P2S External Magazine Summer 2023 | Page 12

Table 3 : System Options and Comparison
Gas Fired Boilers Heat Pump Technology
Options
Heating Capacity ( MBH )
Minimum Heating Capacity ( MBH )
Peak Heating Efficiency ( GOP )
Heating Capacity ( MBH )
Minimum Heating Capacity ( MBH )
Full Load Heating Efficiency ( GOP )
CHW Capacity ( TONS )
Cooling Efficiency ( GOP )
System Efficiency ( GOP )
Equipment Weight
Electrical MOP @ 480v / 3PH
Central Equipment Cost ($)
Base Case
Option 1 : HP Chiller
Option 2 : HR Chiller
Option 3 : Hybrid Plant
6,200
310
0.9
N / A
N / A
N / A
N / A
N / A
N / A
6,000
*
$ 200,00
N / A
N / A
N / A
8,300
690
2.2
730
9.728
N / A
50,000
1,600
$ 1,600,000
N / A
N / A
N / A
6,400
530
N / A
365
N / A
5.3
18,500
800
$ 600,000
4,000
200
0.9
2,200
220
N / A
145
N / A
8.5
9,500
250
$ 400,000
The HRC requires pumps on the chilled water side to ensure the chiller modules maintain the required differential pressure drop across the heat exchanger . Gas-fired boilers are designed as part of the system for condensing temperatures and will operate during peak loads , when the HRC can no longer maintain system loads .
Table 3 provides an overview of assumptions for each option compared to the baseline natural gas-boilers . This methodology is used to simplify the calculations and evaluate the options at a high level . Figure 2 compares the annual carbon impacts . For simplicity , a more detailed lifecycle cost analysis ( LCCA ) has not been included here but should be considered for any project . Table 3 provides a quick overview and comparison of system options . Option 1 is a fully independent heating system but presents significant challenges related to weight , physical size , electrical requirements and first costs . The existing facility that would house the new heat pump equipment ( Building B ) has an 800A electrical service , which would require Option 1 to upsize the electrical service to the building . Option 2 presents a similar challenge .
12 P2S EXTERNAL MAGAZINE SUMMER 2023