2.7 Heat Source Group: Energy Consumption¶

2.7 Primary Energy Consumption of the Heat Source Group (continued)¶

2.7.9 Number of Operating Heat Source Devices¶

Calculate the number of operating heat sources in the heat source group.

Table 129. Input
Variable Name	Description	Unit	Reference
\(RefNumCtrl_{AC,ref,i}\)	Presence or Absence of control over the number of devices in the heat source group	Present/Absent	Form 2-5: (iii) Presence or Absence of Control over the Number of Devices
\(N_{AC,ref,i}\)	Total number of the heat source devices j belonging to the heat source group	Number of devices	Form 2-5: (6) Number of Input Lines for a Heat Source Device Model
\(q_{AC,ref,i,j,max,d}\)	Maximum capacity of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.8
\(q'_{AC,ref,i,rated}\)	Corrected rated capacity of the heat source group	kW	2.7.6
\(L_{AC,ref,i,d}\)	Load factor range for the heat source group i on date \(d\)	-	2.7.7

Table 130. Output
Variable Name	Description	Unit	Reference
\(N_{AC,ref,i,d}\)	Number of heat source devices belonging to the heat source group i in operation on date \(d\)	Number of devices	2.7.12, 2.7.15, 2.7.17

The number of heat sources operating in a heat source group is calculated by the following method a) or b), depending on whether the Presence or Absence of control over the number of devices is introduced.

a) If control over the number of devices is introduced ( \(RefNumCtrl_{AC,ref,i} = \mbox{Yes}\)),

\[ N_{AC,ref,i,d} = \min \left\{ N \,\mid\, A < B \;\land\; N \leq N_{AC,ref,i} \right\} \]

\[ A = q'_{AC,ref,i,rated} \times L_{AC,ref,i,d} \]

\[ B = \sum_{j=1}^{N} q_{AC,ref,i,j,max,d} \]

b) If control over the number of devices is not introduced ( \(RefNumCtrl_{AC,ref,i} = \mbox{no}\)),

\[ N_{AC,ref,i,d} = N_{AC,ref,i} \]

2.7.10 Rated Primary Energy Consumption of a Heat Source Device¶

Calculate the rated primary energy of a heat source device.

Table 131. Input
Variable Name	Description	Unit	Reference
\(RefType_{i,j}\)	Heat source device model of the heat source device j belonging to the heat source group	-	Form 2-5: (6) Heat Source Device Model
\(N_{AC,ref,i,j}\)	Number of the heat source devices j belonging to the heat source group	Number of devices	Form 2-5: (8) Number of Devices
\(q_{AC,ref,i,j,rated}\)	Rated capacity of the heat source device j belonging to the heat source group	kW/device	Form 2-5: (10) Rated Cooling/Heating Capacity
\(P_{AC,ref,main,i,j}\)	Main module energy consumption of the heat source device j belonging to the heat source group	kW/device	Form 2-5: (11) Main Nodule Rated Energy Consumption
\(K_{prime,ex,c}\)	Converted primary energy value for heat supplied by others (cooling)	-	Form 0: (12) Converted Primary Energy Value (Cooling)
\(K_{prime,ex,h}\)	Converted primary energy value for heat supplied by others (heating)	-	Form 0: (13) Converted Primary Energy Value (Heating)

Table 132. Output
Variable Name	Description	Unit	Reference
\(P_{AC,ref,i,j,rated}\)	Rated primary energy consumption of the heat source device j belonging to the heat source group	kW	2.7.11

Calculate the rated primary energy consumption of a heat source device. If the energy source of a heat source device is "electricity", multiply it by the primary energy conversion coefficient for electricity. If the energy source of a heat source device is "heat supplied by others", multiply it by the converted primary energy value for the heat supplied by others. In other cases, the converted primary energy value is input and no action is necessary. The fuel type \(FuelType_{i,j}\) is defined in the following file for each heat source device model \(RefType_{i,j}\).

