- 確立冰水主機之節能效率 – EER、COP、kW/RT
- 雙方簽訂節能成效保證契約 (Energy Savings Performance Contracts，ESPC)
Various chiller plants efficiency in kW/RT (COP).
Input energy includes chillers, condenser pumps, and tower fans based on electrically driven centrifugal chiller plants in comfort conditioning application with 42F(5.6C) nominal chilled water supply temperature and open cooling tower sized for 85F(29.4C) maximum entering condenser water temperature. Local climate adjustment for North American climates is ±0.05 kW/RT.
Source: ASHRAE Journal
COP = Coefficient of Performance
Q = Refrigeration Capacity
U= Heat Transfer Coefficient
A = Heat Transfer Surface Area
△t = Temperature Differential
Qc = Mc × Cp × (T1 – T2 )
= Flow rate of cooling water × specific heat of cooling water × △T (temperature difference between inlet and outlet cooling water temperatures)
Qe= Me × Cp × (T3 – T4 )
= Flow rate of chilled water × specific heat of chilled water ×△T (temperature difference between inlet and outlet chilled water temperatures)
P = Power consumption of the chiller
Qe + P≒ Qc Heat Balance, within 5% deviation by ARI 550 Standard
COP = Qe / P
3.516/C.O.P. = kW/RT, 1 kW = 860 kcal/h, 1 USRT = 3.516 kW
- Keep constant Boundary Conditions for comparison, Control Volume Concept
Constant inlet cooling water temperature and outlet chilled water temperatures. Measuring Qc, Qe and P in kW , taken every 3 ~ 5 seconds for a duration of 1 ~ 2 minutes . Approximately 20 entries of measuring values shall be saved in the memory.
- The chiller’s COP performance test before and after FRIGAID® charging
After adding FRIGAID®, the chiller will be operated continuously for 3~4 weeks later.