What role do the ASTM Standards play in specifying the materials?
ASTM has various committees that evaluate the materials based upon the wide experiences the committee members have. They also give a specific number to the material.
How do ASME specification numbers for different materials and alloys differ from those given by the ASTM?
ASME prefixes an S, e.g., SA202. It generally indicates that the material A202 specified by the ASTM has been adopted by the ASME Code, although it may not be true in all cases. Not all ASTM specified materials adopted by the ASME Code.
Types of Hot Water Systems
The basic setup of a solar hot water system includes:
- solar collectors;
- storage tank;
- various control devices;
- network of piping.
Indirect heating systems circulate water or fluid through a continuous pipe loop and transfer heat via a heat exchanger.
Direct heating systems run fresh water through the collector’s piping and into the home for direct use.
Hot water heating systems can be also defined by their means of circulation:
1. Active heating systems use an electric pump to move the water or fluid mechanically.
2. Passive heating systems move water without the use of pumps. As the water in the collector heats up, it rises up into a storage tank while cold water refills the collector tubes.
Solar heating systems for domestic heating needs may include a separate storage tank that feeds preheated water into a standard tank-style hot water heater or a tankless on-demand water heater. That way it’s easier to boost the temperature of the water for use, as needed. In other systems, solar-heated water is fed directly into a single hot water tank, which typically contains its own conventional heat source.
- solar collectors;
- storage tank;
- various control devices;
- network of piping.
Indirect heating systems circulate water or fluid through a continuous pipe loop and transfer heat via a heat exchanger.
Direct heating systems run fresh water through the collector’s piping and into the home for direct use.
Hot water heating systems can be also defined by their means of circulation:
1. Active heating systems use an electric pump to move the water or fluid mechanically.
2. Passive heating systems move water without the use of pumps. As the water in the collector heats up, it rises up into a storage tank while cold water refills the collector tubes.
Solar heating systems for domestic heating needs may include a separate storage tank that feeds preheated water into a standard tank-style hot water heater or a tankless on-demand water heater. That way it’s easier to boost the temperature of the water for use, as needed. In other systems, solar-heated water is fed directly into a single hot water tank, which typically contains its own conventional heat source.
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