Outside air ventilation in the crawlspace - realization
As it was described in the Temperature control section, auxiliary temperature regulation occurs by outside air ventilation.
Automatic air ventilation occurs from outside to inside in the crawlspace through wall openings forced by fans. Air directed according to the outside and inside temperature.
This concept realized at an existing house in the following way:
The opening of the crawlspace at the southern side of the house.
A fitting old dog cage was used to contain and hold the pieces of equipment. Vinyl decoration strips were used to close the opening automatically for airflow when the fan does not work.
A small 110-volt fan used to create the airflow. The size of the fan needs to be matched with the door of the cage.
The prepared cage placed in the crawlspace opening. A small temperature sensor was placed in the airflow in front of the fan. The temperature sensor is connected to an automatic temperature controller.
When the fan is working, it can be seen how the airflow opens the strips let the air go inside to the crawlspace. It can be seen, that the airflow created pressure automatically closes the strips around and do not allow the blew-in air to come out.
A shade is used to protect the pieces of equipment from the direct sunlight and for the measurement of the accurate air temperature.
An old transparent plexy door is used to create a greenhouse for enhancing the efficiency of the process. The air coming in at the lower left side of the door.
Bought pieces of equipment:
Honeywell HT-900 TurboForce Air Circulator Fan link
DIGITEN Digital Pre-wired Temperature Controller link
DIGOO 3 Channels Digital In&Outdoor thermometer link (optional)
The equipment is on the south side of the house. In winter, it gets direct sunshine and blows warm air in the crawlspace. The temperature controller starts the fan at 20 Celsius and stops the fan at 19 Celsius at winter.
At summer, the plexy covered with a shading material. The sides and the upper edge of the cover are opened to provide efficient airflow. The temperature controller starts the fan at 20 Celsius and stops the fan at 21 Celsius. The temperature probe of the controller placed in a shaded but outside, free airflow area to measure outside air temperature
Temperature can be kept between 17 and 21 Celsius at all time. This simple set-up can reach significant energy savings on heating in winter, and on cooling at summer.
A further upgrade will use a differential temperature control, which can turn the fan on-off according to the difference between the crawlspace and the greenhouse, independently to the actual temperature.
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