How to Troubleshoot Apps for the Modern Connected Worker
NGCP for upload
1. Presented By: Christine Lazo
Vertical Systems
7113 Telegraph Rd.
Montebello, CA 90640
310 451 0630
christine@vertisys.net
2. Presentation Overview
Typical Problems of Chiller Plants
Engineers Ability to Impact Change
What is a Next Generation Central Plant?
The BIG Secret!
CPECS – The Difference is Controls
Measuring Performance
3. Major Problem In Plants Today
INEFFICIENCY
Wasted Energy
Wasted Water
Difficult Maintenance
Hard to Service
Not Sustainable
4. Typical Problems of Chiller Plants
Fixed Speed Keeps it Simple – and inefficient
Poor Chiller compressor turndown 3:1 – old tech
IGV
Systems that are governed by oil management
(can’t take cold cond water or low refrigerant flow)
Fouled Heat Exchangers
No Measurement of plant or chiller performance
Mis-match for building requirements vs plant
capability - Too big or Too few compressors
Plant Turndown Does not match Building AC
Required Turndown
4
7. The Dramatic Effects of Oil
• ASHRAE sampling shows average •Efficiency loss accounts for
percentages of oil present in substantial operation costs
chillers
7
9. What ARI Standards told us then
and now…
% load ARI standard 1992 ARI standard 1998
100 17% 1%
75 39% 42%
50 33% 45%
25 11% 12%
• Newer studies prove that PART-LOAD is of greater importance than
previous studies indicated.
• Building spends 87% of time in the 25-75% of max load.
• ARI Standard 1998 is a NATIONAL rule of thumb based on assumptions
9
10. What is California Building
IPLV?
Weighted Average Values
% Load Reality
100 1%
75 12%
50 45%
25 42%
Any Bin Hour Analysis
Program
10
11. Building Load Depends on Region/Use
(Existing Trended Data)
LOTS of PART LOAD HOURS!
11
12. 10 Story Office Building in Los Angeles
Energy Analysis conducted October 20th, 2009
*Analysis conducted on System Analyzer software
12
16. Presentation Overview
Typical Problems of Chiller Plants
Engineers Ability to Impact Change
What is a Next Generation Central Plant?
The BIG Secret!
CPECS – The Difference is Controls
Measuring Performance
17. What can we influence?
Ed Mazria – Architecture 2030
17
20. Influencers to change NOW
Timing is great!
New Technologies = Double efficiency
Essentially FREE Equipment at some
sites!
Usage component – up to 33 Cents
Rebate per an kwh saved
Increases in power costs (Power = $$$)
100% financing at low APRs for energy
efficient projects (2.9% for public jobs)
20
21. Improving the Central Plant Spec
Learning by MEASURING
Metric 1 = Wire to Water Efficiency Average
Metric 2 = Water Efficiency (usage)
Metric 3 = the MRS factor –maintainability,
reliability, sustainability
21
22. Presentation Overview
Typical Problems of Chiller Plants
Engineers Ability to Impact Change
What is a Next Generation Central Plant?
The BIG Secret!
CPECS – The Difference is Controls
Measuring Performance
23. What does a Next Gen Plant NOT HAVE?
Oil
PID Plant Controls with fixed setpoints
Chemical Treatment in Open Loop
Sunlit Open Tower Basins
Sand Filtration
Base Mounted Pumps
Across the Line and Y-Delta Starters
Gears and Shaft Seals on Chillers
23
24. What Does Next Gen Plant NEED?
Variable Primary Pumping
Variable Condenser Pumping
Variable Speed Oil-Free Magnetic Chiller
Variable High Turndown Cooling Tower
Measure Power of all Pumps, Chillers,
Towers
Measure Delivered Chilled Water Flow
Chemical Free Water Treatment
Vertical Inline Pumps
Centrifugal Separator Filtration 24
25. Components of the Next Gen Plant
Smardt Oil Free Variable Speed Chiller
CPECS All Variable Controls
Ultra Quiet – Evapco UT Cooling Tower – Min. 50%
Turndown and Efficient.
Pulse ~Pure - Chemical Free Water Treatment
Armstrong Vertical Inline Pumping Packages
Centrifugal Separator – Tower Filtration with solids
recovery- Zero water use.
25
26.
27. What is the Aim of Next
Generation Central Plant Design?
Reduce Water Consumption by
20%
Reduce Energy Consumption by
Over 50%
Reduce Maintenance by 50%
Reduce Life Cycle Cost
Reduce Size / Weight of the CP by
30%
Reduce Health Impact / Liability
Reduce Toxic Emissions
Reduce Corrosion
27
28. Presentation Overview
Typical Problems of Chiller Plants
Engineers Ability to Impact Change
What is a Next Generation Central Plant?
The BIG Secret!
