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Adding airflow will almost always decrease the humidity. If you pull in air at 70%rh/65f and inside the greenhouse this air is warmed to 85f, the effective RH of that air is now only 16%, since the water capacity of the air increases massively with temperature. That changes your problem a bit. Basically you will have to balance how dry you want it in the ...


3

Do you know the burning temperature of the wood you intend to use? According to a quick search on the 'net, you're in trouble at about 450° F. Extended temperature at that level will ignite the wood. Your insulation should be inside your enclosure and the enclosure should be non-combustible. A hot air gun blowing into a well insulated enclosure will likely ...


3

The steam pressure in the boiler will be greater than atmospheric, so the steam temperature will be above 100C. A typical ready-built boiler boiler for steam powered models (sold with a pressure test certificate!) would have a maximum working pressure of 4 or 5 bar, which would give steam temperatures around 150C. Many common plastics will start to soften at ...


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If your temperature sensor is far away from the heat source, the detected temperature may increase even after the heat gun is turned off due to a preexisting temperature gradient evening itself out.


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Let's call the horizontal axis m and the vertical axis T. Consider a very small slice of the temperature curve starting from the time m to time m+dm. The area of this slice is $A= dm*T$, and its center of geometry is at the $T_{cg}=T/2$. Then the average temperature of the 1 cycle is, just using the CG of the different segments and use the following eq i: $$ ...


2

From what I understand you have temperature control since you have a heater in the system. How you go about it, for humidity control can vary significantly depending on the system implementation Suggested Humidity control through cooling heating If you want to actually control the humidity the way a lot of HVAC units do is to: first cool the air you are ...


2

Go to Omega.com to learn all you want to know about thermocouples (TC). I'll give you here a few basics, directed at your questions. TC science is well understood and standardardized. Every type TC is made with it's own precise metal alloy and all TC of the same type will output a voltage uniquely related to the temperature of the TC junction, within ...


1

See the chart in "Algorithm for your setup" (above). If you circulate air through a chilling set-up, you will condense excess moisture out of the air and reintroduce it to your environment drier. If your air is 25C and 50%RH then there is ~10g of water per KG of dry air inside. Draw the air into your chiller, lower the air temp. Chill the ...


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If you can find a liquid whose melting point is slightly above $-40\,\mathsf{^{\circ}C}$, pre-chill it to just above its melting point, then squirt some on to your bridge (in a controlled environment below $-40\,\mathsf{^{\circ}C}$) and let it freeze, it might form a cement that will hold the bridge together. Heptanol has about the right melting point, but ...


1

Consumer analog thermometers are generally inaccurate. You can get inexpensive infrared which I have found to be excellent (such as Etekcity, about $\\\$10$ ). Also electronic immersion ( not for oven) are good to 0.1 F for less than $\\\$10$ ; great for fudge ,etc. I use both types for aquariums as the pet shop alcohol thermometers are worthless.


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Well I recently purchased a Flir C5 Thermography camera. I have worked in predictictive maintenance for many years. There are many tools ranging from $300.00 up which will come in handy and save you time and money and can be used should you choose to in construction,maintenance,engineering, automotive and more. You can possibly save more money on less ...


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This is the essence of the ASME Boiler Code ;allowable stresses for materials at various temperatures. It is NOT a calculation . It is based on a great many creep and stress rupture tests which have been analyzed and reviewed for over a hundred years.If you are building a pressure vessel in the civilized world ,it is required to conform to "code" , ...


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Did you ever get a real answer to your question? I have been considering this question for years and I have no real answer. Many responses I see show me that people are a bit confused as to what you are trying to do. In a simplistic explanation you are trying to move thermal energy from a 70 degree environment into a say 75 degree environment which is very ...


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