Domestic Hot Water Recirculation In High Rise Buildings

If a single high head pump is used there will be a balance problem.

Domestic hot water recirculation in high rise buildings. Recirculating hot water systems are not quite that old. Domestic hot water hot water recirculation plumbing pumps and piping recirculation series pressure reducing valves reducing high pressure supply water recirculation systems in highrise buildings designing a recirculation system prvs and recirculation systems creating separate pressure zones domestic hot water recirculation. Van der schee 1 1 w g vd schee wolterendros nl abstract this paper is based on the study and gives a brief summery of the report water systems in high rise residential buildings guide lines for design and construction. Domestic hot water hot water recirculation plumbing pumps and piping recirculation series multiple riser recirculation systems balancing multiple risers automatic flow control lead free requirements standard nsf 64 sizing a recirculation pump recirculation pipe size vertical lifts and heat losses hot water recirculation.

Water supply in high rise buildings 2 duration. Domestic hot water recirculation in high rise buildings caleffi hydronic solutions. A typical 26 story high rise building may have three recirculation pumps and hot water heaters at the top of the building in a down feed style supply. Domestic hot water systems have been installed in buildings for many years dating back to ancient times.

Domestic hot water recirculation steps. Part 1 find the pump gpm determine the heat loss of the total supply pipe using tables or rules of thumb. Gravity hot water circulation began in the u s. Compare that to gpm times the number of balance valves and choose the larger value.

Water is boosted from the basement to the top of the building and in the illustration shown in figure 2 pressure of 38 psi must be maintained at the top. However constant pumping increases energy consumption by exposing supply and return line piping to continuous heat loss even absent the demand for hot water. When natural gas is the preferred source of energy for domestic water heating in high rise buildings the static pressure of the proposed hot water distribution system will exceed the maximum relief valve pressure setting of 150 psi for the listed t ps required at the water heating equipment. One design shown here has a pump for each zone.

In the late 1870s right after plumbing moved indoors. Ii 2 water systems in high rise residential buildings guide lines for design and construction w g. Calculate the gpm required using a 10 f δt or other value as determined by the engineer.