PACKAGED ENVIRONMENTAL UNIT

Transcription

1 TECHNICAL MANUAL SERIES ECH115 PACKAGED ENVIRONMENTAL UNIT WITH EVAPORATIVE COOLING & DIESEL FURNACE HEATING 1

2 CONTENTS PAGE NO: 1. Introduction Components Details Safety Devices Technical/Design Specs Design Specs of Evaporative Cooling Media Elect Data Parts/Spare Parts(With Codes) Catalog Drawing 26 2

3 1. INTRODUCTION DIRECT EVAPORATIVE COOLING AND INDIRECT FIRED CUSTOMIZED AIR HANDLING UNIT Evaporative Cooling Evaporative cooling is a process that uses the effect of evaporation as a natural heat sink. Sensible heat from the air is absorbed to be used as latent heat necessary to evaporate water. The amount of sensible heat absorbed depends on the amount of water that can be evaporated. Evaporative cooling can be direct or indirect; passive or hybrid. In direct evaporative cooling, the water content of the cooled air increases because air is in contact with the evaporated water. In indirect evaporative cooling, evaporation occurs inside a heat exchanger and the water content of the cooled air remains unchanged. Since high evaporation rates might increase relative humidity and create discomfort, direct evaporative cooling can be applied only in places where relative humidity is very low. Where evaporation occurs naturally it is called passive evaporation. A space can be cooled by passive evaporation where there are surfaces of still or flowing water, such as basins or fountains. Where evaporation has to be controlled by means of some mechanical device, the system is called a hybrid evaporative system. Evaporative cooling is based on the thermodynamics of evaporation of water, i.e. the change of the liquid phase of water into water vapor. 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. When non- saturated air (i.e. air that does not contain liquid water but only water vapor) comes in direct contact with water evaporation occurs. It is obvious that during this process the moisture content of air is 3

4 increased. This process is represented on the psychometric chart by a displacement along a constant wet bulb line, AB. The air to be cooled is initially at point A. The air, as a result of the direct evaporative cooling process, reaches point B. This is a constant wet bulb temperature process and therefore line AB is parallel to the wet bulb temperature lines. When evaporation occurs in the primary circuit of a heat exchanger, while the air to be cooled circulates in the secondary circuit, the air temperature decreases but its humidity ratio remains constant. It must be noted that since the air temperature drops, its relative humidity will increase, but less than during the direct evaporative cooling process. Since the humidity ratio of the air does not change, this process is represented on the psychometric chart by a displacement along a constant humidity ratio line CD. In this figure, the air to be cooled, initially at point C is sensibly cooled by the indirect evaporative cooler until it reaches point B. Direct evaporative cooling" Indirect evaporative cooling" 4

5 Precautions for Direct Evaporating Cooling Evaporative cooling uses large volumes or air. Forcing this volume of air through small ducts, around sharp corners, and out of small outlets, involves ducting costs. In some cases the best duct system is none. Just blow the air into a large daytime occupancy rooms. If not properly designed direct type evaporative coolers may pose the following problems: The cooled air may be excessively humid. The high rate of air flow and large number of air changes, which are necessary for effective cooling, cause large variation in the air speed and the associated thermal sensation within the cooled space. This results in a waste of energy, which has been used to cool the discharged air. What is Evaporative Cooling? Evaporative cooling has made summer more bearable for thousands of years and now 21st century evaporative technology provides effective, economical, environmental friendly and healthy cooling. Evaporative cooling makes you feel chill when breeze strikes your skin. The air evaporates the moisture at your skin and human body provides the heat to evaporate the moisture in the air, this evaporation causes the cooling effect on human body. Evaporative cooling is primarily achieved through direct evaporating cooling or indirect evaporating cooling. With direct evaporative cooling, out side air is blown through a water saturated medium (usually cellulose) and cooled by evaporation (the air passing over the saturated medium is cooled by evaporation). Direct evaporative cooling adds moisture in to the air stream until the air reaches close to the saturation. In direct evaporate cooling dry bulb temperature of the air decreases while wet bulb temperature remains unchanged. The efficiency of direct evaporative cooling depends on wet bulb depression, the difference between dry bulb and wet bulb temperature of the air (DB-WB). This temperature is the total amounts of cooling that can be achieved through evaporative cooling. For example at 100% efficiency the temperature drop of air across the evaporative pad will be equal to wet bulb depression. So the cooling 5

