... 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 ... 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 re...
... permit their use elsewhere. Table 10 .2,
based on the tentative temperature differences of 15
K and 12 K
122
Refrigeration and Air- Conditioning
plant will not be operated at its best efficiency. ... 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...
... 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. ... a eutectic solution, and these are frozen down by placing
these elements in the domestic deep-freeze cabinet. Once frozen,
they can be used in picnic baskets, etc., for the short-term s...
... 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 before release to the market.
Other ... and the sheet material skins
may be flat or profiled. When the panels are manufactured the
mixture is injected between the inner and outer skins and expands
to the thickness required...
... (kJ/kg)
24 4
Refrigeration and Air- Conditioning
will take place and the water will draw its latent heat from the air,
reducing the sensible heat and therefore the dry bulb temperature
of the air (Figure 24 .4).
Example ... 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...
... 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 other sources. In the
UK, where ... refrigerant in a cooling system is reversed, the heat
exchanger which was the evaporator becomes the condenser and
vice versa (see Figures 9.4b and 28 .11) and the flow of energy is...