66-an experimentally established value for the percent reduction in the moisture content of the test load during a laboratory test cycle expressed as a percent. FU-Field use factor. =1.18 for time termination control systems. =1.04 for automatic control systems which meet the requirements of the definitions for automatic termination controls in 1.11.1, 1.12 and 1.13. Ww-the moisture content of the wet test load as recorded in 3.4.2. Wa=the moisture content of the dry test load as recorded in 3.4.3. 4.2 Per-cycle gas dryer electrical energy consumption. Calculate the gas dryer electrical energy consumption per cycle, Ege, expressed in kilowatt-hours per cycle and defined as: Ege=[66/(Ww- Wa)]×Ete×FU Ete the energy recorded in 3.4.6.1 FU, 66, Ww, Wa as defined in 4.1 4.3 Per-cycle gas dryer gas energy consumption. Calculate the gas dryer gas energy consumption per cycle, Ege. expressed in Btu's per cycle as defined as: Egg=[66/(Ww- Wa)]×Etg×FU×GEF Eto-the energy recorded in 3.4.6.2 4.4 Per-cycle gas dryer continuously burning pilot light gas energy consumption. Calculate the gas dryer continuously burning pilot light gas energy consumption per cycle, Eup expressed in Btu's per cycle and defined as: Eup=Epg (8760-140/416)×GEF Epg=the energy recorded in 3.4.6.3 8760 number of hours in a year 416 representative average number of clothes dryer cycles in a year 140-estimated number of hours that the continuously burning pilot light is on during the operation of the clothes dryer for the representative average use cycle for clothes dryers (416 cycles per year) GEF as defined in 4.3 4.5 Total per-cycle gas dryer gas energy consumption expressed in Btu's. Calculate the total gas dryer energy consumption per cycle, E., expressed in Btu's per cycle and defined as: APPENDIX E TO SUBPART B OF PART 430-UNIFORM TEST METHOD FOR MEASURING THE ENERGY CONSUMPTION OF WATER HEATERS 1. Definitions 1.1. Cut-in means the time or water temperature when a water heater thermostat has acted to increase the energy or fuel input to the heating elements, compressor, or burner. 1.2. Cut-out means the time or water temperature when a water heater thermostat has acted to reduce to a minimum the energy or fuel input to the heating elements, compressor, or burners. 1.3. Design Power Rating means the nominal power rating that a water heater manufacturer assigns to a particular design of water heater, expressed in kilowatts or Btu per hour as appropriate. 1.4. Energy Factor means water heater overall efficiency. a measure of 1.5. First Hour Rating means the amount of hot water the water heater can supply in one hour of operation. 1.6. Heat Trap means a device which can be integrally connected, or independently attached, to the hot and/or cold water pipe connections of a water heater such that the device will develop a thermal or mechanical seal to minimize the recirculation of water due to thermal convection between the water heater tank and its connecting pipes. 1.7. Recovery Efficiency means the ratio of energy delivered to the water to the energy content of the fuel consumed by the water heater. 1.8. Standby means the time during which water is not being withdrawn from the water heater. There are two standby time intervals used within this test procedure: stby, represents the elapsed time between the time at which the maximum mean tank temperature is observed after the sixth draw and the end of the 24 hour test; suby,2 represents the total time during the 24 hour simulated use test when water was not being withdrawn from the water heater. 1.9. Gas fueled storage water heater means a water heater which utilizes gas as the energy source and which is designed to heat and store water at a thermostatically controlled temperature of less than 180 °F with an input of 75,000 Btu per hour or less and a manufacturers specified storage capacity of not less than 20 gallons nor more than 100 gallons. 1.10 Electric storage water heater means a water heater which utilizes electricity as the energy source and which is designed to heat and store water at a thermostatically controlled temperature of less than 180 °F with an input of 12 kilowatts or less and a manufacturers specified storage capacity of not less than 20 gallons nor more than 120 gallons. 1.11 Oil storage water heater means a water heater which utilizes oil as the energy source and which is designed to heat and store water at a thermostatically controlled temperature of less than 180 °F with an energy input of 105,000 Btu per hour or less, and which has a manufacturers specified storage capacity of 50 gallons or less. 1.12 Gas fueled instantaneous water heater means a water heater which utilizes gas as the energy source controlled manually or automatically by a water flow activated control or a combination of water flow and thermostatic control, which is designed to deliver water at a controlled temperature of less than 180 °F, and which has an input greater than 50,000 Btu per hour and less than 200,000 Btu per hour, and a manufacturers specified storage capacity of less than 2 gallons. 1.13 Heat pump water heater means a water heater which utilizes electricity as the energy source with a maximum current rating of 24 amperes at a voltage no greater than 250 volts, and which is designed to transfer thermal energy from one temperature level to a higher temperature level for the purpose of heating water, including all auxiliary equipment such as fans, storage tanks, pumps, or controls necessary for the device to perform its function. 1.14 ASHRAE Standard 41.1-86 means the standard published in 1986 by the American Society of Heating, Refrigerating and AirConditioning Engineers, Inc. and titled Standard Measurement Guide: Section on Temperature Measurements. 1.15. ASTM-D-2156-80 means the test standard published in 1980 by the American Society of Testing and Measurements and titled Method for Smoke Density in Flue Gases from Burning Distillate Fuels. 1.16. "Rated Storage Volume" means the water storage capacity of a water heater, in gallons, as specified by the manufacturer. 2. Test Conditions 2.1. Installation Requirements. Tests shall be performed with the water heater and instrumentation installed in accordance with section 4. 2.2. Ambient Air Temperature. The ambient air temperature, shall be controlled to a value between 65.0 °F and 70.0 °F on a continuous basis. For heat pump water heaters maintain the dry bulb temperature at 67.5 ± 1 °F. Additionally, for heat pump water heaters the relative humidity shall be maintained between 49 and 51 percent. 