pulled out of box. Uninsulated Box with trays And temperature sensors. 4
5 Table 1. Details of shipping locations and dates Uninsulated Box a Insulated Box b Uninsulated Box c Insulated Box d ped from ped to Courier D.S. Cole Growers, NH Kube Pak Corp., NJ FedEx 20-Jan 14:30 21-Jan 9:30 20-Jan 14:30 21-Jan 9:30 20-Jan 1:0 21-Jan 9:30 20-Jan 1:0 21-Jan 9:30 Kube Pak Corp., NJ Welby Gardens, CO Pleasant View Gardens, NH Lucas Greenhouses, NJ Center Greenhouses, CO Welby Gardens, CO Pleasant View Gardens, NH Lucas Greenhouses, NJ Center Greenhouses, CO Univ. of New Hampshire, NH UPS (a, b) or DHL (c, d) 24-Jan 14:4 2-Jan 11:30 24-Jan 14:4 2-Jan 11:30 24-Jan 16:00 2-Jan 11:30 24-Jan 16:00 2-Jan 11:30 FedEx 2-Jan 1:30 26-Jan 11:00 2-Jan 1:30 26-Jan 11:00 1-Feb 16:00 3-Feb 10:00 1-Feb 16:00 3-Feb 10:00 FedEx 31-Jan 14:40 3-Feb 10:00 31-Jan 14:40 2-Feb 11:00 3-Feb 16:00 4-Feb 10:00 3-Feb 16:00 4-Feb 10:00 FedEx 3-Feb 1:00 4-Feb 10:00 2-Feb 1:00 3-Feb 10:00 4-Feb 16:00 -Feb 10:00 4-Feb 16:00 -Feb 10:00 FedEx 6-Feb 1:00 7-Feb 14:1 6-Feb 1:00 7-Feb 14:1 8-Feb 1:00 9-Feb 14:00 8-Feb 1:00 9-Feb 14:00
6 Results Cool Down Trial Figure hour period showing cooling of insulated and uninsulated boxes. Each data point for internal temperatures of insulated and uninsulated boxes is the average of four sensors, and the external temperature is the average of 7 sensors. Temperature (C) Box Cool Down Trial Insulated External 13:30 1:30 17:30 19:30 21:30 23:30 1:30 3:30 :30 7:30 9:30 11:30 13:30 time (hours) insulated noninsulated external Uninsulated Temperature (F) Figure 2. Close-up of the first 8 hours in the Cool Down Trial. Temperature (C) Box Cool Down Trial Uninsulated External insulated noninsulated external Insulated Temperature (F) (hours) Uninsulated boxes dropped more quickly in temperature, about twice the rate of insulated boxes. Within 3.h, uninsulated boxes reached freezing point, compared with 7h for insulated boxes. Internal box temperatures remained near freezing for 10 hours, presumably from the heat released from freezing media. After media froze, uninsulated boxes dropped more quickly and finished colder than insulated boxes (final temperature was -12C (11F) compared with -4C (24F), respectively). 6
7 ping trial Figure 3. Temperature log over time (Boxes a and b). The black bars shows the shipping periods. The difference line shows the inside box temperature minus the external temperature. The loggers failed in Box a during the fourth shipment, so the data from the last three shipments are not presented for Box a. Between the shipping periods, boxes were stored at the greenhouses. Boxes a and b traveled together during the first three shipments. Box a uninsulated Temperature (F) Jan 23-Jan 28-Jan 2-Feb 7-Feb 12-Feb No insulation, Inside No insulation, Outside No insulation, Difference ping period Box b insulated 80 Temperature (F) Jan 23-Jan 28-Jan 2-Feb 7-Feb 12-Feb Insulation, Inside Insulation, Outside Difference outside temps ping period 7
8 Figure 4. Temperature log over time (Boxes c and d). The black bars shows the shipping periods. The difference line shows the inside box temperature minus the external temperature. Between the shipping periods, boxes were stored at the greenhouses. Boxes c and d traveled together during all shipments. Box c uninsulated 80 Temperature (F) Jan 23-Jan 28-Jan 2-Feb 7-Feb 12-Feb No insulation, Inside No insulation, Outside No insulation, Difference ping period Box d insulated 80 Temperature (F) Jan 23-Jan 28-Jan 2-Feb 7-Feb 12-Feb Insulation, Inside Insulation, Outside Difference outside temps ping period 8
