EdenPURE Heaters
19 years ago
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- 19 years agolast modified: 11 years ago
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Comments (2)for a greenhouse you are better off with a "blue flame" or "space heater" These kinds of heaters are used to heat the air. An infrared heater is used to heat objects directly...it's why when you're in front of one it feels nice and warm....See MoreEdenPure Gen3 pros and cons anyone?
Comments (34)Cayveman, I finally checked back on this thread. It's about thermodynamics and the conservation of energy, so in easy to understand terms when you have energy input (like the voltage and amps going to the heater) and what comes out has to be the same because the energy can't magically increase or be destroyed. It's simpler with electric resistance heaters because inefficiencies that we normally see in motors, pumps, etc. manifest themselves as heat which in this case we want. So the energy (kwh) can be directly converted to Btu's (Btu = Btu/hr average x number of hrs on). The reason I say Btu/hr average is that the heaters thermostat turns the heating element on and off. As for the heat lamp vs a std lamp, if they both draw 100 watts of power, they have the same heat output in Btus to a space. The std lamp would have a higher lumens (measurement of light) per watt but even the light after being absorbed and reflected by surfaces converts to heat. So there is ultimately no difference in the heat added to a room. Other items in your home such as TV's, dishwashers, etc. are not 100% efficient at doing the intended task, but all the input power in them as well converts into heat. So a dishwasher or refrigerator running helps heat your house as well as a portable heater in the winter but adds to the air conditioning load in the summer. Calculating the heat output is easy because all of the inefficiency of the motors and circuits in your appliances result in heat. That is not the case with your electric water heater because much of the heat is dumped down the drain with your bathwater and only a part of the heat stays in your home. Lastly concerning heating of air or water, the equation is the same for sensible heating or cooling (w/o removing moisture like an Air Cond. in the summer). What I think everyone is interested in is heating the space so a thermostat will show a higher temperature in the room. There is radiant heating used in non heated spaces where people have to stand in a line of site of the heater to feel the heat but that is like standing in front of a fireplace to keep warm. The equation for heating air or water is: Btu = mass x heat capacity x Temperature difference The difference is that water has a spec. wt. of about 62.4 pounds per cubic ft (Varies with temperature and can be found on the web.) Air is only about 0.075 pounds per cubic foot. (Varies with temperature and can be found on the web.) Also the heat capacity of water is 1.0 Btu/pound - deg F while that for air is 0.24 Btu/pound - deg F. Example: Small bathroom 5 ft x 9 ft with 8 ft ceilings at 40 degrees F. We want to heat to 80 deg F using a portable electric heater having an input of 1500 watts ( 5,119.5 Btu/hr input = output). Volume = 6 x 9 x 8 = 432 cubic ft Mass = 432 cubic ft x 0.075 pounds/cubic ft = 32.4 pounds Specific Heat of air = .24 Btu required = 32.4 pounds x 0.24 Btu/pound - deg F x (80 - 40) deg F = 311 Btu kWh= 311 Btu x 1 kWh / 3413 Btu = 0.091 kwh Time required to heat the room = 311 Btu x 1 hr / 5119.5 Btu = 0.0608 hr = 3.64 minutes You would actually take more than 3.64 minutes because you would be heating all the fixtures, walls, and if not insulated well other adjacent rooms. I asked my mailman if I could borrow one of his edenpure heaters for a test just to compare what Im describing above, the heating of a small bathroom with two types of heaters just for fun. I have the equipment to measure input energy and the air temperatures would have to be measured in several areas in the room every 30 seconds or so and recorded. There wont be a difference because its impossible but it might be interesting to post the test results. Could be done in the summer but you would have to heat the room to 100 deg F to get good results and preferably before the sun comes up (to eliminate another factor) and at about the same outdoor air temperature. What goes in has to be what comes out. It cant disappear or get larger. Not talking about heat pumps or air conditioners right now as that is a more complex subject and those units have COPs and EERs associated with them where the heat addition to a space is higher than the compressor energy used. They still dont violate the laws of thermodynamics about the creation or destruction of energy. Again this isnt saying everything is 100% efficient. Its just electrical appliances, heaters which wont have 100% efficient motors but the inefficiencies manifest themselves as heat. I used to sell pumps as a sales engineer and our pump curves would show the pump efficiencies which would vary depending on rpm, flow rate, and pressure. What this meant was that the motor and pump when combined might only be 75% efficient and was determined by tests performed by the pump and motor manufacturers that were shown on graphs that engineers used. The efficiency the manufacturer stated was based on the actual power required to pump a given flow and pressure compared to the theoretical power required (based on another engineering formula). All the electric power (watts) into the motor ends up as heat while moving the water. Pumping the water even heats it up slightly. Hope this clarifies things and I havent been too long winded. Even if its stored by being absorbed by a piece of copper it eventually is released into the air. It has to be the same as what's input. The same is true of a 100 watt light bulb no matter what type it is, although a heat lamp having larger diameter wire inside its bulb outputs a smaller percentage of light and more heat...See MoreTomato leaves turning purple... Help!!
Comments (12)Diagnostics: Purple under leaves of tomatoes is a trait of phosphorus deficiency. This is the most telling trait of that deficiency. The yellowing of seedling leaves (lower part) is the deficiency of a mobile nutrient. The plant takes the nutrient from the lower leaves and moves it up to the growing portion at the meristem. Phosphorus is a mobile element. These two factors together diagnose your plant as definitely phosphorus deficient. Organic miracle grow is great, but tomatoes are heavy phosphorus feeder. Phosphorus is found in the soil in small, ever present amounts that are broken down from soil minerals (making it a bit different from Nitrogen in that respect). This will probably clear up once you get them into the ground with some nice soil and cations :) . If your plant were large enough to bear fruit, lower leaf chlorosis could be caused by an Mg deficiency. My advice is to transplant them as soon as the LFFD occurs. If you cannot, adding a bit of regular miracle grow solution may solve the problem (use the weak, smaller scoop, well diluted as directed) until you can get them into their final home....See MoreEdenPure heater?
Comments (35)They are likely saving $$$ because they are not heating their entire home but rather only the room the edenpure is in...nothing wrong with that...just that you could do the same thing with a $25 heater....though I admit it may not look as nice and perhaps be a burn hazzard. Re: FYI: Emergency heat is an electric coil in the airstream of your heatpump. It consumes the same wattage per BTU produced as your Edenpure. If the emergency mode can't keep up, it is either undersized, broken or control issue not kicking in all stages. Our unit is 20 years old and we had an estimate to replace which reccomeded the emergency heat (plates or something)be of greater size or capacity since the ones in there now are marginal for the house size. It (heat pump emergency heat) may consume the same as other heaters but a space heater in a room will not run as long....again its only heating that room. RE: Those amish heaters...ok they just make the wood mantal and the heater is thrown in for free....I find that commercial ammusing...I also chuckle at the part where that proudly state that the heater 'earned the coveted UL approval'...HA---so did my alarm clock!...See More- 19 years agolast modified: 11 years ago
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