Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Patent
1990-07-17
1991-12-10
Wayner, William E.
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
62201, 62435, F25D 1702
Patent
active
050707043
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to improvements in heating and cooling systems and relates particularly to improvements in air conditioning and chilling systems.
Recent developments in air conditioning systems involve the utilization of modular refrigeration units each having an evaporator and condenser in heat exchange relation with the fluid to be cooled and/or heated. With the modular system, each refrigeration unit is provided with headers for supply and return of the heat exchange fluid. A plurality of refrigeration units are connected in parallel, and the heat exchange fluid circulates through each evaporator and condenser heat exchanger.
The control of such a modular system enables individual refrigeration units to be operated in accordance with the load on the system. Thus, in times of high load, all refrigeration units will be operating to provide maximum heating and/or cooling capacity. When the load is reduced, refrigeration units may be down loaded, or made inoperative, thus reducing the operating costs of the system and resting units which are not required.
BACKGROUND OF THE INVENTION
The modular refrigeration system overcomes a number of disadvantages of previous systems, particularly with regard to system breakdowns and system expansion. The modular system also provide substantial economies in being able to operate only those refrigeration units necessary for the load at any particular time. Power is therefore saved in not having to run refrigeration units which are unnecessary, or in running units at lower than optimum peak operating efficiency.
With a modular heating and/or cooling system, however, the heating and/or cooling heat exchange fluid, which is usually water, passes through the heat exchange fluid manifolds supplying the heat exchange fluid to each of the refrigeration units. The pumping capacity required, therefore, for both heat exchange fluids, i.e., the heat exchange fluid through the evaporators and the condensers of each refrigeration unit, is necessarily that for supplying fluid through all refrigeration units and, preferably, is of greater capacity allowing for expansion of the system both in terms of the number of refrigeration units and/or the load requirements.
BACKGROUND ART
U.S. Pat. No. 2,935,857 to McFarlan discloses an air conditioning system having two separate refrigeration systems each having evaporator-chillers and condensers. The condensers are connected in parallel in the heating water circuit while the evaporators are connected in parallel in the cooling water circuit. Valves are inserted in the water inlets to the evaporators and further valves are inserted in the water inlets to the condensers.
The system is operated through a controller which stops and starts the refrigeration systems. The water valves are also opened and closed by the controller.
Hot water from the condensers and cold water from the evaporators flows to heating/cooling units in each of the various zones of the space to be conditioned. The water is returned through a common return line which flows to the condensers, with any excess passing to a dispersion well. Water is supplied to the water circuits of the evaporators from a separate well.
This system enables one of the two refrigeration systems to operate under light load conditions, the water flow to the evaporator and chiller of the other refrigeration system being shut-off. This produces some economies in operation of the refrigeration system but produces variations in water pressures and, hence, water flow and temperture gradients throughout the system.
It is desirable to provide a heating and cooling system in which water pressure differentials and water flow through the heating and/or cooling system is maintained substantially constant.
It is also desirable to provide an improved heating and/or cooling system for a modular refrigeration system having a multiplicity of refrigeration units in which the flow of heat exchange fluid through the condenser and/or chiller of each unit is dependent on the operating st
REFERENCES:
patent: 4483152 (1984-11-01), Bitondo
patent: 4926649 (1990-05-01), Martinez, Jr.
Multistack Pty. Ltd.
Wayner William E.
LandOfFree
Heating and cooling systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Heating and cooling systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heating and cooling systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1032257