Secondary Refrigerant definition of Secondary Refrigerant in the Free Online Encyclopedia.

Refrigerant, Secondary

(also secondary coolant), a liquid or gas that is used in refrigerating systems as an intermediate medium for heat transfer from the object to be cooled to the refrigerant, which boils in the evaporator of the refrigerating machine. Systems that operate with secondary refrigerants are used in cases where the direct cooling of an object by means of a boiling refrigerant is impossible, difficult, or uneconomical, for example, when there are many users or when the users are far from the machine room.

Secondary refrigerants should have a low freezing point, a low viscosity, a high specific heat, and a high thermal conductivity. They should be nontoxic, flameproof, and neutral with respect to building materials.

Solutions of salts in water, called refrigeration brines, are used as secondary refrigerants. Sodium chloride brine is employed for temperatures down to – 15°C; magnesium chloride brine, down to – 27°C; and calcium chloride brine, down to – 45°C. Antifreezes and Freons are used in low-temperature refrigerating systems. Aqueous solutions of propylene glycol are employed for temperatures down to – 47°C; aqueous solutions of ethylene glycol, down to – 60°C; Freon-30, down to – 90°C; and Freon-11, down to – 100°C.

Water is used as the secondary coolant in air-conditioning systems.

V. A. GOGOLIN

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No references found	[ILLUSTRATION OMITTED] The Culina system features two AA750 air-cooled Azanechillers with ammonia as primary and glycol as secondary refrigerant. Star's fast track chille solution by Food Trade Review 3% of reading The secondary refrigerant mass flow rate used to produce the subcooling in the main current of refrigerant in the high-pressure line is obtained indirectly from an energetic balance at the subcooler using Equation 1 with the nomenclature of Figure 2. Experimental energetic analysis of the subcooler system in a ... by Torrella, Enrique; Llopis, Rodrigo; Cabello, Ramon; Sanchez, Daniel / HVAC & R Research GREENER PIPING Since the medium-temperature secondary refrigerant (propylene glycol) is not under high pressure like primary refrigerant in a direct expansion system, ABS plastic piping was used in the Williamsburg store. Putting a chill on the energy bill: grocers seek to boost ... by Zimmermann, Kim Ann / Grocery Headquarters	Secondary Measuring Instrument secondary member secondary meristem secondary metabolite secondary metal secondary mineral Secondary Minerals secondary oil recovery secondary optic axis secondary periderm secondary phloem secondary photocurrent secondary plant product secondary plasticizer secondary pollutant secondary porosity secondary port Secondary Quartzite secondary radar secondary radiation secondary rainbow Secondary Raw Material secondary recovery secondary reference fuel secondary reflection Secondary Refrigerant secondary reinforcement secondary rescue facilities secondary reserves secondary root secondary school secondary sewage sludge Secondary Sex Characteristics secondary shaft Secondary Sowing secondary splits secondary standard secondary station secondary storage secondary stratification secondary stratigraphic trap secondary stress secondary structure secondary substation secondary succession secondary surveillance radar secondary target secondary tectonite secondary tide station secondary tissue secondary truss member	Secondary Progressive Multiple Sclerosis secondary proximal renal tubular acidosis Secondary Public Offering Secondary Public Offering Secondary Public Offerings Secondary Pulmonary Artery Hypertension Secondary pulmonary hypertension Secondary Pulsed Field Gel secondary purpura secondary purpura secondary purpura Secondary qualities Secondary Quartzite Secondary quills Secondary radar secondary radar data only secondary radiation secondary radiation secondary radiation secondary radiation Secondary rainbow Secondary rainbow Secondary rainbow Secondary Raw Material Secondary Raw Material secondary recovery Secondary Recovery Server Secondary Reference Cube secondary reference fuel secondary reflection Secondary Refrigerant secondary reinforcement secondary reinforcement secondary relationships Secondary Reparables Secondary Reports Distribution Unit Secondary Request to Send secondary rescue facilities secondary rescue facilities secondary reserves secondary reserves Secondary Restraining System Secondary Restraint System secondary rights secondary road Secondary Road Fund Distribution Advisory Committee Secondary rocks secondary root Secondary roots Secondary Router secondary ruminal contraction secondary ruminal contraction secondary ruminal contraction secondary ruminal contraction Secondary Safety Rating System Secondary Sampling System Secondary Sampling Unit secondary saturation secondary school secondary school secondary school

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[ILLUSTRATION OMITTED] The Culina system features two AA750 air-cooled Azanechillers with ammonia as primary and glycol as secondary refrigerant.

Star's fast track chille solution by Food Trade Review

3% of reading The secondary refrigerant mass flow rate used to produce the subcooling in the main current of refrigerant in the high-pressure line is obtained indirectly from an energetic balance at the subcooler using Equation 1 with the nomenclature of Figure 2.

Experimental energetic analysis of the subcooler system in a ... by Torrella, Enrique; Llopis, Rodrigo; Cabello, Ramon; Sanchez, Daniel / HVAC & R Research

GREENER PIPING Since the medium-temperature secondary refrigerant (propylene glycol) is not under high pressure like primary refrigerant in a direct expansion system, ABS plastic piping was used in the Williamsburg store.

Putting a chill on the energy bill: grocers seek to boost ... by Zimmermann, Kim Ann / Grocery Headquarters

Secondary Measuring Instrument

secondary oil recovery

secondary optic axis

secondary periderm

secondary phloem