6 efficiency of direct evaporation system increases as the dry bulb temperature increases and wet bulb temperature decreases. The greater the difference between dry bulb and wet bulb temperature of the air, greater will be achievable cooling. With the help of following formulae, achievable temperature reduction while using direct evaporative cooling across the evaporative pad can be calculated. Achievable Temperature drop = (dry bulb temp-wet bulb temp) efficiency of media. Example- Dry bulb temp of air= 95F, dry bulb temp of air =66F, efficiency =82%. Leaving air dry bulb temperature will be= =71.3f. Evaporative cooling is healthy and comfortable because it Bring in fresh air and exhaust stale air, smoke and odors. Does not need an air tight structure for maximum efficiency, so building occupants can open the door and windows. * The direct evaporative cooling does not perform well if the wet depression is small. What s so great about evaporative cooling? Evaporative cooling is economical, effective, environmentally friendly, and healthy. Economical Evaporative cooling is economical because it: Reduces DX/chilled water cooling requirements for fresh air. Cuts mechanical cooling costs 25% to 65%. Provides 100% make-up air cooling at half the cost of mechanical equipment cooling. Increases existing equipment cooling capacities without adding mechanical cooling. Increases compressor life. Increases heat exchanger life. Effective Evaporative cooling actually becomes more effective as the temperature increases just when DX air conditioning becomes less effective. Evaporative cooling works in all areas of the country, not just in hot, dry climates. Although the Pacific Northwest is certainly damp in winter, it is dry in summer. In fact, humidity in this region of the country almost always decreases proportionally as the temperature increases. So the cooling power of evaporative systems increases as the temperature increases. 6

7 Environmentally friendly Because evaporative cooling does not use chlorofluorocarbons (CFCs), it does not contribute to ozone depletion. Healthy Evaporative cooling is healthy and comfortable because it: Brings in outside air and exhausts stale air, smoke, odors, and germs. Helps maintain natural humidity levels, which benefits both people and furniture and cuts static electricity. Does not need an air-tight structure for maximum efficiency, so building occupants can open doors and windows. What kind of temperature reductions can I expect with evaporative cooling? The greater the difference between the wet bulb and dry bulb temperatures, the greater the achievable temperature reduction. Here s how to calculate temperature reductions achievable with direct, indirect, indirect/direct, and indirect/indirect evaporative cooling. These examples use a starting dry bulb (DB) temperature of 86 o and wet bulb (WB) temperature of 66 o. Temperature reduction achievable using direct evaporative cooling NOTE With direct evaporative cooling, the dry bulb temperature is reduced while the wet bulb temperature remains the same. 1. Temp drop achievable = (dry bulb - wet bulb ) x (efficiency* of the media) Example: (86 o - 66 o ) x.9 = 18 o 2. Achievable temp = dry bulb - temp drop achievable Example: 86 o - 18 o = 68 o DB/66 o WB** 3. Starting DB: 86 o Ending DB: 68 o 7

8 *Efficiency is usually 90% **because cooling is achieved by adding moisture to the supply air stream, the new dry bulb/wet bulb temperatures are found on the wet bulb gradient. NOTE Refer to Appendix A for more information on using psychometric charts to calculate temperature reduction using evaporative cooling. Appendix A:Psychrometric Chart Psychrometry is the study of moist air and the changes in its conditions. The psychrometric chart graphically represents the relationship between air temperature and moisture content and is a basic design tool for mechanical engineers and designers. You can represent psychrometric processes (that is, any changes in the condition of the atmosphere) on the psychrometric chart. Common processes include: Sensible cooling/sensible heating Cooling and dehumidification/heating and humidification Humidification/dehumidification Evaporative cooling/chemical dehydration Figure 1 shows a basic psychrometric chart. Figure 1 Psychrometric chart The following sections explain using a psychrometric chart to calculate how much you can reduce dry bulb temperature using direct, indirect, indirect/direct, and indirect/indirect evaporative cooling. 8

