ASHRAE Journal - September 2012 - 92
refrigeration applications
returning from it. When the cooling demand is low in all units, they Greater pump power savings can be achieved by reducing pump will still draw the maximum flow, but will not make good use of it. speed. If the speed is one-half then the power is one-eighth, but be This is a bit like a bus company sending the maximum rush careful because pressure capability is only one-quarter of what it hour number of buses all through the day. was. Generally, speed control only operates It gives great service to the traveller at between 70% and 90% of full load speed but lunchtime but every bus is nearly empty, the power savings are still very attractive. and it is clearly not a very efficient way Now the water system design guys reto operate. The simplest way to avoid this ally have to scratch their heads to make problem is to reduce flow to each load sure each cooling load gets its fair share of when less cooling is required. This drops water under all conditions. If the loads are the flow rate within the cooling coil, but on different floors of the building, this can since the load is light and water is supplied be tricky because convection in the rising at a constant temperature, this should not headers can disrupt flow. In all cases, the be a problem. It also changes the operating real name of the game is to make sure the point for the pumps, so the water system return water temperature coming back to design guys don’t like it because they have You wait ages for a decent chiller control the chillers is as warm as possible. to think a bit more, but the pump will be algorithm and then several come at once. Inadvertent parasitic losses are easier to happy to find a new balance point further up the curve. deal with. These are things like open windows when the air conIf the cooler needs to have a fixed flow, then the variable ditioning is on, fresh air dampers stuck wide open, computers left main flow can be achieved by recirculating water through the on all the time, and so on. In a refrigeration plant, leaks from the cooler until it warms up enough to be released back to the high-pressure side to the low-pressure side of the plant (which are chiller. This requires the extra complication of a recirculat- like leaving an internal window open) fall into this category. To ing pump and three-port valve at the cooling load. The main paraphrase a well known sportswear company, “Just don’t do it!” chilled water pumps still have to run up and down the curve Andy Pearson, Ph.D., C.Eng., is group engineering director like mice on a clock. at Star Refrigeration in Glasgow, U.K.
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92
ASHRAE Journal
September 2012
ASHRAE Journal - September 2012
Table of Contents for the Digital Edition of ASHRAE Journal - September 2012
ASHRAE Journal - September 2012
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Designing Air-Distribution Systems to Maximize Comfort
Long-Term Commercial GSHP Performance: Part 3: Loop Temperatures
Chilled Beams in Historic Building
Technology Award Case Studies:
GSHP for 1920s Building
Savings Funds Project
Solar Thermal Retrofit
Standing Columns
Engineer's Notebook
Guía Ferial AHR Expo-México
Indice
Mensajes de ASHRAE y AHRI
Listado alfabético de expositores
Plano de planta de la sala de exposiciones
La humedad en los edificios
Productos expuestos en AHR Expo-México
Lista de anunciantes
Emerging Technologies
Refrigeration Applications
Washington Report
Business & Management
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - September 2012 - ASHRAE Journal - September 2012
ASHRAE Journal - September 2012 - Cover2
ASHRAE Journal - September 2012 - 1
ASHRAE Journal - September 2012 - 2
ASHRAE Journal - September 2012 - Contents
ASHRAE Journal - September 2012 - Commentary
ASHRAE Journal - September 2012 - 5
ASHRAE Journal - September 2012 - Industry News
ASHRAE Journal - September 2012 - 7
ASHRAE Journal - September 2012 - 8
ASHRAE Journal - September 2012 - 9
ASHRAE Journal - September 2012 - Letters
ASHRAE Journal - September 2012 - 11
ASHRAE Journal - September 2012 - 12
ASHRAE Journal - September 2012 - 13
ASHRAE Journal - September 2012 - 14
ASHRAE Journal - September 2012 - 15
ASHRAE Journal - September 2012 - 16
ASHRAE Journal - September 2012 - Meetings and Shows
ASHRAE Journal - September 2012 - 18
ASHRAE Journal - September 2012 - 19
ASHRAE Journal - September 2012 - Designing Air-Distribution Systems to Maximize Comfort
ASHRAE Journal - September 2012 - 21
ASHRAE Journal - September 2012 - 22
ASHRAE Journal - September 2012 - 23
ASHRAE Journal - September 2012 - 24
ASHRAE Journal - September 2012 - 25
ASHRAE Journal - September 2012 - 26