List of heat source device models: REFLIST_H28.csv

a) \(FuelType_{i,j} = \mbox{electricity}\) (if energy source is electricity),

\[ P_{AC,ref,i,j,rated} = \frac{f_{prim,e}}{3600} \times P_{AC,ref,main,i,j} \times N_{AC,ref,i,j} \]

b) \(FuelType_{i,j} \in \{\mbox{chilled water}\}\) (when heat is supplied by others),

\[ P_{AC,ref,i,j,rated} = q_{AC,ref,i,j,rated} \times N_{AC,ref,i,j} \times K_{prime,ex,c} \]

c) \(FuelType_{i,j} \in \{\mbox{steam, hot water}\}\) (when heat is supplied by others),

\[ P_{AC,ref,i,j,rated} = q_{AC,ref,i,j,rated} \times N_{AC,ref,i,j} \times K_{prime,ex,h} \]

d) Other than a) b) c),

\[ P_{AC,ref,i,j,rated} = P_{AC,ref,main,i,j} \times N_{AC,ref,i,j} \]

2.7.11 Maximum Input¶

Calculate the maximum input of a heat source device using the maximum input characteristic.

Table 133. Input
Variable Name	Description	Unit	Reference
\(P_{AC,ref,i,j,rated}\)	Rated primary energy consumption of the heat source device j belonging to the heat source group	kW	2.7.10
\(\theta_{AC,ref,base,i,j,d}\)	Temperature of the heat source water, etc. of the heat source device j belonging to the heat source group i on date \(d\)	℃	2.7.4
\(a_{ref,p,i,j},b_{ref,p,i,j},c_{ref,p,i,j},d_{ref,p,i,j},e_{ref,p,i,j}\)	Coefficient of maximum input characteristic of the heat source device j belonging to the heat source group	-	A.4
\(\theta_{ref,p,i,j,min},\theta_{ref,p,i,j,max}\)	Minimum and maximum temperatures of the maximum input characteristic of the heat source device j belonging to the heat source group	℃	A.4

Table 134. Output
Variable Name	Description	Unit	Reference
\(P_{AC,ref,i,j,max,d}\)	Maximum input of the heat source device j belonging to the heat source group i on date \(d\) (converted primary energy value)	kW	2.7.16

The maximum input of the heat source device j belonging to the heat source group i on date \(d\) \(P_{AC,ref,i,j,max,d}\) is calculated by the following formula.

\[ P_{AC,ref,i,j,max,d} = P_{AC,ref,i,j,rated} \times \mathrm{F_{ref,p,i,j}}(\theta_{i,j,d}) \]

where the function \({\mathrm{F_{ref,p,i,j}}}\) is defined by the following formula.

\[ \begin{aligned} \mathrm{F_{ref,p,i,j}}(\theta_{i,j,d}) = a_{ref,p,i,j} \times \theta_{i,j,d}^{4} + b_{ref,p,i,j} \times \theta_{i,j,d}^{3} + c_{ref,p,i,j} \times \theta_{i,j,d}^{2} + d_{ref,p,i,j} \times \theta_{i,j,d} + e_{ref,p,i,j} \end{aligned} \]

\[ \theta_{i,j,d} = \begin{cases} \theta_{ref,p,i,j,min} & ,(\theta_{AC,ref,base,i,j,d} < \theta_{ref,p,i,j,min}) \\ \theta_{AC,ref,base,i,j,d} & ,(\theta_{ref,p,i,j,min} \leq \theta_{AC,ref,base,i,j,d} \leq \theta_{ref,p,i,j,max}) \\ \theta_{ref,p,i,j,max} & ,(\theta_{ref,p,i,j,max} < \theta_{AC,ref,base,i,j,d}) \end{cases} \]

2.7.12 Operating Load Factor of a Heat Source Group¶

Calculate the operating load factor of a heat source group.

