CA1048802A - Heat reclaim unit - Google Patents
Heat reclaim unitInfo
- Publication number
- CA1048802A CA1048802A CA76267230A CA267230A CA1048802A CA 1048802 A CA1048802 A CA 1048802A CA 76267230 A CA76267230 A CA 76267230A CA 267230 A CA267230 A CA 267230A CA 1048802 A CA1048802 A CA 1048802A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- bypass
- conduit means
- condenser
- conduit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/027—Condenser control arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Heat reclaiming apparatus for use with a refrigeration system has an inlet pipe for connection to a refrigerator com-pressor and for delivering hot gas discharged from the compressor to a first outlet pipe for connection to an exterior condenser and a second outlet pipe for connection to a heat reclaim con-denser employed to heat a space. The outlet pipes are each pro-vided with a valve operable to discontinue the flow of the hot gas therethrough under the control of a temperature sensing device responsive to the temperature in the heated space, the arrangement being such that the hot gas flow to the heat reclaim condenser is discontinued and diverted to the exterior condenser when the tem-perature of the space reaches a predetermined value. A bypass valve connected between the inlet pipe and the first outlet pipe and provided with a valve controlled by a pressure switch is operable to divert a portion of the hot gas flow from the inlet pipe through the bypass pipe to the exterior condenser when the rate of discharge of the gas by the compressor exceeds that which can be absorbed by the heat reclaim condenser.
Heat reclaiming apparatus for use with a refrigeration system has an inlet pipe for connection to a refrigerator com-pressor and for delivering hot gas discharged from the compressor to a first outlet pipe for connection to an exterior condenser and a second outlet pipe for connection to a heat reclaim con-denser employed to heat a space. The outlet pipes are each pro-vided with a valve operable to discontinue the flow of the hot gas therethrough under the control of a temperature sensing device responsive to the temperature in the heated space, the arrangement being such that the hot gas flow to the heat reclaim condenser is discontinued and diverted to the exterior condenser when the tem-perature of the space reaches a predetermined value. A bypass valve connected between the inlet pipe and the first outlet pipe and provided with a valve controlled by a pressure switch is operable to divert a portion of the hot gas flow from the inlet pipe through the bypass pipe to the exterior condenser when the rate of discharge of the gas by the compressor exceeds that which can be absorbed by the heat reclaim condenser.
Description
10488Q~
The present invention relates to heat reclaiming ap-paratuses for use with refrigeration systems.
At the present time, it is common practice to discharge the hot gas produced by the compressor of a refrigeration system to an exterior condenser. However, such an arrangement has the disadvantage that the heat of the hot gas discharged by the com-pressor is wasted.
If the discharge of hot gas, instead of being supplied to the exterior condenser, is directed to a heat reclaim con-denser or the like for heating a space, then means are requiredfor discontinuing the flow of the hot gas to the heat reclaim condenser when the temperature is the space reaches a predeter-mined value.
However, in addition to means for diverting the flow of hot gas to the outside condenser when the predetermined tem-perature is reached in the space, it has been found in practice that there is a need for an arrangement which will also allow a portion of the gas flow to be directed to the exterior condenser, while some of the hot gas flow is still directed to the reclaim condenser, in order to enable the space to be heated even when the rate of discharge of the hot gas from the compressor exceeds that which can be absorbed by the reclaim condenser.
It is accordingly an object of the present invention to provide a novel and improved heat reclaiming apparatus for use with a refrigeration system which enables all, or only a portion, of a flow of hot gas discharged from a compressor to be reclaimed for heating purposes.
According to the present invention, there is provided use with a refrigeration system having a compressor and first and second condensers, in which the secon~ condenser is a heat reclaim-- 1 -- ~
1~488Q2 ing condenser, heat reclaiming apparatus comprising first conduit means for receiving a flow of hot refrigerant gas from the com-pressor, second and third conduit means connected between the first conduit means and the condensers, respectively, first and second valve means operable to discontinue the gas flow through the second and third conduit means, respectively, temperature sensing means responsive to a predetermined temperature for op-erating the valve means to discontinue the gas flow through the third conduit means and initiate the gas flow through the second conduit means, bypass conduit means connecting the first and second conduit means and bypassing the valve means, a bypass valve means in the bypass conduit means and operable to control flow of the gas through the bypass conduit means, and pressure sensi-tive switch means for opening the said bypass valve means in response to a predetermined pressure in the heat reclaiming condenser.
