What type of test point should be installed at the inlet and outlet of any heat exchanger?

The correct option is to install pressure test points at the inlet and outlet of any heat exchanger. Pressure measurements at these points are crucial for several reasons. Firstly, heat exchangers operate under varying pressure conditions, and monitoring these pressures can help in assessing the performance and efficiency of the heat exchanger.

By checking the pressure drop across the heat exchanger, you can determine if there are blockages or fouling within the unit that could affect its operation. Understanding the pressure differential allows you to evaluate whether the unit is operating correctly or if maintenance is required.

In addition to performance monitoring, pressure data is essential for safety considerations. It helps ensure that operating pressures remain within safe limits to prevent failures or leaks, which could lead to hazardous situations.

Though temperature measurements are important in assessing thermal performance and flow measurements are vital for understanding fluid dynamics, the specific requirement for pressure test points relates directly to operational efficiency and safety in a heat exchanger system. Electrical test points are typically not relevant to the direct functioning or monitoring of heat exchangers in conventional settings.