Table 135. Input
Variable Name	Description	Unit	Reference
\(StorageType_{i}\)	Operation mode of the thermal storage system of the heat source group i (water thermal storage (mixed type), water thermal storage (stratified type), ice thermal storage, additional storage, none)	-	Form 2-5: (4) Thermal Storage System Operation Mode
\(q'_{AC,ref,i,rated}\)	Corrected rated capacity of the heat source group	kW	2.7.6
\(L_{AC,ref,i,d}\)	Load factor range for the heat source group i on date \(d\)	-	2.7.7
\(N_{AC,ref,i,d}\)	Number of heat source devices belonging to the heat source group i in operation on date \(d\)	Number of devices	2.7.9
\(q_{AC,ref,i,j,max,d}\)	Maximum capacity of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.8

Table 136. Output
Variable Name	Description	Unit	Reference
\(xL_{AC,ref,i,d}\)	Partial load factor of a heat source device in the heat source group i on date \(d\)	-	2.7.13, 2.7.15, 2.7.16
\(q_{AC,ref,i,max,d}\)	Maximum capacity of the heat source group i on date \(d\)	kW	2.7.15

First, the maximum capacity of the heat source group i on date \(d\) \(q_{AC,ref,i,max,d}\) is calculated by the following formula.

\[ q_{AC,ref,i,max,d} = \sum_{j=1}^{N_{AC,ref,i,d}} q_{AC,ref,i,j,max,d} \]

The load factor of the heat source group i on date \(d\) \(xL_{AC,ref,i,d}\) is calculated by the following formula. The load factor of a heat source group that has a thermal storage tank and performs thermal storage operation should always be 1.0.

a) If the operation mode is "water thermal storage (mixed type)", "water thermal storage (stratified type)", or "ice thermal storage",
(\(StrageType_{i} \in \{ \mbox{water thermal storage (mixed type)},\mbox{water thermal storage (stratified type)},\mbox{ice thermal storage} \}\))

\[ xL_{AC,ref,i,d} = 1.0 \]

b) Other than the above,

\[ xL_{AC,ref,i,d} = \frac{ q'_{AC,ref,i,rated} \times L_{AC,ref,i,d} }{ q_{AC,ref,i,max,d} } \]

2.7.13 Partial Load Characteristic¶

Calculate the partial load characteristic of heat source device.

Table 137. Input
Variable Name	Description	Unit	Reference
\(xL_{AC,ref,i,d}\)	Partial load factor of a heat source device in the heat source group i on date \(d\)	-	2.7.12
\(a_{ref,x,i,j},b_{ref,x,i,j},c_{ref,x,i,j},d_{ref,x,i,j},e_{ref,x,i,j}\)	Coefficient of partial load characteristic of the heat source device j belonging to the heat source group	-	A.4
\(L_{ref,x,i,j,min},L_{ref,x,i,j,max}\)	Minimum and maximum load factor of partial load characteristic of the heat source device j belonging to the heat source group	-	A.4

Table 138. Output
Variable Name	Description	Unit	Reference
\(f_{AC,ref,x,i,j,d}\)	Partial load characteristic of the heat source device j belonging to the heat source group i on date \(d\)	-	2.7.16

The partial load characteristic (the relationship between load factor and input ratio) is obtained by the following formula.

\[ f_{AC,ref,x,i,j,d} = \begin{cases} \mathrm{F_{ref,x,i,j}}(L_{i,j,d}) & ,(xL_{AC,ref,i,d} \leq 1.0) \\ 1.2 & ,(xL_{AC,ref,i,d} > 1.0) \end{cases} \]

where the function \({\mathrm{F_{ref,x,i,j}}}\) is defined by the following formula. If the coefficient of the partial load characteristic varies depending on the partial load factor or cooling water temperature, an appropriate coefficient should be selected to match the conditions.