CPECS – The Difference is Controls
Measuring Performance
29. THE
BIG Combining Turbocor
SECRET
and
All Variable Control
30. The Big Secret - Next Gen Plants
Combining Turbocor and All Variable Control
Use Heat Exchangers designed to stay online
at part load AND lower ECWT
CHANGE FROM - Capacity Based ON/OFF
control/individual PID loops
CHANGE TO - Speed Based Demand Control
with low pressure loss valves
30
31. Take Advantage of Heat Exchangers
designed to stay online at part load
Evapco Cooling Towers
Advances in tower nozzle design and chiller
condenser water circuit configurations allow
water flow through condenser to reduce all
the way down to 45% of nominal flow (10%
of full load pumping power).
32. Take Advantage of Heat Exchangers
designed to stay online at part load
AND lower ECWT
Smardt Oil-Free Chillers
Turbocor Magnetic Bearing Compressors have
built-in VFD
Systems are not governed by oil management
○ can take cold cond water or low refrigerant flow
33. IPLV and Condensing Temperature
Ex: 400 Ton Smardt Water-Cooled Chiller
85°F ECWT
75°F ECWT
65°F ECWT
kW/Ton
% of Full Load
Fixed LCHWT = 44°F
Fixed Chilled Water and Condensing Water Flow Rate
34. IPLV and Condensing Temperature
85°F ECWT
75°F ECWT
65°F ECWT
kW/Ton
% of Full Load
Fixed LCHWT = 44°F
Fixed Chilled Water and Condensing Water Flow Rate
35. IPLV and Condensing Temperature
85°F ECWT
75°F ECWT
65°F ECWT
kW/Ton
55°F ECWT
% of Full Load
But Smardt WC Chillers can operate down to 55 °F
ECWT
36. What difference does it make?
Chiller Efficiency is both a function of Load and “Lift of the Compressor”
Lift relates to the condensing temperature which is determined by the
ECWT from the cooling tower or the EDBT from the condenser fans.
When you reduce the condensing temperature, you reduce the work of
the compressor.
LESS WORK
LESS ENERGY
CONSUMPTION
37. The Impact of Load
kW/To
n
% of Full Load
For a Fixed ECWT, there is a 17% increase in efficiency between
100% load and 50% Load
38. Impact of Condensing Temperature
kW/Ton
0.280 kW/ton
0.180kW/ton
% of Full Load
At 50% Load
36% LESS Energy Consumption
Considering 45% annual hours at 50% of Full Load (per AHRI 550/590)
16.2% Annual Savings
41. Question:
What do you do to make an
All Variable Plant?
th
ANSWER:
My
Add VFDs to all the components. All plants
with VFD’s on them operate efficiently.
TRUTH:
Just installing drives on the equipment does not
guarantee energy savings!
A good example of this is putting a drive on a
cooling tower and applying a fixed set point.
42. Presentation Overview
Typical Problems of Chiller Plants
Engineers Ability to Impact Change
What is a Next Generation Central Plant?
The BIG Secret!
CPECS – The Difference is Controls
Measuring Performance
43. Water Cooled Chiller Plants - Loops
Ambient Condenser Chilled Supply
Refrigerant
Air Water Water Air
Loops Driven By Pumps Through Heat Exchangers
44. HX Loops – A Closer Look
Conventional Chilled Water System
Constant Speed Operation
Loops Driven By Pumps through heat Exchangers
45. Current Control Solutions
PID LOOP
PID LOOP
CONSTANT
PID LOOP
Three PID Loops, behaving independently (silos).
Capacity based sequencing.
Complex “reset” for strategies for light load. 45
46. HX Loops - Managing Lift
Conventional Chilled Water System
Constant Speed Operation
47. HX Loops - Managing Lift
Typical Part Load Operation
Reduce Approach by Reducing Flow
Maximize HX Transfer Time
48. All Variable Speed Plants – The Difference is Controls
A variable speed chiller that operates constant entering
condenser water temperature will perform only marginally
better than a much lower cost fixed speed chiller.
Centrifugal chillers gain performance when the temperature
lift between the evaporator and condenser is reduced.
Effect of optimized
tower set point
control results in a
42% performance
difference on the
same Turbocor chiller
49. What does All Variable Do?
All Variable Systems turn down with building demand by:
Eliminating plant over pumping by controlling all pumps in
system
○ Chilled and condenser water pumps, compressors, and CT fans
○ Every RPM turned that is more than necessary is wasted energy!
Using multiple compressors on single barrel to utilize surface
area
○ Offers better approaches and less work for compressors
MEASURING WIRE TO WATER EFFICIENCIES (kW in/tons out)
50. All Variable Speed Plants
Need advanced control algorithms combining
chilled water pump,
condenser water pump,
tower fan and
chiller speeds.
What proven control system can do this
reliably, repeatedly, and cost effectively?