9 Using a psychrometric chart to calculate the dry bulb temperature possible with direct evaporative cooling NOTE With direct evaporative cooling, the dry bulb temperature is reduced while the web bulb temperature remains constant. 1. Start with the dry bulb (DB) and wet bulb (WB) design conditions for the location you are interested in. For example, Portland s 1% design conditions are 86 o DB/66 o WB F. NOTE The ASHRAE handbook Fundamentals contains design conditions. Find where 86 o on the dry bulb line intersects with 66 o on the wet bulb line (see Figure 2). That is the starting point. 2. Figure 2 Starting point 3. Calculate the temperature drop achievable using the following formulas. Figure 3 graphically represents the process. Temperature drop achievable = (dry bulb - wet bulb) x (efficiency of the media) Example: (86 o - 66 o ) x.9 = 18 o Achievable temperature = dry bulb - temp drop achievable Example: 86 o - 18 o = 68 o DB NOTE Because cooling is achieved by adding moisture to the supply air stream, the new dry bulb/wet bulb temperatures are found on the wet bulb gradient. 9

10 Figure 3 Direct evaporative cooling 4. Starting temperatures : 86 o DB/66 o WB Ending temperatures: 68 o DB/66 o WB Where can I use evaporative cooling? In many locations and for many applications, evaporative cooling is all the cooling required to maintain a comfortable indoor environment. In hotter areas or where cooling loads are high, such as in office buildings, one of the most useful applications for indirect evaporative cooling is supplementing a chiller or DX system. By cooling the air stream before it reaches the cooling coil, an indirect evaporative unit extends chiller life, cuts energy costs, and provides the boost the chiller needs to function effectively on hot days. You can add an indirect evaporative cooling unit to an existing system or design a new cooling system that incorporates the indirect unit with the chiller or a standard roof-top DX system. How much tonnage can I save using supplementary indirect/indirect evaporative cooling? Example conditions Required outside air volume: 10,000 CFM Required refrigeration tonnage to meet building cooling load: 25 tons Formula Tons saved = [1.08] [1% Design delta T] [efficiency] [CFM]/12,000 Indirect Fired Heating In winter the out door temperature most often falls to -15C (5F), in this condition no conventional heating system can be performed and normally fail to provide comfort indoor condition. The solution for comfort heating in ice up winter is indirect fired heater (heating furnace). With this technology using burner oil, oil or gas is burnt in special designed heat exchanger causing the surface of heat exchanger very hot, and the cold air is heated after passing the hot surface of heat exchanger i.e. passing air 10

11 over the heat exchanger becomes hot and is further supplied to the required area. Normally the heat exchanger are capable to rise the air temperature to 32 C(90F) and there special design do not permit the combustion gases to mix in the air and all the time healthy air is supplied to the room. Indirect fired heating technology is the most economical than any other heating option such as electric heating and heat pump equipment. Sabro Packaged Environmental units are designed with Evaporative Pad Cooling system for operation during Hot Summer Season and Diesel Furnace heating for Operation during Cold Winter Season. The cooling is performed by spraying water on the cooling pads, when hot air passes through cooling pads it is cooled down by evaporating the water. The heating is performed by direct fired burner, the hot fumes pass inside the furnace pipes, when cold air passes over the furnace pipes it is heated up. The fuel used in burners is diesel. The weather proof design of the unit permits its installation out side of the building either on ground level or on the roof. These units are completely assembled, internally wired and factory tested for rapid installation. The only work required at site is to mount the unit at place, connect with the ducting, electric power supply and makeup / drain water connections etc. The units are provided with all necessary safety and control devices for dependable and trouble free operation and tested at factory for reliability. The units are used for both cooling & heating operations. The cooling & heating operation is controlled through unit s operation panel. During cooling cycle, the unit will be operated on 100% fresh air (Controlled through dampers). The hot air passes through the evaporative cooling pads and cooled down for supply to the area. During mild season (When no cooling or heating is required), the unit can be used to circulate the fresh air without operating cooling or heating system. Only fan will be running to circulate the fresh air. During heating cycle, the unit will be operated on 100% re-circulated air (Controlled through dampers). The cold air from the space will come to the 11