\[ \begin{aligned} \mathrm{F_{ref,x,i,j}}(L_{i,j,d}) = a_{ref,x,i,j} \times L_{i,j,d}^{4} + b_{ref,x,i,j} \times L_{i,j,d}^{3} + c_{ref,x,i,j} \times L_{i,j,d}^{2} + d_{ref,x,i,j} \times L_{i,j,d} + e_{ref,x,i,j} \end{aligned} \]

\[ L_{i,j,d} = \begin{cases} L_{ref,x,i,j,min} & ,(xL_{AC,ref,i,d} < L_{ref,x,i,j,min}) \\ xL_{AC,ref,i,d} & ,(L_{ref,x,i,j,min} \leq xL_{AC,ref,i,d} \leq L_{ref,x,i,j,max}) \\ L_{ref,x,i,j,max} & ,(L_{ref,x,i,j,max} < xL_{AC,ref,i,d}) \end{cases} \]

2.7.14 Water Supply Temperature Characteristics¶

Calculate the water supply temperature characteristics of a heat source device.

Table 139. Input
Variable Name	Description	Unit	Reference
\(\theta_{AC,ref,i,j,wtr}\)	Water supply temperature of the heat source device j in the heat source group	℃	Form 2-5: (9) Water Supply Temperature
\(a_{ref,t,i,j},b_{ref,t,i,j},c_{ref,t,i,j},d_{ref,t,i,j},e_{ref,t,i,j}\)	Coefficient of water supply temperature characteristic of the heat source device j belonging to the heat source group	-	A.4
\(\theta_{ref,t,i,j,min},\theta_{ref,t,i,j,max}\)	Minimum and maximum temperatures of the water supply temperature characteristics of the heat source device j belonging to the heat source group	℃	A.4

Table 140. Output
Variable Name	Description	Unit	Reference
\(f_{AC,ref,t,i,j,d}\)	Water supply temperature characteristic of the heat source device j belonging to the heat source group i on date \(d\)	-	2.7.16

The water supply temperature characteristic is obtained as a function of water supply temperature \(\theta_{i,j,d}\) by the following formula.

\[ f_{AC,ref,t,i,j,d} = \mathrm{F_{ref,t,i,j}}(\theta_{i,j,d}) \]

where the function \({\mathrm{F_{ref,t,i,j}}}\) is defined by the following formula.

\[ \begin{aligned} \mathrm{F_{ref,t,i,j}}(\theta_{i,j,d}) = a_{ref,t,i,j} \times \theta_{i,j,d}^{4} + b_{ref,t,i,j} \times \theta_{i,j,d}^{3} + c_{ref,t,i,j} \times \theta_{i,j,d}^{2} + d_{ref,t,i,j} \times \theta_{i,j,d} + e_{ref,t,i,j} \end{aligned} \]

\[ \theta_{i,j,d} = \begin{cases} \theta_{ref,t,i,j,min} & ,(\theta_{AC,ref,i,j,wtr} < \theta_{ref,t,i,j,min}) \\ \theta_{AC,ref,i,j,wtr} & ,(\theta_{ref,t,i,j,min} \leq \theta_{AC,ref,i,j,wtr} \leq \theta_{ref,t,i,j,max}) \\ \theta_{ref,t,i,j,max} & ,(\theta_{ref,t,i,j,max} < \theta_{AC,ref,i,j,wtr}) \end{cases} \]

2.7.15 Correction of Operating Hours Considering a Heat Storage System¶

Correct the operating hours of heat source group according to the presence or absence of a thermal storage tank. The operating hours before correction should be referred to as "standard operating hours" and the operating hours after correction should be referred to as "operating hours".

