ASHRAE Journal - November 2009 - 42

ASHRAE59–2009 YE A R S JOURNAL www.info.hotims.com/25210-13 mum loading on the chiller in the first cooling season following the lighting retrofit and comparing this with the minimum flow rate limit of the chiller. The greater of the two establishes the new CW flow requirements of the system. When the new CW flow rate has been established, the pump impeller can be trimmed to meet that flow. Economics of Pump Impeller Trimming: Two factors affect the economics of pump impeller trimming: the trimming cost and the electric rates. Trimming cost consists primarily of labor. The total labor time involved will vary for each site because of factors such as the accessibility of the pump, the size of the pump, the location of the building site from the contractor’s machine shop and the amount of trimming needed. The time needed to balance 5 to 75 hp (3.7 to 56 kW) pumps in accordance with the Hydraulics Institute’s Centrifugal Test Code is eight hours.4 In the study, a twoperson per day labor estimate was preferred. With a labor rate of $50 per hour the total trimming cost is $800 per pump. This trimming cost was used in the calculations in Table 2, Page 38. The electric rates were obtained from the local utility.5 The utility rates are segregated by season and are slightly lower in the winter, which is a non-peak season. The winter rates comprise energy charges of $0.032 per kWh consumed with a demand charge of $6 per kW. Similarly, the summer rates are $0.034 per kWh and $7 per kW. For purposes of this study, the seasonal changeover dates for the utility’s rates were assumed to coincide with the building pumps. This simplified the energy savings calculations. It is worth noting that these electric rates are much lower than the national average electric rates. In comparison the national average electric rates for commercial use are $0.076 per kWh,6 and so the energy savings in other parts of the country may be higher on average. A simple payback was calculated for each building and is shown in Table 2. Ten of the 14 buildings had a simple payback of less than two years, two buildings had a payback of less than four years and two had paybacks greater than five years. The total savings ranged from less than $100 per year to a maximum of $2,400 per year. Using an average cost savings of $1,220 and assuming the building pumps have a life of 10 years, the total average savings that can be expected over the life of the pump are $12,200. November 2009 ASHRAE Journal

