Understanding Kidney Stone Disease. Welcome. Stone disease is a painful and common condition that affects more than 5% of all adults in the US.1 Itâs estimated that nearly 2 million patients visit their doctors or local emergency rooms because of kidney stones every year.2. If youâve experienced a kidney stone, you know just how unpleasant a stone episode can be.
In fact, the characterizations active and passive do not refer to the performance of the respective systems but they describe the technical means which are applied in each case. Passive use of solar energy can be as effective as, or even better than active use of solar energy. Moreover, because of lacking mechanical devices and the absence of auxiliary energy, passive systems have the chance to be more economic.
Passive solar heating is used in conjunction with passive shading, which allows maximum winter solar gain and prevents summer overheating. This is most simply achieved with northerly orientation of appropriate areas of glass and well-designed eaves overhangs (see Orientation; Shading).