Refrigeration and air condititioning

... tracks emissions of HFCs and PFCs from equipment through a mass balance analysis Releases of HFCs and PFCs can be calculated based on the inventory (storage not equipment) , purchases and sales of ... reductions of these gases can have a large potential benefit This guidance document addresses HFC and PFC emissions from users of refrigeration and air con...

Ngày tải lên: 08/03/2014, 19:20

... ١٠٢ Department of Mechanical Technology Department Course Title Refrigeration and Air Conditioning Mechanical Technology Major Thermo-Fluid Sciences Principles Code Refrigeration and Air Conditioning ... tube refrigeration 3 - 46 - Department of Mechanical Technology Refrigeration and Air Conditioning - 47 - Department of Mechanical Technology...

Ngày tải lên: 01/04/2014, 00:20

... REFRIGERATION AND AIR CONDITIONING IV (EQUIPMENT COOLING) Subcourse OD1750 Edition A United States Army Combined Arms Support Command Fort Lee, VA 23801-1809 14 ... instruction in refrigeration and air conditioning The scope of this subcourse takes in unit components of the absorption system, including their functions and maintenance; water treatment methods and their...

Ngày tải lên: 27/06/2014, 05:20

... REFRIGERATION AND AIR CONDITIONING IV (EQUIPMENT COOLING) Subcourse OD1750 Edition A United States Army Combined Arms Support Command Fort Lee, VA 23801-1809 14 ... instruction in refrigeration and air conditioning The scope of this subcourse takes in unit components of the absorption system, including their functions and maintenance; water treatment methods and their .....

Ngày tải lên: 27/06/2014, 18:20

... size Transfer of heat through the walls of the evaporator and condenser requires a temperature difference, and the larger these heat exchangers are, the lower will be the temperature differences ... Training 33 8 Efficiency and economy in operation 35 1 Catalogue selection 35 7 Appendix Units of measurement 36 7 References 36 9 Index 37 3 Preface Refrigeration and its applic...

Ngày tải lên: 12/08/2014, 00:20

... flammability and attack by copper This chapter is about the new refrigerants and the new attitude needed in design, maintenance and servicing of refrigeration equipment 3. 2 Ideal properties for a refrigerant ... 16 02 65 – 42 R5 02 Halogen free R717 ammonia R 22, R5 02 R600a isobutane R114 R290 propane R 12, R 22, R5 02 R 127 0 propylene R 12, R 22, R5 02 3. 4 (long-term al...

Ngày tải lên: 12/08/2014, 00:20

... treatment for use in refrigeration condenser circuits, and the merits of different methods need to be assessed before making a choice The reader is referred to specialist works on the subject ... running log (see Chapter 33 ) and the heat exchange surfaces must be kept clean for maximum efficiency – meaning the lowest head pressure and lowest power Air- cooled surfaces may be cleane...

Ngày tải lên: 12/08/2014, 00:20

... the ∆T used is the difference between the evaporating refrigerant and the temperature of the fluid entering the cooler, not the log mean temperature difference (see [1 5] ) In systems where the ... maintenance of water cooling towers and evaporative condensers will permit their use elsewhere Table 10.2, based on the tentative temperature differences of 15 K and 12 K 126 Refrigeration...

Ngày tải lên: 12/08/2014, 00:20

... these elements in the domestic deep-freeze cabinet Once frozen, they can be used in picnic baskets, etc., for the short-term storage of cold foods, wines, ice cream, etc The use of ice cubes to ... consistency and texture, and they require special treatment (see Chapter 17) Once a product has been frozen, it must never be allowed to warm and then be re-cooled, or partial thawing may tak...

Ngày tải lên: 12/08/2014, 00:20

... the slab (see [1 7] ) and the insulation effect of the box or wrapping (Figure 16.2) Thinner pieces of meat can be frozen between refrigerated plates (see Figure 7. 9a) [44] Predicted Experimental ... penetrates The smaller sizes, and the rebated doors, are hand operated Larger doors, especially those to take fork-lift trucks, must be mechanically operated for speed and convenience, a...

Ngày tải lên: 12/08/2014, 00:20

... heat capacity below freezing temperature decrease below freezing Some of these components will be zero if cooling does not take place through the range of temperatures above and below the freezing ... 23. 3 Water Wet bulb Thermometers, dry bulb and wet bulb depression will be less and the reading is termed the screen wet bulb (see Figure 23. 4) It follows that the drier the air, the gr...

Ngày tải lên: 12/08/2014, 00:20