ANSI/AHRI 640:2005 pdf download.Performance Rating of Commercial and Industrial Humidifiers.
3.1.1.3 Ulirasonk Ato,ni.-er. A piezoelectric transducer immersed in a reservoir of mineral free rater. The transducer converts a high-frequency electronic signal into a high-frequency mechanical oscillation. The mechanical oscillation is directed at the surface of the water, where at very high frequencies it creates a fine mist.
3.1.2 I)irect injection Steam FIun,idi,fiers, A type of Humidifier intended for duct applications in which steam. watervapor under pressure and at high temperature. is dispersed directly into the air.
a. Steam Cup Type. Utilizes a cup and drain mounted beneath the duct. Steam is injected into the sides of a cup allowing most of the moisture of the steam to enter into the air while permitting the condensate to fall into the cup by gravity and into the steam trap.
b. Steam Se,iarutor Tpe. Utilizes an enclosed distribution pipe. a separating chamber, an integral control valve, and a drain to distribute steam into the air, Steam is injected directly into the enclosed distribution pipe providing reheat to the outgoing steam passing through the distributor pipe before being released into the air. The steam then enters the separating chamber which allows dry steam to pass through the control valve and into the distributor pipe while allowing condensate to fall by gravity into the drain. The moisture of the steam is reheated while in the distributor pipe before being dispersed into the air.
e. Steam Panel Tpe. Utilizes an integral control valve, a header with multiple distributor pipes, and a drain. The control valve regulates the amount of steam that is injected into the header, which allows dry steam to pass into the distributor pipe(s) while allowing condensate to escape through the drain. The moisture of the steam in the distributor pipe(s) is dispersed into the air.
3.1.3 Heated Tank Humidifiers. A type of Humidifier which converts tank water to steam using electricity. gas. or steam. The steam is dispersed into a duct system through dispersion manifolds. Tithe Humidifier is a free standing unit, the steam is dispersed directly into the air space through a fan unit.
a. Electrode Type. Utilizes an electric current passing through the water to create heat energy to produce steam.
b. Gas Heated Type. Utilizes natural gas or propane as the heating method to convert water to atmospheric steam.
c. Infrared Type. Utilizes one or more radiant heat bulbs to create heat energy to produce steam.
d. Resistance Type. Utilizes one or more electrical elements to heat the water directly to produce steam.
e. Steam-to-Steam Type. Utilizes steam from a central boiler passing through a heat exchanger submersed in water to
create heat energy to produce steam.
f. Hot Water Type. Utilizes hot water from a central boiler passing through a heat exchanger submersed in water to
create heat energy to produce steam.
3.2 Humidification ‘apucirv. The capacity associated with a Humidifier’s ability to add moisture to air expressed in IMi (kwhI of continuous operation.
3.3 Published Razing. A statement of the assigned values of those performance characteristics, under stated Rating Conditions. by which a unit may be chosen to lit its application. These values apply to all units of like nominal size and type (identification) produced by the same manufacturer. The term Published Rating includes the rating of all performance characteristics shown on the unit or published in specifications, advertising or other literature controlled by the manufacturer, at stated Rating Conditions.
3.3.1 Applicasio,i Rating. A rating based on tests performed at application Rating Conditions (other than Standard Rating Conditions).
3.3.2 Standard Rating. A rating based on tests performed at Standard Rating Conditions.
3.4 Razing C’ondiiions. Any set ofoperating conditions under which a single level of performance results and which causes only that level of perfonnanee to occur.
3.4.1 Standard Rating conditions. Rating Conditions used as the basis of comparison for performance characteristics.
3.5 “Shall” or “Should’“Shall’ or “should” shall be interpreted as follows:
3.5.1 Shall. Where “shall” or ‘shall not is used for a provision specified, the provision is mandatory ifcompliance with the standard is claimed.
3.5.2. Should. “Should is used to indicate provisions which are not mandatory but which are desirable as good practice.