Table 141. Input
Variable Name	Description	Unit	Reference
\(StorageType_{i}\)	Operation mode of the thermal storage system of the heat source group i (water thermal storage (mixed type), water thermal storage (stratified type), ice thermal storage, additional storage, none)	-	Form 2-5: (4) Thermal Storage System Operation Mode
\(ThrmlStrg_{AC,ref,ts,i}\)	Presence or Absence of thermal storage tank in the heat source group	Present/Absent	2.7.1
\(T_{AC,ref,base,i,d}\)	Standard operating hours of the heat source group i on date \(d\)	h/d	2.7.3
\(Q_{AC,ref,i,d}\)	Heat load of heat source group i on date \(d\)	MJ/d	2.7.2
\(q_{AC,ref,i,j,max,d}\)	Maximum capacity of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.8
\(N_{AC,ref,i,d}\)	Number of heat source devices belonging to the heat source group i in operation on date \(d\)	Number of devices	2.7.9
\(q_{AC,ref,i,max,d}\)	Maximum capacity of the heat source group i on date \(d\)	kW	2.7.12
\(xL_{AC,ref,i,d}\)	Partial load factor of a heat source device in the heat source group i on date \(d\)	-	2.7.12

Table 142. Output
Variable Name	Description	Unit	References
\(T_{AC,ref,i,d}\)	Operating hours of the heat source group i on date \(d\)	h/d	2.7.18

The operating hours of the heat source group i on date \(d\) \(T_{AC,ref,i,d}\) is calculated by the following formula.

a) If there is no thermal storage tank and the operation mode is not "additional",
( \(ThrmlStrg_{AC,ref,ts,i} = \mbox{none} \land StorageType_{i} \neq \mbox{additional}\))

\[ T_{AC,ref,i,d} = T_{AC,ref,base,i,d} \]

b) If there is a thermal storage tank
( \(ThrmlStrg_{AC,ref,ts,i} = \mbox{present}\) ),

\[ T_{AC,ref,i,d} = \frac{ Q_{AC,ref,i,d} }{ q_{AC,ref,i,max,d} } \times \frac{1000}{3600} \]

c) If the operation mode is "additional"
( \(StorageType_{i} = \mbox{additional}\)),

\[ T_{AC,ref,i,d} = C \times T_{AC,ref,base,i,d} \]

The constant C in the above formula is calculated by the following formula.

If \(N_{AC,ref,i,d} = 1\),

\[ C = 1.0 \]

If \(N_{AC,ref,i,d} \neq 1\),

\[ C = 1.0 - \left( q_{AC,ref,i,1,max,d} \times \frac{ 1.0 - xL_{AC,ref,i,d} }{ xL_{AC,ref,i,d} \times \sum_{j=2}^{N_{AC,ref,i,d}} q_{AC,ref,i,j,max,d} } \right) \]

2.7.16 Primary Energy Consumption of a Heat Source Device¶

Calculate the primary energy consumption of a single heat source device.

Table 143. Input
Variable Name	Description	Unit	Reference
\(RefType_{i,j}\)	Heat source device model name of the heat source device j belonging to the heat source group	-	Form 2-5: (6) Heat Source Device Model
\(q_{AC,ref,i,j,rated}\)	Rated capacity of the heat source device j belonging to the heat source group	kW	Form 2-5: (10) Rated Cooling/Heating Capacity
\(P_{AC,ref,sub,i,j,rated}\)	Rated power consumption of an auxiliary module of the heat source device j belonging to the heat source group	kW	Form 2-5: (12) Auxiliary Unit Rated Power Consumption
\(P_{AC,ref,pump,i,j,rated}\)	Rated power consumption of primary pump of the heat source device j belonging to the heat source group	kW	Form 2-5: (13) Primary Pump Rated Power Consumption
\(P_{AC,ref,ctfan,i,j}\)	Power consumption of cooling tower fan of the heat source device j belonging to the heat source group	kW	Form 2-5: (15) Cooling Tower Fan Rated Power Consumption
\(P_{AC,ref,ctpump,i,j}\)	Power consumption of a cooling water pump of the heat source device j belonging to the heat source group	kW	Form 2-5: (16) Cooling Water Pump Rated Power Consumption
\(P_{AC,ref,i,j,max,d}\)	Maximum input of the heat source device j belonging to the heat source group i on date \(d\) (converted primary energy)	kW	2.7.11
\(f_{AC,ref,t,i,j,d}\)	Water supply temperature characteristic of the heat source device j belonging to the heat source group i on date \(d\)	-	2.7.14
\(f_{AC,ref,x,i,j,d}\)	Partial load characteristic of the heat source device j belonging to the heat source group i on date \(d\)	-	2.7.13
\(L_{AC,ref,i,d}\)	Load factor range for the heat source group i on date \(d\)	-	2.7.7
\(xL_{AC,ref,i,d}\)	Partial load factor of a heat source device in the heat source group i on date \(d\)	-	2.7.12
\(Season_{d}\)	Cooling/heating season (cooling, intermediate, or heating seasons) on date \(d\)	-	2.2.2

