PSP-ACC Air Cooled Chiller
PSP-ACC is a universal plug, set, and play control system for air cooled chiller plants for HVAC and refrigeration applications.
PSP-ACC provides comprehensive optimal control to all chillers, chilled water pumps, and condenser(s) or condensing system.
It allows up to eight (8) chillers. Each chiller can have up to eight compressors, which can be any type of (RC) reciprocating compressor with or without unloader, (SC) screw compressors with either step or modulation slide valve, and (CC) centrifugal compressor. Both variable speed and constant speed compressors are allowed.
The chilled water pump system is limited to the primary only system with a maximum of four (4) pumps with or without VFD for standard design. The number of pumps can be extended by a special request.
The condensing systems include central cooling tower with chiller dedicated cooling tower; chiller dedicated air-cooled condenser; and chiller dedicated evaporative cooling tower. The cooling water pump is limited to four (4) for standard cooling water pump systems. The number of cooling water pumps can be increased by a special request.
Users can purchase PSP-ACC from Bes-tech directly and hire local HVAC contractors to install and set up the system. Bes-tech engineer provide on-line assistance for installation and CX is needed.
Bes-tech can provide customers turn-key projects as well. Call for details.
PSP-ACC shall result in substantial electricity cost savings, improve temperature control, enhance system reliability and safety, and extended lifespan for compressor and pump equipment.
- Precision chilled water supply and return temperature control: Control temperature within ±1°F of the setpoint.
- Energy and/or Cost Savings: Reduction in electricity consumption or cost by 25% to 45%.
- Extended Equipment Lifespan: Increased equipment lifespan by over 5 years due to more efficient operation and reduced motor cycling.
- Lower O&M Costs: Reduced operational and maintenance costs by 20% to 50%, primarily from fewer failures of compressor, pump and fans.
- Utility Incentives: Many utilities provide incentives to this technology and controllers. Consult your local utility energy program for details.
- PSP: Plug, set, and play.
- Retrofit existing equipment: No impact on current system operation and no interference with existing equipment.
- New plant: Purchase PSP-ACC as the BAS system.
- Standalone of Integrated operation: Local touch screen for system setup and information graphic viewing; and standard data communication port with any supervisory system or controller.
PSP-ACC leverages AI technologies and solid engineering practices to optimize air cooled chiller plant and sub-zero refrigeration cold water plant systems’ performance. Here are the key principles and advantages:
- Load Projection and Estimation Using AI: AI-based technologies predict future loads by analyzing historical data and real-time variables such as occupancy, weather, and usage patterns.
- Optimal Chilled water Supply and Return Temperature Setpoints: AI identifies the ideal chilled water supply and return temperature target or setpoints to minimize chiller and chilled water pump energy consumption or cost based on the real time load, demand response requirement, and real time pricing.
- Optimal Condensing Pressure Setpoint or Cooling Water Supply and Return Water Temperature Setpoints: AI identifies the ideal condensing pressure setpoint or cooling water supply and return water temperature setpoints to minimize the chiller energy consumption or cost based on the real time load, ambient air conditions (dry bulb and wet bulb), and condenser fan speed.
- Chiller on/off control for maximum efficiency: AI algorithms manage the optimal sequences for turning chillers on or off based on real-time demand to ensure chiller working on the high efficiency zone.
- Chilled Water Temperature Control for Maximum Comfort and High Production Quality: Robust AI assisted PI controls compressor speed (VFD chiller/compressor), modulation slide valve (screw compressor with modulation slide valve), or chiller chilled water valve (reciprocating compressor without VFD chiller, screw compressor with step slide valves without VFD) to ensure accurate chilled water supply temperature control.
- Compressor on/off control for best internal and external pressure balance: AI algorithms leverage external pressure lift to manage the optimal sequences for turning compressors on or off to balance the external and internal pressure lift.
- Pump on/off control for maximum pump efficiency: AI algorithms leverage virtual pump flow meter to manage the optimal sequences for turning pump on or off based on real-time demand to ensure pump working on the high efficiency zone.
- Pump Speed control for minimum loop resistance: AI algorithms leverage virtual pump flow meter to manage control valves at most open positions.
- Fan and Compressor Motor Dual Safety Protection: Motor doctor technology and virtual pressure sensor to protect compressor motor failure or damage due to over current, phase drop out, motor vibration, high and low pressure, and indoor fan and condenser fan failure; and to protect indoor fan motor failure or damage due to over current, phase drop out, and motor vibration. Eliminated conventional pressure sensor failure points and maintenance cost.
- What are some important benefits to Building Owners that install PSP-ACC®?
The PSP-ACC® provides project payback in less than three years. In addition to energy savings, the PSP-ACC® reduces O&M costs significantly and improves system reliability and safety.
- Why do Facility Service Providers/Companies recommend the PSP-ACC®to their clients?
Facility Service Providers/Companies have an obligation to reduce energy consumption annually for their clients and installing PSP-ACC® will ensure satisfaction of this requirement. Moreover, installing the PSP-ACC® will significantly reduce O&M efforts and costs.
- What important facts should ESCOs and Energy Consultants know about the PSP-ACC®?
Air cooled chillers are commonly used in both commercial buildings and data centers. Sub-zero cold water plants are commonly used industrial facilities. This is a significant market for performance contracting and energy retrofits using the PSP-ACC®.
- Why should MEP and BAS Contractors install PSP-ACC®?
Offering PSP-ACC® to their clients can significantly increase revenue without head count increases. It will also increase the chances to renew and/or add new service contracts.
- How is the PSP-ACC® integrated with BAS systems?
The PSP-ACC® is PSP automation system, can be integrated with any BAS system through native Modbus and/or other protocols.
- Does installing the PSP-ACC® void manufacturer warranties?
No!
- Can PSP-ACC® work with stand-alone controllers?
Absolutely!
- Does PSP-ACC® vary the chilled water flow through chillers?
The chilled water flow rate is controlled between 60% to 100% rated flow.
Bes-Tech, Inc. Corporate Office:
6916 N 97th Circle
Bldg B, Suite J, Mailbox 13
Omaha, Nebraska 68122-3037
O: 402-502-2340 I F: 402-502-2283
www.Bes-Tech.net