Mercury Thermometer Lab Report

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CHAPTER-3 METHODOLOGY 3.1 Location: An audit has been made on VCRS at Dr. Reddy pharmaceutical Private LTD Hyderabad (A.P.). In this plant the compressor in vapour compression refrigeration system compresses the refrigerant. A semi-hermetic screw compressor is provided to ensure high operational efficiency and reliable performance. Capacity control is achieved through slide valve. The compressor is a positive displacement type characterized by two helically grooved rotors, which are manufactured from forged steel. The 50 Hz motor operates at 2975 rpm to directly drive the male rotor, which in turn drives the female rotor on a light film of oil. Refrigeration deals with the transfer of heat from a low temperature level at the heat…show more content…
It consists of a bulb containing mercury attached to a glass tube of narrow diameter, the volume of mercury in the tube is much less than the volume in the bulb. The volume of mercury changes slightly with temperature; the small change in volume drives the narrow mercury column a relatively long way up the tube. The space above the mercury may be filled with nitrogen or it may be at less than atmospheric pressure, a pencil vacuum. In order to calibrate the thermometer, the bulb is made to reach thermal equilibrium with a temperature standard such as an ice/water mixture, and then with another standard such as water/vapor, and the tube is divided into regular intervals between the fixed points. In principle, thermometers made of different material (e.g., colored alcohol thermometers) might be expected to give different intermediate readings due to different expansion properties; in practice the substances used are chosen to have reasonably linear expansion characteristics as a function of true thermodynamic temperature, and so give similar results. Fig3.8 Mercury glass…show more content…
Fig3.9 ultrasonic flow meter 3.4 Observation Observing the periodical detection and maintenance according to the value displayed in the microcomputer control center, the operator can avoid the serious running default. The following detection content and method is a good guide for user. 3.4.1 Daily Running detection 1. Inspect the displayed content of the display screen. 2. If the compressor is in running status, the bearing oil pressure is required to be inspected. The oil level is required to be inspected, and the lubricant is required to be drained or added according to the demand. 3. Inspect the inlet and outlet water pressure and temperature of the condenser so as to compare with those in the design situation. 4. Inspect the leaving and entering temperature of the chilled water and evaporator pressure as to compare with those in the design situation. 5. Inspect the condenser saturation temperature (confirmed according to the condenser pressure detected by the condenser sensor). 6. Inspect the discharge temperature of the compressor. The discharge temperature should be lower than 75 in

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