ASHRAE Journal - December 2009 - 49

are connected on the geothermal loop. Twenty-five water-to-air heat pumps 2,000,000 are used for the heating and cooling, six water-to-water heat pumps are used Heating Capacity to maintain ice temperature; one waterCooling Capacity 1,500,000 to-water heat pump is used to preheat Available Heat Recovery domestic hot water via a heat exchanger; and another heat pump is used for the 1,000,000 dehumidification. Heat pump systems offer the advantage of moving energy from one zone to another. Most arenas use chillers with stan500,000 dard condensers to produce and maintain the ice. The extracted heat is rejected outside through air condensers. 0 Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. In this project, rejected heat is reused as much as possible. A network of heating and cooling loops was built to Figure 1: No heat recovery on exhaust for outside air heating. satisfy the specific needs of each zone. Heat pumps produce chilled water circulating under the slab of the rink 2,000,000 to maintain the temperature of the ice. The heat rejected from the heat pumps Heating Capacity is combined to the geothermal loop Cooling Capacity 1,500,000 and is rejected in two hot water loops. Available Heat Recovery These loops supply radiant floor heating for the grandstand, heating for the community center’s premises through 1,000,000 a network of water-to-air heat pumps, preheating of domestic hot water, as well as heating under the slab to pre500,000 vent the soil from freezing. Most of the arena’s heating load is met by rejected heat from the mechanical cooling used 0 Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. to maintain the ice. Two enthalpy wheels were installed on the ventilation units, allowing for the Figure 2: Heat recovery on exhaust for outside air heating. recovery of latent and sensible energy usually lost in exhaust air from the locker rooms and other baseUsually, the chilled water network underneath the ice is ment rooms. These wheels were sized to allow low velocities a two-pass system. The loop covers the entire length of the (around 2.03 m/s [400 fpm]), enhancing heat exchange for a ice rink twice. Since every pass is 61 m (200 ft), the loop global efficiency of 76%. length is 122 m (400 ft), necessitating 130 loops to cover The energy simulations provide interesting figures on the the surface of the ice. For this arena, a five-pass system was potential energy saving of the thermal wheel heat exchanger chosen. This decision reduces refrigerant flow more than (Figures 1 and 2). 50%, which also reduces required pumping energy. The Sensors were installed in the arena and in the return ducts to five-pass network also helps maintain a better uniformity of monitor CO2 levels. By means of a VAV system, these CO2 sen- the ice temperature. The refrigerant used is water/methanol sors control fresh air, limiting the quantity of fresh air required (75/25), which has a lower viscosity than glycol, reducing without affecting air quality for the occupants. the required pumping energy. Another means to reduce the ventilation requirement is the The arena includes a cold storage mass made up of approxiuse of a new type of ice surfacing machine. Instead of the tra- mately 0.5 m (1.6 ft) thick of compacted sand mass under ditional propane devices, the vehicle chosen for the community the slab of the rink. Since internal gains are less important center is electrical to offer better air quality. This element helps at night (no lights or people) the cooling load is smaller. It reduce the amount of fresh air required in the building, which is then possible to create an artificial load by cooling the results in supplementary energy savings. sand under the ice to –10°C (14°F), while rejected heat December 2009 Capacity (Btu/h) Capacity (Btu/h) ASHRAE Journal

