Carrier 50KQL-1PD Application data, Water loop system, Ground water systems, Ground loop systems

Application data

Aquazone™ water source heat pump products are available in a flexible, efficient array of models, which can be used in all types of water loop, ground water, and ground loop type systems. Use Aquazone products to provide optimal energy efficient solutions and adapt to the most challeng- ing design requirements.

AQUAZONE PRODUCT GUIDE

50 SERIES	TYPE	APPLICATION
	SIZE (tons)
50RHC,RVC	Standard	Efficient, compact, low cost
	Efficiency	alternative for retrofit or new
Horizontal/Vertical
	1/2-5	boiler/tower systems.
50RHR,RVR	High	Efficient, adaptable unit for
	Efficiency	new boiler/tower, ground
Horizontal/Vertical
	1/2-5	water, or ground loop systems.
50RHS,RVS	Premium	Premium, ultra efficient unit for
	Efficiency	new boiler/tower, ground
Horizontal/Vertical
	11/4-6	water, or ground loop systems
50HQ,VQ	Large Capacity	Designed to handle large
Horizontal/Vertical	61/2-25	zoned areas for all
		applications.
50KQ	Console	Attractive design for finished
		interior, under-window
	1/2-11/2
		installations.
50RTG	Rooftop	Economical solution for IAQ
		problems and tempering
	3-20
		ventilation air.
		Used to pre-heat or cool
	Water-to-	air and can be used as a
50RWS		stand-alone or supplemental
	Water	boiler/chiller in most hydronic
	3-30	heating applications. Also
		conditions process fluids,
		lubricants and refrigerants.

Water loop system

Water loop (or boiler/tower) system applications typically include a number of units plumbed to a common piping system. For optimal performance, design this system be- tween 2.25 and 3 gpm per ton of cooling capacity. The system is comprised of highly efficient packaged reverse cycle heat pump units interconnected by a water loop. The water circuit serves as both a sink and source for heat ab- sorption and rejection and is designed for entering water temperatures between 60 F and 90 F. Within this temper- ature range, units can heat or cool from the same water source. Transferring heat from warm to cold spaces in the building, whenever they coexist, conserves energy rather than creating new heat.

Refer to the Carrier Water Source Heat Pump Sys- tem Design Guide for assistance designing water loop systems. The guide includes a practical approach for the latest and most current design recommendations including:

•Horizontal, vertical, console, rooftop and water-to- water product applications.

•Ventilation methods and system design including energy recovery.

•Acoustical considerations for different product types.

•Addressing IAQ issues such as condensate removal, humidity control.

•Air distribution design including diffuser selection/ layout and ductwork design.

•Hydronic system design including pipe sizing/layout and boiler/tower sizing.

•Control configurations such as stand alone, DDC, DCV, and VVT®.

•WSHP efficiency/operational cost comparison chart.

•System variations such as a system without a boiler, variable pumping, and VAV for interior use.

Ground water systems

To use Aquazone units in ground water applications, you should specify extended range. This will provide factory- installed coaxial coil insulation to prevent condensate from dripping when entering water temperatures are below 60 F. In addition, the copper coaxial coil installed on the Aquazone units may not be suitable for all water condi- tions. Refer to the Water Conditioning section for proper coaxial coil material selection.

Surface water system — This system is typically located near a lake or pond. In this application, the loop can be submerged in a series of coils beneath the water surface. The number of coils required depends on system load and design. This application requires minimum piping and excavation.

Open loop system — Use this system where ground water is plentiful. In this application, ground water is pumped through supply piping from the well to the build- ing. The water is then pumped back into the ground through a discharge well as it leaves the building. An addi- tional heat exchanger is usually installed between the build- ing water piping system and the ground water piping sys- tem. This design limits piping and excavation.

Aquazone units include a standard TXV and are rated to extremely low temperatures to self-adjust the refrigeration circuit. Therefore, open loop systems do not require water regulating valves. Use a slow opening/closing solenoid valve to conserve water.

Ground loop systems

There are many commonly specified designs for ground loop applications. Typical designs include vertical loops and horizontal loops. In some applications, water is piped from the ground or lake directly to the water source heat pump. This system only requires piping to get the water from the source to the unit.

NOTE: When utilizing Aquazone water source heat pumps in ground loop systems, refer to the design considerations in the ground water system section.

Horizontal ground loop — Use this system when ade- quate space is available and trenching can be easily accom- plished. A series of parallel pipes are laid out in trenches 3 to 6 feet below the ground surface, and then back-filled. Often, multiple pipes are used to maximize each trench’s heat transfer capability. Ground conditions, heating and cooling requirements, and system design determine piping requirements and ground loop field size.

Vertical ground loop — Use this system in vertical bore- hole applications. This design is well suited for retrofit applications when space is limited or where landscaping is already complete and minimum site disruption is desired. The vertical ground loop system contains a single loop of pipe inserted into a hole. The hole is back-filled and grouted after the pipe is inserted. The completed loop is

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