Waterside economizer design software

Clearesult critical systems design build case study. The heat transfer and pressure drop correlations are continually improved as a result of our ongoing research. Metasys building automation and controls software application controller configuration tool. Economizer design software features firecad economiser design software is a windows based user friendly design software. For example, assume the leaving discharge air temperature from the chilled water coil is 55 f. An air economizer can reduce data center power consumption by leveraging cooler outdoor air temperatures to cool the hardware and facility. Also when the hydronic economizer is working the cooling tower condenser water temperature is allowed to go below its specific. Climatemaster announces new water side economizers available for t c large units. Limiting chiller operationa practice dubbed free coolingis intriguing, for reducing the number of hours of chiller operation has a larger impact on lowering energy use in a facility than by selecting a more energyefficient chiller sorell, 2007. Air economizer controls shall be capable of integrated operation where economizer operation and mechanical cooling can occur simultaneously when needed to meet the cooling load.

Water side economizers are an integral addition to any building that uses air or water chillers as its cooling system. Oklahoma city, ok climatemaster is proud to announce availability of the water side economizer wse option for our larger tc units sizes 072 300. An economizer is a unit that captures heat from the stack, and then returns it to a water system. Modeling waterside economizers in trace trane commercial.

Unlike airside economizers, waterside economizers can be economically retrofitted. It works by passing air through a coil cooled by loop water rather than through a coil cooled by mechanical refrigeration. All of the people involved in the project are sure to understand, visualize, and explore our design to. Based on this analysis, there is demonstrated savings from using a waterside economizer in all the analyzed climate zones. In addition, we use the latest software when it comes to creating these detailed blueprints. According to energy star, that threshold is 3000 hours or more, which covers a pretty large swath of the country. Aquazone constant volume watercooled vertical water source heat pump 50pcv. Hourly analysis program carrier carrier commercial north. Hvac economizers 101 principles and operations for efficiency. The waterside economizer requires a winterized cooling tower in many climates. Were an expert team of technical designers, so you can definitely rely on our years of mep design experience. The waterside economizer sequencer module is designed to automatically switch the central plant between chiller mechanical cooling and waterside economizer cooling with minimal disturbance to flows and to the chilled water supply temperature. Mar 01, 2017 in climate zone 3, the design cooling coil often is adequate to meet the waterside economizer requirement. Our bimready product models help you reduce risks and improve the flow of your water side economizer project.

Designing your water side economizer is the foundation to ensure that the whole project runs in a fast, efficient, and productive way. Jun 11, 2014 stulz story of innovative economizer cooling. Sep 01, 2002 a waterside economizer system can go a long way in achieving project design goals where an airside economizer is impractical for such applications as data centers, historic buildings, or where structural or aesthetic constraints are an issue. Variable economizer cooling is comprised of a variable fan speed dry cooler with fan speed controlled based on fluid temperature, variable speed pumps controlled based on fluid pressure, and waterglycol cooled free cooling cracs consisting of both a dx and a waterglycol free cooling coil. Identify factors that affect a building load analysis and waterside economizer design decisions and effectively contributing to sustainability and energy performance.

Water side economizers maximize energy efficiency by taking advantage of low building loop temperatures. There are various ways to do this, many of which we explore in our webinar waterside economizers and ashrae 90. Boiler economizers cbw industrial boiler waste heat. Stulz waterside economizer industry leading dx and cw based waterside economizer cooling solutions when selecting a waterside economizer solution the optimal solution is dependent on several factors and preferences including available infrastructure, climate region, redundancy requirements, ability to supportservice different equipment, and. In order to achieve free cooling through a waterside economizer. To remove the economizer, first position the unit, while either still in the shipping container or on the skid, as close to the installation site as possible. Most buildings today use either enthalpy or temperature to determine if outside air can be used for free cooling. The crossflow economizer had lower heat transfer coefficients and was more prone to plugging than the modern vertical economizer. Building codes click to download now w7212 economizer simulator zipped folder technical tips for economizers retrofits on site. Now in our fifth decade in waste heat recovery economizer engineering, etech has encountered and successfully addressed every imaginable economizer and boiler configuration and application of the waste heat recovery products we design, fabricate and install. Economizer heating surface and its outlet flue gas. Such systems include radiant cooling, chilled beams, computer room air conditioners, and fan coil units.

Waterside economizer 3 3way motorized ball valve waterside economizer coil aquastat n. Oct 28, 2014 conclusion in this course of project it came to learn about the design of air preheater and economizer in boiler. Economizers other notable exceptions d systems that include a condenser heat recovery system with a minimum capacity as defined in 6. It works by passing air through a coil cooled by loop water rather than through.

