Weather-Dependent Curve; What Is A Weather-Dependent Curve - Daikin EWYA004D2V3P Installer's Reference Manual

Example

11.5 Weather-dependent curve

11.5.1 What is a weather-dependent curve?

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
For the procedure to set the electricity price, see
4
price" [ 122].
This is an example and the prices and/or values used in this example are NOT
accurate.
Data
Gas price
Electricity price
Renewable heat incentive per kWh
Calculation of the gas price
Gas price=Actual gas price+(Incentive/kWh×0.9)
Gas price=4.08+(5×0.9)
Gas price=8.58
Calculation of the electricity price
Electricity price=Actual electricity price+Incentive/kWh
Electricity price=12.49+5
Electricity price=17.49
Price
Gas: 4.08 /kWh
Electricity: 12.49 /kWh
Weather-dependent operation
The unit operates 'weather-dependent' if the desired leaving water temperature is
determined automatically by the outdoor temperature. It therefore is connected to
a temperature sensor on the North wall of the building. If the outdoor temperature
drops or rises, the unit compensates instantly. Thus, the unit does not have to wait
for feedback by the thermostat to increase or decrease the leaving water
temperature. Because it reacts more quickly, it prevents high rises and drops of the
indoor temperature.
Advantage
Weather-dependent operation reduces energy consumption.

Weather-dependent curve

To be able to compensate for differences in temperature, the unit relies on its
weather-dependent curve. This curve defines how much the leaving water
temperature must be at different outdoor temperatures. Because the slope of the
curve depends on local circumstances such as climate and the insulation of the
house, the curve can be adjusted by an installer or user.
Types of weather-dependent curve
There are 2 types of weather-dependent curves:
11
|
"To set the electricity
Price/kWh
4.08
12.49
5
Value in breadcrumb
[7.6]=8.6
[7.5.1]=17
Configuration
Installer reference guide
123