Improved performance of hybrid photovoltaic-trigeneration systems over photovoltaic-cogen systems including effects of battery storage
This paper reviews the hybridization of CHP(Combined Heat and Power)with PV(Photovoltaic)and CCHP(Combined Cooling Heat and Power)with PV. It even explains the several advantages of using CHP+PV hybrid systems and CCHP+PV hybrid systems over conventional systems. Moreover, PV-Cogen and PV-trigen are found to be more effective at reducing emissions compared to conventional systems.
Advantages:
-Low emission of GHG(Green House Gas).
-High efficiency as most of the waste heat is utilized for heating water, space heating etc.
-Improved performance.
-Higher normalized power indices.
NOTES:-
Review of PV(Photovoltaic)
-In PV technology solar energy is directly converted to electricity. The efficiency is only about 6-20%.
-The PV has irregularities due to local weather conditions. Thus, PV technology is not consistent throughout the year. So, PV technology is combined with CHP unit.
Review of CHP(Combined Heat and Power)
-The CHP unit uses fuel like natural gas, bio-gas etc to generate electricity.
-The co-generation unit also produces thermal energy which is harnessed by a heat exchanger and utilized
Review of Battery Energy
-Battery is a storage device.
-Whenever excess electricity is generated by the hybrid system, it is stored in the battery and it is utilized during the time when the CHP and PV unit fails to meet the requirement.
Hybrid System(PV+CHP+battery)
-Electricity generated by the PV and Cogeneration unit is used to meet electric requirements. The waste heat is harnessed by heat exchanger to provide hot water and space heating.
-Whenever, excess electricity is generated it is stored in the batteries which is used to supply electricity when PV+CHP unit fails to meet requirements.
ADVANTAGES:
- GHG(Green House Gas) emission reduction.
- High efficiency as most of the waste heat is utilized for heating water, space heating etc.
- Improved performance.
- Higher normalized power indices.
Hybrid System(PV+CCHP+battery)
-In CHP there is still some amount of waste heat. So, in order to overcome this limitation PV-CCHP hybrid system are used.
-In CCHP, the remaining waste heat from the CHP is utilized by the system for air-conditioning(space cooling).
ADVANTAGES:
- Substantial GHG emission reduction.
- Very high efficiency(higher than PV+CHP hybrid system)
- Improved performance.
- Higher normalized power indices.