When this apparatus, which is preferably constructed as a prefabricated unit for ready installation in an existing -~
refrigeration system, is in use, hot gas discharged into the first conduit means from a refrigerator compressor may be directed through the third conduit means to a heat reclaiming condenser.
However, when the temperature sensing means detects that the temperature of a space heated by the heat reclaiming condenser has reached the predetermined temperature, the temperature sensing means responds and causes actuation of the first and second valve means to redirect the hot gas flow from the first conduit means to the third conduit means, which may for example be connected to an exterior condenser.
If, before the predetermined temperature is reached, the flow of the hot gas through the third conduit means exceeds that which can be absorbed by the heat reclaiming condenser, the pressure sensitive switch means is actuated and thereby causes :
1~)488~Z
the bypass valve means to open, thus diverting a portion of the --gas flow from the first conduit means to the second conduit means.
The valve means may be electrically or pneumatically controlled. Preferably, each of the valve means comprises a solenoid valve, the apparatus further comprising rélay means connected between the temperature sensing means and said solenoid valves for controlling the energization of the latter in response to the former, the pressure sensitive switch means being connected in parallel with the relay means between the temperature sensing means and the bypass solenoid valve.
With this arrangement, the apparatu~ may further com-prise a pair of power supply conductors, the relay having a normally open pair of contacts in series with the temperature sensing means and the second solenoid valve across said conductors and a normally closed pair of contacts in series with the tem-perature sensing means and the second solenoid valve across the conductors, and the pressure sensitive switch means and the bypass solenoid being connected in series with one another and in parallel with the normally open contacts and the first solenoid valve.
The invention will be more readily understood from the following description of a preferred embodiment thereof given, by way of example, with reference to the accompanying drawing, which diagrammaticalIy illustrates a prefabricated heat reclaiming assembly for connection to a refrigeration system.
The heat reclaiming assembly illustrated in the drawing has first, second and third conduit means in the form, respective-ly, of an inlet pipe 10, a first outlet pipe 11 and a second outlet pipe 12, the outlet pipes 11 and 12 being connected to the inlet pipe 10 as shown.
First and second solenoid valves Vl and V2 are pro-1~488~2 vided in the outlet pipes 11 and 12, respectively, for controlling flow therethrough.
Bypass conduit means are provided in the form of a pipe 14 for bypassing the valve Vl, the pipe 14 being connected between the inlet pipe 10 and the outlet pipe ll. A bypass solenoid valve V3 is provided in the bypass pipe 14 and is con-trolled by a pressure sensitive switch P.
A pair of power supply conductors 16 and 17 are pro-vided for connection to a suitable source of electrical power, the conductor 17 being connected to a stationary contact of a thermostatically operated switch T, the movable contact of which is connected to a conductor 18 which, as illustrated, is connected through the solenoid S of a relay R to the conductor 16. The supply conductor 17 is also connected to a movable contact of the pressure sensitive switch P, which has its stationary contact connected by a conductor 21 to one terminal of the solenoid of the valve V3, the other terminal which is connected by a conductor :~
22 to the conductor 16.
The relay R has a pair of normally-open contacts Cl and
The present invention relates to heat reclaiming ap-paratuses for use with refrigeration systems.
At the present time, it is common practice to discharge the hot gas produced by the compressor of a refrigeration system to an exterior condenser. However, such an arrangement has the disadvantage that the heat of the hot gas discharged by the com-pressor is wasted.
If the discharge of hot gas, instead of being supplied to the exterior condenser, is directed to a heat reclaim con-denser or the like for heating a space, then means are requiredfor discontinuing the flow of the hot gas to the heat reclaim condenser when the temperature is the space reaches a predeter-mined value.
However, in addition to means for diverting the flow of hot gas to the outside condenser when the predetermined tem-perature is reached in the space, it has been found in practice that there is a need for an arrangement which will also allow a portion of the gas flow to be directed to the exterior condenser, while some of the hot gas flow is still directed to the reclaim condenser, in order to enable the space to be heated even when the rate of discharge of the hot gas from the compressor exceeds that which can be absorbed by the reclaim condenser.
