초록 ▼

A mechanically refrigerated chiller system for a process coolant has a process coolant circuit which includes a coolant reservoir with refrigerant evaporator coils in it. Coolant returns from the process to the reservoir through several and alternate paths. An additional coolant path is provided thr

A mechanically refrigerated chiller system for a process coolant has a process coolant circuit which includes a coolant reservoir with refrigerant evaporator coils in it. Coolant returns from the process to the reservoir through several and alternate paths. An additional coolant path is provided through a heat exchanger. An extra hot-gas line from the high pressure side of the refrigerant compressor is coupled through the heat exchanger to the refrigerant condenser. When the temperature of the coolant is too low, adjustment is made by adding heat to some of the coolant in the heat exchanger. Coolant temperature is sensed in an area where coolant returns from the process through a direct path and in another area where the coolant is leaving the evaporator through the aforementioned heat exchanger are mixed with a portion of the reservoir coolant.

대표청구항 ▼

In a refrigeration system including a refrigerant fluid circuit with a refrigerant compressor, condenser, pressure reducing means, and evaporator in series in the circuit, and where the system further includes a load circuit for conveying a process coolant fluid, the load circuit having a coolant in

In a refrigeration system including a refrigerant fluid circuit with a refrigerant compressor, condenser, pressure reducing means, and evaporator in series in the circuit, and where the system further includes a load circuit for conveying a process coolant fluid, the load circuit having a coolant inlet from a load and a coolant outlet to the load, the improvement comprising: a first heat transfer device in the load circuit; a refrigerant conduit coupled between said compressor and said condenser in parallel with the portion of said refrigerant circuit that is between said compressor and condenser, said conduit having a portion at said heat transfer device and in heat transfer relationship to coolant fluid at said device to transfer heat from refrigerant fluid in said conduit portion to coolant fluid at said heat transfer device; pump means in said load circuit to move the coolant fluid and cause the coolant fluid to flow in said load circuit; said system having a first coolant path through said heat transfer device and a first powered valve in the first coolant fluid path; said evaporator including a reservoir in said load circuit between said coolant inlet and said coolant outlet, said reservoir having said coolant fluid in it; said load circuit further including second and third coolant fluid paths which communicate from said inlet to said reservoir; said heat transfer device and said first powered valve being in said first path, said first powered valve being in a normally-closed condition; said second path including a second powered valve therein and which is in a normally-open condition; said third path being normally open from said inlet to said reservoir.