Open Refrigeration Fixtures in Supermarkets
Open Refrigeration Fixtures in Supermarkets
(OP)
I would like to hear experiences about taking into account open refrigeration display fixtures in supermarkets.
ASHRAE handbook gives one table which provides net cooling effect of such fixtures.
It is stated assumption, however, that condensers of those fixtures are placed outside cooled room.
In my practice, however, almost all such fixtures have condesing units placed indoor, where they obviously create cooling load, so I am not sure about how to take into account net effect.
ASHRAE handbook gives one table which provides net cooling effect of such fixtures.
It is stated assumption, however, that condensers of those fixtures are placed outside cooled room.
In my practice, however, almost all such fixtures have condesing units placed indoor, where they obviously create cooling load, so I am not sure about how to take into account net effect.





RE: Open Refrigeration Fixtures in Supermarkets
RE: Open Refrigeration Fixtures in Supermarkets
RE: Open Refrigeration Fixtures in Supermarkets
RE: Open Refrigeration Fixtures in Supermarkets
"where they obviously create cooling load"
RE: Open Refrigeration Fixtures in Supermarkets
i am mostly concerned about total net influence of those devices,
MechEngNCPE, there are two things that are dubious in you statement (from my point of view), save unit converstion (I live in SI area btw).
First, one is that you seem to appoaach to this device as it is closed refrigerator, so you take only dissipation, while there are clear cooling effects on room created by open refrigerators, to the extent that ASHRAE recommend adding it to winter heating load, to upsize your heating capacity.
Second, should we not concentrate on condenser dissipation, not simple motor dissipation? We know that differnce is mostly related to EER, so heat by condeser could be 4 times of motor rating.
If I am wrong somewhere, I would appreciate corrections, I feel this thread as some brainstorming session.
RE: Open Refrigeration Fixtures in Supermarkets
i am mostly concerned about total net influence of those devices,
MechEngNCPE, there are two things that are dubious in you statement (from my point of view), save unit conversion (I live in SI area btw).
First, one is that you seem to approach to this device as it is closed refrigerator, so you take only dissipation, while there are clear cooling effects on room created by open refrigerators, to the extent that ASHRAE recommend adding it to winter heating load, to "upsize" your heating capacity.
Second, should we not concentrate on condenser dissipation, not simple motor dissipation? We know that difference is mostly related to EER, so heat by condenser could be 4 times of motor rating.
If I am wrong somewhere, I would appreciate corrections, I feel this thread as some brainstorming session.
RE: Open Refrigeration Fixtures in Supermarkets
RE: Open Refrigeration Fixtures in Supermarkets
RE: Open Refrigeration Fixtures in Supermarkets
There are remote cooled units, where the condensing unit is located outside the store (usually roof), and there will be little to no heat gain to the space (fan).
Now there are a few things to take into account too. If the cooler is closed, it will act very similar to a refrigerator. If the cooler is open, there will be a little cooling to the space. This is because the fan circulates the cool air around the cooler, and does a fairly good job.
Also, unless you have A LOT of coolers, how much added cooling to the space do you expect?
RE: Open Refrigeration Fixtures in Supermarkets