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GB 21519-2008: Minimum allowable values of energy efficiency and energy efficiency grades for electrical storage water heaters
GB 21519-2008
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.010
F 01
Minimum Allowable Values of Energy Efficiency and
Energy Efficiency Grades for Electrical Storage Water
Heaters
ISSUED ON: APRIL 01, 2008
IMPLEMENTED ON: NOVEMBER 01, 2008
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Technical Requirements ... 5
5 Test Methods ... 6
6 Inspection Rules ... 15
Minimum Allowable Values of Energy Efficiency and
Energy Efficiency Grades for Electrical Storage Water
Heaters
1 Scope
This Standard specifies the minimum allowable value of energy efficiency, evaluating
value of energy conservation, grade of energy efficiency, test methods and inspection
rules for the domestic and similar electrical storage water heater (hereinafter referred
to as electrical water heater).
This Standard is applicable to the electrical storage water heater.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 20289-2006 Electrical Storage Water Heater
3 Terms and Definitions
For the purposes of this Standard, the terms and definitions given in GB/T 20289-2006
and the following apply.
3.1 Minimum allowable values of energy efficiency for electrical storage water
heaters
According to the test conditions specified by the standard, the maximum 24h natural
energy consumption coefficient and the minimum hot water output rate allowed by the
electrical water heater.
3.2 Evaluating values of energy conservation for electrical storage water heaters
heater to be tested and the tested corner or the position about 1m from the
electrical water heater to be tested, whichever is smaller; and locate in half height
of the electrical water heater to be tested. The ambient temperature shall be
measured under the stable conditions.
c) The relative humidity shall not exceed 85%, and measured under stable
conditions. It shall not be taken at the moment when the hot water is discharged
from the electrical water heater.
d) It shall be carried out under the rated output power of the electrical water heater
to be tested; the deviation shall not exceed ±5%.
e) Influent temperature shall be maintained at 15°C±2°C.
f) Make the electrical water heater in normal installation and use conditions. For the
electrical water heater with outlet opened, turn off the water inlet valve of the
electrical water heater. For the closed electrical water heater, the water pressure
when the water is not drained during the test shall be stable between 0.28MPa
and the rated pressure of the electrical water heater; the fluctuation is within the
range of ±0.05MPa.
5.1.2 Instrument for test
a) The instrument for electrical measurement shall have an accuracy of no less than
±0.5%;
b) The instrument for temperature measurement shall have an accuracy within 0.5K;
c) The instrument for time measurement shall have an accuracy of ±1s/h;
d) The instrument for humidity measurement shall have any accuracy of ±1%;
e) The instrument for energy consumption measurement shall have an accuracy of
0.01kW•h.
5.1.3 Installation of electrical water heater
The electrical water heater to be tested shall be installed in accordance with the
instruments provided by the manufacturer. If the accessory is attached to the machine.
When installing, the accessory attached to the machine shall be used and install the
accessory.
The wall-mounted electrical water heater shall be installed in the space of the obstacle-
free or partition wall or partition plate of the test corner wall. The partition wall or
partition plate shall be at least 150mm from the wall; at least 250mm distance from the
top and bottom; and at least 700mm space shall be left from the front and two sides.
The electrical water heater used on the ground shall be installed on the floor; or
installed on a similar floor or bracket for the benefit of the test; it shall be as close to
the two side walls of the test corner wall.
The flush-mounted electrical water heater shall be installed in place according to the
manufacturer’s instructions.
Installation of the inlet and outlet pipes: connect the necessary accessories (such as
safety valves, etc.) according to the manufacturer’s instructions. The connecting pipes
and valves that are not provided by the manufacturer shall use the non-metal parts; if
the metal parts are used, certain insulation measures need to be added (equivalent to
non-metallic pipe materials).
5.2 Test method for capacity
The electrical water heater to be tested shall be filled with water in the manner of
normal use (for the closed electrical water heater, the specified water pressure shall
be applied); The mass of the electrical water heater without water shall be subtracted
from the mass of electrical water heater filled with water; and the result shall be divided
by the density of water at the measured temperature to obtain the actually-measured
capacity, C, of the electrical water heater, in L; accurate to 0.1L.
5.3 Test of 24h natural energy consumption
5.3.1 Selection of test points
5.3.1.1 For container with good heat transmissivity
a) Selection of single container test points
Before the test, the appropriate hole is pre-punched at the position of the test
point of the container; clean up; so that it shall not affect the temperature
measurement effect. The thermocouple is tightly attached to the outer surface of
the container; each electrical water heater to be tested is placed with a 5-point
thermocouple; as shown in Figures 1 and 2. After the arrangement is completed,
use the materials with equivalently original insulation effect to fill and prevent the
heat dissipation.
b) Selection of double container test points
The two containers of the double container shall select and arrange the test
points as per 5.3.1.1 a) totally place 10 thermocouples.
The electrical water heater to be tested shall be injected with water at a temperature
of (15±2) °C according to the normal mode. Unless otherwise specified in the
instructions, for the closed electrical water heater, turn off the water outlet valve, turn
on the water inlet valve, and operate and energize at the rated power. Adjust the
thermostat of the electrical water heater to a certain temperature; so that the electrical
water heater is periodically operating under the state of connecting, disconnecting, and
connecting till when the stable state is established, the averaged water storage
temperature for undraining, θM, is within the range of (65±3) °C. If a process can’t be
satisfied, adjust the thermostat; properly fill with water; start to operate; repeat the test
till the temperature, θM, meets the requirements.
For the electrical water heater whose thermostat can’t be adjusted, then it can
externally equip with adjustable thermostat to satisfy the average water storage
temperature for undraining, θM, i...