Vicot Air Conditioning Co., Ltd. CONTENT
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2 CONTENT I. Introduction 2 II. Absorption Principle 3 III. GAX Absorption Cycle 3 IV. Major Component Description and Function 4 V. Features 4 VI. Performance curve 5 VII. Nomenclature 5 VIII. Technical Data 6 IX. Dimensions 7 X. Application 8 XI. Typical Chilled Water Piping 9 AIR COOLED GAS FIRED ABSORPTION CHILLER
3 I. Introduction The Vicot gas fired water chiller is a high efficiency gas fired water chiller for residential and light commercial air conditioning duty. The chiller is designed to be installed outdoors and connected with a chilled water coil located in the indoor air handling system for cooling and dehumidifying the occupied space. Chilled water is produced by an air cooled ammonia water absorption chiller based on the highly efficient generator absorber heat ex changer (GAX) absorption cycle. It can automatically modulate its cooling capacity down to 50% for improved comfort, humidity control and operating efficiency at part load conditions. Natural gas supplies the main energy input to the absorption chiller. A small amount of electrical energy is required to drive the pumps and fans. The thermostat, indoor blower, chilled water coil and piping are to be field supplied.
4 II. Absorption Principle Comparison between conventional and VICOT GAX absorption chiller Conventional Absorption Chiller VICOT GAX Absorption Chiller Figure1 Figure2 III. GAX Absorption Cycle The highly efficient GAX cycle diagram is shown in Figure2 First, note that besides the five major components of the simple cycle, several heat exchangers have been added to attain the high efficiency performance. These include the Generator Absorber Heat Exchanger (GAX), the Adiabatic Section, the Generator Heat Exchanger (GHX), the Rectifier and the Subcooler. The increased efficiency of the GAX cycle is the result of achieving this simultaneous vapor generation and vapor absorption by internal exchange of heat. The vapor that is generated in the generator absorber heat exchanger saves the gas that would otherwise have to be used to generate it in a conventional generator.
5 IV. Major Component Description and Function Generator Heats and Distills Solution to Provide Ammonia Vapor (99.5%) and Weak Solution (4%). SCA/GAX Absorber Provides Suction to Evaporator Using Weak Solution as well as Heat Recovery. Solution Pump Pumps Strong Solution from Low to High Pressure. Condenser Rejects Heat and Provides Condensate. PTXV Provides Expansion of Ammonia and Controls the Refrigeration Effect (High efficiency expansion valve). Evaporator Accepts Heat Input to Liquid and Provides Vapor to Absorber Air Coil Condenser Portion Rejects Heat and Provides Condensate, Absorber Portion Completes Absorption of Ammonia and Rejects Heat. V. Features Patented Technology for First Ever Continuously Variable Speed Operation. Modular design and parallel multi unit connection can realize 5RT~40RT capacity range. 40TR groups can be centralized up to 200TR. Intelligent Controls for Load Matching for Optimal Efficiency. Can Produce Chilled Glycol To Temperatures of 8 C for Ice making. Efficient variable speed motor control technology minimizes electricity consumption and noise. Low NOx burner, Extremely Clean Burning. The true eco friendly air conditioning. Optional heating module for hot water supply in 24 hours. Stable operation in ambient temperature from 20 o C to 55 o C. Non Toxic Corrosion Inhibitor in refrigeration system.
6 VI. Performance curve Figure3 VII. Nomenclature V S A C N 005 A Refrigerant: A: Ammonia B: LiBr Capacity: 005 Single unit cooling capacity is 5RT. Module Number: N=1~8 Function: C: Cooling only Heat rejection type: A: Air cooled W: Water Energy source: S: Solar and Gas G: Gas V: VICOT
7 VIII. Technical Data Vicot Air Conditioning Co., Ltd. Item Cooling Capacity Cooling Adjustment Chilled Water Flow Model VGAC1005A VGAC2005A VGAC3005A VGAC4005A RT KW BTU/Hr BTU/Hr 36000~ ~ ~ ~ m 3 /h Water Pipe In 1 1/4 Gas Pipe In 1/2 Refrigerant Dimension mm 1539*916*1565 Power Supply Power Input MR717 Weight kg NOTE: 1. The test conditions of the unit: Ambient temperature=35 o C; Chilled water inlet =12 o C; chilled water outlet =7 o C 2. Adjust range for the unit is the range of its stepless inverter. 3. For natural gas, the maximum supply pressure to the unit must not exceed 14.0 in.w.c. The minimum gas pressure is 5.0 in.w.c. Higher gas pressures can damage or make inoperative the gas regulator. 2* 1Ph 220V 50Hz 3* 4* KW Weight kg Item Cooling Capacity Cooling Adjustment Chilled Water Flow Model VGAC5005A VGAC6005A VGAC7005A VGAC8005A RT KW BTU/Hr BTU/Hr 36000~ ~ ~ ~ m 3 /h Water Pipe In 1 1/4 Gas Pipe In 1/2 Refrigerant Dimensions Power Supply mm 5* 6* MR717 1Ph 220V 50Hz 7* 8* PowerInput KW
8 IX. Dimensions Figure4 Figure5
9 X. Application The GAX chiller is usually installed in an air conditioning system that consists of chilled water distribution system and thermostat. The GAX chiller is installed in an air conditioning system very much like a conventional electric residential split system, as shown in Figure 5. The air cooled chiller must be located outdoors where it has free access to outdoor air for heat rejection. The chilled water coil is located indoors in the supply air plenum of a central air handler. Chilled water piping connects the GAX chiller with the indoor coil. Figure6
10 XI. Typical Chilled Water Piping Chilled water piping can be PVC, polyethylene, galvanized steel pipe, copper or other materials, depending on the nature of the installation. Typical fittings at the chiller unit are shown in Figure6.It is recommended that a ball valve be installed in ach line for flow adjustment and shut off. Pressure taps are required for adjusting the flow rate as a function of the evaporator water side pressure drop. Figure7
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