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Hopefully so you dont end up with something like this!

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Presentation on theme: "Hopefully so you dont end up with something like this!"— Presentation transcript:

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2 Hopefully so you dont end up with something like this!

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7 Basic components of a water-water & combo geothermal heat pump system. Tips on proper installation of a hydronic geothermal system Limitations of a hydronic geothermal system Some design considerations of the system Piping options for the load side Control options for the hydronic system

8 Design water temp wont heat space. Insulation generally is the culprit Heat pump is locking out on HP. Waterflow, Waterflow, Waterflow! To much load side antifreeze? Controls, Controls, Controls! High bill complaints. Low loop temps, could be a multitude of reasons! Running system at max 120F temps all season. Design of the system must meet the expectations of the customer, and it is your job to install and verify your system will do the job!

9 What will be my design max water temp? What will be my design min water temp? Will I have a supplemental or backup system? If so, how will it be piped and controlled? What is the heat distribution system? High mass floors - concrete Low mass floors – staple up Radiation – high or low temp Am I doing chilled water for cooling? Do I have areas that need antifreeze? Who is doing the insulation? What is it? What type of floor coverings do I have?

10 Doing an accurate load calculation is priority number 1 including radiant design! This will dictate your supply water temp and flow rates of the system. Knowing the building materials, insulation values, floor coverings, etc. is critical. Jobsite verification of building materials and insulation practices (pictures, pictures) This all goes into a successful installation and a happy customer with low energy costs!

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14 Concrete slab with R-5 edge and horizontal.

15 Concrete slab with R-10 edge and horizontal.

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20 Radiant floor tube spacing at 9 o.c. min. Do not mix more than 25% glycol antifreeze on load side of heat pump (preferably 0%) Flow rate through each radiant floor loop to be between.50gpm and.75gpm Pipe sizing is critical; flow = BTUs Variable Speed pumps & zone valves! Insulation values, floor coverings, flow rates, tube sizes, etc. all factor in to calculating system design!

21 Water-to-Water Heat Pumps Energy obtained from or rejected to a ground-coupled source (closed-loop) Utilized to make domestic hot water Utilized for hot water hydronic systems Utilized for chilled water hydronic systems Optional desuperheaters

22 Energy obtained from or rejected to a ground- coupled source (closed- loop) Utilized for hydronic heating applications (no chilled water ) Utilized to heat or cool air in forced air applications Packaged system Optional Desuperheater

23 Load Side W2W Unit Source Side We are going to focus on the Load Side of the System!

24 ALL heat pump hydronic systems require a buffer tank (well almost ALL). ALL heat pump hydronic systems require a buffer tank (well almost ALL). Decouples floor pumping and unit flow requirements. Decouples floor pumping and unit flow requirements. Usually 1 gallon per 1,000 Btuh Usually 1 gallon per 1,000 Btuh In most cases, controls are the most difficult part of the installation. In most cases, controls are the most difficult part of the installation. Know what youre getting into! Know what youre getting into! Design systems for max. water temps of 120F or less for compressor life and efficiency! Design systems for max. water temps of 120F or less for compressor life and efficiency!

25 V = T x (Qhp – Qload)/Delta T x 500 V = Volume T = Desired minimum run time (minutes) Qhp = HP Capacity Qload = Heat flow to load when HP is on Delta T = Differential set point (10F) Example = 5 x (52, )/10 x 500 = 52

26 The capacity of the heat pump and depending on the control strategy will determine the amount of storage needed. Hot tank – single set point Usually 10 gallons/ton or 1gal/1000btus Demand controlled – single set point Usually 6 gallons/ton or 1gal/1500btus Combo units buffer should be smaller! Example = 5-ton (52MBH + hot tank) 5-tons x 10gal/ton = 50gal or 52,000btu/1000= 52gal

27 Both Source Side and Load Side Coaxial heat exchangers are typically identical Both Source Side and Load Side Coaxial heat exchangers are typically identical Pressure drop ratings are the same Pressure drop ratings are the same Flow rates on the load side should be roughly the same as the source side Flow rates on the load side should be roughly the same as the source side gpm per ton gpm per ton Connection size doesnt always mean pipe size (unit or pump flange) Connection size doesnt always mean pipe size (unit or pump flange)

28 Hydronic radiant systems depend on supplemental heat source: No supplemental heat – up size loop Direct supplemental heat – same as W/A Indirect supplemental heat – up size loop Combo unit systems: 100% radiant – size as you normally would depending on supplemental heat source Some radiant & some F/A – up size loop Hydronic systems will need more loop based on the mass of the system vs. heating air!

