Refrigeration and Air Conditioning 3 E Part 1 doc
Refrigeration and Air Conditioning 3 E Part 1 doc
... Maintenance. Service. Fault-finding. Training 33 8
34 Efficiency and economy in operation 35 1
35 Catalogue selection 35 7
Appendix Units of measurement 36 7
References 36 9
Index 37 3
vi
Contents
The refrigeration ... space–temperature
curves would eventually meet and no further heat could be trans-
ferred. The fluid in Example 1. 11 would cool the water down to
3 C. The e...
Refrigeration and Air Conditioning 3 E Part 9 doc
... condenser to re-heat,
together with the energy supplied to the compressor and the fan
motor (since the latter is in the airstream). Figures for this electrical
energy will have to be determined and ... factor is therefore one of wet
bulb rather than dry bulb temperature, and the closer the upper
limits are approached, the less heat can be rejected and so the less
work can be done.
23...
Refrigeration and Air Conditioning 3 E Part 2 potx
... contributes CO
2
emission to the
atmosphere. The choice of refrigerant is therefore about the efficiency
of the refrigerant and the efficiency of the refrigeration system.
The less the amount of energy ... these properties, and meets the new
environmental requirements, but this chapter will show the
developments that are taking place in influencing the selection and
choice of a refri...
Refrigeration and Air Conditioning 3 E Part 3 pptx
... 11 .9 8.29 10 .7 8. 41 9.56 8.48 8.40 8.40
– 35 1. 63 15 .9 9.65 14 .5 9.92 13 . 1 10 .1 11. 9 10 .3
– 30 2.00 20.6 11 .0 19 .1 11. 5 17 .6 11 .6 15 .9 11 .9
Condensers and water towers
69
Hot gas
Main
condenser
water
Liquid
Main
condenser
water
Heat
recovery
circuit
Example ... covered by the provisions of
BS.4 434 :19 80 and require safety pressure relief devices as...
Refrigeration and Air Conditioning 3 E Part 5 ppt
... and shorten
the working life.
11 .11 Site pressure safety tests
Site-erected pipework, once complete, must be pressure tested for
safety and freedom from leaks. Pressures will be 1 .3 times the
11 8
Refrigeration ... 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...
Refrigeration and Air Conditioning 3 E Part 6 pdf
... provide an insulated and refrigerated
enclosure suitable for the handling and storage of perishable goods,
at some predetermined temperature.
The shape and size of the cold store will depend on:
1. ... in Figures
4 .18 and 13 . 2. Other types may have air- cooled or evaporative
condensers, and so require refrigerant pipe connections on site to
these condensers. Sizes range from 1...
Refrigeration and Air Conditioning 3 E Part 7 pps
... plate freezers.
Health and safety requirements continue to become stricter in
the maintenance of the cold chain and the latest regulations should
be adhered to.
17 8
Refrigeration and Air- Conditioning
15 .5 ... hygiene, or the
cheese will be damaged. Some cheeses can be frozen for long-term
storage, but must then be allowed to thaw out gradually and complete
their ripening bef...
Refrigeration and Air Conditioning 3 E Part 8 pot
... the doors, and such figures are based on
observed practice. The parameters are the size of the store, the
enthalpy difference between inside and outside air, and the usage
of the doors. The latter ... their food reserves and then
decaying [29, 33 , 34 ].
Table 21 .3
Product Temperature
(°C)
Heat of respiration
(W/t)
Apples 2 12
Pears 1 16
Bananas 13 48
Strawberries 0 45
Po...
Refrigeration and Air Conditioning 3 E Part 10 pps
... connecting the inner and outer tappings to the ends of the
manometer, the difference will be the velocity pressure.
Figure 27.2
Vertical and inclined manometers
Figure 27 .3
Pitot tube
Sensitive and ... Reduce 900 × 600 – 1 .3 6.62 26 .3 0.04 1. 1 16 0.4 18 6.7
to 500 diameter
6 Fan 500 diameter – 1 .3
7 Enlarge 500 diameter to – 1 .3 3. 61 7.8 0.4 3. 1 34 .1 26 .3
60...
Refrigeration and Air Conditioning 3 E Part 11 pptx
... in the UK
at the present time is where air cooling is required in the summer
and air heating from the same piece of equipment in the winter.
The alternatives will be electric resistance heating, ... plantroom and possible
refrigerant leaks. Steam drives have also been used.
The economics of the heat pump are dependent on the relative
costs of the drive power and heat energy from oth...
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