Table 144. Output
Variable Name	Description	Unit	Reference
\(E_{AC,ref,main,i,j,d}\)	Energy consumption of the heat source device j belonging to the heat source group i on date \(d\) (converted primary energy)	kW	2.7.17
\(E_{AC,ref,sub,i,j,d}\)	Power consumption of an auxiliary module of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.17
\(E_{AC,ref,pump,i,j,d}\)	Power consumption of the primary pump of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.17
\(E_{AC,ref,ctfan,i,j,d}\)	Power consumption of a cooling tower fan of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.17
\(E_{AC,ref,ctpump,i,j,d}\)	Power consumption of a cooling water pump of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.17

Table 145. Intermediate Variable
Variable Name	Description	Unit
\(P_{AC,ref,sub,nG,i,j,d}\)	Auxiliary module power of the heat source device j belonging to the heat source group i (power consumption of a heat source with power generation function when not generating power)	kWh/hour

The energy consumption of the main module of the heat source device j belonging to the heat source group i on date \(d\), the energy consumption by the primary pump power, and the energy consumption of a cooling tower fan are calculated by the following formula.

\[ E_{AC,ref,main,i,j,d} = P_{AC,ref,i,j,max,d} \times f_{AC,ref,t,i,j,d} \times f_{AC,ref,x,i,j,d} \]

\[ E_{AC,ref,pump,i,j,d} = P_{AC,ref,pump,i,j,rated} \]

\[ E_{AC,ref,ctfan,i,j,d} = P_{AC,ref,ctfan,i,j} \]

The energy consumption of an auxiliary module of the heat source device j belonging to the heat source group i on date \(d\), is calculated differently depending on the presence or absence of power generation function. The Presence or Absence of a power generation function is preset for each heat source device model. When models with or without power generation function are mixed in the same heat source group, the correction is applied only to the auxiliary modules of the model with power generation function.

a) If \(RefType_{i,j}\) does not include "with device for self-supply of consumed power",

1) If \(0 < L_{AC,ref,i,d} \leqq 0.3\),

\[ E_{AC,ref,sub,i,j,d} = P_{AC,ref,sub,i,j,rated} \times 0.3 \]

2) If \(0.3 < L_{AC,ref,i,d} \leqq 1.0\),

\[ E_{AC,ref,sub,i,j,d} = P_{AC,ref,sub,i,j,rated} \times xL_{AC,ref,i,d} \]

3) If \(1.0 < L_{AC,ref,i,d}\),

\[ E_{AC,ref,sub,i,j,d} = P_{AC,ref,sub,i,j,rated} \times 1.2 \]

b) If \(RefType_{i,j}\) includes "with device for self-supply of consumed power",

\[ P_{AC,ref,sub,nG,i,j,d} = \begin{cases} 0.017 \times q_{AC,ref,i,j,rated} & ,(Seaon_{d} \in \{\mbox{cooling season, intermediate season}\}) \\ 0.012 \times q_{AC,ref,i,j,rated} & ,(Seadon_{d} = \mbox{heating season}) \end{cases} \]