It is accordingly an object of the present invention to provide a novel and improved heat reclaiming apparatus for use with a refrigeration system which enables all, or only a portion, of a flow of hot gas discharged from a compressor to be reclaimed for heating purposes.
According to the present invention, there is provided use with a refrigeration system having a compressor and first and second condensers, in which the secon~ condenser is a heat reclaim-- 1 -- ~
1~488Q2 ing condenser, heat reclaiming apparatus comprising first conduit means for receiving a flow of hot refrigerant gas from the com-pressor, second and third conduit means connected between the first conduit means and the condensers, respectively, first and second valve means operable to discontinue the gas flow through the second and third conduit means, respectively, temperature sensing means responsive to a predetermined temperature for op-erating the valve means to discontinue the gas flow through the third conduit means and initiate the gas flow through the second conduit means, bypass conduit means connecting the first and second conduit means and bypassing the valve means, a bypass valve means in the bypass conduit means and operable to control flow of the gas through the bypass conduit means, and pressure sensi-tive switch means for opening the said bypass valve means in response to a predetermined pressure in the heat reclaiming condenser.
When this apparatus, which is preferably constructed as a prefabricated unit for ready installation in an existing -~
refrigeration system, is in use, hot gas discharged into the first conduit means from a refrigerator compressor may be directed through the third conduit means to a heat reclaiming condenser.
However, when the temperature sensing means detects that the temperature of a space heated by the heat reclaiming condenser has reached the predetermined temperature, the temperature sensing means responds and causes actuation of the first and second valve means to redirect the hot gas flow from the first conduit means to the third conduit means, which may for example be connected to an exterior condenser.
If, before the predetermined temperature is reached, the flow of the hot gas through the third conduit means exceeds that which can be absorbed by the heat reclaiming condenser, the pressure sensitive switch means is actuated and thereby causes :
1~)488~Z
the bypass valve means to open, thus diverting a portion of the --gas flow from the first conduit means to the second conduit means.
The valve means may be electrically or pneumatically controlled. Preferably, each of the valve means comprises a solenoid valve, the apparatus further comprising rélay means connected between the temperature sensing means and said solenoid valves for controlling the energization of the latter in response to the former, the pressure sensitive switch means being connected in parallel with the relay means between the temperature sensing means and the bypass solenoid valve.
With this arrangement, the apparatu~ may further com-prise a pair of power supply conductors, the relay having a normally open pair of contacts in series with the temperature sensing means and the second solenoid valve across said conductors and a normally closed pair of contacts in series with the tem-perature sensing means and the second solenoid valve across the conductors, and the pressure sensitive switch means and the bypass solenoid being connected in series with one another and in parallel with the normally open contacts and the first solenoid valve.
The invention will be more readily understood from the following description of a preferred embodiment thereof given, by way of example, with reference to the accompanying drawing, which diagrammaticalIy illustrates a prefabricated heat reclaiming assembly for connection to a refrigeration system.
The heat reclaiming assembly illustrated in the drawing has first, second and third conduit means in the form, respective-ly, of an inlet pipe 10, a first outlet pipe 11 and a second outlet pipe 12, the outlet pipes 11 and 12 being connected to the inlet pipe 10 as shown.
First and second solenoid valves Vl and V2 are pro-1~488~2 vided in the outlet pipes 11 and 12, respectively, for controlling flow therethrough.
Bypass conduit means are provided in the form of a pipe 14 for bypassing the valve Vl, the pipe 14 being connected between the inlet pipe 10 and the outlet pipe ll. A bypass solenoid valve V3 is provided in the bypass pipe 14 and is con-trolled by a pressure sensitive switch P.
A pair of power supply conductors 16 and 17 are pro-vided for connection to a suitable source of electrical power, the conductor 17 being connected to a stationary contact of a thermostatically operated switch T, the movable contact of which is connected to a conductor 18 which, as illustrated, is connected through the solenoid S of a relay R to the conductor 16. The supply conductor 17 is also connected to a movable contact of the pressure sensitive switch P, which has its stationary contact connected by a conductor 21 to one terminal of the solenoid of the valve V3, the other terminal which is connected by a conductor :~
22 to the conductor 16.