ASHRAE Journal - September 2012 - 27
ASHRAE Journal - September 2012 - Long-Term Commercial GSHP Performance: Part 3: Loop Temperatures
ASHRAE Journal - September 2012 - 29
ASHRAE Journal - September 2012 - 30
ASHRAE Journal - September 2012 - 31
ASHRAE Journal - September 2012 - 32
ASHRAE Journal - September 2012 - 33
ASHRAE Journal - September 2012 - 34
ASHRAE Journal - September 2012 - 35
ASHRAE Journal - September 2012 - 36
ASHRAE Journal - September 2012 - 37
ASHRAE Journal - September 2012 - 38
ASHRAE Journal - September 2012 - 39
ASHRAE Journal - September 2012 - 40
ASHRAE Journal - September 2012 - 41
ASHRAE Journal - September 2012 - 42
ASHRAE Journal - September 2012 - 43
ASHRAE Journal - September 2012 - 44
ASHRAE Journal - September 2012 - 45
ASHRAE Journal - September 2012 - Chilled Beams in Historic Building
ASHRAE Journal - September 2012 - 47
ASHRAE Journal - September 2012 - 48
ASHRAE Journal - September 2012 - 49
ASHRAE Journal - September 2012 - 50
ASHRAE Journal - September 2012 - 51
ASHRAE Journal - September 2012 - 52
ASHRAE Journal - September 2012 - 53
ASHRAE Journal - September 2012 - 54
ASHRAE Journal - September 2012 - 55
ASHRAE Journal - September 2012 - GSHP for 1920s Building
ASHRAE Journal - September 2012 - 57
ASHRAE Journal - September 2012 - 58
ASHRAE Journal - September 2012 - 59
ASHRAE Journal - September 2012 - 60
ASHRAE Journal - September 2012 - 61
ASHRAE Journal - September 2012 - 62
ASHRAE Journal - September 2012 - 63
ASHRAE Journal - September 2012 - Savings Funds Project
ASHRAE Journal - September 2012 - 65
ASHRAE Journal - September 2012 - 66
ASHRAE Journal - September 2012 - 67
ASHRAE Journal - September 2012 - 68
ASHRAE Journal - September 2012 - 69
ASHRAE Journal - September 2012 - 70
ASHRAE Journal - September 2012 - 71
ASHRAE Journal - September 2012 - Solar Thermal Retrofit
ASHRAE Journal - September 2012 - 73
ASHRAE Journal - September 2012 - 74
ASHRAE Journal - September 2012 - 75
ASHRAE Journal - September 2012 - 76
ASHRAE Journal - September 2012 - 77
ASHRAE Journal - September 2012 - Engineer's Notebook
ASHRAE Journal - September 2012 - 79
ASHRAE Journal - September 2012 - 80
ASHRAE Journal - September 2012 - Guía Ferial AHR Expo-México
ASHRAE Journal - September 2012 - S2
ASHRAE Journal - September 2012 - Indice
ASHRAE Journal - September 2012 - Mensajes de ASHRAE y AHRI
ASHRAE Journal - September 2012 - S5
ASHRAE Journal - September 2012 - Listado alfabético de expositores
ASHRAE Journal - September 2012 - S7
ASHRAE Journal - September 2012 - S8
ASHRAE Journal - September 2012 - S9
ASHRAE Journal - September 2012 - S10
ASHRAE Journal - September 2012 - S11
ASHRAE Journal - September 2012 - Plano de planta de la sala de exposiciones
ASHRAE Journal - September 2012 - S13
ASHRAE Journal - September 2012 - La humedad en los edificios
ASHRAE Journal - September 2012 - S15
ASHRAE Journal - September 2012 - S16
ASHRAE Journal - September 2012 - S17
ASHRAE Journal - September 2012 - S18
ASHRAE Journal - September 2012 - S19
ASHRAE Journal - September 2012 - Productos expuestos en AHR Expo-México
ASHRAE Journal - September 2012 - S21
ASHRAE Journal - September 2012 - S22
ASHRAE Journal - September 2012 - S23
ASHRAE Journal - September 2012 - S24
ASHRAE Journal - September 2012 - S25
ASHRAE Journal - September 2012 - S26
ASHRAE Journal - September 2012 - S27
ASHRAE Journal - September 2012 - S28
ASHRAE Journal - September 2012 - S29
ASHRAE Journal - September 2012 - Lista de anunciantes
ASHRAE Journal - September 2012 - S31
ASHRAE Journal - September 2012 - S32
ASHRAE Journal - September 2012 - Emerging Technologies
ASHRAE Journal - September 2012 - 82
ASHRAE Journal - September 2012 - 83
ASHRAE Journal - September 2012 - 84
ASHRAE Journal - September 2012 - 85
ASHRAE Journal - September 2012 - 86
ASHRAE Journal - September 2012 - 87
ASHRAE Journal - September 2012 - 88
ASHRAE Journal - September 2012 - 89
ASHRAE Journal - September 2012 - Refrigeration Applications
ASHRAE Journal - September 2012 - 91
ASHRAE Journal - September 2012 - 92
ASHRAE Journal - September 2012 - 93
ASHRAE Journal - September 2012 - Washington Report
ASHRAE Journal - September 2012 - 95
ASHRAE Journal - September 2012 - 96
ASHRAE Journal - September 2012 - 97
ASHRAE Journal - September 2012 - Business & Management
ASHRAE Journal - September 2012 - 99
ASHRAE Journal - September 2012 - Products
ASHRAE Journal - September 2012 - 101
ASHRAE Journal - September 2012 - 102
ASHRAE Journal - September 2012 - Classified Advertising
ASHRAE Journal - September 2012 - Advertisers Index
ASHRAE Journal - September 2012 - Cover3
ASHRAE Journal - September 2012 - Cover4
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