29 Ground Source Heat Pumps using R-410a refrigerant typically can only achieve a maximum load side temperature of 120F ELT. This prohibits the use of this technology with other forms or hydronic heating such as radiators and/or sometimes baseboard radiation. There are new low temp baseboard radiators available that will heat at lower than 120F!

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32 With the COP of the HP going up as the load water design temp goes down, outdoor reset makes sense as a recommended control strategy. Outdoor reset control will vary the design load temperature based on outdoor temperature. The colder the outside temp, the warmer the load temp. This maximizes the COP of the system.

33 Water quality is also very important!!!

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35 Pipe size Flow (gpm) Max P.D. (FT/100 FT) Max. Vel (FPS) 1/2" /4" " /4" /2" " /2" " Notes: Use with hot water and chilled water closed piping systems Based on schedule 40 BI or Copper pipe

36 Water-Water Unit Applications Pressurized piping systems Controls Combo Unit Applications Pressurized piping systems Controls

37 Water-Water Heat Pump Buffer Tank (Pressurized or HSS) Load Side Pump Controls (Aquastat) Air Pad Flow Center Pressurized Non-Pressurized Hose kit

38 Tubing Fasteners Manifolds Fittings Zone pumps/Zone Valves Flanges (w/ pumps) Hydronic Accessories Air Eliminator Expansion Tank Controls Zone Control Pump Relay Thermostats

39 Load Side Pump Buffer Tank Aqua-stat GW Unit Zone Pumps Manifolds Tubing PT Ports

40 Load Side Pump Buffer Tank Aqua-stat W2W Unit Flow Center Zone Pumps Manifolds Tubing

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42 115F T1 T2 24V AQUASTAT WITH N/O DRY CONTACTS THAT WILL CLOSE ON FALL IN TEMP! HEATING ONLY CONTROLS! Sensor in tank

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46 Load Side Pump Buffer Tank Aqua-stat W2W Unit Flow Center

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49 Combo Heat Pump Thermostat (Forced Air) Electric auxiliary heater (Optional) Air Pad Buffer Tank (Pressurized or HSS) Load Side Pump Aquastat (hydronic control) Flow Center Pressurized Non-Pressurized Hose kit

50 Tubing Fasteners Manifolds Fittings Zone pumps/Zone Valves Flanges (w/ pumps) Hydronic Accessories Air Eliminator Expansion Tank Controls Zone Control Pump Relay Thermostats

51 Load Side Pump Buffer Tank Aqua-stat GT Unit PT Ports

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54 On Demand Control Strategy!

55 Water-Water Unit Applications Pressurized piping systems HSS non-pressurized piping systems Controls (heating & cooling) HSS System (on demand) HBX Controls (either or, plus Outdoor Reset) Geo-Tech (Don Schuster) (Set point) Terra-Therm Hydronic Controller (Set point) Do it yourself (who knows) Controls (Heating only) HSS HBX Tekmar Johnson Controls Honeywell Ranco

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57 W2W units have lower EERs than Water-Air heat pumps Be careful of sensible cooling capacities of the air handler or water coils – do not size strictly based on tonnage All piping with chilled water needs to be insulated including pumps Buffer tank must be insulated and have an air seal to prevent condensation Advantage – one unit vs. two units

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63 HBX ECO-1000 Wiring Diagram (2stg)

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69 What is the boilers primary function: Back up source only Supplemental heat – same output temp Increase supply temp to provide additional btus to high load areas What source of energy is the backup boiler Gas Electric Wood

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72 Pool & spa heating Domestic water heating Snow melt Process water chilling Ice storage or Ice arenas Waste heat recovery Simultaneously heating & cooling

73 Design the system properly, not using Btus per sqft, but rather good design practices. Insulation is a huge factor along with thermal breaks, if you arent doing it, verify it is done right! Select the proper control strategy for the application, buy off the shelf vs. build your own so anyone can service and troubleshoot! Size your piping and pumps for proper flow. Select your piping strategy for the application as well as the supplemental heat source.

74 Thank You!!!


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