ASHRAE Journal -November 2012 - 32

2012 Technology Award Case Studies
of the afternoon when the highest CHWR Pressures CHWS Pressures wet-bulb temperatures of the day are experienced to the evening when wetCurrent Conditions 30 to 55 psig 50 to 75 psig bulb temperatures are lower. The lowRaise CHW System Pressure er wet-bulb temperatures yield lower (For Single Direction Pumping Into the Chilled Water System) condenser water temperatures, which allow the chillers to operate more effiCurrent 70 psig 90 to 125 psig ciently during the night hours when the Future 70 psig 130 to 65 psig tank is being charged. In addition, the TES system allows chillers to operate Lower CHW System Pressure at their most efficient point, increas(For Single Direction Pumping Into Tank) ing the energy savings. Table 2 shows Current 5 psig 25 to 60 psig a summary of the energy information for various months throughout the first Future –35 psig 35 to 60 psig year of operation. Table 1: CHW system pressures with single direction pumping. There are three pieces of information to be extracted from the data in Table 2. First, during the first year of August September November January July 2011/ Item Units 2010 2010 2010 2011 August 2011 operation the operators were learning when to use the TES system to provide Amount of ton/h 1,274,770 1,345,796 751,813 140,976 1,707,715 a positive benefit to the system. SecStorage Used ond, the energy-saving potential is reFull Discharge days 22 24 15 1 28 duced during the winter. Finally, when the east chiller plant came on-line in Partial Discharge days 7 4 7 9 3 2011, it increased the overall system Energy Saved kWh 104,893 92,688 –18,685 814 38,751 efficiencies during the day and night operation, decreasing the day/night ef8.61% 7.18% –2.75% 0.64% 2.54% ficiency differential and lowering the Energy Reduction TES energy savings. (Note that during Energy Cost $101,159 $46,195 $9,435 $452 $506,837 2011, the chiller capacity increased by Saved* 40%, allowing TECO to reduce the op*On peak and off peak energy rates vary greatly based on real-time pricing. erating hours of its less efficient chillTable 2: Energy use data. ers. As loads increase, the hours of operation of the less efficient chillers 80 will increase, resulting in increased energy savings due to the TES system.) 60

Operation and Maintenance
The TES system provides the owner with several operational and maintenance benefits. When looking at the maintenance, the cost to maintain a stratified chilled water storage tank is much lower than that for equivalent chilled water production capacity. In essence, the TES tank is a large piece of pipe in the chilled water system, requiring a similar level of maintenance. Additional chillers and cooling towers would otherwise be required to be installed and maintained for the new production capacity. With the TES system, only the temperature and level sensors in the tank require maintenance, while both TES and non-TES systems would have approximately the same number of pumps to be maintained. The TES system provides the owner important operational flexibility with regard to when to make chilled water and when it is best to discharge the tank and send
32 ASHRAE Journal

40 20 0 Supply (psi) Return (psi) 0 8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136 144 152 160 168 Hours

Figure 3: Chilled water system pressures, before TES.
80 60 40 20 0 0 8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136 144 152 160 168 Hours Supply (psi) Return (psi)

