Tooltip Tags: vapour

TIP: dehumidifier

Dehumidifier. Consider using a dehumidifier, see Which! Guide; such as Inventor EVA II Pro 20L R290; £179 ideally buy one with a continous function draining into a sink

TIP: drying racks

Consider buying a drying rack made for a bathroom (and persuading tenants to use it, with a vent on at least until clothes are 90% dry).

FACT: airflow restrictions

Airflow restrictions, such as furniture and objects by cold walls, reduce the benefits of warm air currents causing heat loss. Relative humiidty is a function of both vapour quantity or pressure and temperarure, therefore you can end up with damp and mould resulting from airflow restriction.

FAFT: 90% of vapour remains

90% of vapour remains in a bathroom after a shower has been switched off and the occupier left the room. That is why it is so important to keep the extractor fan running for 30 minutes. Strangely most extractor fan manufacturers set fans up with a 1 or 5 minute default and builder’s or electricaians, rarely know to change the setting. This shortcoming probably accounts for more isdiagnosed rising damp than any other cause of dampness, probably accounting for £100M of wasted economic activity in the UK every year.

FACT: dehumidifiers

Dehumidifiers are a win-win, in that energy results in reduced vapour and heat, entropy means that turning vapour into water releases additional heat – beneficial in winter. However, dehumidifiers are untargeted, the refrigerant types don’t work well in low temperatures and either need constant decanting or a drain, which is at risk of leaking.

FACT: houses contain 4 litres of water as vapour

Houses contain about 4 litres of water as vapour. A normal house typically contains 10 grams per cubic meter at 65%RH at 20°C. A 2.5M high room and foot print of a house is 150M2 = 375 x 10 = 3,750 g or 3.7 litres. (1,000 grams in a litre)