Energy consumption is the main source of cost pressure in modern hospitals, and air conditioning system accounts for the largest proportion of total energy consumption. In order to save energy and reduce operating costs, modern hospitals have changed from focusing on management to focusing on technology, that is, updating the traditional energy consumption operation system with advanced technology, continuously upgrading and optimizing the structure of the hospital energy consumption system, and improving the overall energy saving level.
To reduce the operation energy consumption of air conditioning system, first of all, an energy-saving and reasonable air conditioning design scheme is needed, which includes the design of air conditioning partition and fresh air volume, etc.; secondly, the management control and system maintenance of air conditioning operation need to be strengthened; in addition, the selection of air conditioning equipment should be considered, and some energy-saving and efficient equipment should be selected as much as possible. The following editor will introduce the energy-saving design scheme of the hospital air conditioning system.
I. design a reasonable and energy-saving air conditioning system
In the design of air conditioning system, the first thing is to choose reasonable indoor design parameters. The design of indoor parameters can not be considered according to the traditional concept, and designers need to have energy-saving awareness. After a project is put into production, it is relatively easy to carry out equipment, installation and other aspects of transformation, but it is not so easy to change the design parameters. Therefore, the design parameters of energy-saving air conditioning are particularly important. The design parameters here mainly include: fresh air ratio, fresh air volume, air change times, indoor temperature and humidity, cold (heat) load per unit area, etc.
1. Select appropriate fresh air ratio
In clean air conditioning, the energy consumption of fresh air treatment accounts for a large part of the energy consumption of the system. Therefore, in the case of meeting the needs of production process and operators, and within the scope allowed by the specification, a low fresh air ratio should be adopted as far as possible. The return air temperature and humidity in the clean space are close to the requirements of the supply air temperature and humidity, and the fresh air should be clean. The purification system that can return air should use more return air as much as possible to improve the return air utilization of the system. The system that cannot return air or uses a small amount of return air should carry out energy recovery.
The determination of the fresh air volume should follow the code for design of clean workshop or the code for design of clean workshop in pharmaceutical industry; for the clean workshop with high degree of airtightness, the fresh air volume should not be too low, otherwise, the indoor staff will easily feel "stuffy".
2. Adopt lower air change times
In the pharmaceutical industry, in the new "drug production quality management specification", there is no corresponding regulation on the air change frequency of each clean level. Designers should not copy the previous "specification" or the so-called design experience, blindly expand the air change frequency, but should closely combine the local atmospheric dust situation and the decoration effect of the project to reasonably determine the air change frequency.
For example, in cities such as the south, the outdoor air dust concentration is low or the decoration standard of engineering projects is high. The indoor dust particles are less and the process itself is more advanced. The clean air conditioning of such projects can appropriately reduce the air change times. The recommended air change times in the code for design of clean workshop can only be used as a reference for design, rather than the regulations that must be followed.
3. Reasonably select indoor temperature and humidity and cooling (heating) load per unit area
The determination of clean room temperature and humidity should be in line with the requirements of production process. In the absence of special requirements, the value of temperature and humidity in the clean room should take the upper limit of the specification as far as possible, and at the same time meet the requirements of human comfort. Due to the uncertainty of many parameters of clean air conditioning, it is relatively difficult to obtain the cooling (heating) load per unit area of clean plant through thermal calculation, which is not accurate in actual operation. Generally, the cooling (heating) load per unit area of a plant is determined based on empirical data.
The main factors considered include: local meteorological conditions, air change times, fresh air ratio, heat transfer characteristics of enclosure structure, heat of process itself, space height, thermal insulation materials, etc.