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Question by jp: What mass of storage rock is needed to provide this amount of heat ?
A solar heated house loses about 6 x107 cal through its outer surfaces on a typical 24 hours winter day. What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 68 degrees C by solar collectors and the house is maintained at 22 degrees C? (Specific heat of rocks is 0.21 cal/g-0C)
_kg

Best answer:

Answer by Ivan A
The rock will eventually cool down to 22 degrees, releasing an amount of energy given by

q = (0.21) (68-22) = 9.66 cal/g

So, the heat loss by the house needs to be provided by the rock, then the mass of the rock is

mass of rock = 6E7/9.66 = 6200 kg = 6.2 metric tons!

Add your own answer in the comments!

Today, radon is widely recognized as a serious indoor air pollutant -a radioactive gas with proven carcinogenic qualities that emanates from soil and rock everywhere on earth. From a human health standpoint, radon is a potential hazard when it accumulates in high concentrations inside homes and commercial buildings. Fortunately, we have reliable ways to measure radon levels in buildings.

Granite is definitely a tough and sturdy rock, however it can be damaged. When the scrapes are extremely deep, the only method to take them off is as simple as abrasion — milling them. The thought of milling your own stunning granite counter tops may be scary, and when you aren’t confident with your personal abilities in this area, it may be a good idea to hire an expert.

When we are considering attic insulation, there are several factors that we should keep in mind. There are two main types of blow in attic insulation. These two are most commonly used. They are cellulose and fiberglass insulation. Also there is the blow in rock wool insulation but the use of it is not so common.

It’s amazing how many companies are out here willing to clean your home for rock bottom prices.

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Don’t Just Choose Anyone To Clean Your Home