[ DSH ] Control Guide Line - Siam Compressor
Date : 08/04/2011 Revised 1 : 30/08/2013
[ DSH ] Control Guide Line For Heat pump efficiency improvement, Customer can use the advantage of High pressure shell compressor by DSH control. DSH as shown in P-h diagram of Figure 1 can be calculated from Tsat of Pd and Td High pressure shell compressor stores heat inside the compressor. The storage heat can be transfered to a condensing unit by an increase of refrigerant flow to maximize compressor efficiency. Refrigerant flow increasing can be controlled by DSH control concept. As shown in Figure 2
Figure 1 : P-h diagram for SSH and DSH control
SCI Scroll Figure 2 : Storage heat transfer by DSH control
From SCI experiment, DSH control can improvement heat pump efficiency about 5-10%.(As shown in Figure3) Improvement percentage is depend on running condition, refrigerant quatity and heat exchanger size. From SCI experiment, the optimum DSH value has linear relation with Compression ratio value (Pd/Ps) as shown in Figure 4. To apply DSH control, the relation can be programmed into the controller for Electronic expansion valve control. Heat Pump Efficiency Improvement by DSH control
Figure 3 : Heat pump efficiency improvement by DSH Control
Relation of DSH control and Heat Pump Condition
Figure 4 : Optimum DSH value has linear relation with compression ratio value
SCI compressor can be used under a liquid back condition. It will not affected to the compressor reliability. Our compressor limit is - For Scroll compressor : DSH > 10K - For Rotary compressor : DSH > 20K This control can not use with Low pressure shell compressor as liquid refrigerant will mix into compressor oil, reduce lubrication thus affected to the compressor reliability. TDCS11J006
SIAM COMPRESSOR
[ DSH ] Control Guide Line For Heat pump efficiency improvement, Customer can use the advantage of High pressure shell compressor by DSH control. DSH as shown in P-h diagram of Figure 1 can be calculated from Tsat of Pd and Td High pressure shell compressor stores heat inside the compressor. The storage heat can be transfered to a condensing unit by an increase of refrigerant flow to maximize compressor efficiency. Refrigerant flow increasing can be controlled by DSH control concept. As shown in Figure 2
Figure 1 : P-h diagram for SSH and DSH control
SCI Scroll Figure 2 : Storage heat transfer by DSH control
From SCI experiment, DSH control can improvement heat pump efficiency about 5-10%.(As shown in Figure3) Improvement percentage is depend on running condition, refrigerant quatity and heat exchanger size. From SCI experiment, the optimum DSH value has linear relation with Compression ratio value (Pd/Ps) as shown in Figure 4. To apply DSH control, the relation can be programmed into the controller for Electronic expansion valve control. Heat Pump Efficiency Improvement by DSH control
Figure 3 : Heat pump efficiency improvement by DSH Control
Relation of DSH control and Heat Pump Condition
Figure 4 : Optimum DSH value has linear relation with compression ratio value
SCI compressor can be used under a liquid back condition. It will not affected to the compressor reliability. Our compressor limit is - For Scroll compressor : DSH > 10K - For Rotary compressor : DSH > 20K This control can not use with Low pressure shell compressor as liquid refrigerant will mix into compressor oil, reduce lubrication thus affected to the compressor reliability. TDCS11J006
SIAM COMPRESSOR