Waterfurnace waterside economizer option allows the use of a buildings interior loop water to provide free cooling. Thermal design of economizer for waste heat recovery. Pump sizing for swse piping configuration, the hydrostatic path through the chiller and heat exchanger in series during the partial waterside economizer generates the highest pressure drop, compared to the operation of mechanical cooling by chiller and full. Integrated chiller economizer technology is ideal for the process chiller replacement and design build markets. Even in the texas heat, clearesults rg loop saved nearly three times more energy than traditional waterside economizer designs. Stulz provides industry leading dx and cwbased waterside economizer cooling solutions detailed in this design guide. An airside economizer is an hvac control system that can provide significant cooling energy savings when properly specified, installed, commissioned, and maintained. The program assumes a waterside economizer is used in an. In climate zones 4 and 5, no combination of cooling coil and cooling tower meets the waterside economizer.

A chiller is a machine that removes heat from a liquid via a vaporcompression or absorption refrigeration cycle. Alternatively, consider a dedicated tower for the lead chiller or an aircooled lead chiller. The 50pcv indoor watercooled heat pump unit with puron refrigerant is designed for vertical installation with a variety of airflow. Boiler economiser sometimes called economizer is the energy improving device that helps to reduce the cost of operation by saving the fuel. Airside economizers use cool outside air directly as a means of cooling the indoor space.

The cre economizer is generally shipped in the position it. Air versus water an airside economizer will ge nerally be more energy effi cient than a waterside economizer, if space. Ratio r this is the ratio t to to t between the rise in temperature of the water and the drop in temperature of the gases. If the waterside economizer can handle the entire cooling load, then it will be used. Rate, simulate, and design air coolers and economizers. A waterside economizer system can go a long way in achieving project design goals where an airside economizer is impractical for such applications as data centers, historic buildings, or where structural or aesthetic constraints are an issue. The cre economizer is generally shipped in the position it is designed to be installed in. An exception is allowed for direct expansion units with a rated capacity less than 65,000 btuh. Both technologies have enormous potential for energy savings. For total system waterside pressure drop add heat pump pressure drop and waterside economizer coil pressure drop.

In boilers, economizers are generally heat exchangers which are designed to exchange heat with the fluid, generally water. A watercooled chiller uses a separate condenser water loop to take away the heat gained in the chillers refrigerant 3 and release the heat in an evaporative cooling tower. A waterside economizer design employs all these design features should be able to prevent cooling tower freezing problem. Identify economizer sensors, controllers, and controlled devices on a miniature or packaged hvac unit. A waterside economizer cannot precool the return flow prior to entering the chillers. Youll notice that in this case we have given the economizer its own dedicated cooling. Controls are straightforward except predicting when the economizer should be enabled which requires knowledge of wetbulb temperature and predicted heat exchanger and cooling tower approaches. At jmp, we advocate piping the economizer in series to meet these new codes. Unfortunately, the economizers collection of dampers, actuators, linkages, sensors, and controllers rarely achieves its savings potential. An economizer will be required because the building is located in climate zone 4a and the. In climate zone 3, the design cooling coil often is adequate to meet the waterside economizer requirement.

During waterside economizer operation, costs of a chilled water plant are reduced by up to 70%. The earliest horizontal economizers had severe plugging problems and were replaced by a crossflow design. Waterside and airside economizers design considerations for. Gas flow distribution or heat transfer into the economizer section is improved through use of guide vanes at inlet of economizer duct.

A dedicated cooling tower, sized perfectly to operate in concert with the economizer eliminates these tricky control issues and leaves you with the operational flexibility that the new code demands. Numerous design variations of waterside economizers typically they utilize a cooling tower and heat exchanger to indirectly cool the chilled water loop, which is used to reject heat from the building via the hydronic coils. This is discussed further in the sidebar, example design procedure page 34. I have a design which has a very specific sequence of operation on its waterside economizer.

The economizer also prevents flooding of the boiler with liquid water that is too cold to be boiled given the flow rates and design of the boiler. Economizers in air handling systems ced engineering. Pump sizing for swse piping configuration, the hydrostatic path through the chiller and heat exchanger in series during the partial waterside economizer generates the highest pressure drop, compared to the operation of. Experiment with a working economizer unit under normal operations and abnormal or failed conditions to help students to determine a solution to the economizer problem for optimum efficiency of the equipment. But with integrated economizer design, this prediction is not critical to reliable plant performance. Economizer applications etech heat recovery systems. The concept of an airside economizer, where the air handler serving a space is used to draw outside air, is commonly being applied in todays commercial office buildings. Our waterside economizer wise is an energysaving system that uses a cooling tower, condenser, water piping, control valves, and water coils to provide cooling without compressor operation. Waterside economizer specification catalog application notes single compressor units with waterside economizers are only available with ecm fan motors and stainless steel drain pans. The economizer in boiler tends to make the system more energy efficient.