12 unit and passes through the diesel furnace and heated up for supply to the specific area. The maintenance of unit is very easy, all electrical components, furnace section, cooling media section, piping, wiring and fan/drives etc. are accessible by opening front and side access panels. Sections Details The direct evaporative cooling and indirect fired heating equipment consist of following parts! Sections, Bird screen at air inlet Out door air filter section Direct evaporative cooling section Out door air dampers, Return air damper, Return air filter section. Space for DX coil, Fan and motor section Indirect fired heating Furnace. Supply air duct connection Return air duct connection. Bird Screen It is provided at air inlet to protect the foreign particles such as paper, leaves and birds feathers to accumulate on the surface of out door air filters, to ensure 100% filtration area. Out Door Air Filter Section Direct evaporative cooling utilizes all out door air. Wash able aluminum filters with filter section is provided to filter out door air before entering in to evaporative pad. This air filtration minimizes the dust deposits on evaporative pad and increases its life with clean air supply to the space. Direct Evaporative Cooling Section The evaporative cooler consist of following parts and components Stain less steel water sump Water pump to pump the water in to water header Water spray header to spray water on evaporative pad Float valve to be provided in water sump. It maintains water level in water pump Bleed of valve Drain connection Evaporative pad with 85% efficiency 12

13 The out door air passes through the saturated evaporative pad where its temperature is Dropped and supplied to the space where it is desired for some comfort in summer. Out Door Air Damper The out door air dampers are installed at down stream of evaporative cooling section. During evaporative cooling operation this damper is kept fully open to allow out door air flow. The out door is also utilized to introduce fresh air during heating operation. Return Air Damper During winter heating, room air is re circulated over the air Furnace. For this purpose return air damper is provided with duct connection. During heating cycle return air damper is kept open for re circulation of room air and out door damper is kept partially open for fresh air intake. Return Air Filter For the filtration of re circulated room air, a set of washable aluminum filters is provided after return air damper. So these filters filter the air during heating operation. Space For DX Coil If it is required to lower the supply air temperature during direct evaporative cooling. An additional DX coil in the down stream of evaporative cooling is provided. The space is provided after return air filter section for installation of DX chilled water coil. Fan and Motor The fan and motor are main parts of the equipment, it circulate the desired air flow into the space. The fan and motors are selected to match the design requirements of air flow and external static pressure. The fan and motors assembly is mounted on rubber with vibration isolators to minimize transmission of vibration to the building. The fan is statically and dynamically balanced before installation in the unit. The motor used is totally enclosed fan cooled. 13

14 Indirect Fired Heating Furnace Indirect heating Furnace equipped with 2- stage burner. Light diesel oil is used as fuel. Heat exchange is 3- pass design made of stain less steel. Oil burner is controlled by 2 step thermostat Supply Air Duct Connection Supply air duct connection is provided to supply cool/ hot air into the building. Return Air Duct Connection For recirculation of air during heating, return air duct connection is provided. During heating cycle, fan sucks the air from the building through return air duct. Features Durable/Dependable Construction The SABRO equipments are designed for durability in any climate. The cabinets are constructed of galvanized steel sheets and all panels are chemically treated and then coated with baked polyester powder paint. This process provides high corrosion resistance to ensure long life operation. The whole unit is assembled on heavy gauge rigid base frames. The casing is internally provided with insulation to minimize heat losses. The access doors with hinges are provided where necessary. The top cover is designed with slope for the slide of snow and rain water. Evaporative Cooler The evaporative cooler cools the air by evaporation. The out door air is drawn through Water saturated pad causing decrease of DB temperature of air while WB temperature remains same. The evaporative cooler consists of following parts and components. Stain less steel water sump. Water distribution pump to pump the water into water header, Water spray header to spray water on evaporative pad, Float valve, it is connected with water supply line and maintain water level L- Bleed of valve, Drain connection, Evaporative pad 85% efficiency, 14

