| 摘要 |
An air conditioning system and method wherein a central pumping system circulates a heat-exchange liquid (which is water or a glycol solution or other solution called "water") through heating and cooling paths of a refrigeration system and then to and from air-treating units. The fans or blowers of the air-treating units are positioned upstream of the air cooling and heating coils so that the fan heat and pump heat are discharged through the fluid cooler system during cooling load operation, and all of that heat is available for delivery to the air treating units during heating-load operation. The quantity of outside (fresh) air is selected and controlled so that adequate ventilation is provided, and during cold weather so that multi-storey buildings may be provided with adequate pressurization to overcome an objectionable inflow of cold air at ground floor levels at entrances and exits. In the embodiments shown, such additional air is discharged through the fluid cooler to carry away heat during cooling load operation. One embodiment includes a separate line for neutral water to each air treating unit. The neutral water is mixed with either the hot water or the cold water supplied to each air-treating unit for temperature control as distinguished from the standard three-pipe system wherein hot and cold water are mixed to provide temperature control. Another embodiment is a four pipe system having separate supply and return lines for both hot water and cold water. The systems may be designed and operated to utilize the heat pump principle to raise the temperature of the heat-exchange liquid flowing to the fluid cooler above the generally accepted levels. That makes it possible to discharge the heat with a substantially smaller stream of the heat-exchange liquid flowing to the fluid cooler, and thereby reduce the sizes of pumps, motors, piping, and other components of the system. In turn, that: (a) reduces the power consumption so that a smaller amount of fan and pump heat is produced; (b) improves the efficiency of the system; and (c) reduces the amount of heat which must be discharged through the fluid cooler under cooling-load conditions. |
