A combination refrigeration system is well suited to may large tonnage air conditioning systems to may large tonnage air conditioning systems where operating economy is important and medium or high pressure steam is planned as the driving force.
However, the combination system is generally most attractive on large tonnage building complexes such as college campuses and industrial processes requiring water at air conditioning temperature levels.
Also, on existing systems where more air conditioning is planned, this increased load can often be added without increasing refrigeration energy requirements by either of the following alternatives:
- If about 1 / 3 more load* is planned, a back pressure steam turbine driven centrifugal refrigeration machine can be added to existing absorption equipment.
- If about 2 / 3 more load* is required, absorption equipment can be added to centrifugal refrigeration equipment.
Normally this entails the substitution of a back pressure turbine for a condensing turbine. As mentioned, medium or high-pressure steam must be planned or be available. This can be self-generated or district heating steam.
The following are some of the features offered by a combination system
- Minimum Energy Requirements – Less heat input is required for a combination system that for a condensing turbine-driven centrifugal or an absorption machine alone. A correct analysis of owning and operating costs uses total system heat input as a criterion rather than a straight steam rate per ton of refrigeration.
- Minimum Heat Rejection – Less heat is rejected from a combination system than from a condensing turbine-driven centrifugal or an absorption machine. Condensation of steam from a back pressure steam turbine in an absorption machine eliminates the need for a more expensive condensing turbine and steam condenser. A lower heat rejection to the cooling tower may permit a smaller size tower to be selected.
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