The relay R has a pair of normally-open contacts Cl and
2~ a pair of normally-closed contacts C2.
One terminal of the solenoid of valve Vl is connected in series with the normally-open contacts Cl to the conductor 17, and one terminal of the solenoid of valve V2 is connected in series with the normally-closed contacts C2 to the conductor 17, the other terminals of these solenoids being connected to the conductor 16. The pipes 10, 11 and 12, the valves Vl, V2 and V3, the pressure sensitive switch P and the ~elay R are mounted as a prefabricated assembly or unit on a mounting panel 24 during manufacture of the apparatus, and these components are thus readily transportable as a unit for convenient installation in ~ -., ,. , . .. ~ ~ :
.
and connection to an existing refrig~ration system.
When this unit is installed in the refrigeration system, the inlet pipe 10 is connected to the outlet of a refrigerator compressor (not shown) and the outlet pipes ll and 12 are con-nected, respectively, to the inlets of an exterior condenser and a heat reclaim condenser (not shown).
The heat reclaim condenser iB installed in a space, e.g. a room, for heating the space, and the thermostatically operated switch T is also arranged in the space and is arranged to close, and thereby provide a connection between conductors 17 and 18, when the temperature in the space reaches a predetermined value.
The pressure sensitive switch P is connected to the heat reclaim condenser and is arranged to close when the pressure in the heat reclaim condenser exceeds a predetermined value.
The operation of the above-described apparatus is as follows:-During normal operation of the apparatus, the thermo-statically operated switch T is open and, since the relay solenoid S is therefore de-energized, the contacts Cl remain open and the contacts C2 remain closed. The solenoid of the valve V2 is therefore energized through the contacts Cl and the valve V2 is opened, to discharge heating fluid from the inlet pipe 10 to the heat reclaim condenser for heating the space.
Meanwhile, the valve Vl remains closed and, since the pressure in the heat reclaim condenser has not reached the pre-determined value, the pressure sensitive switch P remains open, thus de-energizing the bypass valve V3.
When the temperature in the space reaches a required value, the thermostatically operated switch T closes, and thus _ 5 _ , . - ,:
10488~2 energizes the solenoid relay S. This closes the contacts Cl, thus energizing and opening the valve Vl, and opens the contacts C2, thus de-energizing and closing the valve V2. Consequently, the flow from the inlet pipe 10 is diverted from the outlet pipe 12 to the outlet pipe 11 for discharge to the exterior condenser.
If, while the temperature sensitive switch T is open, and thus the valve V2 is open to discharge the incoming fluid from the inlet pipe 10 to the heat reclaim condenser, the latter cannot absorb all of the heat supplied thereto, then the pressure in the heat reclaim condenser rises until it reaches the pre-determined value at which it causes the pressure sensitive switch P to close.
The closure of the switch P energizes and thus opens the bypass valve V3, which enables part of the incoming fluid from the inlet pipe 10 to be diverted through the bypass pipe 14 to the outlet pipe 11 and thence to the exterior condenser.
.' ' '
One terminal of the solenoid of valve Vl is connected in series with the normally-open contacts Cl to the conductor 17, and one terminal of the solenoid of valve V2 is connected in series with the normally-closed contacts C2 to the conductor 17, the other terminals of these solenoids being connected to the conductor 16. The pipes 10, 11 and 12, the valves Vl, V2 and V3, the pressure sensitive switch P and the ~elay R are mounted as a prefabricated assembly or unit on a mounting panel 24 during manufacture of the apparatus, and these components are thus readily transportable as a unit for convenient installation in ~ -., ,. , . .. ~ ~ :
.
and connection to an existing refrig~ration system.
When this unit is installed in the refrigeration system, the inlet pipe 10 is connected to the outlet of a refrigerator compressor (not shown) and the outlet pipes ll and 12 are con-nected, respectively, to the inlets of an exterior condenser and a heat reclaim condenser (not shown).
