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3. TESTING AND MEASUREMENTS

3.1 Humidification rate. Determine the humidification rate, Hm, of the humidifier under test, in gallons per day, according to the methods and calculations specified in sections A5 and A6 of ARI 610-74.

3.2 Input power. Measure the input power (P) to the humidifier, in watts, when the humidifier is operating under full load conditions.

3.3 By-pass air flow rate determination for by-pass humidifiers. The air flow rate through the by-pass humidifier (V) shall be measured in cubic feet per minute using air flow nozzles in accordance with Figure Al described in paragraph A3.3.1 and static pressure taps in accordance with paragraph A3.3.2 of ARI 610-74.

The humidifier shall be mounted to a plenum attached to the outlet of a fan capable of delivering the required air flow for the conditions of the test in accordance with 6 of this Appendix. The by-pass duct of the humidifier shall be connected to the inlet of the air measuring duct (AMD). The temperature of the air shall be room temperature, 70° F +10° F, 30 percent relative humidity, and the static pressure in the duct between the fan and humidifier shall be adjusted to 0.2 in. water differential. The pressure drop across the nozzle shall be recorded and the air volume calculated using the equations of A6.1.1 and A6.1.2 of ARI 610-74.

3.4 Temperature measurement. The temperature of the water entering the humidifier shall be maintained at 60° F ±2° F. The waste water temperature from the humidifier shall be measured and recorded. No less than five sets of readings shall be taken.

4. CALCULATION OF DERIVED RESULTS FROM TEST MEASUREMENTS

4.1 Average annual electric furnace or electric resistance heating energy consumption. Calculate the average annual electric furnace or electric resistance heating energy consumption, E-, expressed in kilowatthours per year, to vaporize water to maintain a room relative humidity of 30 percent at a room temperature of 70° F, and defined

as:

EF-R=(Qo+Qu-3412Es/SPFE) (1/3412),

where

Q. average annual energy output of the humidifier in terms of heat of vaporization, in Btu's,

= [N× Hm(8.34 × 1060)/24],

where N=700 hours per year for units with humidistats, or 1600 hours per year for units without humidistats, the representative average-use cycle of humidifier operation

H=humidification rate determined in accordance with 3.1 of this Appendix, in gallons per day

8.34 conversion factor to convert gallons of water to pounds of water

1060 heat of vaporization of water in Btu's per pound (Based on a water temperature of 60° F).

24 conversion factor to convert days to hours

SPF 1.0, seasonal performance factor of electric furnace or electric resistance heating dimensionless

Qw= -average annual energy lost in waste water from the humidifier housing or sump, in Btu's per year, =Nxqw,

where

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W=measured waste water drainoff rate, in pounds per hour, consisting of the water quantity determined in accordance with section A5.6.2.4 of ARI 61074, over the time period of the test. C-1, specific heat of water, in Btu's per pound-degree Fahrenheit

At waste water temperature rise, in degrees Fahrenheit tout-60° F

3412 conversion factor to convert kilowatt-hours to Btu's

E, as defined in 4.2 of this Appendix.

4.2 Average annual supplementary electrical energy consumption. Calculate the average annual supplementary electrical energy consumption, Es, expressed in kilowatt-hours per year, and defined as:

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5. Regional factors for adjusting the humidity loads of the respectiv region:

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5.3

III

1.0

Alaska

VI

2.5

5.4

IV

1.5

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Hawaii

0

0.0

5.6

VI

2.5

Territories 0

0.0

6. Installation of by-pass humidifiers

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(a)

Refer to AMCA Standard 210, Figure 1.2 for Details -

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[42 FR 27898, June 1, 1977. Redesignated and amended at 44 FR 37938, June 29, 1979]

APPENDIX K2 TO SUBPART B OF PART 430-UNIFORM TEST METHOD FOR MEASURING THE ENERGY CONSUMPTION OF ROOM HUMIDIFIERS

1. DEFINITIONS

1.1 "AHAM" means the Association of Home Appliance Manufacturers.

1.2 "AHAM HU-1-72" means the test standard published by the AHAM, titled "Appliance Humidifiers" American National Standard Z235.1-1972, and designated as AHAM HU-1-72.

1.3 "Humidification rate" a measure of the ability of a humidifier to add moisture to its surrounding atmosphere expressed as the number of gallons of water evaporated per 24 hours of continuous operation.

1.4 "Seasonal performance factor" means the ratio of the seasonal energy output of a heating system delivered to the conditioned space, in Btu's, divided by the seasonal energy input to the heating system, in Btu's.

1.5 "Humidification power" means the power, in kilowatts, required to vaporize water at the humidification rate.

1.6 "Humidistat" means a device which requires no user intervention and which is used to enable a humidifier to maintain a constant relative humidity of the conditioned air.

2. TEST CONDITIONS

2.1 Installation. Install the humidifier according to manufacturer's instructions and in accordance with sections 5.2 and 5.3 of AHAM HU-1-72. In the event of a conflict between the manufacturer's instructions and AHAM HU-1-72, the provision of AHAM HU-1-72 shall control.

2.2 Energy flow instrumentation. Install energy flow instrumentation in accordance with section 5.1 of AHAM HU-1-72. A watthour meter shall be installed in the electrical circuit when a humidifier is connected to an electrical supply circuit. The watt-hour meter shall not have an error greater than 1 percent with the smallest scale division not greater than 1 watt-hour.

2.3 Temperature instrumentation. Use mercury-in-glass thermometers accurate to within 0.1° F to measure wet bulb, dry bulb, and water reservoir temperatures. The smallest graduation on the thermometers shall not be greater than 0.2° F.

2.4 Air pressure instrumentation. Use an air pressure measurement instrument accurate to within 0.1 inch of mercury.

2.5 Time instrumentation. Use time instrumentation in acordance with section 5.1.4 of AHAM HU-1-72.

2.6 Weight instrumentation. Use weight instrumentation in accordance with section 5.1.5 of AHAM HU-1-72.

3. TEST PROCEDURES AND MEASUREMENTS

3.1 Humidification rate. Determine the humidification rate, Q, of the humidifier under test, in gallons per day, according to the methods and calculations specified in sections 5.2 and 6 of AHAM HU-1-72.

3.2 Input power. Connect the humidifier through a watt-hour meter in accordance with section 2.2 of this Appendix. Humidifiers with electric heaters shall be run with heaters on and humidity controls set at maximum levels. Measure the total electrical energy consumption, in watt-hours, at the end of the two hour test period. Calculate the input power to the humidifier, P, in kilowatts by dividing the two hour energy consumption measured in the test by 2 to obtain watts and then by 1000 to obtain kilowatt.

3.3 Barometric Pressure. Humidification rate shall be measured when barometric pressure is within the range of 29.9 inches (+1) of mercury.

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