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Exterior view of DHRC (Courtesy of Multistack, West
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approximately 2000 Btu For general calculation purposes, the heat available per ton from the water-cooled chiller would be 14,000 Btu per ton-hour For precise calculation, the actual kilowatts per ton for the chiller should be determined for the operating range of the chiller when heat is being recovered
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Interior view of DHRC (Courtesy of Multistack, West
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325 Instrumenting a Dedicated Heat Recovery Chiller (DHRC) Figure 323 describes the instrumentation of this chiller Since energy is being measured, quality temperature and flow transmitters should be utilized to secure accuracy in the measurements In particular, repeatability should be emphasized so that the operators can depend on these measurements for their operation of the chiller plant
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Advanced Heat Recovery Advanced Heat Recovery 635
To heat recovery t4
Supply chilled water t1
Evaporator
Condenser
DHRC
From heat recovery
t2 f1 From HX Return chilled water
Figure 323 Instumentation for dedicated heat recov-
ery chiller
The flow and temperature measurements are as follows:
Chilled water flow, gal/min Condenser water flow, gal/min Chilled water return temperature F Chilled water supply temperature F Condenser entrance temperature F Condenser leaving temperature F f1 f2 t2 t1 t3 t4
It should be noted that the condenser entrance temperature and flow transmitters are installed before any return water from the cooling tower is mixed with the water from the heat recovery processes 326 Typical Piping for the DHRC Figure 324 provides the typical piping for DHRC; the use of the heat recovery will be shown in other figures The DHRC can be piped in series or parallel with the other chillers Valve V1 can be furnished if there may be a reason for both series and parallel operation Valve V2 provides connection to a cooling tower, heat exchanger or closed-circuit cooler in event that the condenser heat is greater than that needed for the heat recovery processes The pumping requirements for operating the DHRC in parallel with other chillers can vary from no pump needed to one with sizeable
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Advanced Heat Recovery 636 Installing and Operating HVAC Pumps
From chillers To chillers DHRC condenser pumps Chilled water
V1 f1 Evaporator Condenser
Heat recovery C
DHRC
f2 t3 V2 HX
DHRC chilled water pumps t2
To cooling tower or closed circuit cooler
Figure 324 Typical piping for dedicated heat recovery chiller
head; this is determined by the actual configuration of the central chilled water plant Seldom is an open cooling tower connected directly with the DHRC; the heat recovery circuit should be closed through the use of a heat exchanger with a cooling tower or a closed-circuit cooler
327 Heat Recovery Equations The basic equations for heat recovery are quite simple; assuming the specific heat of water to be 10 and the density to be 833 lb/gal, the multiplier for the product of the flow times the temperature difference is 500 So Heat recovered 500 f2 (t4 t3) Btu/h (322)
The simultaneous generation of chilled water in tons is Tons of cooling 5 500 # f1 st2 2 t1d 5 0125 # f1 st2 2 t1d tons 12,000 (323)
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Advanced Heat Recovery Advanced Heat Recovery 637
The total COP for the electric motor driven, heat recovery chiller is a sum of the above two equations in British thermal unit per hour divided by the thermal equivalent of the kW input to the chiller 500 [f2 st4 2 t3d 1 f1 st2 2 t1d] kW # 3412 (324)
Total COP 5
5 0147 [f2 st4 2 t3d 1 f1 st2 2 t1d] Following is actual data derived from a 50-ton DHRC: Chilled water flow f1 100 gal/min; condenser flow f2 56 F; t1 44 F 110 F 130 F; t3
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