GreenHab Report – May 18th

Crew 281 GreenHab Report 18 May 2023
GreenHab Officer: Megan Kane
Environmental control: mixed door open/ door open with fan
Average temperatures: 92.4 °F
Hours of supplemental light: None
Daily water usage for crops: 1.45 gallons
Daily water usage for research and/or other purposes: 0.4 gallons
Water in Blue Tank 172.34 gallons
Time(s) of watering for crops:
0834: refilled 2 water bottle (1 L) watered other plants as needed 1.5 L
1230: refilled 1 water bottle (500 mL) watered other plants as needed 1 L
Changes to crops: None
In the morning the GreenHab was checked and watered as required. Initial temperature was 90.8 degrees Fahrenheit dropping to only 86.9 degrees after the door was propped open. Air was stagnant. As per instructions the fan was not turned on.
Mission control was sent a request to permit working on ideas to cool the GreenHab with the goal of extending the greenhouse operations into the summer weather. This was granted and we began working to improve the airflow. We were able to generate a passive cross breeze in the GreenHab. Supplemental airflow was utilized during the midday peak heat of 105 °F and turned off when the clouds came back.
Utilizing several measurements in the GreenHab and referencing a psychrometric chart, we started the calculations to see if an alternative form of evaporative cooling could be constructed. We did a few tests with materials available to see which would be best for creating an adhoc cooling system. Further work will be done on this tomorrow. The goal being to always keep the GreenHab under 100 degrees. The temperature varied from 86 to 105 degrees Fahrenheit. It is noted that it is hottest in the morning and noon time frame due to the additional shade provided by the hab in the late afternoon.
Harvest: (include which crop and mass in grams): None
Support/supplies needed: None

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