638
N. Nakatsuka et al.
Remaining capacity of hot water storage tank kWh
1 hour heat demand kW
125
225
325
425
100
427
(1)
Excess heat
is discarded
(1)
Excess heat is
stored in the
storage tank
(1) CHP only
(2) CHP + Chip boiler (50% load)
(3) CHP + Chip boiler (100% load)
(4) CHP + Chip boiler (100% load) + Oil boiler
(1)
(1)
Use the heat
of the storage
tank
(2)
(2)
(3)
(3)
(4)
Do not output
excess heat
(4)
(4)
Excess heat is
stored in the
storage tank
Excess heat is
stored in the
storage tank
Excess heat is
stored in the
storage tank
Use the heat
of the storage
tank
Use the heat
of the storage
tank
Do not output
excess heat
Do not use
the heat of the
storage tank
Fig. 42.1 Operation algorithm for thermal equipment
42.4.2 Equipment Operation Management in the Two
Scenarios
In scenario A, it is assumed that the heat supply needed to meet fluctuating hourly
heat demand is produced by injecting fuel at the appropriate rate into the heavy oil
boiler. In scenario B, the CHP operates in a weekly start and stop (WSS) mode, from
8 am on Thursday to 8 pm on Monday. The chip boiler operates at either full “Stop,”
“50% load,” or “100% load,” as shown in Fig. 42.1.
A heavy oil boiler performs the appropriate partial load operation in the same
manner as in Scenario A. The heat supply and the heat storage amount in the hot
water tank are determined in each step, based on the chart in Fig. 42.1.
42.4.3 Data
To calculate the cost and CO 2 emissions of the energy conversion system at the
hot bath facility, the necessary data were collected through a literature search, field
surveys, etc. Table 42.1 shows the key values, including purchase price and installation costs, as well as the useful life of the various system components. The actual heat
demand at the targeted hot bath facility for a 1-week period in early November 2018
was determined based on the consumption of heavy oil during that week. Figure 42.2
N. Nakatsuka et al.
Remaining capacity of hot water storage tank kWh
1 hour heat demand kW
125
225
325
425
100
427
(1)
Excess heat
is discarded
(1)
Excess heat is
stored in the
storage tank
(1) CHP only
(2) CHP + Chip boiler (50% load)
(3) CHP + Chip boiler (100% load)
(4) CHP + Chip boiler (100% load) + Oil boiler
(1)
(1)
Use the heat
of the storage
tank
(2)
(2)
(3)
(3)
(4)
Do not output
excess heat
(4)
(4)
Excess heat is
stored in the
storage tank
Excess heat is
stored in the
storage tank
Excess heat is
stored in the
storage tank
Use the heat
of the storage
tank
Use the heat
of the storage
tank
Do not output
excess heat
Do not use
the heat of the
storage tank
Fig. 42.1 Operation algorithm for thermal equipment
42.4.2 Equipment Operation Management in the Two
Scenarios
In scenario A, it is assumed that the heat supply needed to meet fluctuating hourly
heat demand is produced by injecting fuel at the appropriate rate into the heavy oil
boiler. In scenario B, the CHP operates in a weekly start and stop (WSS) mode, from
8 am on Thursday to 8 pm on Monday. The chip boiler operates at either full “Stop,”
“50% load,” or “100% load,” as shown in Fig. 42.1.
A heavy oil boiler performs the appropriate partial load operation in the same
manner as in Scenario A. The heat supply and the heat storage amount in the hot
water tank are determined in each step, based on the chart in Fig. 42.1.
42.4.3 Data
To calculate the cost and CO 2 emissions of the energy conversion system at the
hot bath facility, the necessary data were collected through a literature search, field
surveys, etc. Table 42.1 shows the key values, including purchase price and installation costs, as well as the useful life of the various system components. The actual heat
demand at the targeted hot bath facility for a 1-week period in early November 2018
was determined based on the consumption of heavy oil during that week. Figure 42.2