Mastering Calculations in HVAC Systems — Lesson 4

This lesson covers the detailed explanation of various problems related to air conditioning systems, evaporative coolers, and cooling towers. The instructor discusses the principles of mass and energy conservation, and how they apply to these systems. The lesson also explains how to calculate the mass flow rate of air, the rate of heat transfer, and the rate of water addition in these systems. For instance, in an air conditioning system, the instructor explains how to calculate the rate of dry air, temperature, and relative humidity at the exit of the heating section. The lesson also includes the use of steam tables and psychrometric charts to solve problems.

Video Highlights

02:06 - Calculation of the temperature and relative humidity at the exit of the heating section
07:00 - Calculation of the rate of heat transfer in the humidification section
15:06 - Calculation of the heat addition in the heating section
24:23 - Calculation of the mass flow rate of the air in the evaporative cooler
30:37 - Calculation of the energy conservation in the evaporative cooler

Key Takeaways

- An air conditioning system operates at a total pressure of one bar and consists of a sensible heating section and a humidification section.
- The rate of dry air, temperature, and relative humidity at the exit of the heating section can be calculated using specific formulas.
- The rate of heat transfer and the rate of water addition in the heating section are crucial aspects of the system's operation.
- The mass flow rate of water and the specific humidity can be calculated to understand the system's efficiency.