1) If \(0 < L_{AC,ref,i,d} \leqq 0.3\),

\[ E_{AC,ref,sub,i,j,d} = 0.3 \times P_{AC,ref,sub,nG,i,j,d} - \left( P_{AC,ref,sub,nG,i,j,d} - P_{AC,ref,sub,i,j,rated} \right) \times xL_{AC,ref,i,d} \]

2) If \(0.3 < L_{AC,ref,i,d} \leqq 1.0\),

\[ E_{AC,ref,sub,i,j,d} = P_{AC,ref,sub,i,j,rated} \times xL_{AC,ref,i,d} \]

3) If \(1.0 < L_{AC,ref,i,d}\),

\[ E_{AC,ref,sub,i,j,d} = P_{AC,ref,sub,i,j,rated} \times 1.2 \]

The energy consumption of the cooling water pumps of the heat source device j belonging to the heat source group i on date \(d\) is calculated differently depending on the presence or absence of cooling water variable flow rate control. The Presence or Absence of a cooling water variable flow rate control is preset for each heat source device model.

a) If \(RefType_{i,j}\) does not include "cooling water variable flow rate",

\[ E_{AC,ref,ctpump,i,j,d} = P_{AC,ref,ctpump,i,j} \]

b) If \(RefType_{i,j}\) includes "cooling water variable flow rate",

1) If \(0 < L_{AC,ref,i,d} \leqq 0.5\),

\[ E_{AC,ref,ctpump,i,j,d} = P_{AC,ref,ctpump,i,j} \times 0.5 \]

2) If \(0.5 < L_{AC,ref,i,d} \leqq 1.0\),

\[ E_{AC,ref,ctpump,i,j,d} = P_{AC,ref,ctpump,i,j} \times xL_{AC,ref,i,d} \]

3) If \(1.0 < L_{AC,ref,i,d}\),

\[ E_{AC,ref,ctpump,i,j,d} = P_{AC,ref,ctpump,i,j} \times 1.2 \]

2.7.17 Primary Energy Consumption and Power Consumption of a Heat Source Group¶

Calculate the primary energy consumption and the power consumption of a heat source group.

Table 146. Input
Variable Name	Description	Unit	Reference
\(N_{AC,ref,i,d}\)	Number of heat source devices belonging to the heat source group i in operation on date \(d\)	Number of devices	2.7.9
\(E_{AC,ref,main,i,j,d}\)	Energy consumption of the heat source device j belonging to the heat source group i on date \(d\) (converted primary energy)	kW	2.7.16
\(E_{AC,ref,sub,i,j,d}\)	Power consumption per hour due to an auxiliary module power of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.16
\(E_{AC,ref,pump,i,j,d}\)	Power consumption per hour due to the primary pump power of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.16
\(E_{AC,ref,ctfan,i,j,d}\)	Power consumption per hour due to the cooling tower power consumption of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.16
\(E_{AC,ref,ctpump,i,j,d}\)	Power consumption per hour due to the cooling tower pump power of the heat source device j belonging to the heat source group i on date \(d\)	kW	2.7.16

Table 147. Output
Variable Name	Description	Unit	Reference
\(E_{AC,ref,main,i,d}\)	Primary energy consumption of the main module of a heat source group on date \(d\)	MJ/h	2.7.18
\(E_{AC,ref,sub,i,d}\)	Power consumption of an auxiliary module of the heat source group i on date \(d\)	kW	2.7.18
\(E_{AC,ref,pump,i,d}\)	Power consumption of the primary pump of the heat source group i on date \(d\)	kW	2.7.18
\(E_{AC,ref,ctfan,i,d}\)	Power consumption of the cooling tower fan of the heat source group i on date \(d\)	kW	2.7.18
\(E_{AC,ref,ctpump,i,d}\)	Power consumption of the cooling water pump of the heat source group i on date \(d\)	kW	2.7.18