The heat reclaim condenser iB installed in a space, e.g. a room, for heating the space, and the thermostatically operated switch T is also arranged in the space and is arranged to close, and thereby provide a connection between conductors 17 and 18, when the temperature in the space reaches a predetermined value.
The pressure sensitive switch P is connected to the heat reclaim condenser and is arranged to close when the pressure in the heat reclaim condenser exceeds a predetermined value.
The operation of the above-described apparatus is as follows:-During normal operation of the apparatus, the thermo-statically operated switch T is open and, since the relay solenoid S is therefore de-energized, the contacts Cl remain open and the contacts C2 remain closed. The solenoid of the valve V2 is therefore energized through the contacts Cl and the valve V2 is opened, to discharge heating fluid from the inlet pipe 10 to the heat reclaim condenser for heating the space.
Meanwhile, the valve Vl remains closed and, since the pressure in the heat reclaim condenser has not reached the pre-determined value, the pressure sensitive switch P remains open, thus de-energizing the bypass valve V3.
When the temperature in the space reaches a required value, the thermostatically operated switch T closes, and thus _ 5 _ , . - ,:
10488~2 energizes the solenoid relay S. This closes the contacts Cl, thus energizing and opening the valve Vl, and opens the contacts C2, thus de-energizing and closing the valve V2. Consequently, the flow from the inlet pipe 10 is diverted from the outlet pipe 12 to the outlet pipe 11 for discharge to the exterior condenser.
If, while the temperature sensitive switch T is open, and thus the valve V2 is open to discharge the incoming fluid from the inlet pipe 10 to the heat reclaim condenser, the latter cannot absorb all of the heat supplied thereto, then the pressure in the heat reclaim condenser rises until it reaches the pre-determined value at which it causes the pressure sensitive switch P to close.
The closure of the switch P energizes and thus opens the bypass valve V3, which enables part of the incoming fluid from the inlet pipe 10 to be diverted through the bypass pipe 14 to the outlet pipe 11 and thence to the exterior condenser.
.' ' '
Claims (10)
1. For use with a refrigeration system having a compressor and first and second condensers, in which the second condenser is a heat reclaiming condenser, heat reclaiming apparatus comprising:
first conduit means for receiving a flow of hot refrigerant gas from the compressor;
second and third conduit means connected between said first conduit means and said condensers, respectively;
first and second valve means operable to discontinue the gas flow through said second and third conduit means, respectively;
temperature sensing means responsive to a predetermined temperature for operating said valve means to discontinue the gas flow through said third conduit means and initiate the gas flow through said second conduit means;
bypass conduit means connecting said first and second con-duit means and bypassing said valve means;
a bypass valve means in said bypass conduit means and oper-able to control flow of the gas through said bypass conduit means; and pressure sensitive switch means for opening the said bypass valve means in response to a predetermined pressure in the heat reclaiming condenser.
first conduit means for receiving a flow of hot refrigerant gas from the compressor;
second and third conduit means connected between said first conduit means and said condensers, respectively;
first and second valve means operable to discontinue the gas flow through said second and third conduit means, respectively;
temperature sensing means responsive to a predetermined temperature for operating said valve means to discontinue the gas flow through said third conduit means and initiate the gas flow through said second conduit means;
bypass conduit means connecting said first and second con-duit means and bypassing said valve means;
a bypass valve means in said bypass conduit means and oper-able to control flow of the gas through said bypass conduit means; and pressure sensitive switch means for opening the said bypass valve means in response to a predetermined pressure in the heat reclaiming condenser.
2. Apparatus as claimed in claim 1, wherein each of said valve means comprises a solenoid valve, said apparatus fur-ther comprising relay means connected between said temperature sensing means and said solenoid valves for controlling the energization of the latter in response to the former, said pressure sensitive switch means being connected in parallel with said relay means between said temperature sensing means and said bypass solenoid valve.
3. Apparatus as claimed in claim 2, further comprising a pair of power supply conductors, said relay having a normally open pair of contacts in series with said temperature sensing means and said second solenoid valve across said conductors and a normally closed pair of contacts in series with said tempera-ture sensing means and said second solenoid valve across said conductors, and said pressure sensitive switch means and said bypass solenoid being connected in series with one another and in parallel with said normally open contacts and said first solenoid valve.
