Types of evaporative coolers direct evaporative coolers use a fan to pull outside air through media pads that are kept. Designed to maintain precise temperature and humidity levels. This multicell hybrid unit has extended surface fins and an adaptive control system capable of pump staging. Cool bricks for hot and dry climates to cool interiors of. The direct evaporative cooling system adds moisture to the cool air, while. Pdf evaporative cooling is a wellknown system to cool the environment. Contract management training for contract management to be effective, project directors need not only a strong knowledge of the basics, but also a detailed practical understanding of commercial and legal dimensions of contract management. May 30, 2019 contract management, a part of the project management, deals with the vendorsellersupplier as termed in the contract. Pot designs these are simple designs of evaporative coolers that can be used in the home. Pdf design and construction of an evaporative cooling. The design will depend on the materials available and the users requirements.
This contract performing the professional project management. Evaporative cooling is a physical phenomenon in which evaporation of a liquid, typically into surrounding air, cools an object or a liquid in contact with it. Performance evaluation of alternative evaporative cooling media. A passive downdraft evaporative cooling pdec tower is a component that is designed. Pdf a solar powered evaporative cooling system of 0. Water can absorb a lot of heat without changing phases, allowing it to remove heat. Closed circuit cooling towers provide evaporative cooling for many types of. Evaporative cooling design guidelines manual iv this report by nrg engineering is funded by the new mexico energy minerals and natural resources department, 1220.
This multicell hybrid unit has extended surface fins and. Evaporative cooling occurs when air, that is not too humid, passes over a wet. The best time to measure wet bulb temperature to calculate the potential cooling performance of the evaporative cooling system is in. It also manages the procurements according to the terms and conditions set in the contract. This phase change requires energy, which is called latent heat of evaporation this is the energy required to change a substance from liquid phase to the gaseous one without temperature change. Projected benefits of new residential evaporative cooling. Evaporative cooling designing buildings wiki share your construction industry knowledge. When warm, dry unsaturated air is pulled through a watersoaked pad, water is evaporated and is absorbed as water vapor into the air. It reduces the storage temperature and also increases the relative humidity within the. Types of contract inproject management ali heydari. A cooling tower is a heatrejection device, which discharges warm air from the cooling tower to the atmosphere through the cooling of water. Some examples of evaporative cooling designs are described below.
Part of this research program investigated combinations of dehumidification and evaporative cooling in solardriven hybrid desiccant cooling systems. Evaporative cooling systems use the same principle as perspiration to provide cooling for machinery and buildings. The contract type basically is the format on how the. During hot and humid days this type of air conditioning. This manual is not intended to be allencompassing and thoroughly definitive. Design and performance evaluation of an evaporative. Manual arts workshops construction areas and home economics food. It can be necessary to provide cooling to buildings during warm weather, or where there are significant thermal gains such as solar gain, people and equipment.
Selfsustaining cooling system worcester polytechnic institute. This cooling is sometimes referred to as comfort cooling. Many households use conventional cooling systems as a backup to their evaporative cooling systems during these periods. The terms are quite straightforward and easy to understand. Jul 10, 2015 contract management training for contract management to be effective, project directors need not only a strong knowledge of the basics, but also a detailed practical understanding of commercial and legal dimensions of contract management.
The main advantages of using both types of evaporative cooling systems are the lower supply air temperature, increased reliability and more available comfort hours. Largest evaporative air conditioning contract in the world delivered by seeley international. Direct evaporative cooling is an adiabatic process where the dry bulb temperature is lowered without changing the amount of heat idec dec dec idec in the air. Insulated evaporative cooling temperature difference. Very good agreement between the measured outlet temperature and.
Evaporative cooling systems, which dont need potable water, are a good use of recycled water. Evaporative cooling in evaporative cooling process, both temperature and humidity of air changes along the lines of constant wet bulb temperature shown as line ab. As a project manager, you should be aware of the different types of contracts and the legal aspects of projects. Evaporative cooling design guidelines ced engineering. In many cases this is flue gas from a combustion process. The project or contract manager is primarily concerned with the direction and motivation of other human beings. In summary, evaporative cooling is the process of removing heat from a surface due to the evaporation of water. Guide notes for schools, tenderers and installers department of. Primary air is cooled further with direct evaporative cooling. What will enable most efficient and effective management of the risks of the project.
Phase change or phase transition is the transition of a system from one state of matter to another by heat transfer. Types of contract in project management slideshare. This research project will take the product lines to another level of thermal performance, water use optimization, and control software optimization. Evaporative cooling design guidelines manual iv this report by nrg engineering is funded by the new mexico energy minerals and natural resources department, 1220 south st. Development of innovative technologies for cooling, waste. Contract managers can seek to enhance value, regardless of the model. Principles and application of evaporative cooling systems. Cooling systems for buildings designing buildings wiki share your construction industry knowledge. Evaporative cooling is based on the thermodynamics of evaporation of water, i.
Heat exchangers a heat exchanger, shown in figure 1. The dynamic process of government contracting is composed of complex management. Furnish proof satisfactory to the owner or his representative, of. Cooling tower management cooling towers dissipate heat from recirculating water used to cool chillers, air conditioners, or other process equipment to the ambient air. This change management process is similar to the change management process used with the project agreement with the project client. The systems design was based upon the humidifying capacity of an ultrasonic humidifier supplied by a quebec company, plastique frapa inc.
