GENERATION

The annex D of EN 15316-1 standard provides the calculation procedure for the generation circuit. It is the general procedure that can be improved using the detailed standards for different type of generator, such as Heat pump, Combustion boilers, District heating and cooling, etc.

There are 2 typed of generaiont circuit:

1) Generation with DIRECT circuit withou hydraulic separtion 2) Generation with INDIPENDENT flow rate circuit, using the hydraulic separtion

DIRECT circuit

Figure 1: System C5-1 - Example of sample heating circuit with varying heat exchange

The standard define no control to the circuit. In the pybuildingenergy, the contol have been applied on the generator based on:

- 'Type A - Based on outdoor temperature': uses primary's own weather curve
- 'Type B - Based on demand'            : follows the secondary demand (θH_dis_flw)
- 'Type C - Constant temperature'       : uses self.θHW_gen_flw_const

Constants

Water specific heat - cw: 1.16 kWh/m3K

Product data:

No data

System design data:

No data

Process control data

No data

Operating condition

These values can be obtained simulating the thermal zone using the module iso 52016 of the library.

Parameter	Symbol	Unit	Default	Accetable	Description
Required generator output	QH_gen_out	kWh	-	0 to ∞	Required generator output
Generator operation time	tH_gen_i	h	1	1 to 744	Generator operation time
Generator circuit flow temperature	θH_gen_cr_flw	°C	-	0 to 110	Generator circuit flow temperature
Generator circuit return temperature	θH_gen_cr_ret	°C	-	0 to 110	Generator circuit return temperature
Generator circuit flow rate	V_H_gen_cr	m3/h	-	0 to ∞	Generator circuit flow rate

INDEPENDENT circuit

Figure 1: System C5-1 - Example of sample heating circuit with varying heat exchange

Constants

Water specific heat - cw: 1.16 kWh/m3K

Product data:

Parameter	Symbol	Unit	Default	Accetable	Description
Nominal generator power	max_output_g1	kW	-	0 to 104	Manufacturer's specified heat output in kilowatts (kW) under standard operating conditions
Nominal delta T (Δθ) water (flow-return)	dTp	°C	-	1..40	Standard temperature difference used for designing and evaluating HVAC systems, typically between the water entering and leaving the system

System design data:

No data

Process control data

Parameter	Symbol	Unit	Default	Accetable	Description
Generator pump speed control	speed_control_generator_pump	-	-	-	Generator pump speed control, could be varaible or deltaT_constant

Operating condition

These values can be obtained simulating the thermal zone using the module iso 52016 of the library.

Parameter	Symbol	Unit	Default	Accetable	Description
Required generator output	QH_gen_out	kWh	-	0 to ∞	Required generator output
Generator operation time	tH_gen_i	h	1	1 to 744	Generator operation time
Generator circuit flow temperature	θH_gen_cr_flw	°C	-	0 to 110	Generator circuit flow temperature
Generator circuit return temperature	θH_gen_cr_ret	°C	-	0 to 110	Generator circuit return temperature
Generator circuit flow rate	V_H_gen_cr	m3/h	-	0 to ∞	Generator circuit flow rate

Outputs

The follwing outputs are calculated for all configurations:

Parameter	Symbol	Unit	Default	Accetable	Description
Generation flow Temperature	Tp_sup	°C	-	-	Generation flow Temperature
Generation return Temperature	Tp_ret	°C	-	-	Generation return Temperature
Generation flow rate	V_H_gen	m3/h	-	-	Generation flow rate