Copyright © 2005 Heathkit Company, Inc. All Rights Reserved Automating and Integrating Residential Systems Presentation 8 – Ventilation/Furnace Simulation

2 Objectives At the end of this exercise, you will be able to:

3 Describe the difference between ventilation, heating, and cooling. Describe the operation of a typical home furnace. Explain several different ways of heating a home. Demonstrate how PLC can be used in home ventilation and furnace operations.

4 Ventilation Ventilation starts with outside air.

5 Purpose of Ventilation All homes need ventilation. Contaminants can accumulate in poorly ventilated homes.

6 Trees and shrubs help

7 Trees and shrubs can also increase the velocity of moving air.

8 ASHRAE (the American Society of Heating, Refrigerating and Air-Conditioning Engineers), says that the living area of a home should be ventilated at a rate of 0.35 air changes per hour.

9 Natural Ventilation Air enters a home through cracks and small holes (infiltration. Infiltration has become the principal mode of natural ventilation. However, this is unpredictable.

10 Whole-House Ventilation Use one or more large fans. Experts say, “seal tight, ventilate right.”

11 How a whole-house fan works

12 Spot Ventilation This uses localized exhaust fans. Spot ventilation is effective. Courtesy of R.E. Williams

13 Constant vs Intermittent Moving Air Continuously moving air. High-efficiency air distribution systems are good.

14 Improving Ventilation Efficiency Deliver Only the Air Needed

15 Use VAV Diffusers for Comfort Use local VAV diffusers for individual temperature control. Courtesy of Thermal Products Corporation

16 Increase Duct Size

17 Use Low-Face-Velocity Air Handlers

18 Don't Oversize Fans

19 Eliminate Ducting

20 Fans You can use small room fans.

21 Booster Fan This device can increase the ducted HVAC airflow into a specific room or area of a house.

22 Duct Damper Closes off air or passes air to a room or area of a home.

23 The Furnace Today’s home heating is normally done by: Forced air furnace Hot water or steam boiler Electric baseboard heaters Fireplace or stove

24 Some fuels for home heating are: Gas or oil Wood, coal, or biomass Electricity from the grid Solar, wind, or falling water to generate your own electricity

25 We Forced Air vs Radiant Heat

26 How A Furnace Works Courtesy James AC Co.

27 How A Boiler Works Courtesy Radiant Design Institute

Copyright © 2005 Heathkit Company, Inc. All Rights Reserved Automating and Integrating Residential Systems End