15 Indirect Fired Air Furnace/Heater Sabro indirect fired air heater equipped with stainless steel heat exchanger with fuel oil burner and controls. Heat exchanger is capable to raise the air temperature to 90F; the casing of Furnace is double wall construction with 2 inch insolation.4 inch insulation can be provided on request. The exchanger material option includes SS 304 and SS 321. The high efficiency three passes design provides flexibility in design. The indirect fire heater do not discharge combustion product into process air. Air Dampers The evaporative unit is provided with two dampers. One is out door air damper and second is return air damper. For evaporative cooling operation out door air damper fully opens and return air damper is closed to allow the operation on 100% out door air. For heating operation return air damper opens and out door air damper is closed to allow unit on recirculation of processed air. Out door air damper may also be used for fresh air in take. The blades of damper are air foil shape and made of aluminums alloy. Fans SABRO may provide forward curved or backward inclined centrifugal fan to meet the design requirements. The fans are selected to match the design requirement of air flow, external static pressure and sound level. All fans are provided with totally enclosed fan cooled motors according to NEMA or TEFC standards. The fan and motor assembly is installed on rubber with isolators to minimize vibration transmission. The drive system is designed according to AMCA standards. Filters The evaporative cooling heating unit is provided with two set of aluminum washable filters, one set is provided at out door air inlet it is 2 inches thick and second set is provided at return air it is one inch thick. Other type of filters such as pleated filter, bag filter can be provided on requirements. 15

16 DIRECT EVAPORATING COOLING BASIC CALCULATIONS Saturation Efficiency, SE. This is the percent of wet bulb depression (WBD) achieved by the cooling process, for example at 100 Fdry bulb and 70 F wet bulb temperature the bulb depression is 30 F. If the actual temperature drop measure at discharge side of media was 73 F it means that saturation efficiency is 90%. This indicates that the air passing through the media has been with water vapors to 90% of its maximum. Cooling efficiency is the same as saturation efficiency and is most often used to define performance level of the media. Design This term is used in many ways to define the performance of an application or specifications. Some common uses are as follow, IDB = In door dry bulb temperature, ODB = Out door dry bulb temperature, IWB = In door wet bulb temperature, OWB =Out door wet bulb temperature, EDB = Entering dry bulb temperature, LDB = Leaving dry bulb temperature, EWB = Entering dry bulb temperature, LWB = Leaving dry bulb temperature, This term often used in conjunction with conditions such as climate design conditions. In evaporative cooling climate data is considered to the dry bulb and wet bulb level. Psychrometric chart (refer APPENDIX A) would be required to locate the juncture of dry bulb wet bulb line to find the grains or pound of moisture per pound of dry air or relative humidity. Relative Humidity,RH Expressed in percent. The percent of water vapors in the air compared to the amount of water vapors the air can contain or sustain. (50% RH indicate that the air is 50% saturated with water vapors.) Some Formulas used for Calculation Leaving dry bulb temperature= [ODB-(SE x (ODB-OWB)] Leaving wet bulb temperature=normally considered same as EWB. Wet bulb depression=odb-owb. Evaporation rate= [CFM x WBD x (SE/8700] this is sample method. 16

17 Bleed off rate = Evaporation rate x 0.20 Recirculation water flow rate = 3 times the evaporation (proxy) BTU = CFM x 1.08 x delta T Cooling efficiency % = EDB LDB x 100 EDB- EWB Air flow rate (CFM) = sensible cooling load (BTU) 1.08 (IDB LDB) 17

