Heat exchanger, cooling systems

H System Pipeline Heat exchanger Cooling system (cooling towers) Hydrants... 

Wastage is pronounced in equipment contacting high-pH fluids. Chemical process equipment, heat exchangers, water-cooled process reactors, valving, transfer pipes, and heating and cooling systems are often affected. 

The system is mounted on two mobile trailers. The first trailer contains a rotary kiln in which soil is heated to 300 to 600°F. The off-gas is ducted from the rotary kiln to a cyclone separator where relatively coarse matter is removed and a heat exchanger cools the gas to about 400°F. The cooled off-gas goes to the baghouse, which filters relatively fine particles from the off-gas stream. The final unit is an afterburner or fume incinerator that heats the contaminated air to approximately 1800°F to destroy the contaminants. 

Another type is the shell- and tube-arrangement. In Fig. 4.3-23 an example with a combined inlet- and outlet chamber is shown, which is designed as a high-pressure vessel. One end of this vessel is the tube plate into which the hair-pin tubes are welded. The lower-pressure side could be connected to a low-pressure heating or cooling system. A further apparatus is the multi-tube hair-pin heat exchanger presented in Fig. 4.3-24. 

Sterilization by chemical methods. Biocidal action has been widely used for many years to control biofilm formation in closed systems, such as heat exchangers, cooling towers, and storage tanks.64, (Dexter)5... 

Heating and cooling system mechanics install, maintain, and repair refrigeration and heating equipment in homes and in industry. They must understand how heat is exchanged by means of exothermic and endothermic processes. They must be able to read blueprints and use a wide range of tools, from pipe cutters to computerized diagnostic devices. 

The fluid properties for the three processes may be considerably different. The CCC process uses a low pH solution (containing water and the acid product) whereas both DCL and FTS use hydrocarbon like liquids. Physical properties such as surface tension, viscosity, specific heat and thermal conductivity for these two cases may be quite different. Since the FTS is a very energetic process, the reactor may also contain some internals such as heat exchangers (cooling coils) etc. Some physical and thermal properties for these systems are outlined in Table 2. 

Residual heat removal system (RHR) - active pump and heat exchanger - cooling rated reactor to 52C within 20h... 

The RHR system heat exchangers are also available to supplement the fuel pool cooling heat exchangers. RHR system heat exchangers are not normally required but may be needed if more than the normal number of spent fuel assemblies is stored in the pool. The system pumps and heat exchangers are located in the fuel building below the normal fuel pool water level. Heat exchangers are cooled by essential plant service water. 

The moderator system includes two 100% capacity pumps, two 50% flow capacity heat exchangers cooled by recirculated light water, and a number of control and check valves. Connections are provided for the purification, liquid poison addition, D2O collection, supply, and sampling systems. The series/parallel arrangement of the moderator system lines and valves permits the output from either pump to be cooled by both of the heat exchangers and ensures an acceptable level of moderator cooling when either of the two pumps is isolated for maintenance. Reactor power must be reduced to about 60% if one moderator heat exchanger is isolated. The primary functions of the system are to... 

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