What is BS 4857-1 – Thermal and aerodynamic performance of terminal reheat units about?
Terminal reheat units are a type of air handling system that are generally used in conjunction with constant air volume (CAV) and variable air volume (VAV) systems, for efficient reheating of air in the occupied space.
BS 4857 is a British Standards that discusses the methods for testing and rating of terminal reheat units, for air distribution systems. The main aim of the BS 4857 series is to provide manufacturers with best industry testing methods to determine the performance of terminal reheat units.
BS 4857-1 is the first part of the BS 4857 series that describes methods of thermal and aerodynamic testing and rating for high pressure terminal reheat units with or without flow rate controllers. It describes the equipment required and gives instructions for the calculation, interpretation and interpolation of results.
Who is BS 4857-1 - Thermal and aerodynamic performance of terminal reheat units for?
BS 4857-1 on terminal reheat units is relevant to:
- Manufacturers of terminal reheat units
- Manufacturers of ventilation and air-conditioning systems
- Manufacturers of HVAC applications
- Mechanical engineers
- Quality control and testing authorities
Why should you use BS 4857-1 - Thermal and aerodynamic performance of terminal reheat units?
Thermodynamic and aerodynamic performance of terminal reheat units need to be assessed in order to maintain steady conversion of energy and efficient airflow through ducts.
BS 4857-1 provides best industry guidance on:
- Tests for casing leakage
- Test of constant flow rate controller characteristics
- Test for air flow pressure characteristics
- Heat transfer measurements
BS 4857-1 also covers rating examples.
As a result, if you are a manufacturer of heating applications, testing thermal and aerodynamic performance in compliance with BS 4857-1 can help determine whether your products are reliable and effective at the point of use, and thereby minimize the risk of end-application failures.
