Page images
PDF
EPUB

pass type humidifiers, in watt-hours per year

=0.365 V, XN, where Vo=by-pass flow rate determined in ac

cordance with section 3.3 of this Ap

pendix, in cubic feet per minute 0.365=furnace fan power to operate by

pass humidifier, in watts per cubic feet

per minute N as defined in 4.1.

4.3 Average annual electric heat pump energy consumption. Calculate the average annual electric heat pump energy consumption, Er-up, expressed in kilowatt-hours per year, to vaporize water to maintain a room relative humidity of 30 percent at a room temperature of 70° F, and defined as:

Er-hp=(Qo + Qu— 3412 Es/SPFHp) (1/3412), where SPFHp=1.5, seasonal performance factor of

electric heat pump, dimensionless 3412 as defined in 4.1 Qo as defined in 4.1 Qu as defined in 4.1 Es as defined in 4.2

4.4 Average annual gas furnace energy consumption. Calculate the average annual gas furnace energy consumption, Er-li, expressed in Btu's per year, to vaporize water to maintain a room relative humidity of 30 percent at a room temperature of 70° F, and defined as:

Er-o=(Qo + Qu – 3412 Es/SPF:), where SPF5=.65, seasonal performance factor of

gas furnace, dimensionless Qo as defined in 4.1 Qu as defined in 4.1 Es as defined in 4.2 3412 as defined in 4.1

4.5 Average annual oil furnace energy consumption. Calculate the average annual oil furnace energy consumption, Er-o, expressed in Btu's per year, to vaporize water to maintain a room relative humidity of 30 percent at a room temperature of 70° F, and defined as:

Er-o=(Qo+Qu-3412Es/SPF.), where SPF0=.75, seasonal performance factor of

Hmh=

oil furnaces, dimensionless

3412 as defined in 4.1
Qo as defined in 4.1
Qir as defined in 4.1
Es as defined in 4.2

4.6 Hourly humidification rate. Calculate the hourly humidification rate, Hmh, expressed in pounds per hour, and defined as:

8.34 Hm/24
where

Hm as defined in 4.1
8.34 as defined in 4.1
24 as defined in 4.1

4.7 Hourly rate of electrical energy input. Calculate the hourly rate of electrical energy input, q, expressed in Btu's per hour, and defined as:

qn = 3.412 P,
where

Pas determined in 3.2
3.412=conversion factor to convert watts

to Btu's per hour.
4.8 Hourly rate of equivalent electrical
energy input for by-pass humidifiers. Calcu-
late the hourly rate of equivalent electrical
energy input for by-pass humidifiers, go, ex-
pressed in Btu's per hour, and defined as:

qo=0.365 Vox3.412,
where
0.365 as defined in 4.2
Vo as defined in 4.2
3.412 as defined in 4.7

4.9 Hourly rate of energy output of a central system humidifier. Calculate the hourly rate of energy output of a central humidifier, H., expressed in Btu's per hour and defined as:

H,=1060 Hmih,
where

1060 as defined in 4.1.
Hmh as defined in 4.6.

4.10 Humidistat factor. For a central system humidifier with a humidistat, the humidistat factor is equal to the hourly rate of energy output, as defined in 4.9, in Btu's per hour. For a central system humidifier without a humidistat, the humidistat factor is equal to 2.29 times the hourly rate of energy output, as defined in 4.9, in Btu's per hour.

=

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

co

V

[graphic]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]

Region (from Map)

5.1

5.2

5.3

III

1.0

Alaska

VI

2.5

5.4

IV

1.5

[ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small]

6. Installation of by-pass humidifiers

Test Unit

Duct Work With at Least 1-90' Elbow

Damper (Optional)

by-Pass Humidifier

[merged small][ocr errors]

(a)

Refer to AMCA Standard 210, Figure 1.2 for Details

Straightener

[merged small][ocr errors][merged small]

APPENDIX K2 TO SUBPART B OF PART

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 heaterson 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.

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, Er-t, 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:

Ex-A=(Qo - 3412 Es/SPF:) (1/3412), where Qu= average annual energy output of the

humidifier in terms of heat of vaporization, in Btu's per year,

=NXQ X 0.93 (8.34 X 1060/24) where N=700 hours per year for units with hu

midistats, or 1600 hours per year for units without humidistats, the representative average-use cycle of humidi

fier operation. SPF 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

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.

temperature of 60° F) 24=conversion factor to convert days to

hours Q=humidification rate (water output ca

pacity) determined in accordance with section 3.1 of this Appendix, in gallons per day.

[ocr errors]
[ocr errors]

0.93=correction factor to adjust the hu

midifier output at standard conditions of 75° F and 30 percent relative humidity to normal room conditions of 70° F and 30 percent relative humidity, di

mensionless. SPFg=1.0, seasonal performance factor of

electric furnace or electric resistance

heating, dimensionless. 3412=conversion factor to convert kilo

watt-hours to Btu's. Es as defined in 4.2

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:

Es=NXP, where

N as defined in 4.1
Pas determined in 3.2

4.3 Average annual electric heat pump energy consumption. Calculate the average annual electric heat pump energy consumption, Er-ho, expressed in kilowatt-hours per year, to vaporize water to maintain a room relative humidity of 30 percent at a room temperature of 70° F, and defined as:

Er-hp=(Qo-3412Es/SPFHp) (1/3412), where SPFHp=1.5, seasonal performance factor of

electric heat pump, dimensionless. 3412 as defined in 4.1 Qo as defined in 4.1 Es as defined in 4.2

4.4 Average annual gas furnace, gas boiler, or unvented gas heater energy consumption. Calculate the average annual gas furnace, gas boiler, or unvented gas heater energy consumption, Er-li, expressed in Btu's per year, and defined as:

Ex-(=Q0-3412Es/SPFci, where SPF;=.65 seasonal performance factor of

gas furnaces, gas boilers, or unvented

gas heaters, dimensionless Qo as defined in 4.1 3412 as defined in 4.1 Es as defined in 4.2

4.5 Average annual oil furnace or oil boiler energy consumption. Calculate the average annual oil furnace energy or oil boiler consumption. Er-o, expressed in Btu's per year, to vaporize water to maintain a room relative humidity of 30 percent at a room temperature of 70° F, and defined as:

Er-o=(Q0-3412Es/SPF.), where SPF,=.75, seasonal performance factor of

oil furnaces and oil boilers, dimension

less 3412 as defined in 4.1 Qo as defined in 4.1 Es as defined in 4.2

4.6 Humidification power. Calculate the humidification power, Qi' expressed in kilowatts and defined as:

QH=(8.34 X 1060 XQ/24 x 3412)=0.107 Q where

Q as defined in 3.1 8.34 as defined in 4.1 24 as defined in 4.1 1060 as defined in 4.1 3412 as defined in 4.1

4.7 Humidistat factor. For a room humidifier with a humidistat, the humidistat factor is equal to the humidification power, as defined in 4.6, in kilowatts. For a room humidifier without a humidistat, the humidistat factor is equal to 2.29 times the humidification power, as defined in 4.6, in kilowatts.

« PreviousContinue »