Some usual parameters measured are&colon; displacement, daylight intake, humidification/dehumidification, heat dissipation, airflow, permeability and cooling. Indirect solar desalination by a form of humidification/dehumidification is in use in the seawater greenhouse. Dehumidification (air drying) in an air conditioning system is provided by the evaporator. There is a separate system to provide air for ventilation, dehumidification, and potentially additionally cooling. Dehumidification of ventilation and makeup air consumes a great deal of energy worldwide. All trains have over-head air-conditioning systems to provide ventilation, dehumidification and comfortable temperature control. Heat is primarily supplied by an integral dehumidification unit which also serves to remove humidity. Dehumidification of humid air infiltration can waste significant energy. Many portable air conditioners come with heat as well as dehumidification function. Moisture Removal Efficiency (MRE) is a measure of the energy efficiency of any dehumidification process. Dehumidification kilns are very similar to conventional kilns in basic construction. A variety of kiln technologies exist today&colon; conventional, dehumidification, solar, vacuum and radio frequency. Receives no maintenance except ships on donation hold, which undergo dehumidification and cathodic protection. Such water production may take place as a by-product, possibly unwanted, of dehumidification.