The primary energy consumption and power consumption of heat source group are calculated by the following formula. "3.6" in the formula is the coefficient for converting kW to MJ/h (3600/1000).

\[ E_{AC,ref,main,i,d} = \sum_{j=1}^{N_{AC,ref,i,d}} E_{AC,ref,main,i,j,d} \times 3.6 \]

\[ E_{AC,ref,sub,i,d} = \sum_{j=1}^{N_{AC,ref,i,d}} E_{AC,ref,sub,i,j,d} \]

\[ E_{AC,ref,pump,i,d} = \sum_{j=1}^{N_{AC,ref,i,d}} E_{AC,ref,pump,i,j,d} \]

\[ E_{AC,ref,ctfan,i,d} = \sum_{j=1}^{N_{AC,ref,i,d}} E_{AC,ref,ctfan,i,j,d} \]

\[ E_{AC,ref,ctpump,i,d} = \sum_{j=1}^{N_{AC,ref,i,d}} E_{AC,ref,ctpump,i,j,d} \]

2.7.18 Annual Primary Energy Consumption of a Heat Source Group¶

Calculate the annual primary energy consumption of a heat source group.

Table 148. Input
Variable Name	Description	Unit	Reference
\(T_{AC,ref,i,d}\)	Operating hours of a heat source group i on date \(d\)	h/d	2.7.15
\(E_{AC,ref,main,i,d}\)	Primary energy consumption of the main module of the heat source group i on date \(d\)	MJ/h	2.7.17
\(E_{AC,ref,sub,i,d}\)	Power consumption of an auxiliary module of the heat source group i on date \(d\)	kW	2.7.17
\(E_{AC,ref,pump,i,d}\)	Power consumption of the primary pump of the heat source group i on date \(d\)	kW	2.7.17
\(E_{AC,ref,ctfan,i,d}\)	Power consumption of the cooling tower fan of the heat source group i on date \(d\)	kW	2.7.17
\(E_{AC,ref,ctpump,i,d}\)	Power consumption of the cooling water pump of the heat source group i on date \(d\)	kW	2.7.17

Table 149. Output
Variable Name	Description	Unit	Reference
\(E_{AC,ref,i}\)	Annual primary energy consumption of the heat source group	MJ/year	2.8

The annual primary energy consumption of a heat source group is calculated by the following formula.

\[ E_{AC,ref,i} = E_{AC,ref,main,i} + E_{AC,ref,sub,i} + E_{AC,ref,pump,i} + E_{AC,ref,ctfan,i} + E_{AC,ref,ctpump,i} \]

\[ E_{AC,ref,main,i} = \sum_{d=1}^{365} \left( E_{AC,ref,main,i,d} \times T_{AC,ref,i,d} \right) \]

\[ E_{AC,ref,sub,i} = \sum_{d=1}^{365} \left( E_{AC,ref,sub,i,d} \times T_{AC,ref,i,d} \right) \times 3600 \times 10^{-3} \times f_{prim,e} \]

\[ E_{AC,ref,pump,i} = \sum_{d=1}^{365} \left( E_{AC,ref,pump,i,d} \times T_{AC,ref,i,d} \right) \times 3600 \times 10^{-3} \times f_{prim,e} \]

\[ E_{AC,ref,ctfan,i} = \sum_{d=1}^{365} \left( E_{AC,ref,ctfan,i,d} \times T_{AC,ref,i,d} \right) \times 3600 \times 10^{-3} \times f_{prim,e} \]

\[ E_{AC,ref,ctpump,i} = \sum_{d=1}^{365} \left( E_{AC,ref,ctpump,i,d} \times T_{AC,ref,i,d} \right) \times 3600 \times 10^{-3} \times f_{prim,e} \]