Radiant Ceiling Panels

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1 Radiant Ceiling Panels Radiant ceiling panels provide uniform, draftless heating which allows utilization of the total interior, even locations where occupants are seated adjacent to large areas of glass. The elimination of wall mounted units allows for unobstructed walls that gives maximum design flexibility to the Architect. Radiant panels do not rely on the movement of air but rather transfer energy directly to any building surface the panel sees in much the same way that light energy from a light fixture illuminates the room. The uniformity of temperature long associated with radiant systems comes from the natural absorption and re radiation of energy between all interior surfaces. Unlike convection heat, which is really a current of warm air, radiant heat does not rise. To understand the effectiveness, think of the invigorating effect of the sun s rays on a cool but sunny day. The sun s rays provide a sensation of warmth. If a cloud passes over blocking the sun s rays your body has the sensation the temperature dropped; although in a short interval the air temperature does not change at all. Thermal comfort as described by ASHRAE standard is that condition of mind which expresses satisfaction with the thermal environment. The critical design parameter for a radiant ceiling system is the difference between the mean panel temperature and the average unheated temperature of all surfaces within the space. If the average unheated surface temperature and the temperature of the room equal the mean panel temperature there will be no net energy exchange. When the average unheated temperature falls below the mean panel temperature the panels radiate energy into the room. The energy radiated first warms the surfaces which in turn warms the air.

2 It has been well established that the mean radiant temperature within a space is one of the most important factors influencing occupant comfort. As the Airtex radiant panels effect the mean radiant temperature directly by raising the surface temperature in the space, they provide occupants superior control of comfort conditions To design a system room loads should be calculated in the normal manner, using the procedures set forth in the ASHRAE Guide. The design of a radiant ceiling perimeter system follows the usual design for re circulating water systems which incorporate remote terminals for space heating. Piping and controls are similar to those used with conventional perimeter hot water systems. As Airtex radiant ceiling panels raise the mean radiant temperature in the space they afford occupants greater thermal comfort at ambient temperatures lower than those required with convective systems. Accordingly, an inside dry bulb design 3 to 4 degrees below that normally used with convective systems is recommended. For additional information on Airtex radiant ceiling panels, please contact your Michigan Air Products sales representative or visit airtexradiantpanels.com. 3/section1.htm

3 New From Price New - Price Chilled Beam Calc Add Confidence and Speed to your Chilled Beam Selections! Making the correct chilled beam selections is uncertain territory for many engineers who are utilizing the technology for the first time. Beam selection tools that are currently available on the market require comprehensive knowledge of hydronic systems before they can add any true value to the selection process. Price took note of the discrepancy between knowledge levels and resources available, and will be releasing Chilled Beam Calc in July The Chilled Beam Calc software has been designed to help reduce the learning curve by making selections easier and helping to ensure that your final beam selection best meets the Price ACB2 Active Chilled Beam performance needs of the project. Chilled Beam Calc is the only chilled beam selection software that allows you to prioritize the design factors that are important to project, and then return to you a list of options ranked according to your preferences. This capability can both expedite and add a new level of confidence to your final selection. This unique Ranking Engine allows you to assign priorities to the following factors (Ranging from Very Important to No Preference ): Capacity Fluid Flow Airflow Water Pressure Drop Air Pressure Drop Sound Power Relative Cost By ranking the possible selections according to project priorities your final selection is not only easier to make, but a significant amount of time has been saved. Those with more experience selecting beams will also find this tool valuable,

4 however individuals that want to skip the ranking step may do so. New From Price Chilled Beam Calc features an easy to use, intuitive interface that also allows you to create exportable schedules once your final selection has been made. Price will integrate this currently stand alone tool into their All In One Software later in 2010, and will follow up with the Chilled Beam Room Designer software. The beta version of Chilled Beam Calc will be available for download from hvac.com in July For additional information, please contact your Michigan air Products sales representative. 3/section2.htm

5 Hybrid Geothermal Using the ground as a thermal energy source and/or a heat sink for heat pumps has long been recognized as having several advantages over using ambient air as the heat sink/energy source. Ground temperatures at a 3 ft depth are much less variable than ambient air temperatures. In addition, the temperature of the ground during the coldest winter months is generally warmer than the ambient air and is usually cooler than the ambient air during the warmest summer months. This results in improved energy efficiency for the heat pump. There has been significant growth in the application of these systems, but geothermal systems still account for only a few percent of the total market. This is due in part to the high cost of installing the necessary ground loop. In a typical geothermal heat pump (GHP) system like the one shown below, the ground loop heat exchanger is bored, either vertically or horizontally and eliminates the need for a cooling tower and boiler. However, the drilling of a bore field is quite expensive and for larger commercial building, especially those in warmer climates, cooling loads will typically be much larger than the heating loads. This imbalance can result in a ground temperature increase over time, which will reduce the system performance. The ground heat exchanger can be oversized to postpone or eliminate this temperature increase, but this will result in a higher system first cost. An alternative is to implement a hybrid GHP design. In hybrid GHPs, the ground heat exchanger size is reduced and an auxiliary heat rejecter (Cooling Tower) in warmer climates or an auxiliary heat source (Boiler) in colder climates are added to handle the excess loads that the ground loop can not handle. Since the ground heat exchanger loop can be sized for part load conditions, the first cost is substantially less since the bore field size is significantly reduced.

6 The extent that the ground loop can be reduced will vary with location and climate. Hybrid GHPs can also be used in areas where there isn t enough space to install a full ground water heat exchanger loop or the geological conditions of the installation area prevent it. As shown in the table below, substantial savings can be realized in using hybrid GHP systems. In this case, the idea to use a hybrid system was driven by the tight footprint of the site. Payback was estimated at 5.7 years for the full geothermal system and 2.2 years for the hybrid system. While hybrid GHPs do not always lead to lower energy use than a traditional GHP system, the economic benefits of a significantly smaller bore field and less chance of system performance deterioration due to load imbalance make the system attractive for many different applications. For more information on the application and design of these systems, please contact your Michigan Air Products sales representative.

7 Armstrong IPC Chilled Water Plant Control The new integrated plant control system from Armstrong is designed to assist engineers and chilled water plant operators in creating and controlling a chilled water plant with; improved energy efficiency, longer equipment life and lower noise, and inherently stable control algorithm. The Armstrong IPC goal of achieving better than 0.45 kw/ton (7.8 COP) operating efficiency for an annual average exceeds today s best-in-class levels of 0.75 kw/ton (4.7 COP) for water cooled systems. Hartman LOOP methodology is utilized in order to maximize the benefits of all variable speed plant design. The Hartman LOOP technology is a patented and proven control method for operating variable speed chilled water plants, and has been successfully installed across North America for over 5 years. The IPC is competent at controlling both variable primary flow (VPF) and variable primary-variable secondary (VPVS) system configurations. The system architecture for the IPC is based on serial communication between a network of three control panels; The IPC master panel, the IPC 3500 chiller and pump control panel, and the ITC 3600 integrated tower control panel. To optimize the chilled water plant for the HVAC characteristics of a part load application, the IPC system will employ the Hartman LOOP Natural Curve sequencing logic to ensure that the variable speed chillers and system components are always operating as close as possible to their maximum efficiency for an given entering condenser water temperature (ECWT) or ambient air temperature. To achieve the optimum ECWT, the IPC 1150 maintains the greatest active surface area on the cooling towers by slowing down the condenser water pump and tower fan, as opposed to staging off cooling towers. Combining this with the Hartman LOOP patented demand-based control algorithm results in one of

8 the most stable systems conceivable. Please note that energy savings can also be gained on air-cooled systems. To learn more, please check out or

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