For example, from a solid to a liquid melting or from a liquid to a gas evaporation. The contracting plan of the project supports the procurement approach of the project. The contract type is the key relationship between the parties engaged in the business and the contract type determines the project risk. Oct 04, 2019 as a project manager, you should be aware of the different types of contracts and the legal aspects of projects. The two common types of evaporative cooling units are the direct and indirect units. Installation and maintenance of evaporative cooling system. What type of contract would you use for the thirdparty service provider. The following are some factors to consider when selecting the type of contract. Climate wizard assisted premium winemaker in producing their famous wine. Table of contents why should we know types of contract.
Evaporative coolers with dry capability broaden the mechanical landscape a multicell hybrid unit is shown with extended surface fins and an adaptive control system capable of pump staging. Contract types and contract management seminar presentation. It is used in data center and large it facilities to provide air cooling conditioning services. Imagine having to outsource a process or product to thirdparty subcontractors or vendors in the middle of your project. Project contract types learn project management concepts using simple and precise free downloadable tutorials. Indirect evaporative cooling research project launched. Prepare for pmi certification and ject, the owner must decide what type of contract. Testing of the evaporative cooling section include several types of tests. International journal of engineering research and general.
Primary air stream is sensibly cooled first with indirect evaporative cooling using a one side wet, cross counter flow heat exchanger. Pros reduce peak cooling demand for both evaporative cooling less energy by 14 over an ac system installation costs can be less than or equal to ac systems better air quality humidity control available with indirect equipment it is simple technology evaporative condensing. Feb 10, 20 types of contract in project management 1. Cool bricks masonry walls can be filled with water which passively cools the interiors of our homes.
Evaporative cooling, effectiveness, performance, energy saving. The aztec, and alton dec, evaporative cooling products have been used in the industrial and large commercial market since 1946. The water then evaporates, cooling the system rapidly as the energy is used to change the water from liquid to gas. When evaporative processes are used to cool an element of the building, which then acts as a heat sink, this is known as indirect evaporative cooling. Analysis of advanced solar hybrid desiccant cooling. Analysis of advanced solar hybrid desiccant cooling systems. Jan 01, 2010 california project contract number 500. What is the role of each type of contract in project. In evaporative gas cooling, a mist of water is sprayed into the hot gas.
Jan 09, 2018 evaporative coolers with dry capability broaden the mechanical landscape a multicell hybrid unit is shown with extended surface fins and an adaptive control system capable of pump staging. Evaporative cooling products baltimore aircoil international. Hvac contractor qaqc plan sample selected pages not a complete plan part 1. In this paper different cooling pads have been studied. Technical information for cooling towers using recycled water. Design and construction of an evaporative cooling system for the storage of fresh tomato research pdf available march 2016 with 4,975 reads how we measure reads. Evaporative cooler engineering specification 598 1. Contract management, a part of the project management, deals with the vendorsellersupplier as termed in the contract.
In the direct evaporative cooler dec, the air comes into direct contact with water. This section describes the materials of construction available for bac products. Fixed price lumpsum this is the simplest type of all contracts. The terms and conditions are agreed mutually between the buyer and seller. It will consist of the component parts as listed in the following sections.
Design and performance evaluation of an evaporative cooling. For projects of all types di fferent co ntracts will be structur ed, ne gotiated, con cluded and fulfilled. The basic design consists of a storage pot placed inside a bigger pot that holds water. The best time to measure wet bulb temperature to calculate the potential cooling performance of the evaporative cooling system is in the afternoon. The following considerations were made during construction of this project. Construction management or construction project management cpm is the overall planning. Course contents evaporative coolers, often called swamp coolers, are cooling systems that use only water and a blower to circulate air. Performance evaluation of alternative evaporative cooling. Fan and pad greenhouse evaporative cooling systems 2 frequently drift out of calibration and should be checked against standards on a regular basis.
Principles and application of evaporative cooling systems for. Evaporative cooling is widely used in hot and dry regions. This adiabatic cooling process is also used to create the chilled water that feeds our indirect evaporative cooling coil. Evaporative cooling is a type of environment cooling techniques that cools the surrounding air using water evaporation technique. Projected benefits of new residential evaporative cooling systems. Improvement the performance of a direct evaporative cooler. Types of contract inproject management ali heydari 2. Let have a look at most widely used contract types. There is no change in heat content and the energy is merely converted from sensible energy to latent energy. The heat from the primary air is transferred to a small amount of ambient scavenger air 3. The evaporative cooling systems has prospect for use for short term preservation of fruits and vegetables after harvested. In the hvac industry, the term cooling tower is used to describe both open and. Over those 66 years the products have been refined and optimized.
Cooling systems for buildings designing buildings wiki. Cooling may also be necessary for refrigeration or for some industrial. Cool bricks uses process of evaporative cooling to cool buildings during hot and dry climates. Cooling is provided whilst keeping the evaporative process outside, which avoids elevating the indoor humidity level.
Pdf design and optimization of an active evaporative cooling. Process gas cooling nozzles evaporative cooling nozzles. The evaporative cooling module shall be selfcontained. Direct and indirect evaporative air cooling components are commonly packaged together in the same cooling unit by the manufacturer. Apr 27, 2018 evaporative cooling designing buildings wiki share your construction industry knowledge. It is the purpose of this manual to provide engineering and application data to.
369 804 636 636 1577 1196 1115 1089 874 31 1302 1488 1101 897 904 885 617 42 1282 432 911 1276 150 735 141 563 89 839 417 416 740 692 240 493 350