dfasd Essays - Greenhouse Gases, Atmosphere Of Earth, Carbon Dioxide

oxygen and restaurant supply companies VIRGINIA Location Purchase Y/N $ Fill Swap Hydro Test Price For Fill/Swap LBS/$ Fire Control Systems 410 Copeland DR. Hampton VA 23661 (757) 723-9111 Yes $20 for 10 lb Yates Fire Protection Service 2314 60th ST Hampton VA 23661 (757) 827-8696 *footnote 5 20 lb for $65 Yes Yes $15 for 10 lb c02 The reason you will get more rapid and efficient growth and better plant quality with a higher CO2 level is because plants must absorb CO2 in combination with water, soil nutrients and sunlight which produces sugars which are vital for growth. If any of these elements are missing or low, plant growth will be retarded. When CO2 is increased to over 1000 ppm it results in higher production and plant quality. The best time to add CO2 is from dawn to dusk. CO2 ranges from 400 to 500 ppm during the night due to plant respiration. Right after sunrise a level will drop to about 300 ppm. After three to four hours of early sun light it will drop to 100 to 250 ppm at which time growth will stop. If you add CO2 during the winter months when ventilators are closed and CO2 concentrations are low, you will get increased yield and bloom which normally happens during the spring and summer. This is a formula which can be used to figure what amount of CO2 must be added to reach 1000 ppm. 9 ft.? of CO2 per hour per 1000 ft.? yields 1000 ppm When there is sunlight and vents are closed you should be adding CO2 continuously to your greenhouse. If the vents are open because of heat you should continue to add CO2 for two additional hours. 2. COMPRESSED, BOTTLED CO2: This is the second most popular method of CO2 enrichment and provides fairly accurate, controlled results. Compressed CO2 comes in metal containers under high pressure. Small cylinders contain 20 lbs. of compressed CO and large tanks hold 50 lbs. Pressure ranges from 1600 pounds per square inch to 2200 PSI. To enrich available CO with compressed gas, the following equipment is needed: 1. Tank of compressed CO2 2. Pressure regulator 3. Flow meter 4. Solenoid valve, (plastic or metal) 5. Short-interval 24 hr. timer capable of having an "on time" variable from one to 20 minutes. 6. Connecting tubing, fittings and adapters PRESSURIZED CO2 ENRICHMENT SYSTEM ARRANGEMENT This method allows for the injection of a controlled amount of CO2 into the growing area at a given interval of time. The pressure regulator reduces the compressed gas pressure from 2200 lbs./square inch to a more controllable amount (100 to 200 PSI) which the flow meter can handle. The flow meter will deliver so many cubic feet per minute of CO2 to the plants for the duration of time that the solenoid valve is opened. The timer controls the time of day and length of time that the solenoid valve is open. To operate this CO enrichment system in our standard 8' X 8' X 8' grow room area, we want to add enough CO to increase the near depleted level of 200 PPM to 1500 PPM. We must then add 1300 PPM of CO2 to a volume of 512 cu. ft. We would like to do this in intervals of time relative to the natural air exchange rate (leakage rate) to keep the CO level near the 1500 PPM range. Let's select an injection time interval (CO2 enrichment time) of every two hours. First, we must determine how many cubic feet of CO2 must be added to 512 cu. ft. of volume to increase our 200 PPM to 1500 PPM. To do this, multiply the room volume of 512 cu. ft. by .0013 (1300 PPM) to obtain 0.66 cu. ft. of CO2 that is needed. Set the regulator at 100 PSI and the flow meter at 20 CFH (Cubic Feet per Hour) or 0.33 cubic feet per minute. If we set our timer to stay on for two minutes every two hours, we will get the 0.66 cubic feet of additional CO we need to bring the CO level to the 1500 PPM optimum level needed. Each pound of CO compressed gas contains approximately 8.7 cubic feet of CO gas at