ASHRAE Journal - December 2009

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

ASHRAE Journal - December 2009
Contents
Commentary
Industry News
Letters
Meetings and Shows
ASHRAE Building EQ Program
Feature Articles
A Closer Look at Chiller Ratings
Cooling With Less Air: Using Underfloor Air Distribution and Chilled Beams
Cooling Concrete: Containerized Water Chilling Plant
Geothermal for Community Center
Anniversary Feature: Air-Recovery System Versus Conventional Air Conditioning
Technical Topics
New Product Preview
Products
Emerging Technologies
Washington Report
People
Special Products
2009 Feature Articles Indices
Classified Advertising
Advertisers Index
ASHRAE Journal - December 2009 - ASHRAE Journal - December 2009
ASHRAE Journal - December 2009 - Cover2
ASHRAE Journal - December 2009 - 1
ASHRAE Journal - December 2009 - 2
ASHRAE Journal - December 2009 - Contents
ASHRAE Journal - December 2009 - 4
ASHRAE Journal - December 2009 - Commentary
ASHRAE Journal - December 2009 - Industry News
ASHRAE Journal - December 2009 - 7
ASHRAE Journal - December 2009 - 8
ASHRAE Journal - December 2009 - 9
ASHRAE Journal - December 2009 - 10
ASHRAE Journal - December 2009 - Letters
ASHRAE Journal - December 2009 - 12
ASHRAE Journal - December 2009 - 13
ASHRAE Journal - December 2009 - 14
ASHRAE Journal - December 2009 - 15
ASHRAE Journal - December 2009 - Meetings and Shows
ASHRAE Journal - December 2009 - 17
ASHRAE Journal - December 2009 - Feature Articles
ASHRAE Journal - December 2009 - 19
ASHRAE Journal - December 2009 - 20
ASHRAE Journal - December 2009 - 21
ASHRAE Journal - December 2009 - A Closer Look at Chiller Ratings
ASHRAE Journal - December 2009 - 23
ASHRAE Journal - December 2009 - 24
ASHRAE Journal - December 2009 - 25
ASHRAE Journal - December 2009 - 26
ASHRAE Journal - December 2009 - 27
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ASHRAE Journal - December 2009 - 29
ASHRAE Journal - December 2009 - 30
ASHRAE Journal - December 2009 - 31
ASHRAE Journal - December 2009 - 32
ASHRAE Journal - December 2009 - 33
ASHRAE Journal - December 2009 - Cooling With Less Air: Using Underfloor Air Distribution and Chilled Beams
ASHRAE Journal - December 2009 - 35
ASHRAE Journal - December 2009 - 36
ASHRAE Journal - December 2009 - 37
ASHRAE Journal - December 2009 - 38
ASHRAE Journal - December 2009 - 39
ASHRAE Journal - December 2009 - 40
ASHRAE Journal - December 2009 - 41
ASHRAE Journal - December 2009 - Cooling Concrete: Containerized Water Chilling Plant
ASHRAE Journal - December 2009 - 43
ASHRAE Journal - December 2009 - 44
ASHRAE Journal - December 2009 - 45
ASHRAE Journal - December 2009 - 46
ASHRAE Journal - December 2009 - 47
ASHRAE Journal - December 2009 - Geothermal for Community Center
ASHRAE Journal - December 2009 - 49
ASHRAE Journal - December 2009 - 50
ASHRAE Journal - December 2009 - 51
ASHRAE Journal - December 2009 - Anniversary Feature: Air-Recovery System Versus Conventional Air Conditioning
ASHRAE Journal - December 2009 - 53
ASHRAE Journal - December 2009 - 54
ASHRAE Journal - December 2009 - 55
ASHRAE Journal - December 2009 - 56
ASHRAE Journal - December 2009 - 57
ASHRAE Journal - December 2009 - 58
ASHRAE Journal - December 2009 - 59
ASHRAE Journal - December 2009 - 60
ASHRAE Journal - December 2009 - 61
ASHRAE Journal - December 2009 - Technical Topics
ASHRAE Journal - December 2009 - 63
ASHRAE Journal - December 2009 - 64
ASHRAE Journal - December 2009 - New Product Preview
ASHRAE Journal - December 2009 - 66
ASHRAE Journal - December 2009 - 67
ASHRAE Journal - December 2009 - 68
ASHRAE Journal - December 2009 - 69
ASHRAE Journal - December 2009 - 70
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ASHRAE Journal - December 2009 - 112
ASHRAE Journal - December 2009 - 113
ASHRAE Journal - December 2009 - Products
ASHRAE Journal - December 2009 - 115
ASHRAE Journal - December 2009 - 116
ASHRAE Journal - December 2009 - Emerging Technologies
ASHRAE Journal - December 2009 - Washington Report
ASHRAE Journal - December 2009 - 119
ASHRAE Journal - December 2009 - People
ASHRAE Journal - December 2009 - Special Products
ASHRAE Journal - December 2009 - 2009 Feature Articles Indices
ASHRAE Journal - December 2009 - 123
ASHRAE Journal - December 2009 - 124
ASHRAE Journal - December 2009 - 125
ASHRAE Journal - December 2009 - Classified Advertising
ASHRAE Journal - December 2009 - 127
ASHRAE Journal - December 2009 - Advertisers Index
ASHRAE Journal - December 2009 - Cover3
ASHRAE Journal - December 2009 - Cover4
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