US3734810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating and cooling system
Assignee: Integrated Dev & Manufacturing Co
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Filing: 1971-06-16
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Granted: 1973-05-22
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Expires: 1991-06-16
Abstract
Abstract A direct expansion type heating and cooling system is provided with means for supplying a heat exchange coil with proportioned mixtures of liquid refrigerant and hot refrigerant gas. Constant temperature is maintained in the conditioned area at any point from full cooling to full heating, by proportioning refrigerant condensate and hot, uncondensed refrigerant gas to the heat exchange coils. Proportioning is attained by modifying the refrigerant condensate expansion valve to move in the direction of closing in response to an increase in uncondensed refrigerant gas flow into the heat exchange coils. The amount of uncondensed refrigerant gas flow into the heat exchange coils is controlled in response to the temperature of the conditioned area. The feed to the heat exchange coils may vary between 100 percent condensate and no uncondensed refrigerant gas, to 100 percent uncondensed refrigerant gas and no condensate. Normally, a mixture of condensate and refrigerant gas is introduced into the evaporator coil. Electric resistance heaters may be used in conjunction with the heat exchange coils to supplement heating and to ''''fine tune'''' temperature controls.
Inventors
- 👤 N Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:34
CPC Classifications
F; F25; F25D; F25D29/00; F25B; F25B41/00; F25B41/20; F25B41/24; F25B2700/00; F25B2700/21; F25B2700/2117; F25B2700/21171; F25B2700/21173
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
176 words
A direct expansion-type heating and cooling system for controlling the temperature within an area including a compressor, a first conduit means connecting the output of said compressor to a condenser, thence to an expansion valve, and thence to a heat exchange coil, the improvement comprising; a second conduit means connecting the output of said compressor to a hot gas regulating valve means thence directly to said heat exchange coil, means for responding to the temperature within said area and adjusting said hot gas regulating valve means to control the rate of flow of hot refrigerant gas to said heat exchange coil in accordance with the temperature level desired, and means associated with said expansion valve for sensing the quantity of hot refrigerant gas supplied to said exchange coil, and structurally associated with said expansion valve to reduce the flow of refrigerant condensate through said expansion valve in response to an increase in hot gas flow, and to increase the flow of refrigerant condensate through said expansion valve in response to a decrease in hot gas flow.
Claim 2
Dependent Claim
176 words
A direct expansion-type heating and cooling system for controlling the temperature within an area including a compressor, a first conduit means connecting the output of said compressor to a condenser, thence to an expansion valve, and thence to a heat exchange coil, the improvement comprising; a second conduit means connecting the output of said compressor to a hot gas regulating valve means thence directly to said heat exchange coil, means for responding to the temperature within said area and adjusting said hot gas regulating valve means to control the rate of flow of hot refrigerant gas to said heat exchange coil in accordance with the temperature level desired, and means associated with said expansion valve for sensing the quantity of hot refrigerant gas supplied to said exchange coil, and structurally associated with said expansion valve to reduce the flow of refrigerant condensate through said expansion valve in response to an increase in hot gas flow, and to increase the flow of refrigerant condensate through said expansion valve in response to a decrease in hot gas flow.
Claim 3
Dependent Claim
57 words
The improved system of claim 1 wherein said first conduit means and said condenser and expansion valve are of a capacity sufficient to conduct substantially the entire output of said compressor therethrough, and said second conduit means and said hot gas regulating valve are of a capacity to conduct substantially the entire output of said compressor therethrough.
Claim 4
Dependent Claim
52 words
The improved system of claim 1 wherein said second conduit means is connected to said compressor outlet upstream of said condensor and is connected to the inlet to said heat exchange coils downstream of said expansion valve, both as sensed in relation to the direction of flow of refrigerant through the system.
Claim 5
Dependent Claim
69 words
The improved system of claim 1 wherein said means associated with said expansion valve for sensing the quantity of hot refrigerant gas supplied to said heat exchange coil comprises pressure equalization means connected to the inlet of said heat exchange coils so that the pressure of hot refrigerant gas introduced thereto will be imposed through said pressure equalization means and transmitted to the control mechanism of said expansion valve.
Claim 6
Dependent Claim
57 words
The improved system of claim 4 wherein said means associated with said expansion valve comprises a pressure equalization line, one end of which is connected to a valve control mechanism so that an increase in the pressure sensed by the equalization line will move the valve control mechanism in a direction tending to close said expansion valve.
Claim 7
Dependent Claim
25 words
The improved system of claim 1 further including electric heating means positioned in series flow relationship with the atmosphere passing over said heat exchange coils.
Claim 8
Dependent Claim
19 words
The improved system of claim 1 further including fan means to pass the atmosphere over said heat exchange coils.
Claim 9
Dependent Claim
36 words
The improved system of claim 1 further including a control circuit comprising temperature sensing means to sense the temperature of the conditioned atmosphere, and means to control said regulating valve in response to the sensed temperature.
Claim 10
Dependent Claim
54 words
The improved system of claim 8 further including electric resistance heaters positioned in series flow with said heat exchange coil with respect to the conditioned atmosphere flow, and means whereby said electric resistance heaters are controlled simultaneously with said hot gas regulating valve in response to the temperature sensed by said temperature sensing means.
Claim 11
Dependent Claim
131 words
In a direct expansion-type heating and cooling system for controlling the temperature within an area including a compressor having its output connected to a first conduit with a condensor and thence a heat exchange coil, the improvement comprising: second conduit means for bypassing said condensor and supplying hot compressed refrigerant gas directly from said compressor to the inlet of said heat exchange coil, regulating valve means in said second conduit means and expansion valve means in said first conduit means, control means for sensing the temperature within the conditioned area and means for adjusting, respectively, said regulating valve and said expansion valve to vary the relative proportions of hot compressed refrigerant gas and refrigerant condensate supplied to said heat exchange coils, in accordance with the temperature level desired in said area.
Claim 12
Dependent Claim
131 words
In a direct expansion-type heating and cooling system for controlling the temperature within an area including a compressor having its output connected to a first conduit with a condensor and thence a heat exchange coil, the improvement comprising: second conduit means for bypassing said condensor and supplying hot compressed refrigerant gas directly from said compressor to the inlet of said heat exchange coil, regulating valve means in said second conduit means and expansion valve means in said first conduit means, control means for sensing the temperature within the conditioned area and means for adjusting, respectively, said regulating valve and said expansion valve to vary the relative proportions of hot compressed refrigerant gas and refrigerant condensate supplied to said heat exchange coils, in accordance with the temperature level desired in said area.
Claim 13
Dependent Claim
42 words
The improvement defined in claim 10 wherein said regulating valve is controlled in response to the temperature sensed in said conditioned area, and said expansion valve is controlled in response to the amount of hot gas flow into said heat exchange coils.
Claim 14
Dependent Claim
28 words
The improved system of claim 11 wherein said control means decrease the flow through said expansion valve in proportion to an increase in flow through said regulating valve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |