23 Process Modelling for an Efficient and Dynamic Energy …
365
Step 2: Collect and calculate daily energy consumption during the crop cycle
Energy consumption comprises mainly of two components: cooling and heating of
the facility during the entire crop production cycle.
The crop cycle selected for this research study starts from 23 August 2017 to
4 May 2018. Key variables for measuring and evaluating energy consumption are
recorded every 5 min during the entire cycle, by a controlling system (Priva) that
maintains the required temperature and other conditions in the facility throughout
the production cycle. Cooling of the facility is facilitated through a combination of
fan and pump system of water circulation. Details of key variables associated with
cooling are shown in Table 23.1.
Heating of the facility is facilitated using heating water and circulation of heated
water through two networks of water pipes (Return 1 and Return 2). Details of heating
system including description of key variables and unit of measures are given in Table
23.2.
There are two heating systems using water lines: 1 (wall) and 2 (floor). There is
no heating demand during the summer. Heating pump power consumption. (0.17kw,
single phase. 1 for wall and 1 for floor). Since power consumption is recorded every
5-min interval, average consumption is evaluated using meter readings of respective
systems (Floor and Wall).
Table 23.1 Key variables of cooling at the protected crop facility
Variable
Unit of measure
Description
Details
Fan and pump (F&P)
active
Active or Non-active Fan and
Pump—ON/OFF
Water is circulated if
required
Involves multiple
stages
Variable F&P is a
binary variable.
Record of 1 means
both fan and pump is
ON
Cooling active
Active or Non-active Fan is ON/OFF
This is a binary
variable. Record of 1
means fan is ON
Meas F&P temp
Celsius (°C)
Measured F&P
temperature
This variable is the
same as the
corresponding
variable in the
environmental data
set
Temp F&P active
Celsius (°C)
Temperature setting to
activate cooling
This temperature
setting is changed as
crop matures. This
could be based on
advice from growers
365
Step 2: Collect and calculate daily energy consumption during the crop cycle
Energy consumption comprises mainly of two components: cooling and heating of
the facility during the entire crop production cycle.
The crop cycle selected for this research study starts from 23 August 2017 to
4 May 2018. Key variables for measuring and evaluating energy consumption are
recorded every 5 min during the entire cycle, by a controlling system (Priva) that
maintains the required temperature and other conditions in the facility throughout
the production cycle. Cooling of the facility is facilitated through a combination of
fan and pump system of water circulation. Details of key variables associated with
cooling are shown in Table 23.1.
Heating of the facility is facilitated using heating water and circulation of heated
water through two networks of water pipes (Return 1 and Return 2). Details of heating
system including description of key variables and unit of measures are given in Table
23.2.
There are two heating systems using water lines: 1 (wall) and 2 (floor). There is
no heating demand during the summer. Heating pump power consumption. (0.17kw,
single phase. 1 for wall and 1 for floor). Since power consumption is recorded every
5-min interval, average consumption is evaluated using meter readings of respective
systems (Floor and Wall).
Table 23.1 Key variables of cooling at the protected crop facility
Variable
Unit of measure
Description
Details
Fan and pump (F&P)
active
Active or Non-active Fan and
Pump—ON/OFF
Water is circulated if
required
Involves multiple
stages
Variable F&P is a
binary variable.
Record of 1 means
both fan and pump is
ON
Cooling active
Active or Non-active Fan is ON/OFF
This is a binary
variable. Record of 1
means fan is ON
Meas F&P temp
Celsius (°C)
Measured F&P
temperature
This variable is the
same as the
corresponding
variable in the
environmental data
set
Temp F&P active
Celsius (°C)
Temperature setting to
activate cooling
This temperature
setting is changed as
crop matures. This
could be based on
advice from growers