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Sealed system A refrigerating system in which all refrigerant containing parts are made tight by welding, brazing or a similar permanent connection; it contains no non- permanent connections. Secondary (or indirect) cooling system A system employing a fluid which transfers heat from the product or spaces to be cooled or heated or from another cooling or heating system to the refrigerating system without compression and expansion of the fluid. Semi-hermetic compressor A combination consisting of a compressor and electrical motor, both of which are enclosed in the same housing, having removable covers for access, but having no external shaft or shaft seals, the electrical motor operating in a mixture of oil and refrigerant vapour. Sensible heat It is the amount of heat that causes a change in the temperature of substance without changing its phase. It can be evaluated by means of temperature reading device. Servicing All kinds of work that may be performed by a service technician, from installation, operations, inspection, repair, retrofitting, redesign and decommissioning of refrigeration systems to handling, storage, recovery and recycling of refrigerants, as well as record-keeping. Shut-off device A device to shut off the flow of the fluid, e.g. refrigerant, brine. Soft soldered joint A joint obtained by joining of metal parts with metallic mixtures or alloys which melt below 200 °C. Soldered joint A joint obtained by the joining of metal parts with metallic mixtures or alloys which melt at temperatures in general less than 450 °C Specific heat The quantity of heat needed to raise a unit mass of substance by 1°C. It is measured in joules per Kelvin per kilogram. Strength test pressure The pressure that is applied to test the strength of a refrigerating system or any part of it. Tightness test The pressurisation of a refrigeration system, or any part of it, in order to test for its tightness against leaks. Ton refrigeration (TR) It’s the common used unit for refrigeration or air-conditioning system capacity. It is defined as the rate of energy required to melt a ton of ice at 0 oC in 24 hours. 1 ton of refrigeration (TR) = 3.517 kW = 12,000 Btu/h. Total equivalent warming impact (TEWI) A measure of the overall global-warming impact of equipment based on the total related emissions of greenhouse gases during the lifetime of the equipment, including its manufacture and the disposal of the operating fluids and hardware at the end-of-life. TEWI takes into account both direct emissions, and energy related emissions produced through the energy consumed in operating the equipment. TEWI is measured in units of mass of CO2 equivalent. Transcritical cycle A refrigerating cycle whose compressor discharges refrigerant at a pressure above the critical point. Transitional substance Under the Montreal Protocol, a chemical whose use is permitted as a replacement for ozone depleting substances, but only temporarily because the substance’s ozone depleting potential is non-zero. Ultraviolet radiation (UV) Radiation from the Sun with wavelengths between visible light and X-rays. 149 GlossaryPDF Image | Manual for Refrigeration Servicing Technicians
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