9 Table 2. Summary table of the ping Trial Overall averages Minimum temperature (median) Maximum temperature (median) Mean temperature (mean) Minutes at or below 32F (median) Proportion of shipments that froze Uninsulated inside Uninsulated outside Insulated inside Insulated outside All boxes, inside All boxes, outside % (2 of 9) 78% (7 of 9) 8% (1 of 12) 83% (10 of 12) 14% (3 of 21) 81% (17 of 21) Table 2 summarizes all of the shipments, which are shown in more detail in Figures 3 and 4, and Table 3. The take home messages from the ping Trial are: Insulated boxes tended to be 3-F warmer than uninsulated boxes. The average temperature inside the boxes was 47.8F for the uninsulated boxes, and a warmer 0.8F for the insulated boxes. In comparison, the average temperature outside the box averaged 47.1F. The only case where temperature inside an insulated box fell below freezing was in the DHL shipment from Kube-Pak NJ to Welby Gardens CO, where outside temperatures were below freezing for approx. 10 hours. In contrast, internal box temperature dropped below freezing in uninsulated boxes with 22 % (2 out of 9) of shipments. In 81% (17 out of 21) of the shipments, external temperatures dropped below freezing. 9
10 Table 3. Summaries of individual boxes in each shipment ping event Box a Box b Box c Box d no insulation insulation no insulation insulation inside box outside box inside box outside box inside box outside box inside box outside box 1 start: NH (D.S. Cole Growers) minimum end: NJ (Kube-Pak) maximum Courier: FedEx mean Duration: 19h minutes at or below 32F start: NJ (Kube-Pak) minimum end: CO (Welby Gardens) maximum Courier: UPS (a&b), DHL (c&d) mean Duration: 20 (a&b) to 18.h minutes at or below 32F (c&d) 3 start: CO (Welby Gardens) minimum end: NH (Pleasant View maximum Gardens) Courier: FedEx mean Duration: 19. (a&b) to 42h minutes at or below 32F (c&d) 4 start: NH (Pleasant View Gardens) minimum end: NJ (Lucas Greenhouses) maximum Courier: FedEx mean Duration: 18 to 19.h minutes at or below 32F start: NJ (Lucas Greenhouses) minimum end: CO (Center Greenhouses) maximum Courier: FedEx mean Duration: 19 (a&b) to 18h (c&d) minutes at or below 32F start: CO (Center Greenhouses) minimum end: NH (Univ. of New maximum Hampshire) Courier: FedEx mean Duration: 23h minutes at or below 32F
11 A Tale of Two Boxes SUPPLEMENT 1: SPRING April-May Internal Report for UNH Young Plant Center Research Partners. Not for publication. Copyright UNH, June By Dr. Paul Fisher, Kate Santos and Cheryl Smith, University of New Hampshire, Durham, NH Paul.Fisher@unh.edu, tel , fax In mid-april to early May 200, we repeated the shipments of liner boxes between our grower research partners: ped from ped to Courier ped ped Duration (hrs) D.S.Cole Growers, NH Kube Pak Corporation, NJ Welby Gardens, CO Pleasant View Gardens, NH Lucas Greenhouses, NJ Center Greenhouses, CO Kube Pak Corporation, NJ Welby Gardens, CO Pleasant View Gardens, NH Lucas Greenhouses, NJ Center Greenhouses, CO University of New Hampshire, NH FedEx 14-Apr 4:10 PM 1-Apr 11:4 AM 19.3 UPS 1-Apr 4:00 PM 21-Apr 9:30 AM FedEx 22-Apr 4:00 PM 26-Apr 11:00 AM FedEx 27-Apr 4:00 PM 28-Apr 12:00 PM FedEx 2-May 2:00 PM 3-May 9:4 AM 19.4 FedEx 4-May 3:00 PM 9-May 3:00 PM The same methodology was followed as in the winter trial. In this trial, however, the two insulated and two uninsulated boxes traveled together for the entire period. Each box contained two internal and two external temperature sensors. Internal temperatures were averaged from the four sensors in each box type. External temperature reported represent the average of all eight external sensors. Results are presented on the next page. Insulated boxes had less fluctuations than uninsulated boxes. No boxes experienced freezing external temperatures. Average temperature in uninsulated boxes was 7 o F, compared with 9 o F in insulated boxes. The coldest temperature experienced in uninsulated boxes was 40 o F, compared with 4 o F in insulated boxes. The warmest temperature experienced in uninsulated boxes was 79 o F, compared with 73 o F in insulated boxes. External temperatures ranged from 41 o F to 79 o F during the trial. 1
