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Why refrigerant system should use heat reclaim valve
Date:2021-06-02  Click:
In a refrigeration system, heat normally wasted at a condenser can be recovered and serve some other useful purpose.  As a low-to-moderate temperature source, heat reclaim can be used wherever some type of refrigeration system exists.  Properly installed, a heat reclaim system will soon recover the additional costs involved in installing the system.
A well-designed system is more than simply putting another heat reclaim condenser in series or parallel with the normal condenser.
A refrigeration system can supply heat reclaim only when the cooling system is in operation.  Usually, the system is a refrigeration system first, and heat reclaim is a secondary consideration.  The addition of heat reclaim to a system must not handicap the cooling system.
In order to make heat reclaim work properly, control of condensing pressure is a necessity.  Usually, condensing pressure higher than needed for refrigeration only will need to be maintained.  Higher condensing pressure will raise the temperature level to make heat available.  A system without condenser pressure control may operate at condensing temperatures as low as 80°F or less.  This may be adequate for refrigeration, but not high enough for heating anything.  By using regulators to control the condensing pressures to get 110°F, air can now be heated to provide, say, space heating for comfort conditions.
Before adding heat reclaim to an existing refrigeration system or incorporating it in the design of a new system, certain basic requirements must be met.
As mentioned, the system is first and foremost a refrigeration system.  Therefore, heat reclaim will only be available when the cooling system is in operation.  This means there should be a plan to use, or store, the reclaimed heat at the same time the cooling system is in operation.  Adding heat reclaim should not handicap the refrigeration system.  Condensing pressure must not go so high that too much capacity is lost, or the operating cost gets too high.
The system should not operate for heating when cooling is not required.
If the basics can be met, then the details can be addressed.
Discharge temperature, condensing pressure, and compressor compression ratios must be considered, and their affect on operation evaluated.

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