4. Apparatus as claimed in claim 2 or 3, wherein each of said conduit means and said valve means are mounted on a common support for installation as a prefabricated unit.
5. Apparatus as claimed in claim 2 or 3, wherein each of said conduit means, said valve means, said relay means and said pressure sensitive switch means are mounted on a common support for installation as a unit.
6. A refrigeration system, comprising;
first conduit means connected to receive a flow of hot refrigerant gas from a refrigerator compressor;
second and third conduit means connecting first a con-denser and a heat reclaiming condenser, respectively, to said first conduit means for guiding the gas flow through said second and third conduit means;
first and second valve means operable to discontinue the gas flow through said second and third conduit means, respectively;
temperature sensing means responsive to a predetermin-ed temperature of a space heated by said heat reclaiming condenser for operating said valve means to discontinue the gas flow through said third conduit means to said heat reclaiming condenser and initiate the gas flow through said second conduit means to said first condenser;
bypass conduit means connecting said first and second conduit means and bypassing said valve means;
a bypass valve means in said bypass conduit means and operable to control flow of the gas through said bypass conduit means; and pressure sensitive switch means responsive to the gas pressure in said heat reclaiming condenser for controlling the operation of said bypass valve means.
first conduit means connected to receive a flow of hot refrigerant gas from a refrigerator compressor;
second and third conduit means connecting first a con-denser and a heat reclaiming condenser, respectively, to said first conduit means for guiding the gas flow through said second and third conduit means;
first and second valve means operable to discontinue the gas flow through said second and third conduit means, respectively;
temperature sensing means responsive to a predetermin-ed temperature of a space heated by said heat reclaiming condenser for operating said valve means to discontinue the gas flow through said third conduit means to said heat reclaiming condenser and initiate the gas flow through said second conduit means to said first condenser;
bypass conduit means connecting said first and second conduit means and bypassing said valve means;
a bypass valve means in said bypass conduit means and operable to control flow of the gas through said bypass conduit means; and pressure sensitive switch means responsive to the gas pressure in said heat reclaiming condenser for controlling the operation of said bypass valve means.
7. A refrigeration system as claimed in claim 6, where-in each of said valve means comprises a solenoid valve, said sys-tem further comprising relay means connected between said tempera-ture sensing means and said solenoid valves for controlling the energization of the latter in response to the former, said pres-sure sensitive switch means being connected in parallel with said relay means between said temperature sensing means and said bypass solenoid valve.
8. Apparatus as claimed in claim 7, further comprising a pair of power supply conductors, said relay having a normally open pair of contacts in series with said temperature sensing means and said second solenoid valve across said conductors and a normally closed pair of contacts in series with said tempera-ture sensing means and said second solenoid valve across said conductors, and said pressure sensitive switch means and said bypass solenoid being connected in series with one another and in parallel with said normally open contacts and said first solenoid valve.
9. Apparatus as claimed in claim 7 or 8, wherein each of said conduit means and said valve means are mounted on a common support for installation as a prefabricated unit.
10. Apparatus as claimed in claim 7 or 8, wherein each of said conduit means, said valve means, said relay means and said pressure sensitive switch means are mounted on a common support for installation as a unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA76267230A CA1048802A (en) | 1976-12-06 | 1976-12-06 | Heat reclaim unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA76267230A CA1048802A (en) | 1976-12-06 | 1976-12-06 | Heat reclaim unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1048802A true CA1048802A (en) | 1979-02-20 |
Family
ID=4107443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA76267230A Expired CA1048802A (en) | 1976-12-06 | 1976-12-06 | Heat reclaim unit |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1048802A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0058259A1 (en) * | 1981-02-13 | 1982-08-25 | Schneider Metal Manufacturing Company | Energy conserving heat exchange apparatus for refrigerating machines, and refrigerating machine equipped therewith |
-
1976
- 1976-12-06 CA CA76267230A patent/CA1048802A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0058259A1 (en) * | 1981-02-13 | 1982-08-25 | Schneider Metal Manufacturing Company | Energy conserving heat exchange apparatus for refrigerating machines, and refrigerating machine equipped therewith |
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