CPECS
Central Plant Energy Control System
51. All Variable Speed Plants CPECS
Central Plant Energy Control System
CPECS combined with SMARDT oil free variable
speed chillers provides the following:
Optimized tower water temperature control.
Load matched variable speed condenser water pump
control that respects chillers minimum safe flow limits.
Optimized chiller sequencing.
Load based chilled water temperature reset
Variable primary chilled water pump control.
RESULT:
Highest performance targets
52. CPECS All Variable Benefits
Real time NIST Certified performance
Optimizes entire plant/HX loops into
single system for lowest energy
consumption
Packaged controls solution with Smardt
chiller for single source responsibility
Energy trending
Entire plant average 0.5kw/ton
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56. Presentation Overview
Typical Problems of Chiller Plants
Engineers Ability to Impact Change
What is a Next Generation Central Plant?
The BIG Secret!
CPECS – The Difference is Controls
Measuring Performance
58. Topics to be covered
This presentation shall demonstrate the actual operating performance
difference between the CPECS optimized logic and two cases of
conventional logic:
a) Constant speed condenser water pumping and
towers attempting to achieve wet bulb plus 10F
(a widely documented means for optimal
control).
b) Constant speed condenser water pumping and
towers maintaining 78F water temperature.
Chillers used for test are 2x 250Ton WA092 SMARDT chillers fitted with 3x
TT300 R134a Turbocor compressors. Chiller location is Las Vegas. All data
taken from an actual operating plant and only VFD speed and temperature
set points have been altered.
59. CPECS Vs Conventional Logic (a)
Conventional control logic: CPECS control logic:
•Constant speed condenser water •CPECS VFD condenser water
pumps. pumps.
•Towers running to maintain Twb +10F •CPECS VFD tower fans.
•Plant kW/ton = 0.97 ~ 1.06kW/Ton •Plant kW/ton = 0.54 ~ 0.57kW/ton
60. CPECS Vs Conventional Logic (a)
Conventional control logic: CPECS control logic:
• Total power input = 47.2kW • Total power input = 26.6kW
•Chiller performance improved by 8%.
• System performance decreased 70%
• Condenser water temperature after
25min running full speed fans only
decreased 2F.
61. Comparison (a) Conclusions
Despite the wet bulb temperature being 54F at the time
of test and the towers selected at 10F approach, a
theoretical condenser water temperature of 64F was not
reached within 25minutes. Instead many kW’s of non-
effective tower fan energy were used.
The net effect of the test showed that a 45% increase
in condenser water pump speed and tower logic that
chases the wet bulb temperature did not deliver an
increase in chiller performance anywhere close to being
able to offset the extra pumping and fan energy when
compared with CPECS.
62. Large
power
Comparison (a) data increase
seen due
to extra
pumping
and fan
energy
when
logic
changed.
63. CPECS Vs Conventional Logic (b)
Conventional control logic: CPECS control logic:
•Constant speed condenser water •CPECS VFD condenser water
pumps. pumps.
•Towers running to maintain 78F •CPECS VFD tower fans.
temperature
•Plant kW/ton = 0.87 ~ 0.94kW/Ton •Plant kW/ton = 0.54 ~ 0.57kW/ton
64. CPECS Vs Conventional Logic (b)
Conventional control logic: CPECS control logic:
• Total power input = 40.8kW • Total power input = 26.6kW
• Chiller performance decrease by 14%.
• System performance decreased 53%.
65. Comparison (b) Conclusions
Conventional plant design and control
logic decreases both chiller performance
and total plant performance at part load
when compared to fully optimized control
logic and VFD’S.
66. Comparison (b) data
Case (b) logic
applied
When
condenser water
temperature set
point increased
to 78F and
condenser water
pump forced to
60Hz both
pumping and
chiller energy
CPECS logic are increased.
operating here.
Time based on chart is 6 hours
Cooling Tower Basics W.G. Dockendorf, Inc This is a shot I took last year of a local cooling tower inlet. We see the same types of problems over and over to differing degrees on most every building…. Lets discuss a few common problems we see.
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc Improving building operations is the easiest, surest and most guaranteed investment in capital. The reason utilities provide such great incentives to our sector – is obvious….. That is where the power goes.
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Cooling Tower Basics W.G. Dockendorf, Inc
Application Rating conditions: LCHWT = 40.0 to 80.0 °F ECWT = 65.0 to 105.0°F EDBT = 55.0 to 125.0°F EWBT = 50.0 to 80.0°F (Evaporatively-cooled condensers)
Application Rating conditions: LCHWT = 40.0 to 80.0 °F ECWT = 65.0 to 105.0°F EDBT = 55.0 to 125.0°F EWBT = 50.0 to 80.0°F (Evaporatively-cooled condensers)
At 50% Load (45% annual hours): 36% LESS consumption Results in 16.2% Annual Savings