ASHRAE Journal - November 2009

Table of Contents for the Digital Edition of ASHRAE Journal - November 2009

ASHRAE Journal - November 2009
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Upgrading Chilled-Water Systems
50th Anniversary Feature: Energy Savings from Pump Impeller Trimming
Building Sciences
InfoCenter
Special Supplement: BACnet® Today
BACnet Table of Contents
BACnet and the Smart Grid
An Untangled Web: How BACnet is Connecting at ASHRAE’s Headquarters
Visualizing BACnet
BACnet & Trigeneration
BACnet Gets Smaller
Technical Topics
Washington Report
Special Products
Emerging Technologies
People
Research Topics
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - November 2009 - ASHRAE Journal - November 2009
ASHRAE Journal - November 2009 - Cover2
ASHRAE Journal - November 2009 - 1
ASHRAE Journal - November 2009 - 2
ASHRAE Journal - November 2009 - Contents
ASHRAE Journal - November 2009 - 4
ASHRAE Journal - November 2009 - Commentary
ASHRAE Journal - November 2009 - Industry News
ASHRAE Journal - November 2009 - 7
ASHRAE Journal - November 2009 - Letters
ASHRAE Journal - November 2009 - 9
ASHRAE Journal - November 2009 - 10
ASHRAE Journal - November 2009 - 11
ASHRAE Journal - November 2009 - 12
ASHRAE Journal - November 2009 - 13
ASHRAE Journal - November 2009 - Meetings and Shows
ASHRAE Journal - November 2009 - 15
ASHRAE Journal - November 2009 - Upgrading Chilled-Water Systems
ASHRAE Journal - November 2009 - 17
ASHRAE Journal - November 2009 - 18
ASHRAE Journal - November 2009 - 19
ASHRAE Journal - November 2009 - 20
ASHRAE Journal - November 2009 - 21
ASHRAE Journal - November 2009 - 22
ASHRAE Journal - November 2009 - 23
ASHRAE Journal - November 2009 - 24
ASHRAE Journal - November 2009 - 25
ASHRAE Journal - November 2009 - 26
ASHRAE Journal - November 2009 - 27
ASHRAE Journal - November 2009 - 28
ASHRAE Journal - November 2009 - 29
ASHRAE Journal - November 2009 - 30
ASHRAE Journal - November 2009 - 31
ASHRAE Journal - November 2009 - 32
ASHRAE Journal - November 2009 - 33
ASHRAE Journal - November 2009 - 33A
ASHRAE Journal - November 2009 - 33B
ASHRAE Journal - November 2009 - 50th Anniversary Feature: Energy Savings from Pump Impeller Trimming
ASHRAE Journal - November 2009 - 35
ASHRAE Journal - November 2009 - 36
ASHRAE Journal - November 2009 - 37
ASHRAE Journal - November 2009 - 38
ASHRAE Journal - November 2009 - 39
ASHRAE Journal - November 2009 - 40
ASHRAE Journal - November 2009 - 41
ASHRAE Journal - November 2009 - 42
ASHRAE Journal - November 2009 - 43
ASHRAE Journal - November 2009 - 44
ASHRAE Journal - November 2009 - 45
ASHRAE Journal - November 2009 - Building Sciences
ASHRAE Journal - November 2009 - 47
ASHRAE Journal - November 2009 - 48
ASHRAE Journal - November 2009 - 49
ASHRAE Journal - November 2009 - 50
ASHRAE Journal - November 2009 - 51
ASHRAE Journal - November 2009 - 52
ASHRAE Journal - November 2009 - 53
ASHRAE Journal - November 2009 - InfoCenter
ASHRAE Journal - November 2009 - 55
ASHRAE Journal - November 2009 - 56
ASHRAE Journal - November 2009 - 57
ASHRAE Journal - November 2009 - 58
ASHRAE Journal - November 2009 - 59
ASHRAE Journal - November 2009 - 60
ASHRAE Journal - November 2009 - 61
ASHRAE Journal - November 2009 - 62
ASHRAE Journal - November 2009 - 63
ASHRAE Journal - November 2009 - 64
ASHRAE Journal - November 2009 - Special Supplement: BACnet® Today
ASHRAE Journal - November 2009 - B2
ASHRAE Journal - November 2009 - B3
ASHRAE Journal - November 2009 - BACnet Table of Contents
ASHRAE Journal - November 2009 - B5
ASHRAE Journal - November 2009 - B6
ASHRAE Journal - November 2009 - B7
ASHRAE Journal - November 2009 - BACnet and the Smart Grid
ASHRAE Journal - November 2009 - B9
ASHRAE Journal - November 2009 - B10
ASHRAE Journal - November 2009 - B11
ASHRAE Journal - November 2009 - B12
ASHRAE Journal - November 2009 - B13
ASHRAE Journal - November 2009 - An Untangled Web: How BACnet is Connecting at ASHRAE’s Headquarters
ASHRAE Journal - November 2009 - B15
ASHRAE Journal - November 2009 - B16
ASHRAE Journal - November 2009 - B17
ASHRAE Journal - November 2009 - B18
ASHRAE Journal - November 2009 - Visualizing BACnet
ASHRAE Journal - November 2009 - B20
ASHRAE Journal - November 2009 - B21
ASHRAE Journal - November 2009 - B22
ASHRAE Journal - November 2009 - B23
ASHRAE Journal - November 2009 - BACnet & Trigeneration
ASHRAE Journal - November 2009 - B25
ASHRAE Journal - November 2009 - B26
ASHRAE Journal - November 2009 - B27
ASHRAE Journal - November 2009 - BACnet Gets Smaller
ASHRAE Journal - November 2009 - B29
ASHRAE Journal - November 2009 - B30
ASHRAE Journal - November 2009 - B31
ASHRAE Journal - November 2009 - B32
ASHRAE Journal - November 2009 - Technical Topics
ASHRAE Journal - November 2009 - Washington Report
ASHRAE Journal - November 2009 - 67
ASHRAE Journal - November 2009 - Special Products
ASHRAE Journal - November 2009 - 69
ASHRAE Journal - November 2009 - Emerging Technologies
ASHRAE Journal - November 2009 - 71
ASHRAE Journal - November 2009 - People
ASHRAE Journal - November 2009 - 73
ASHRAE Journal - November 2009 - Research Topics
ASHRAE Journal - November 2009 - Products
ASHRAE Journal - November 2009 - Classified Advertising
ASHRAE Journal - November 2009 - 77
ASHRAE Journal - November 2009 - 78
ASHRAE Journal - November 2009 - 79
ASHRAE Journal - November 2009 - Advertisers Index
ASHRAE Journal - November 2009 - Cover3
ASHRAE Journal - November 2009 - Cover4
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