small modular reactors and the role of heat exchangers
Small Modular Reactors (SMRs) are similar to standard nuclear water-cooled power station reactors which use nuclear fission to generate low-carbon electricity. Not only are they smaller, their components can be manufactured off site and then transported, assembled and installed wherever needed.
Small modular reactors (SMRs) are gaining momentum in the nuclear energy industry due to their scalability, lower capital costs, and safety. Their modular nature helps reduce the cost and time of construction as well as providing deployment flexibility. They are capable of supplying heat for industrial applications and hydrogen production.
In an SMR, heat exchangers are responsible for transferring the thermal energy generated by the nuclear reaction to water or gas which then drives a turbine and so generates electricity with near-zero emissions. The efficient transfer of heat between the reactor core and the water or gas is crucial for the performance and safety of the system.
how heat exchangers work in a nuclear reactor
• Heat generated from nuclear fission in the reactor core heats coolant.
• The heated coolant is pumped into the primary side of the heat exchanger through chemically etched channels.
• Heat from the primary coolant loop is transferred to the secondary coolant loop, turning its coolant to steam.
• The steam turns an electric generator to produce electricity.
• The secondary coolant cycles back to the heat exchanger so it can be reheated and the process continues repeatedly.
advantages of SMR heat exchangers
Heat exchangers used in small modular reactors offer several advantages over traditional large-scale nuclear reactors. Due to their reduced size, SMRs require heat exchangers with a smaller footprint, leading to more compact and efficient designs offered by plate heat exchangers and PCHEs.
Because they are modular, SMRs are ideal for the integration of heat exchangers, which can be scaled up or down depending on required power output. Sophisticated heat exchanger designs can also enhance safety by reducing the potential for leaks, improving passive cooling capabilities, and allowing for better control over temperature and pressure levels within the reactor system.
design optimisation
Chemical etching is an efficient way to produce large volumes of channels that can be bonded to create a contiguous block with high porosity. We can produce complex designs, with a precision as low as 10μm and with a low tooling cost. The process significantly reduces limitations on channels, ridgetops, headers, collectors and port features. Etching removes mechanical or thermal stress and leaves no compound planarity. Almost any metal can be used, even highly corrosion-resistant ones.
Our specialist engineers elevate a heat exchanger design with their knowledge and experience around key factors such as the choice of material to withstand high temperatures, pressures, and corrosive environments. It is essential to address thermal conductivity, strength, corrosion resistance, weight as well as thickness of material. In addition, thermal efficiency and optimisation are complex challenges, requiring careful consideration of factors such as fluid dynamics and heat transfer coefficients.
