Heat exchange – With timer – programmer – time delay – or condition responsive... – Having heating and cooling capability
Patent
1994-05-20
1996-11-12
Ford, John K.
Heat exchange
With timer, programmer, time delay, or condition responsive...
Having heating and cooling capability
165 54, 165 59, 165 66, 165909, 16510431, F25B 2900, F24F 1200, F24F 500, F24F 300
Patent
active
055730582
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an air-conditioning installation for room spaces, comprising the room spaces into supply air to be supplied into the room spaces; air; controlling the heat transfer device and the heating and cooling means on the basis of the sensed temperature.
A central air-conditioning installation is used for heating room spaces in the winter and cooling them in the summer by heating or cooling the air supplied into the room space, i.e. the supply air. In addition, the recovery of heat from the air exhausted from the room spaces, i.e. from the exhaust air, and the transfer of the heat into the supply air, have recently become more common.
It is customary to construct separate units for all thermic operations, such as a heat transfer device for the recovery of heat from the exhaust air to the supply air, a heating device for heating the supply air, a cooling device for cooling the supply air, etc. These devices are each provided with separate feed or circulation pipeline systems for the heating or cooling energy, including separate pumps, safety and closing devices, meters, control valves, etc. In addition, a complete adjustment and monitoring equipment is required for each unit.
Accordingly, a great number of different devices are required for the air-conditioning installation, and considerable costs are caused by the acquisition, installation, tuning and maintenance of the devices. The costs of the required thermally insulated energy transfer pipeline systems and adjustment systems are often higher than those of the entire air-conditioning machine. These pipeline systems require plenty of space in the building, which, of course, further increases the costs.
If one wants to utilize not only the energy of the exhaust air but also other low-energy level waste energy, such as condensation heat, still another unit is required, which involves extra costs.
As there are plenty of devices, the energy consumption is easily high. For instance, each heat exchanger causes a pressure loss, which increases the power consumption of the blower of the air-conditioning machine, and each pump consumes power. The costs of the electrification of the air-conditioning machine are high, as each device has to be provided with wiring and contactors, mechanically operated switches, safety devices, etc. As all operating units are separate, there sometimes occurs undesired overlapping of the different operations, such as simultaneous cooling and recovery of heat, which further increases the consumption of energy and costs. Due to the great number of devices, the entity is highly liable to disturbances and is difficult to operate, wherefore the installations rarely operate properly.
The object of the present invention is to provide an air-conditioning installation which avoids the above-mentioned disadvantages and is considerably simpler in structure and more economical. This is achieved by means of an installation according to the invention, which is characterized in that the heating and cooling sources are connected to the heat transfer device so that the preheating, further heating and cooling of the supply air take place through the common heat transfer device.
The invention is based on the idea that the separate units are replaced with a single unit which is used by turns to accomplish the operations previously performed by the required separate units. As only one "multi-purpose" unit is needed, a single energy transfer pipeline system in place of three or four systems, a single pump, a single electric equipment, a single adjustment system, etc., are needed. Pressure losses in the installation are lower, the pumping power is essentially smaller, and the overlapping of the operations is prevented, so that the consumption of energy is substantially lower than in conventional systems. The installation is also less liable to disturbances and substantially easier to use.
In the following the invention will be described in more detail with reference to the attached drawings, in which
FIG. 1 shows a structural diagram of a p
REFERENCES:
patent: 3968833 (1976-07-01), Strindehog et al.
patent: 4061186 (1977-12-01), Ljung
patent: 4084635 (1978-04-01), Marshall
patent: 4142575 (1979-03-01), Glancy
patent: 4182403 (1980-01-01), Margen
ABB Flakt Aktiebolag
Ford John K.
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