In a large data center, a mechanical chiller 1 often provides a continuous supply of chilled water for use in air handling units 2 to cool the data center. While find the heat transfer coefficient of our existing system. In almost all cases, economizer technology offers the highest return on investment when the outdoor ambient temperatures run 510 degrees f colder than process fluid design temperatures. This paper deals with the basic configuration of economizer for waste heat recovery boiler for coke making industries application. Waterside economizer design considerations include proper equipment sizing, cooling tower freeze protection, pump design for parallel and series configuration, and control strategies for system. Xace is an incremental program that rates, simulates, and designs crossflow heat exchangers, such as air coolers and heat recovery bundles. The chiller adds a heat exchanger to the system, so condenser flow rises enough to support another tower cells flow. Aquazone constant volume watercooled vertical water source heat pump. This innovation, which can be integrated into our dedicated outdoor air systems, is often referred to as free cooling. Hvac economizers 101 principles and operations for efficiency greg jourdan, wenatchee valley college, srinivas katipamula, ph. Economizers and energy recovery wheels are alternative energy strategies, but choosing between them isnt like flipping a coin the two components are actually two sides of the same coin.

For example, a system designer is specifying a watersource heat pump system and the largest heat pump will be a 5 ton 60,000 btuhr, 17. In climate zone 3, tradeoffs between cooling coil robustness and cooling tower size can provide an optimized solution. Air versus water an airside economizer will ge nerally be more energy effi cient than a waterside economizer, if space humidity is not required to be tightly controlled. The installation of a boiler economizer helps to solve this problem. The stateoftheart stulz dynamic economizer cooling solution represents an exciting new approach with proven results. For data centers with water or aircooled chilled water plants, a waterside economizer uses the evaporative cooling capacity of a cooling tower to produce chilled water and can be used instead of the chiller during the winter months. Using this module, engineers can design a wide variety of economisers for fired boilers, waste heat boilers, hrsgs and for other hot gas sources of chemical plants. In a typical scenario, air economizers draw in cool air from outside and expel hot air generated inside the facility outdoors, instead of cooling and recirculating the hot air from servers. To determine if a boiler economizer is right for your facility, look at your annual boiler fuel bill and subtract 5 to 10% of the cost. Design and application guide for honeywell economizer controls. Approach there are several approaches to applying waterside economizers to systems without airside economizers. With new advances in technology and design strategies, there are many ways to further enhance wshp system efficiency. Controlling a hydronic economizer in energyplus unmet hours. The chart to the right summarizes the parameters that are used to measure the temperature and moisture characteristics of air.

The module uses a finite state machine to accomplish transitions between ni. Designing waterside economizer piping to meet ashrae 90. A common application of economizers in steam power plants is to capture the waste heat from boiler stack gases flue gas and transfer it to the boiler feedwater. Waterside and airside economizers design considerations. This design guide will develop why economizers are necessary, illustrate various designs of economizers, and focus on the latest leadingedge solution of stulz dynamic economizer cooling including controls, and provides hard data on the tremendous value and cost savings that can be achieved. By combining both tools in one package, significant time savings are achieved. One benefit is the ability to precool the return chilled water from the system before the water enters the cooler. Though geography and site conditions can present hurdles, this concept can be used in data centers to provide a lowcost alternative for cooling the data center both at night. Then attach a lifting hoist to all the lifting lugs located on the top lid or cone. Dual compressor units with waterside economizers may require a higher static blower package to compensate for the added pressure drop. Waste heat recovery application, economizers, ppsd software, thermal simulation. This is usually a combination temperature and relative humidity sensor with software or electronics that converts. F 020 40 6080 100 0 20 40 60 80 100 250 200 150 100 50 0 central plant tonhrs number of hours tonhrs annual hrs operating hrs figure 1. Associate the major components of a chilled water system that integrates a waterside economizer with their operation.

Depending on design conditions, economizers can provide up to 100% of cooling load requirements. This would be used with an open cooling tower is often referred to as a nonintegrated economizer, because the chillers are locked out when the plant is in economizer mode. Climatemaster expands commercial product line with. With the global headquarters in racine, wisconsin, and manufacturing facilities in buena vista, virginia, as well as west kingston, rhode island, modine is a core manufacturer and producer of many integrated heating and cooling solutions for the hvac industry. Economizers for process chillers legacy chiller systems, inc. Jan 01, 2010 a waterside economizer design employs all these design features should be able to prevent cooling tower freezing problem. Economizer allows the planning of travel costs, dock entry for maintenance and comparison of different ships to see which ones are most suitable. Unlike its traditional counterpart, water side economizers are much more efficient and costeffective. Continuing education gbci, aia, pdh application manuals. Aquazone constant volume watercooled vertical water source. Utilize free cooling to reduce carbon emissions while lowering operational cost with waterside economizers.