# Tag Info

Accepted

### Why railroad concrete tie tips become dry first after a rain?

Figure 1. A concrete sleeper mould with reinforcing steel. Concrete sleepers are reinforced with pre-stressed steel. Image source: BFT-International. The sleepers will act as heat sinks during the day ...
• 10.9k
Accepted

### Identify this textbook

Thermal Environmental Engineering 3rd Edition by Kuehn, Ramsey & Threlkeld (1998), Pearson.
• 2,477
Accepted

### Does a house heating system affect perceived and true indoor air humidity?

Your last statement is basically correct: Another possible explanation is that the higher air temperature increases the air's water carrying capacity, which in the absence of an abundant water ...
• 1,991

### How to increase temperature in a wooden box up to 350 degrees F?

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. ...
• 7,287

### Does a house heating system affect perceived and true indoor air humidity?

To summarize the comments given here: During the winter, the cold air outside can hold only a small amount of water in solution, which means it takes very little moisture in cold air to get it to 100% ...
• 15.1k

### What is a formula to approximate the change in relative humidity cause by a change in temp?

I think you can solve this problem by going from relative humidity to absolute moisture content and back; the only property that we want to change is the temperature. However, we have to make a choice ...
• 121
1 vote

### what is effect of temperature on dew point?

I read that relative humidity changes with change in temperature though there can be constant humidity. If you are referring to that Wikipedia article you reference, what they mean is that for a ...
• 2,692
1 vote

### what is effect of temperature on dew point?

Specific humidity is the amount of water in air, normally g/kg (grains of moisture per pound often in the US). This doesn't change with temperature. What changes is air's ability to hold more moisture ...
• 7,074
1 vote
Accepted

### Why don't air dehumidifiers use coalescing filters?

A coalescing filter separates liquids from gasses. You need a mist or droplets for it to work. There are dehumidifiers that work on compression, coalescing, expansion (some with energy recovery), but ...
• 4,850
1 vote

### Dehumidification calculations

you're on the right track (I didn't check your numbers but the method is sound), except: your energy. Expect at least a 3 to 1 gain of a refrigeration system - you can move more energy than what ...
• 7,074
1 vote

### Why railroad concrete tie tips become dry first after a rain?

They have collected heat during the day . And being solid they conduct heat better than the loose gravel. So they collect more heat and when cool the heat is conducted back to the surface better than ...
• 6,162
1 vote

### What is a formula to approximate the change in relative humidity cause by a change in temp?

The formula for relative humidity is the saturation vapor pressure at the dew point divided by the saturation vapor pressure at the ambient temperature. The formula for saturation vapor pressure is: =...
• 335

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