18 2. Components Details Make of the Unit The unit is made up of heavy gauge GI steel sheet. All parts are degreased and de-rusted and then finished with electrostatic powder paint, ensuring excellent corrosion resistance resulting in long life of the unit. The unit is assembled on rigid base for mounting on suitable foundations. The unit is also provided with access doors for routine and periodic maintenance and services etc. The unit is provided with internally polyurethane insulation to prevent any cooling or heating losses etc. Evaporative Cooler This section is provided with water collecting tank which is made of stainless steel for corrosion elimination. This is also equipped with float valve to maintain the water level. The system is also provided with a heavy duty water circulating pump to spray the water on the cooling pads and a well designed water distributor for optimum efficiency. High efficiency evaporative pads are used for cooling of the air. While designing, we have made sure that access to evaporative pads for maintenance etc. should be very convenient. Damper Section This section is provided with two sets of dampers, one for return air and one for fresh air. Fresh air damper is used for evaporative cooling when system is operating on 100% out door air. Return air damper is used for heating cycle when system is operating on 100% re-circulated air. During cooling cycle, the fresh air damper will be opened and return air damper will be closed. During heating cycle, the fresh air damper will be closed and return air damper will be opened. Both dampers are manually operated, as required to adjust once in a season. Evaporator Fan & Motor The units are provided with forward curved centrifugal fans of double width double inlet type. The fans are statistically and dynamically balanced and mounted on rubber type vibration isolators for noiseless and vibration free operation. Fans shafts are provided with permanent lubricated ball bearings. These fans are belt driven type having V belt drive system. Drive system is having adjustable motor pulley and motor base to adjust +10% of the factory adjusted fan speed. These fans are driven by totally enclosed fan cooled motors having proper insulation & complete protection. 18

19 Air Filter Section To avoid dust entering into the system this unit is equipped with filter section which comprises of 2 thick aluminum washable air filter at inlet of fresh air. This ensures dust free air flow over Evaporative pad and through cross flow heat exchanger, which will increase the efficiency and life of this unit. An additional set of 1 thick aluminum washable air filters is also provided at furnace inlet section for air filtration during heating cycle. Diesel Fired Air Heater Basically it comprises of two basic parts i.e. furnace and Burner. FURNACE: It is a high efficiency cross flow type heat exchanger, made of stainless steel pipes and headers. Flame flows inside the pipes of this heat exchanger, while air flows over the pipes and heated air is then supplied to the space BURNER: An automatically controlled, single stage diesel fired burner, to burn the fuel into the furnace for heating effect. It also includes a fuel pump, solenoid valve, ignition control, photo cell electrodes and oil nozzles etc. Control Panel The control panel of this unit comprises of thermostat for automatic operation during cooling and heating cycle, seasonal change over switch, fan motor starters and other automatic controls of pump and burner etc. 19

20 Diesel Oil Burner(B 20K-2) Description Components 01. Damper motor 14.Electric connection-7pole 02. Air damper 15.Suspension hole 03. Photocell 16. Ignition transformer 04. Scale, nozzle assembly 17. Control box 05. Test nipple 18. Electric connection-4pole 06. Nozzle assembly adjustment 19. Pump 07. Ignition cables 20.Solenoid valve 08. Blast tube 21.Reset button 09. Nozzle 22.Motor 10. Shrouded disc 23.Terminal board 11. Ignition electrodes 24.Fan wheel 12. Pre heater 25.Air intake 13. Nozzle assembly 20

21 3. Safety Devices Circuit Breaker The automatically-operated electrical switch which protects the electrical circuit of the unit from damage caused by overload or short circuit. Magnetic Contactor The magnetic contactor can stand on its own as a power control device, or as part of a starter. It is mainly used for opening and closing of the electrical circuit of unit. Thermal Overload Thermal overload relay prevents the electric motor from drawing too much current and overheating. Thermal overload conditions are the most likely faults to be encountered in industrial motor applications. They result in a rise in the motor running current, which produces an increase in the motor's thermal dissipation and temperature. Overload protection prevents an electric motor from drawing too much current, overheating, and literally burning out. Digital Temperature Controller Digital Temperature Controller Features: This digital thermostat simply turns off the burner when it reaches the maximum specified cut off temperature. This digital thermostat turns on the burner when it reaches the minimum specified temperature 21

