SUSDO
Strategic Unbalanced Supply-Demand Operation
Besides PCM and system optimization design, SUSDO is one of the three core elements of the Ultra High Efficiency BocaPCM-TES VSD Chiller Plant System.
Strategic Unbalanced Supply-Demand Operation (SUDSO) red=fer to the process of how Boca PCM TES works in a chiller system. It not only works as a cold buffer but also an extra free cold source for refrigeration load required . Here is an illustration of how PCM TES works.
What does UNBALANCED mean?
Let’s see a simple example.
(1) Common Chiller Plant System
Supposed that in a common chiller plant system the cooling load side asks the chiller plant side to supply 100RTs (Refrigeration Ton) to satisfy the need for cooling.
This is what’s happening :
The chiller plant responds to produce 100RTs to the demand side in a short period of time.
And when in prime hours the cooling load side rises the demand to 150RT, the chiller plant responds and rises its production capacity to 150RT in a short period of time.
In any situations, Supply equal to Demand.
This is BALANCED.
Drawbacks
- The whole system must be designed and equipped to cope with the peak demand.
- Equipment must be running subject to sudden rise of demand, thus aggravating deterioration or ageing problem.
- Chiller plant always throttle up and down may result in spending more energy.
(2) BocaPCM-TES Chiller Plant System
For a BocaPCM-TES Chiller Plant System, this is what’s happening.
If whenever the cooling load side demands for 80RT, the chiller plant will stably run at 60% to 80% of his capacity and produce 100RT as usual because at this level the chillers reach the best efficiency.
In this situation, Demand does not equal to supply.
This is UNBALANCED.
BocaPCM-TES restores the balance
(A) Store the surplus
In the example, where is the extra 20RT going?
It goes to the BocaPCM-TES Tank and is stored for later use.
(B) Release for the outstanding
If whenever the cooing load side rises the demand to 150RT, the chiller side can still run stably at its best efficiency level. It can keep supplying 100RT, only letting the BocaPCM-TES Tank to release 50RT from its storage to take up the outstanding amount so to satisfy the need from the cooling load side.
With BocaPCM-TES, SUSDO works!
The BocaPCM-TES System has its patented PCM panels stacked inside the tank which can store coolness for later use. Run stably all day long, even producing at night time, the TES stores residual RT capacity into the tank for daily use. When need is on call in daytime, an outstanding amount will be released from the tank to meet the rigid demand.
Without the storage, there are simply no way to practice SUSDO and the best possible efficiency level of the chillers can not be maintained all day long.