2.3. Supply Water Temperature. The temperature of the water being supplied to the water heater shall be maintained at 58 ± 2 °F throughout the test. 2.4. Storage Tank Temperature. The average temperature of the water within the storage tank shall be set to 135 ± 5 °F. 2.5. Supply Water Pressure. During the test when water is not being withdrawn, the supply pressure shall be maintained between 40 psig and the maximum allowable pressure specified by the water heater manufacturer. 2.6. Electrical and/or Fossil Fuel Supply. 2.6.1. Electrical. Maintain the electrical supply voltage to within ± 1 percent of the center of the voltage range specified by the water heater and/or heat pump manufacturer. 2.6.2. Natural Gas. Maintain the supply pressure in accordance with the manufacturer's specifications. If the supply pressure is not specified, maintain a supply pressure of 7 to 10 inches of water column. If the water heater is equipped with a gas appliance pressure regulator, the regulator outlet pressure shall be within ± 10% of the manufacturer's specified manifold pressure. Use natural gas with a higher heating value of approximately 1,025 Btu per standard cubic foot. 2.6.3. Propane Gas. Maintain the supply pressure in accordance with the manufacturer's specifications. If the supply pressure is not specified, maintain a supply pressure of 11 to 13 inches of water column. If the water heater is equipped with a gas appliance pressure regulator, the regulator outlet pressure shall be within ± 10% of the manufacturer's specified manifold pressure. Use propane gas with a higher heating value of approximately 2,500 Btu per standard cubic foot. 2.6.4. Fuel Oil Supply. Maintain an uninterrupted supply of fuel oil. Use fuel oil with a heating value of approximately 138,700 Btu per gallon. b. Calibrated resistance thermometers c. Precision thermometers d. Calibrated thermistors e. Calibrated thermocouples f. Quartz thermometers 3.2.5. Thermopile Construction. If a thermopile is used, it shall be made from calibrated thermocouple wire taken from a single spool. Extension wires to the recording device shall also be made from that same spool. 3.2.6. Time Constant. The time constant of the instruments used to measure the inlet and outlet water temperatures shall be no greater than 5 seconds. 3.3 Liquid Flow Measurements. The accuracy of the liquid flow rate measurement, using the calibration if furnished, shall be equal to or less than ± 1% of the measured value in mass units per unit time. 3.4. Electric Energy. The electrical energy used shall be measured with an instrument and associated readout device that are accurate within ±1% of the reading. 3.5. Fossil Fuels. The quantity of fuel used by the water heater shall be measured with an instrument and associated readout device that is accurate within ± 1% of the reading. 3.6. Mass Measurements. Mass measurements shall be made measured with instruments that are accurate within ± 1% of the reading or 0.1 lbm, whichever is greater. 3.7. Heating Value. The higher heating value of the natural gas, propane, or fuel oil shall be measured with an instrument and associated readout device that is accurate within ±1% of the reading. The heating value of natural gas and propane must be corrected for local temperature and pressure conditions. 3.8. Time. The elapsed time measurements shall be measured with an instrument that is accurate within ± 0.5 seconds per hour. 4. Installation 4.1. Water Heating Mounting. A water heater designed to be free standing shall be installed according to the manufacturer's di rections on a 4 inch thick plywood platform supported by three 2 x 4 inch runners. If the water heater is not approved for installation on combustible flooring, suitable non-combustible material shall be placed between it and the platform. For heat pump water heaters without a storage tank supplied by the manufacturer, connections shall be made with a storage tank as described in section 4.9.3 and in accordance with manufacturerpublished installation instructions. The storage tank and heat pump section shall be placed on platform(s) constructed as previously described. If installation materials are not provided by the heat pump manufacturer, use uninsulated 8 foot long connecting hoses, having an inside diameter of % inch. Wall mounted water heaters shall be installed in accordance with manufacturerpublished installation instructions on a simulated wall section made from 4 inch plywood and 2 × 4 inch studs. Placement in the test room shall be in an area protected from drafts. 4.2. Water Supply. The water supply shall be capable of delivering water at conditions as specified in section 2. 4.3. Water Inlet and Outlet Configuration. Inlet and outlet piping connections shall be configured as illustrated in Figures 1, 2, or 3 except a water heater 36 inches high or less, (commonly referred to as an under counter or table top model) intended for installation either beneath, adjacent to or in conjunction with a counter shall have the inlet and outlet connections configured as illustrated in Figures 4a and 4b. Type "L" hard copper tubing, the same size as the connections on the water heater shall be connected to the tank and extend 24 inches in length. If a water heater 36 inches high or less is not factory equipped with pipe to extend the field connection point of the water heater lines to outside of the jacket or cabinet, type "L" hard copper tubing shall be used to extend the water line horizontally to the exterior of the jacket or cabinet. Unions may be utilized to facilitate installation and removal of the piping arrangements. A pressure gauge and diaphragm expansion tank shall be installed in the supply water piping at a location upstream of the 24 inch cold water inlet pipe. An appropriately rated pressure and temperature relief valve shall be installed on all water heaters at the port specified by the manufacturer. Discharge piping for the relief valve shall be non-metallic. If heat traps and/or piping insulation and/or pressure relief valve insulation are supplied with the water heater, then they shall be installed for testing. Clearance shall be provided such that none of the piping contacts other surfaces in the test room. |