22 4. Tech/Design Specifications Diesel Air Furnace: 1 Airflow Rate 5,950 CFM (2.80 m3/s) 2 External Static Pressure 1.0 Wg (250 Pa) 3 Heater Output Capacity 82 KW (280,000 BTU/Hr) 4 Heater Input Capacity 104 KW (355,000 BTU/Hr) 5 Heater Efficiency 79% 6 Fuel Type Diesel HSD (8 to 10 Ltr/Hr) 7 Entering Air Temperature 20 C 8 Supply Air Temperature 45 C (Max 100 C) 9 Type of Heat Exchange Cross Flow Stainless Steel 10 Type of Burner Mono Block Type 11 No. of burners One(1) 12 Temperature control Automatic 13 Voltage supply HZ 14 Blow type(air circulator) Forward curved centrifugal 15 Drive type Belt driven 16 Motor(Hp)/power consumption 5hp(3.73 k.w) 17 Air filter type Washable aluminum Evaporative Cooler: 1 Air flow rate 56,00(2.65m3/s) 2 Entering air temperature 35 C DB/24 C WB 3 Efficiency 82% 4 Water circulating pump Provided 5 Filter section Provided 6 Air intake hood Provided Over All Dimensions 1 Height mm(inch) 1219(48) 2 Width mm(inch) 1575(62) 3 Depth mm(inch) 4043(159) 22

23 Technical Data (Oil and Gas Burner) Burner tube Length of burner tube Flange A Flange B Measure B Measure B KV KV Burner tube Output Range and Nozzles Recommended Oil capacity Capacity Mcal/h Angle Recommended type Recommended Nozzle Pump pressure kg/h kw Size Bar KV-2 4,3-10, º S or R Stage Stage The net calorific value of 11, 86 kw/kg for light oil has been used. Recommended Nozzle Because of different boiler types existing on the market, with varying combustion chamber designs, it is not possible to state a definite spray angle or spray pattern. Note that the spray angle and the spray pattern change with the pump pressure. 23

24 5. Design Specs of Evaporative Cooling Media Evaporative Cooler: 1 Air flow rate 56,00(2.65m3/s) 2 Entering air temperature 35 C DB/24 C WB 3 Efficiency 82% 4 Water circulating pump Provided 5 Filter section Provided 6 Air intake hood Provided Fan Performance 6. Elect Data MODEL FAN MOTOR PUMP MOTOR BURNER MOTOR TOTAL UNIT CH 115 RLA FLA RLA FLA RLA FLA RLA FLA MFA

25 7. Parts/Spare Parts(with codes) S# Description Specs SourceUnit Qty Code-no. 1. Fan cross flow with housy ADH 400K OR assy. SYD400K Import no s 1 C HP 3 PHASE 400 Motor(EMERSON) Import no s 1 VAc/1440 C Differential air pressure switch (MILI BAR) Import no s 1 P Diesel burner(two stage)with Complete assembly Import no s 1 accessories and diesel filter (BENTON) P Circuit Breaker 3 Pole 15 Amps Import no s 1 P Circuit Breaker 1 Pole 15 Amps Import no s 1 P a+1b 220v Magnetic contactor green power Import no s 1 P Ft.20(7.5-12A) Thermal Over load Green Power Import no s 1 P National Timer sec Japan Import no s 1 P Digital temperature controller Range 0-400C Import no s 3 C Temperature sensors Head type(pt 100) Import no s 3 P Pump for water spray (sump pump) Local no s 1 P Fuse with holder 5A Local no s 2 P Float valve Tank type Local no s 1 P Filter Aluminum 2 x20 x20 Local no s 1 P N 16. Filter Aluminum 1 x20 x20 Local no s 1 P O 17. Fan belt(saw teeth type) B type Local no s 1 U

26 Catalog Drawing-CH