Figure 4: Chilled water system pressures, after TES. ashrae.org November 2012



ASHRAE Journal -November 2012

Table of Contents for the Digital Edition of ASHRAE Journal -November 2012

ASHRAE Journal -November 2012
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Methods for Effective Room Air Distribution: Part One
Technology Award Case Studies:
TES for Medical Center
Feature Articles
Demand-Controlled Ventilation for Commercial Kitchens
Special Supplement: BACnet® Today and the Smart Grid
Commentary
BACnet for a City
Electric Utilities and the HVAC Industry
OpenADR Advances
Demand Response and Light Control
Standing Columns
Building Sciences
Special Section
InfoCenter
Data Centers
Emerging Technologies
Refrigeration Applications
Engineer's Notebook
Special Products
Washington Report
Products
Classified Advertising
Advertisers Index
ASHRAE Journal -November 2012 - ASHRAE Journal -November 2012
ASHRAE Journal -November 2012 - Cover2
ASHRAE Journal -November 2012 - 1
ASHRAE Journal -November 2012 - 2
ASHRAE Journal -November 2012 - Contents
ASHRAE Journal -November 2012 - Commentary
ASHRAE Journal -November 2012 - 5
ASHRAE Journal -November 2012 - Industry News
ASHRAE Journal -November 2012 - 7
ASHRAE Journal -November 2012 - 8
ASHRAE Journal -November 2012 - 9
ASHRAE Journal -November 2012 - 10
ASHRAE Journal -November 2012 - 11
ASHRAE Journal -November 2012 - Letters
ASHRAE Journal -November 2012 - 13
ASHRAE Journal -November 2012 - Meetings and Shows
ASHRAE Journal -November 2012 - 15
ASHRAE Journal -November 2012 - 16
ASHRAE Journal -November 2012 - 17
ASHRAE Journal -November 2012 - Methods for Effective Room Air Distribution: Part One
ASHRAE Journal -November 2012 - 19
ASHRAE Journal -November 2012 - 20
ASHRAE Journal -November 2012 - 21
ASHRAE Journal -November 2012 - 22
ASHRAE Journal -November 2012 - 23
ASHRAE Journal -November 2012 - 24
ASHRAE Journal -November 2012 - 25
ASHRAE Journal -November 2012 - 26
ASHRAE Journal -November 2012 - 27
ASHRAE Journal -November 2012 - TES for Medical Center
ASHRAE Journal -November 2012 - 29
ASHRAE Journal -November 2012 - 30
ASHRAE Journal -November 2012 - 31
ASHRAE Journal -November 2012 - 32
ASHRAE Journal -November 2012 - 33
ASHRAE Journal -November 2012 - 34
ASHRAE Journal -November 2012 - 35
ASHRAE Journal -November 2012 - Demand-Controlled Ventilation for Commercial Kitchens
ASHRAE Journal -November 2012 - 37
ASHRAE Journal -November 2012 - 38
ASHRAE Journal -November 2012 - 39
ASHRAE Journal -November 2012 - 40
ASHRAE Journal -November 2012 - 41
ASHRAE Journal -November 2012 - 42
ASHRAE Journal -November 2012 - 43
ASHRAE Journal -November 2012 - 44
ASHRAE Journal -November 2012 - 45
ASHRAE Journal -November 2012 - 46
ASHRAE Journal -November 2012 - 47
ASHRAE Journal -November 2012 - 48
ASHRAE Journal -November 2012 - Special Supplement: BACnet® Today and the Smart Grid
ASHRAE Journal -November 2012 - B2
ASHRAE Journal -November 2012 - Commentary
ASHRAE Journal -November 2012 - BACnet for a City
ASHRAE Journal -November 2012 - B5
ASHRAE Journal -November 2012 - B6
ASHRAE Journal -November 2012 - B7
ASHRAE Journal -November 2012 - B8
ASHRAE Journal -November 2012 - B9
ASHRAE Journal -November 2012 - Electric Utilities and the HVAC Industry
ASHRAE Journal -November 2012 - B11
ASHRAE Journal -November 2012 - B12
ASHRAE Journal -November 2012 - B13
ASHRAE Journal -November 2012 - B14
ASHRAE Journal -November 2012 - B15
ASHRAE Journal -November 2012 - OpenADR Advances
ASHRAE Journal -November 2012 - B17
ASHRAE Journal -November 2012 - B18
ASHRAE Journal -November 2012 - B19
ASHRAE Journal -November 2012 - Demand Response and Light Control
ASHRAE Journal -November 2012 - B21
ASHRAE Journal -November 2012 - B22
ASHRAE Journal -November 2012 - B23
ASHRAE Journal -November 2012 - B24
ASHRAE Journal -November 2012 - 49
ASHRAE Journal -November 2012 - Building Sciences
ASHRAE Journal -November 2012 - 51
ASHRAE Journal -November 2012 - 52
ASHRAE Journal -November 2012 - 53
ASHRAE Journal -November 2012 - 54
ASHRAE Journal -November 2012 - 55
ASHRAE Journal -November 2012 - InfoCenter
ASHRAE Journal -November 2012 - 57
ASHRAE Journal -November 2012 - 58
ASHRAE Journal -November 2012 - 59
ASHRAE Journal -November 2012 - 60
ASHRAE Journal -November 2012 - 61
ASHRAE Journal -November 2012 - 62
ASHRAE Journal -November 2012 - 63
ASHRAE Journal -November 2012 - Data Centers
ASHRAE Journal -November 2012 - 65
ASHRAE Journal -November 2012 - 66
ASHRAE Journal -November 2012 - 67
ASHRAE Journal -November 2012 - Emerging Technologies
ASHRAE Journal -November 2012 - 69
ASHRAE Journal -November 2012 - 70
ASHRAE Journal -November 2012 - 71
ASHRAE Journal -November 2012 - Refrigeration Applications
ASHRAE Journal -November 2012 - 73
ASHRAE Journal -November 2012 - Engineer's Notebook
ASHRAE Journal -November 2012 - 75
ASHRAE Journal -November 2012 - Special Products
ASHRAE Journal -November 2012 - Washington Report
ASHRAE Journal -November 2012 - Products
ASHRAE Journal -November 2012 - Classified Advertising
ASHRAE Journal -November 2012 - Advertisers Index
ASHRAE Journal -November 2012 - Cover3
ASHRAE Journal -November 2012 - Cover4
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