12 Results from the April-May liner box shipping trial. Temperatures are in degrees Fahrenheit. ping event Uninsulated internal Insulated internal External 1 start: NH (D.S. Cole Growers) minimum end: NJ (Kube-Pak) maximum Courier: FedEx mean start: NJ (Kube-Pak) minimum end: CO (Welby Gardens) maximum Courier: UPS mean start: CO (Welby Gardens) minimum end: NH (Pleasant View Gardens) maximum Courier: FedEx mean start: NH (Pleasant View Gardens) minimum 6 9 end: NJ (Lucas Greenhouses) maximum Courier: FedEx mean start: NJ (Lucas Greenhouses) minimum end: CO (Center Greenhouses) maximum Courier: FedEx mean start: CO (Center Greenhouses) minimum end: NH (Univ. of New Hampshire) maximum Courier: FedEx mean 7 7 Uninsulated Insulated Overall averages internal internal External Minimum temperature (median) minimum Maximum temperature (median) maximum Average temperature (mean) mean
13 A Tale of Two Boxes SUPPLEMENT 2: SUMMER August 200 Internal Report for UNH Young Plant Center Research Partners. Not for publication. Copyright UNH, June By Dr. Paul Fisher, Kate Santos and Cheryl Smith, University of New Hampshire, Durham, NH Paul.Fisher@unh.edu, tel , fax From beginning to end of August, we repeated the shipments of liner boxes between our grower research partners: ped from University of New Hampshire, NH Kube Pak Corporation, NJ Welby Gardens, CO ped to Kube Pak Corporation, NJ Courier ped ped Duration (hrs) FedEx 1-Aug 3:30 PM 2-Aug 9:4 AM 18.3 Welby Gardens, CO UPS 2-Aug 3:30 PM 8-Aug 9:30 AM Pleasant View Gardens, NH FedEx 8-Aug 3:30 PM 12-Aug 10:30 AM 91.0 Pleasant View Gardens, NH Lucas Greenhouses, NJ Center Greenhouses, CO Lucas Greenhouses, NJ Center Greenhouses, CO University of New Hampshire, NH FedEx 1-Aug 4:00 PM 16-Aug 10:30 AM 18. FedEx 17-Aug 2:00 PM 18-Aug 8:30 AM 18. FedEx 18-Aug 2:00 PM 22-Aug 10:0 AM 92.8 The same methodology was followed as in the spring trial, with two insulated and two uninsulated boxes traveling together for the entire period. In the final shipment from Center to UNH, box 1 (uninsulated) arrived 2 days after the other 3 boxes, despite being shipped on the same day. Each box contained two internal and two external temperature sensors. Internal temperatures were averaged from the four sensors in each box type. External temperature reported represent the average of all eight external sensors. Results are presented on the next page. Temperatures inside the boxes were similar to external temperatures, although the peak temperatures were higher outside the box. There was no benefit of insulation, and average temperature inside both types of boxes was 78 o F. Because the media dried down over the duration of the trial, there was no benefit of evaporative cooling or buffering of temperature from moist media. Media also arrived to greenhouses warm and was shipped again in the same condition so never had a cooling down phase between shipments. 1
14 Results from the August liner box shipping trial. Temperatures are in degrees Fahrenheit. ping event Uninsulated internal Insulated internal External 1 start: NH (UNH) minimum end: NJ (Kube-Pak) maximum Courier: FedEx mean start: NJ (Kube-Pak) minimum end: CO (Welby Gardens) maximum Courier: UPS mean start: CO (Welby Gardens) minimum end: NH (Pleasant View Gardens) maximum Courier: FedEx mean start: NH (Pleasant View Gardens) minimum end: NJ (Lucas Greenhouses) maximum Courier: FedEx mean start: NJ (Lucas Greenhouses) minimum end: CO (Center Greenhouses) maximum Courier: FedEx mean start: CO (Center Greenhouses) minimum end: NH (Univ. of New Hampshire) maximum Courier: FedEx mean Uninsulated Insulated Overall averages internal internal External Minimum temperature (median) minimum Maximum temperature (median) maximum Average temperature (mean) mean
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