Air-conditioner/refrigerator cooling water circulating system with underground heat dissipating and hot water recovery sub-system
BACKGROUND OF THE INVENTION 
     The present invention relates to air-conditioner/refrigerator cooling water circulating system with underground heat dissipating and hot water recovery sub-system and relates more particularly to such an air-conditioner/refrigerator cooling water circulating system with underground heat dissipating and hot water recovery sub-system which collects cooling water that circulates through the condensing pipes of various air-conditioners or refrigerators in every floor of a high-rise building and dissipates the heat in water underground for further repeated circulation to continuously cool down said condensing pipes. 
     In regular air-conditioners/refrigerators, discharged heat may be dissipated either through the air cooling or the water cooling method. In the air cooling method, heat is directly discharged in the air. However, the cooling method is not suitable for large scale air-conditioners/refrigerators because it consumes too much power, produces a high noise level and has low efficiency in heat dissipation. In order to ensure a high cooling rate, water-cooled air-conditioning systems are commonly used in high-rise buildings. In a water-cooled air-conditioning system, cooling water circulates through the condenser coil to carry heat away. After heat absorption, hot water from the condenser coil is sent to a cooling tower, which is generally mounted on the roof of a building for cooling the water, for further repeated circulation. Because the cooling tower is mounted on the roof of a building, heat dissipating efficiency will decrease during use hot summer season and is affected the performance of the whole system. Further, a conventional water cooled air-conditioning system will also produce loud noise during its operation and discharged hot air may cause secondary pollution. 
     The present invention has been accomplished to avoid the drawbacks mentioned hereinabove. It is therefore the main object of the present invention to provide an air-conditioner/refrigerator cooling water circulating system which dissipates heat underground so as to provide high performance at a low noise level. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 is a drawing illustrating schematically the preferred embodiment of the air-conditioner/refrigerator cooling water circulating system with underground heat dissipating and hot water recovery sub-system of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Turning now to the annexed drawing in greater detail, there is provided a substantially enclosed water supply tank 1 mounted on the roof 100 of a building and comprised of two water chambers separated from each other, namely the upper water chamber 12 and the lower water chamber 11. A water pump 13 and a water supply device 14 are controlled by a water level controller to supply water from the upper water chamber 12 to the lower water chamber 11 when the water level in the lower water chamber 11 is below a fixed lower limit. The upper and lower water chambers 12 and 11 have each a vent hole 121 or 111 at a higher and suitable location for ventilation. The upper water chamber 12 is further connected to a water supply source by a water intake pipe 122. The lower water chamber 11 has a cooling water pipe system 2 attached thereto at one end which cooling water pipe system 2 has a plurality of manifold pipes 21 respectively connected between a plurality of air-conditioners 3 and a recovery pipe system 4. Through the cooling water pipe system 2, cooling water from the lower water chamber 11 of the water supply tank 1 is circulated through the condensing pipes of the air-conditioners 3 to carry heat by flow of water from the air-conditioners to a substantially enclosed water recovery tank 5 through the recovery pipe system 4. The recovery pipe system 4 comprises a plurality of recovery manifold pipes 41 to collect water from the condensing pipes of the air-conditioners 3, which recovery manifold pipes 41 further comprise each a water outlet pipe 42 controlled by a water tap 43. As shown in the annexed drawing, the water recovery tank 5 has a vent hole 51 at a suitable location for ventilation. A supplementary water tank 7 which has a vent hole 71 at a suitable location is provided to receive water collected from the water recovery tank 5 via a cooling coil 6. The cooling coil 6 is a coiled pipe made from corrosion-resisting material and embedded underground, having one end connected to the water recovery tank 5 and the opposite end connected to the supplementary water tank 7. A water raising device 8 is fastened in the supplementary water tank 7 to send water from the supplementary water tank 7 to the lower water chamber 11 of the water supply tank 1. The water raising device comprises a suction pump 82 controlled by a water level controller to automatically pump water from the supplementary water tank 7 to the lower water chamber 11 of the water supply tank 1 through a water outlet pipe 81 for further circulation.