BS/EN 16147-2017 pdf download.Heat pumps with electrically driven compressors Testing, performance rating and requirements for marking of domestic hot water units.
In the case of heat pumps consisting of several refrigeration parts (split heat pumps) the following installation conditions shall be complied with for the tests:
a) each refrigerant line shall be installed in accordance with the manufacturer’s instructions; the length of each line shall be between 5 m and 7,5 m;
b) the lines shall be installed so that the difference in elevation does not exceed 2,5 m;
c) thermal insulation shall be applied to the lines in accordance with the manufacturer’s instructions;
d) unless constrained by the design at least half of the interconnecting lines shall be exposed to the outdoor conditions with the rest of the lines exposed to the indoor conditions.
For the test of direct exchange ground coupled heat pumps requirement d) is not valid.
For indirect systems where the heat pump is separated from the tank, water or brine connections to the tank shall be installed in accordance with the manufacturer’s instructions to the maximum stated length or S m, whichever is shorter. Piping shall be installed according to d) and with as few bends as possible and insulated according to c).
6 Settings and test conditions
6.1 General
Set points for internal control equipment of the unit such as thermostats, pressure switches or mixing valves shall be set to the values as stated in the installation and operating instructions.
If several set points or a range are stated, the manufacturer shall indicate the one to be used for the tests.
Thermostat settings and settings for auxiliary electrical heaters shall be done according to the installations and operating instructions and shall remain in the same position for the duration of the test.
If the water heater is equipped with a mixing valve for the hot water, this valve shall be set at the manufacturer’s recommended setting throughout the test.
6.2 Settings for non-ducted air source units
For non-ducted units, the adjustable settings such as louvers and fan speed shall be set according to the installations and operating instructions.
Without information from the manufacturer, louvers and fan speed shall be set for maximum air flow rate.
6.3 Setting the external static pressure difference for ducted air source units
The volume flow and the pressure difference shall be related to standard air and with dry heat exchanger. If the air flow rate Is given by the manufacturer with no atmospheric pressure, temperature and humidity conditions, it shall be considered as given for standard air conditions.
The air flow rate as stated in the installation and operating instructions shall be converted into standard air conditions. The air flow rate setting shall be made when the fan only is operating.
The resulting standard air flow rate shall be set and the resulting external static pressure (ESP)
measured.
If the ESP is lower than 30 Pa, the air flow rate is decreased to reach this minimum value.
The apparatus used for setting the ESP shall be maintained in the same position during all the tests. If the installation and operating instructions state that the maximum allowable duct length is for inlet and outlet together less than 2 m, then the unit shall be tested with its duct length but as a non-ducted unit; therefore the ESP is considered equal to 0 Pa
6.4 Setting the difference of temperature for heat pumps using a liquid as heat source For heat pump water heater using liquid (water or brine) as heat source, the nominal liquid flow rate as specified in the operation and installation instructions shall be set with the inict liquid temperature as given in Table 4.
For heat pump combination heater, the liquid flow rate as specified for space heating operation at
standard rating conditions at medium temperature application (47 °C/55 °C) according to EN 14511-2
and EN 14511-3 shall be set with the inlet liquid temperature as given in Table 4.
6.5 Test conditions
6.5.1 General test conditions
The tests shall be carried out at the relevant test conditions specified in Table 3 and Table 4.
For heat pumps using ventilation exhaust air as heat source, the air flow rate shall be set as specified by the manufacturer but shall not exceed the maximum values given in Table 5.
Permissible deviations shall not exceed the values specified in Table 2. In addition the maximal permissible deviation of thermal energy for the complete load profile shall be 5 %.
6.5.2 Additional test conditions
For heat pumps using ventilation exhaust air as heat source, additional air flow rates can be tested.BS/EN 16147-2017 pdf download.