Criteria and parameters

1. be suitable for applications
2. be the correct size duties
3. works as required in combination with other components.

1. Capital costs: it is Obvious that this criterion is important, but it should be noted that the reduction in capital expenditures will almost certainly lead to increased operating costs and carbon emissions.
2. Operating expenses: cost of electricity, as a rule, is the main cost of ownership. Other costs may include other types of fuel, water, spare parts and maintenance and repair works. It is likely that the small additional cost of some goods, especially heat exchangers, will reduce operating costs.
3. Environmental impact: This will be linked to current spending as the main environmental impacts associated with the consumption of electricity. TEWI or life cycle analysis can help you to compare different options.
4. fnstallation time: Setting a new plant can lead to serious disruption of the user in current operations, and the degree of the violation must be defined before starting work. In addition to installing the equipment, as well as related to the work of builders and temporarily disable other services. The use of plant on manufacture of original equipment helps to keep the installation time to a minimum.
5. Performance requirements: Most systems currently operate automatically and users must be aware of the system of management and facilities to run manual control, to the extent possible, in the event of failure of management. Operators must understand the functions of the system. If not, they will not have the confidence to work with him or her, and the plant will not be operated in the best efficiency. In addition, in case of failure, for any reason, they will not be able to put it right.
6. Content: the Most modern equipment, practically does not require service, but the user must be aware of maintaining the required functions (see Chapter 29), and the extent to which the service can be carried out on the spot. Where the service is contracted out preferably to the supplier shall undertake, at least, during the warranty period.
7. Life expectancy: This is typically 15-20 years for refrigeration systems, and, to a lesser degree the small-original equipment. Where necessary in the short term, for example, a limited series or for temporary buildings and structures, rental or used equipment could be considered.