Heat calculation for the alkaline solution heat exchanger in hydrogen production via alkaline electrolysis of water

During the production of hydrogen via alkaline water electrolysis, it is necessary to cool and exchange heat with the resulting alkaline solution. Under normal circumstances, a shell-and-tube heat exchanger can be used to achieve heat exchange between the alkaline solution and the cooling medium. When calculating the heat transfer in an alkali liquid cooling heat exchanger, the following parameters need to be considered: 1. The specific heat capacity at constant pressure of the alkali liquid. Generally, the specific heat capacity at constant pressure of a 30% sodium hydroxide (NaOH) solution is approximately 3.68 kJ/(kg·K). 2. Thermal conductivity of alkaline solutions: The thermal conductivity of a 30% sodium hydroxide (NaOH) solution is approximately 0.65 W/(m·K). 3. Heat exchange area: The formula for calculating the heat exchange area is A = Q/(U×ΔT), where A represents the effective area of the heat exchanger, Q is the amount of heat to be transferred, U is the heat transfer coefficient, and ΔT is the temperature difference. Among them, the heat transfer coefficient U depends on factors such as the flow velocity of the fluid and the material of the pipe; it generally needs to be determined based on actual conditions or by referring to data from literature. The temperature difference ΔT can then be obtained by measuring the inlet and outlet temperatures. In summary, the heat calculation for the alkaline solution heat exchanger used in the production of hydrogen via alkaline electrolysis requires taking multiple factors into account, and the specific values must be determined based on actual conditions. It is recommended that you consult with and work with a qualified professional for design purposes. -

I need flow rate, inlet and outlet temperatures, etc. Give me the parameters and I’ll do the calculations for you; you can add me as well

Hello, expert. Are there significant differences in the physical properties of potassium hydroxide and sodium hydroxide? The alkali solution I have is KOH

Hello, potassium hydroxide (KOH) and sodium hydroxide (NaOH) are two common strong bases, and their physical properties differ to some extent. Compared to sodium hydroxide, potassium hydroxide has a lower density, a higher specific heat capacity, as well as higher melting and boiling points. The specific parameters can be found in the table below: | Property | KOH | NaOH | | ----------- | ---------- | ---------- | | Molecular weight | 56.11 g/mol | 40.00 g/mol | | Density | 2.044 g/cm³ | 2.130 g/cm³ | | Specific heat capacity | 0.757 J/g·K | 1.229 J/g·K | | Melting point | 380°C | 318°C | | Boiling point | 1,327°C | 1,388°C | Therefore, when designing coolers for alkaline solutions, it is necessary to carry out parameter calculations and select the appropriate cooling equipment based on the actual alkaline solution being used. -

Can a heat exchanger be brazed with copper?