BUTUAN CITY - The Butuan City Water District (BCWD) announced on Saturday that an eight-hour night flushing activity will take place in some parts in this region's premier and capital city on Sunday and Monday.
In an advisory released by the Butuan City Public Information Office (PIO), BCWD said the night flushing activity will be undertaken from 8 p.m.
Actual site measurement during the summer of 2013 showed that, while outside temperatures rose to 105[degrees]F (41[degrees]C), interior temperatures hovered around 77[degrees]F (25[degrees]C) and only varied [+ or -] 1[degrees]F to 2[degrees]F (0.6[degrees]C to 1.1[degrees]C), other than during night flushing (Figure 1).
During the temperature and energy modeling, it was noticed that the night flushing fans operated for only 4 to 5 hours to fully charge the thermal mass in the building.
This strategy is called night ventilation or night flushing
. This means allowing the night air to cool down the structure of a house or building by flushing warm air out and cooling the thermal mass for the next day.
Improving and extending the comfort range by night flushing
the building to store "coolth" in the wall and floor slabs, and depressing the mean radiant temperature has been initially an untested experiment.